Long-term dynamics of ecosystems in the north of Moscow Region (rationale for creation of the “Crane Country” nature park) Текст научной статьи по специальности «Биологические науки»

ECOSYSTEMS: ECOLOGY AND DYNAMICS, 2020, Vol. 4, No. 1, Pp. 138-169

=——=—— DYNAMICS OF ECOSYSTEMS AND THEIR COMPONENTS -

UDC 502.45; 502.43; 502.48

LONG-TERM DYNAMICS OF ECOSYSTEMS IN THE NORTH OF MOSCOW REGION (RATIONALE FOR CREATION OF THE "CRANE COUNTRY" NATURE PARK)1

© 2020. O.S. Grinchenko*, T.V. Sviridova**, V.V. Kontorshchikov***

*Water Problems Institute of the Russian Academy of Sciences Russia, 119333, Moscow, Gubkina Str., 3. E-mail: [email protected] **A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences Russia, 119071, Moscow, Leninsky Avenue, 33 ***The State Darwin Museum Russia, 117292, Moscow, Vavilova Str., 57

Received February 3, 2020. Revised February 20, 2020. Accepted February 20, 2020

In the XIX-XX centuries in the north part of what is known as Moscow region today, there were large bog massifs, formed in the spot of an ancient ravine for glacial water run-off. Most of Dubnensky massif and the north half of Olkhovsky-Batkovsky one have survived to this day. In the spot of drained bogs there are agricultural lands now, some of which are turning into swamps again and are overgrown with forest. The biodiversity of this territory is very high. Currently, the work is underway to plan a regional nature park "Crane Country", the area of which will cover more than 75 thousand ha.

To explain the reasons for the park creation, the authors of this article studied the dynamics of natural and anthropogenic landscapes as the habitats for rare and background bird species. We collected and analyzed the data on the history of this territory development for the past 100 and more years, such as bogs draining, peat digging, forest utilization and agriculture. In this article, to create a scientific basis for ecological management, we bring up our original researches on the changes of numbers and species composition of birds, in relation to intensity and agriculture management types.

We determined the main factors of possible influence on the numbers of various bird species in the past 40 years, such as reduction of agricultural lands, hay meadows and pastures, secondary bogging, reduction of fertilizers and pesticides usage, cease of peat digging, flooding of lowlands formed in the spots of drawn peatbogs, forest areas growth, increase of ripening and mature coniferous and overmature deciduous forests, area growth of young deciduous forests formed in the spots of abandoned agriculture lands, big areas flooding due to the activities of beavers, increase of average annual air temperature and annual sum of precipitation.

The result of our researches showed that the territory of the future nature park "Crane Country" is a unique natural-anthropogenic territorial complex of Central Russia, with a significant potential for economy (primarily, in the field of agriculture), nature protection and ecological tourism. Keywords: nature park "Crane Country", ecosystems dynamics in the north of Moscow Region, Taldomsky Urban District, "Crane Land" nature reserve. DOI: 10.24411/2542-2006-2020-10055

The north and northwest parts of Moscow Region belong to Upper Volga lowland (fig. 1). Along its southeast border, at the foot of Klin-Dmitrov Ridge, an ancient valley of glacial water run-off can be found (Вагнер, Манучарянц, 2003). It is called Dubna-Yakhroma Lowland (fig. 1). The landscape features of the territory make it stand out from surroundings, with its even relief, geological structure, many bogs and bogged forests, which determine the regime of ground and surface waters,

1 This work was carried out on the subject of the fundamental research of the Water Problems Institute of the Russian Academy of Sciences for 2018-2020 "Modeling and Forecasting of Recovery Processes of Waters and Ecosystems Quality under Various Scenarios of Climate Changes and Anthropogenic Activities" (No. 0147-2018-0002), State Registry No. AAAA-A18-118022090104-8, section 2.6 "Evolution of Land Ecosystems under the Changing Nature Conditions".

and also microclimate, soil and vegetation cover, and animal population (CBagKOBCKHu, 1936).

The area of Dubna-Yakhroma Lowland is more than 600 km . Its northeast part is occupied with Dubna river basin, and the southwest is occupied with the basins of Dubna tributaries, Sestra and Yakhroma Rivers (fig. 1).

Fig. 1. Physiographic schematic map of southern part of Upper Volga Lowland (Журавлиная родина, 2009).

By the middle of the XX century amelioration and peat digging turned the west part of Dubna-Yakhroma Lowland into a peculiar landscape complex, and the former bogs were replaced with flooded peat quarries, rich of aquatic and semi-aquatic plants, meadows, fields, bogged willow beds, secondary black alder and birch-aspen forests. These biotopes smoothly emerge with each other, and due to their similar regional physiographic conditions, they have developed a mosaic, although unified natural-anthropogenic landscape complex, which also includes country settlements and garden partnerships.

The east part of the lowland has not transformed that much, with a significant part of Dubnensky and Olkhovsky-Batkovsky massifs surviving through the years. The drained bogs were turned into

agricultural lands, but at the moment some of them are turning into swamps again and are overgrown with forest. This exact part of Dubna-Yakhroma Lowland together with the adjoining Taldomsky Elevation are the key territories for the regional nature park with the working title "Crane Country", projected in Sergievo-Posadsky and Taldomsky Urban Districts of Moscow Region. Today there are 7 specially protected natural sites, including the "Crane Land" nature reserve. The future park will also cover the areas to the north and south of the Dubna Lowland, which include 4 functioning and 4 projected specially protected natural sites, as well as 2 forestries of scientific interest.

The park will include 10 functioning specially protected natural sites, including their surroundings, which connect the territories by their landscapes, as well as some territories, valuable for preservation of the regional biodiversity and currently devoid of regulated regime of land management and protection. The already existing nature reserves, being of great significance, will become the cores of the park. The planned area in total will cover more than 75 thousand ha (fig. 2).

Preliminary border of the "Crane Country" Nature Park

_ _ _ _ Territory of the natural surroundings of the Nature Park, which is planned for further inspection

Borders of the regions

---------- Borders of the municipal formations

Borders of the specially protected natural sites of regional importance in the territory of the future Park

Borders of the protected zones of the specially protected natural sites in the territory of the Park

207 Numbers of the specially protected natural sites

Fig. 2. Scheme of the supposed borders of the projected nature park "Crane Country" (Схема ..., 2016). Legend. The specially protected natural sites in the park territory: 166 - "Bolshoye and Maloye Tugolyanskoye Lakes and the Adjoining Bog Massif', 169 - "Dubna Left-bank Nature Reserve", 17 - "Zabolotskoye Lake and Its Neighborhood", 175 - "Complex of Humid Forests and Forest Bogs", 176 - "Forests and Bogs of the 108, 109 Quarters of the Veriginsky Forestry", 177 -"Konstantinovsky Black Alder Forest", 179 - "Transitory Bog in the Torgashinsky Forestry and the Adjoining Forests", 204 - "Dubna Breeding Colony of Grey Herons", 206 - "Maklakovsky Nature Reserve", 207 - "Crane Land" nature reserve.

The work is carried out according to the Scheme of Development and Disposition of the Specially Protected Natural Sites in Moscow Region, which was approved by the Moscow Region Government Order on the 11th of February, 2009, No. 106/5 (28th of January, 2019 edition), as part

of the State Program of Moscow Region "Ecology and Environment of Moscow Region" for 20172026, "Development of Materials for Organization of the Specially Protected Natural Site of Regional Significance. Sergievo-Posadsky Urban District and Taldomsky Urban District of Moscow Region" (Постановление ..., 2019).

An intense agricultural development of the east part of the Dubna Lowland, where the future nature park "Crane Country" is being projected at the moment, has started in the 1920s. The riverbeds of Dubna and Sulat were straightened and deepened, the major part of bogs was drained, the bogged forests were cut down, and Zabolotskoye Lake was partially discharged.

The first information on the birds of the projected park territory was found in the second half of the XIX century, however it is very scarce (Варенцов, 1919; Птушенко, Гладков, 1933; Птушенко, Иноземцев, 1968; Михеев, 2018).

By the 1970s the landscapes of the Dubna Lowland and its neighborhood changed. The amount of bogs reduced, the agricultural lands grew, the wide floodplain meadows and peat digging sites appeared. The area of bogged forests decreased due to the draining hydrotechnical amelioration, and the quality increased for some forest massifs.

Landscapes transformation affected many animal and plant species; some of them vanished completely, some became very rare. Some bird species started to use agricultural landscapes. For example, the wide fields in the Dubna Lowland premised the formation of a large migration flock of common cranes that had never previously existed there until the early 1960s (Смирнова, 1997). The first printed mention of the flock was in V.E. Ivanov's notice (1974) about 2 thousand cranes, feeding on the state farm field of the region. Three years later, R.V. Dormidontov (1977) described the flock in detail in the "Okhota i Okhotnichye Khozyaystvo" ("Hunt and Hunting Farm") journal. The first mass census of cranes (Зубакин и др., 1982), the yearly seasonal monitoring of rare species (Зубакин и др., 1986, 1987, 1988), and phenologic observations (Ковалёв, 1991) began in 1979-1980.

Today almost all the bogs of the Dubna Lowland and its neighborhood are part of the state nature reserves, where the draining and peat digging was ceased. The drained and drawn peatbogs are flooded and bogged again (Гринченко и др., 2017).

Despite its partial transformation, the north part of Moscow Region hasn't lost its ecological value. After an expedition of Botanical Garden of M.V. Lomonosov Moscow State University in 1977, the very first state nature reserve was created near Maloye Tugolyanskoye Lake in the north part of Batkovskoye Bog (Sergievo-Posadky District, Moscow Region). Later the reserve area was increased. It was named "Bolshoye and Maloye Tugolyanskoye Lakes and the Adjoining Bog Massif". Two years later, the nature reserve "Crane Land" was created, called after a novel of M.M. Prishvin who lived and worked in this region in the 1920s. By 1992 there were 12 functioning reserves and natural monuments in Taldomsky and Sergievo-Posadsky Districts, as well as 6 more specially protected natural sites.

Every research, project and agreement on the valuable nature territories during those years were carried out by the members of the Nature Protection Squad (Druzhina) of Biological Faculty of Moscow State University.

The aim of this article is to summarize the materials collected on the dynamics of the ecosystems in the north of Moscow Region. All the data will be included into design documentation of the projected nature park. Besides, this data can be used for scientific monitoring and as a basis for development of nature protection management and ecological and educational events in the future park.

Changes of Forests Areas and Stocks in Moscow Region

The abundance of forests in Moscow Region was gradually decreasing throughout the XVIII and XIX centuries, and in the early XX century the extermination of forests finally became threatening.

The intense cutting and following fires during the 1910-1940s resulted in decrease of forest areas to 21%, which is the lowest value in the history of Moscow Region.

The biggest part of the forests in the north part of Moscow Region was lost during the years of the Moscow Canal building. Its constructions required 2.35 million m3 of forest (photo 1; Рукотворный канал, 2019). The cutting on the Eastern Front of WWII was severe as well, because the main objective of the period was to satisfy the needs in wood of defenses and national economy, due to the wood being one of the most important types of strategic raw material (Лесное хозяйство., 1967).

Photo 1. Gate No. 1 and Volzhsky region of hydraulic structures (Town of Dubna, Karmanovo), Volzhskaya Plotina Station in 1933-1934 (Москва-Волга.Ру ..., 2019).

From the 1950s to 1990s the active reforestation took place and the pace of cutting slowed down, increasing the forest cover of Moscow Region to 41% (Цветков, 1957; Лагунов, Гусев, 1990; Конторщиков, Ярошенко, 2008). As at the 1st of January, 2018, the forests of Moscow Region cover about 47.6% of its total area, or 2116.2 thousand hectares (Лесной план ..., 2018). All the forests of the region are the First Category Forests, and are of sanitary-hygienic and recreation usage. Almost half of the forest resources is the prohibited areas along the banks of rivers, lakes and water reservoirs. About 60% of them, or about 1 million hectares, are excluded from the economical use.

The birches prevail in the regional forests. They occupy 40.6% of them and form 36.8% of the total planting sources in the region. Spruce forests occupy 23.5%, pine - 20.2%, aspen and alder -13.1% each.

Other species, such as larch, oak, ash, maple, elm, linden, poplar and willow, can be found on 2.5% of the total territory.

Among the coniferous species, the spruce forests prevail in the region, occupying 53.6% of the total coniferous planting. Pine forests occupy 46.1% and provide 49.5% of coniferous species sources. Larch occupies 0.3% of the area.

Among the hard-wooded broadleaved species of the regional forests, the oak is the prevailing one. The other species occupy only 3.6% (ash - 1.1%, maple - 1.4%, elm and others - 1.1%).

The soft-wooded broadleaved species are represented mostly by birch, aspen, grey and black alder. The birch prevails among them, occupying 74.5% of the soft-wooded broadleaved plantings.

Aspen, grey and black alder occupy 15.9, 4.7 and 3.4% respectively. Other species, such as linden, poplar and willow, occupy only 1.4% of the total soft-wooded broadleaved plantings (Лесной план ..., 2018).

In the past 80 years, the percentage of old forests in Moscow Region has grown due to the forests development and aging on the big cutting sites, fire sites and abandoned lands during the 1910-1940s (more than 25% of total amount of forests) and gradual decrease of clean cuttings areas: 15 thousand hectares per year in the post-war years, 6 thousand ha in the 1980s, less than 2 thousand ha nowadays. While in 1949 mature and overmature forests occupied 9% of forest lands in the region, today the area had grown up to 15.4% (Лесной фонд, 1949, 1999). The increase of old forest percentage is especially noticeable, from 0.8% in 1949 to 3.4% in the 2000s (Конторщиков, Ярошенко, 2008).

Forest Composition in the North of Moscow Region within the Boundaries of the Projected Nature Park "Crane Country"

The total forest cover of Taldomsky Urban District of Moscow Region is 56% of the total district area (Материалы 2016). The total area of forests is 79680 ha, they belong to the spruce-broadleaved forest zone (Лесохозяйственный регламент ..., 2018). The future "Crane Country" nature park includes Saltykovsky-Shchedrinskoye and Khotchenskoye forestries, as well as agricultural forests, their total area is 30 thousand ha. Taldomsky District is the first one by the peat stocks in Moscow Region. Peat deposits are almost ever-present, mostly of low depth and high ash content. "Dubnensky Bog Massif' is the largest deposit, numbered 149 in the Peat Fund of Moscow and Tver Regions. Those peat stocks occupy 304,462 million m3 (Кутузова и др., 2014).

Abundance of peat bogs characterizes the forests and distribution of sphagnum pine and alder forests in particular.

In the territory of Sergievo-Posadsky Urban District the future park includes the Torgoshinsky and partially Konstantonovsky forestries of Sergievo-Posadskoye forestry, as well as agricultural forests, the total area of which is about 30 thousand ha, too. The territory also has many peatbogs, some of which are already drawn and flooded (near Fedortsovo and Torgashino settlements), and some are used for country buildings.

According to the existing plans for forestry zoning of Moscow Region, the territory of the projected nature park "Crane Country" belongs to Taldomsky-Latoshinsky district of coniferous forests and bogs of the Upper Volga Lowland. Forest cover of this area is more than 50% (Лесной план 2008).

There, the spruce and pine forests are prevailing, as well as bogged birch and black alder forests along with grassy and sphagnum bogs. Spruce-pine forests of boreal group occupy various habitats, from the bogged lowlands to the dried watershed areas of the ancient glacial, ancient alluvial plains and morainic islands. The largest areas are occupied with epi-associations of Calamagrostis-blueberry, Calamagrostis-blueberry-green moss and Calamagrostis-blueberry-Oxalis of pine-spruce forests. The pine-spruce forests with fern-horsetail-Oxalis, growing on the slightly wavy and flat ancient alluvial, water-glacial plains, are less common there (Огуреева и др., 1996; Суслова, 2019).

The dune-like elevations, formed with sands, are occupied with pine forests with spruce, with green moss and lingonberry-green-moss; or with pine forests with lichen-green-moss on their tops. The flattened tops of hills and gentle slopes with soils of a more heavy composition are occupied with spruce forests with pine, blueberry and Oxalis.

The lower parts of slopes and the adjoining areas are occupied with spruce forests with pine, blueberry and green moss. The flattened areas with binominal soils (sands, underlied with loams) -with spruce forests with Oxalis and green moss. The most favorable conditions of habitats are preferred by the spruce forests with yellow archangel and Oxalis. The single pine is an evidence of

spruce forests recovery in the spot of former pine forests. Although the century-old pine forests with spruce, blueberry and green moss can also be found there, and the process of pine replacement with spruce is very far from its completion, the tendency for recovery is obvious. While spruce reproduces successfully, especially in the open areas, the secure undergrowth of pines is absent. The still swales are occupied with pine forests with Eriophorum, sphagnum, and moor birch in the second layer. The role of small bushes, such as Andromeda, Labrador tea and bog bilberry, is very significant in those forests; the tussocks are covered with lingonberry and cranberry. The secondary birch and aspen forests are frequent there, too.

The bogged forests of this district can be divided in 2 formations: with grass and with haircap moss. The grassy ones have various types: black alder and black alder-birch forests with reeds, birch and birch-black alder forests with Filipendula, birch and spruce boggy-grassy forests, birch and birch-aspen forests. The haircap moss formation includes spruce, spruce-pine and spruce-birch forests. Their flora is mostly boreal; the spruce forests with oak and linden and corresponding composition of grass cover, are formed only in the habitats with more favorable conditions. Linden and maple can be found only as additive species (Pmchh, 2012).

History of Bogs Transformation in the North of Moscow Region

First amelioration stage (1904-1935). The idea to drain the Dubna bogs came up in 1904, in the Department of Land Improvements of the Ministry of Agriculture and State Property of Russia. The first project for the Dubna River regulation was compiled in 1909, but still needed some revision. The project surveys were conducted until 1915 (CBagKOBCKHH, 1936), then in 1924 they were continued by the sub-department of agricultural amelioration of the Moscow Region Land Department. The regulation activities in the bogged part of Dubna begun in 1925, and in 1928 a walking water excavator "Marion" (photo 2), the only unit existing in the country at the moment, was bought in Great Britain and transferred to the Dubna River.

Photo 2. Cleaning of Dubna riverbed in 1929 with the walking water excavator "Marion" (История мелиорации ..., 2019).

In 1924-1926 the riverbed of Dubna was straightened and the water level lowered by 1.5-ECOSYSTEMS: ECOLOGY AND DYNAMICS, 2020, Vol. 4, No. 1

2 m (Свадковский, 1936). The decrease of the area, affected by the flood during high water, reduction of high water period by one month, increase of fluctuations of groundwater level and peat settling in the bogged spots caused the transformation of vegetation cover (Пчёлкин, 2003).

The black alder forests of floating bogs disappeared on the most of the floodplain territory, but remained near Sulat riverbed only; they were replaced by the more mesophilic black alder forests, which then spread over some bogs with sedge and feather moss and reed bogs. Most of the bogs with sedge and feather moss transformed into mesophilic floodplain meadows, used as the source of hay. Meanwhile, the bogs of near-terraced lowland stayed almost the same.

According to E.G. Svadkovsky (1936), the author of the project for deepening and straightening of Dubna riverbed in 1928-1929, some changes affected the flow parameters during the first years of the project implementation: the average maximal water discharge in spring increased by 24%, the five-percent availability maximum increased almost twice; the duration of flooding decreased by 18%; the low water flow module of five-percent availability decreased by 31%, of seventy-five-percent availability - by 10%; the discharge of summer and autumn floods increased, while their duration decreased (Свадковский, 1936).

The water excavator "Marion" (photo 2) finished its work for the primary Dubna regulation, which had started at Konstantinovo settlement, in November of 1929, and headed back next year, cleaning the Sulat River, its springhead in Zabolotskoye Lake. Those works caused a severe drop of water level in the lake. One of the endemic species of the Ice Age - Cladophora, the reticulated filamentous green algae that forms big globs in the water column, completely disappeared from the lake.

The Dubna River regulation made it possible to harvest hay on every hayfield (13400 ha in total) of its floodplain, the 30% of which had been previously affected by the floods during the summer periods of high water. The decreased groundwater level changed the vegetation cover on the strip of land up to 150 m wide, adjoining the riverbed: the bog plant communities were replaced by the cereals with mixed herbs. The lowered water level of Dubna affected the entire complex of forests and bogs. The amount of hayfields and pastures increased, the state of dirt roads improved, and there was finally an opportunity to work the peat deposits at the riverhead of the Nushpolka River, and exploit forest resources. The Dubna River was also used for timber floating down to Verbilki Station (Свадковский, 1936).

Second amelioration stage (1965-1988). The complex development of the Dubna floodplain began in 1965. About 13.6 ha were ameliorated, 8.1 ha of which were drained with blind drainage, and 5.5 ha - with a channel system (Пчёлкин, 2003). In 1972 the Dubna floodplain was proclaimed one of the most important Komsomol building sites of the country. By 1985 about 19.4 ha were drained, or 9% of all the drained territories of Moscow Region; the ameliorative fund was still about 36.3 thousand ha.

In 1972-1977 an open drainage system of channels was created in the central part of Dubna bog massif, as part of the local "Dubna" project (fig. 3). During its operation the peat settled, leading to decrease of filtration coefficient and formation of enclosed lowlands with stagnant water. In 19871988 the system was reconstructed by deepening of the channels and digging of two arterial channels on the periphery for water intake and discharge to the Dubna River. However, this was not enough for efficient drainage.

During that period, the territory was used for peat digging by milling on the spots with surface deposits, as well as for agricultural growth of herbs.

Productivity of the drained territories remained low. It was a little higher than productivity of the normal areas, and none of the farms managed to reach the projected level of productivity. Soil was in constant need for fertilizer, and large areas tended to turn into bogs. The ameliorative channel system had to be permanently maintained, which required large expenses and could not be paid off by agriculture. Cereal damping caused 30-40% and sometimes even 60% of crop losses. Almost every farm was unprofitable (Продолжая традиции, 1982; От «Мариона» ..., 1977; Мелиорации -высокое качество, 1982; Мелиораторы района, 1985; Резерв в мелиорации, 1986).

Fig. 3. Schematic map with locations of the largest open drainage channel systems in the swamps, on the floodplains and in the bogged forests in the north of Moscow Region during the Second Amelioration Stage (by the late 1970s).

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Third amelioration stage (2004-2019). At this stage the flooding of the disturbed peatbogs began. As it turned out, the drained peatbogs became vulnerable to systematic grass and peat fires, which in its turn revealed a great significance of their prevention for society, nature protection and economy. The fires of 2002 showed there was a severe problems with fire extinguishing, monitoring and prevention (Минаева, Сирин, 2002), including its prevention with flooding (Восстановление ..., 2004).

During that period, some pilot flooding projects were carried out in the Dubna Lowland near "Crane Land" nature reserve (Гринченко, 2002, 2005а, 20056, 2007). Their aim was to reduce the areas of peat fires, create water stocks for quick fire extinguishing and restore swamp ecosystems on the disturbed peatbogs. Throughout the following years, the bigger flooding projects were also executed in Moscow Region, some of which affected territory of the projected nature park "crane Country", too (Гринченко и др., 2017; Каменнова, Минаева, 2018).

Historical and Current Agricultural Nature Management in the North of Moscow Region

The natural richness of resources in the north of Moscow Region is a result of a unique combination of large forest bogs with agricultural lands. The undisturbed bogs and impassable forests are not the only habitats for many rare bird species, many of which, primarily the nesting meadow species, inhabit the agricultural lands as well. Thousands of birds come there every year to feed on the fields and meadows during their migrations (Гринченко и др., 2001; Свиридова и др., 2006; Конторщиков и др., 2014). For economically developed and populous Moscow Region such amounts and species diversity of meadow and field inhabiting birds have become a rare phenomenon, which also confirms the necessity of creation of specially protected nature site - "Crane Country" Nature Park.

The cultivated agricultural lands have many specific features as the nesting and feeding habitats for birds and other animals. One of those features is the yearly change of ecological conditions in the large territories, used for harvesting. The other, the most prevalent one, is the incomplete state of the conditions, important for the needs satisfaction of some species. Thus, favorable conditions for stable nesting can combine with insufficient feeding sources, and vice versa. Plowing, harrowing and early harvesting lead to almost total destruction of eggs and nestlings of the ground-nesting species, and the early and intense grazing cause high rates of destruction as well. Various types of agricultural lands differ in abundance and availability of invertebrates, which many of rare bird species feed on, such as some Charadrii, included into the Red List of Russia and/or Moscow Region: Numenius arquata, Haematopus ostralegus, Limosa limosa, Tringa totanus, Tringa stagnatilis and Gallinago media.

The abrupt reduction of some types of food on agricultural lands is possible at any time (i.e. the reduction of land invertebrates during plowing; of grass insects during mowing or pesticides treatment), if the availability of other types is being increased (i.e. the increasing availability of land and surface vertebrates after mowing and in the grazing zones; of grains spilled and left after harvesting, etc.). The fields with ripening or already harvested cultures also attract some mammals, such as boars. During the years rich with mouse-like rodents, the agricultural lands are feeding source for many foxes and raccoon dogs.

The agricultural pressure is very significant. In the 1980s, for example, some of the lands in the north of Moscow Region were under a severe pasture load. Its decrease in the 1990s immediately caused the population growth of rare nesting species of Charadrii, in the meadows of floodplains (Свиридова, 2008). However, the complete cease of agricultural land use is also adverse for many rare and common bird species of meadows and fields, inhabiting the territory of the projected nature park (Смирнова, 1997; Свиридова и др., 2006, 2016a). The composition and area of the cereal fields are of great importance for birds; the availability and abundance of winter crops determine how much time the migrating common cranes will spend in the projected nature park (Гринченко и др., 2009).

To fully understand the reasons that helped to preserve many rare bird species and maintain the high population of the common ones in the oncoming nature park, the specific researches were carried

out during the past 25 years. They were focused on the history of nature management of the region and the shifts in agricultural landscapes in particular, which took place when the type of their economic use changed. Moreover, the researches allowed to evaluate the current condition of the agricultural lands (Свиридова, 2008; Свиридова и др., 2002; Гринченко и др., 2015; Свиридова и др., 2016а). This article is important for the planning of environmental events which the management of the oncoming nature park will undertake to provide the long-term territorial stability of the yearly fall migration flocks of common crane, as well as to preserve the massifs of perennial meadows which serve as the habitats for many rare species (Свиридова, 2012; Гринченко и др., 2015).

Agricultural Lands During the XVIII-XIX Centuries

Formation of meadow and fields habitats is historically related to development of agricultural activities of people, such as scorching out of trees to create pastures, grazing and mowing. That is why those habitats are dynamic and relatively unstable communities, the very existence of which depends on their agricultural usage (Растительность ..., 1980). The extensive agricultural methods, applied for two millennia, caused a formation of a so-called traditional agricultural landscape, its pasture lands occupying limited areas and alternating with meadows, bogs and forests; its plant and animal communities were close to the natural ones (Тишлер, 1971). In the XVIII-XIX centuries the major part of modern Moscow Region belonged to Kalyzinsky Uyezd (District) of Tver Governorate. Its forest area was very small, about 17-18% (Покровский, 1879) due to the local lands being agriculturally developed. The three-field system was prevalent in farming, as it was prevalent almost everywhere, and fallow lands were usually transformed to pastures. The territory for the future "Crane Country" nature park, was far from the main bread-producing volosts (districts) of Kashinsky and Kalyzinsky Uyezds. In 1774 it still had a lot of big forest areas (fig. 4), and no meadows and tilled fields could be found in the bogged Dubna Lowland until the 1930s. The locals did not have enough agricultural lands, so the grazing and mowing were usually performed right in the sedge bogs. People were poor and had to engage in trade, the most pervasive of which was shoemaking (Кисловский, 1926).

Changes of the Structure of Agricultural Lands as the Habitats of Birds and Other Animals in the XX-XXI Centuries

The biggest part of agricultural lands in the north of Moscow Region was recently occupied with the floodplain bogs and bogged forests. The straightening of the Dubna riverbed in the 1920s

Fig. 4. "Apsaryovo" nature boundary of the "Crane Land" nature reserve in 1774 (piece of Карты дач Генерального межевания ..., 1774). Legend: green - forest, brown -pastures, yellow - meadows, dark grey -villages and other not agricultural lands (Смирнова, 1997).

and the draining during the amelioration of 1960-1980 of large territories on the floodplains and watersheds, made it possible in the second half of the XX century for the agriculture to significantly develop those bogged and waterlogged areas which were almost unusable before (Марков, 1973; Комплексное обследование ..., 1987; Рабочий проект реконструкции ..., 1987).

Generally, the agricultural development of the north of Moscow Region was implemented in the recent 100-130 years in several steps, which were traced in detailed for "Apsaryovo" nature boundary of the "Crane Land" nature reserve (Smirnova et al., 1999; Свиридова и др., 2002).

In the late XIX and early XX centuries there were 10 villages in the boundary. Its northern part was almost entirely covered with forests and heavily bogged; its pastures and meadows occupied a significant part of the territory (about 60%), but existed as numerous small mosaic spots, concentrated around the villages (Smirnova et al., 1999).

After the amelioration of the 1920s and during the collective farms creation, the fields melded and grew bigger (Smirnova et al., 1999), however up to the middle of the XX century the territory remained highly forested and bogged (fig. 5). Its central and western parts kept their mosaic structure of the pastures disposition (fig. 6a).

Fig. 5. Distribution of the afforested and bogged spots of "Apsaryovo" nature boundary in 19561961 (the data obtained by the authors, from the maps of land use).

The most significant ameliorative works in the boundary took place in the 1960-1970s (the laying of the closed underground drainage) and almost completely changed the microrelief of the boundary and adjoining territories, even some villages were razed. The agricultural works of that period included total plowing and meadow reformation. As the result, the further growth of meadows and arable lands smoothed out the mosaic structure of the territory, while the meadows area in the boundary center significantly increased (fig. 6b). However, during the past 30 years, there were no massive ameliorative works in the boundary. All the meadows were sowed again in 1977-1979, in the end of the second stage of amelioration and bogs and bogged lands development.

Legend: 1 - arable lands, 2 - hayfields, 3 - hayfields with partial grazing, 4 -pastures, 5 - forests and all significantly afforested and bushy bogs, abandoned hayfields and forest pastures, 6 - villages, gardens, roads, peatbogs, 7 - open bogged flooded areas.

Legend: 1 - arable lands, 2 - perennial hayfields, 3 - fields with constant crop rotation: 3a - hayfields in the spot of former arable land, 36 - arable land in the spot of former hayfields as at 1999; 4 - pastures: 4a - constant perennial pastures, 46 - mowed perennial pastures, 4b - pastures in the spot of former arable land; 5 - afforested areas, 6 - villages, quarries, peat fields, 7 -bogged flooded areas, 8 - areas overgrowing with bushes.

Fig. 6. Lands structure of "Apsaryovo" nature boundary before 1956-1961 (a) and after 19891999 (b), when the total amelioration and improvement of meadows were done (Свиридова и др., 2002).

The transformations mentioned above led to the increase of mowing and pasture lands in the boundary, from 46% in the late 1950s to 71-76% in 1988-1990 due to the forests area decreasing and some arable lands being used as meadows (fig. 7b). Generally, up to the middle of the 1990s half of the lands of those 3 farms in the territory of "Apsaryovo", were arable (fig. 7a). No less than half of those lands, sometimes even more, was used for cereals growing, which helped with stable forming of the autumn migration flock of common cranes in the north of Moscow Region (Смирнова, 1997; Гринченко и др., 2015). Distribution of arable and meadow lands of "Apsaryovo" in the 1980-1990s differed from the neighboring territories, because the boundary had a lot of meadows (fig. 7). It made the boundary to play an important role of a refigium for rare Charadrii and other meadow birds nesting, included into the Red List of Moscow Region (Красная книга ..., 2018; Свиридова, 2008; Свиридова и др., 2002).

1965 1970 1975 1980 1985 1990 1995 Years ■ Arable lands "Havfields □ Pastures ■ Other

Fig. 7. Agricultural lands structure in "Apsaryovo" nature boundary and its neighboring territories: a) the structure of those 3 farms partially located in the boundary, in total, b) the structure of the boundary lands only, in 1956-1961 and c) in 1990 (Свиридова и др., 2002).

Significantly favorable conditions for the birds and animals inhabiting the boundary were as follows: perennial meadows availability, late grazing and mowing in most of the territory (Свиридова и др., 2002).

The main agricultural development of the other parts of the projected nature park, including the floodplain ones, took place during the same years and by the same plan. The typical appearance of the agricultural lands of the "Crane Land" nature reserve in the 1980s is shown on the photo 3. Generally, the dairy husbandry was prevailing in the north of Moscow Region after the war and

until the first half of the 1990s. After the last large amelioration and meadows improvement, the individual farms began to form, specializing entirely on hay production, which they sold to the other farms to feed the cattle. The crop rotation of cereals and grass was prevailing, although potato and corn was also grown, and big areas were occupied with pastures. However, the correlation between arable lands, hayfields and pastures differed on the various areas of agricultural lands (fig. 8). It was determined by the priorities of the specific farms development and landscape association, e.g. the hayfields and grazing spots prevailed on the floodplain (Свиридова, 2008).

Photo 3. Agricultural lands of the "Crane Land" nature reserve in 1979 (left) and 1982 (right; photos by B.A. Zubakin).

Fig. 8. Correlation between the main types of agricultural lands in the different spots in the north of Moscow Region in the early 1990s (Свиридова, 2008).

Notably, the consequences of the agricultural boundary in the 2000s were significantly evened agricultural land management, when the measures

In the 1990s the agricultural pressure on the lands significantly dropped in the north of Moscow Region. Such a decrease became especially noticeable after 1992, when the country had to abruptly reduce the livestock numbers (almost twice) due to the escalated economic crisis. Therefore, the previously created large areas of grazing lands and hayfields became unwanted (Свиридова, 2008). And before this, the reduction of cereal fields began (Смирнова, 1997). The low agricultural land use from the middle to the end of the 1990s ceased completely in the larger territories in the 2000s (Свиридова и др., 2006; Свиридова и др., 2016а). Among other things, in the past 30 years there were no significant ameliorative activities on the agricultural lands, except for the system of fire water ponds construction and cleanse of the adjoining channels, as part of the program of 2011-2013 for the flooding of disturbed peatbogs. land development cease in "Apsaryovo" nature . It became possible due to the ecological and were taken to preserve the habitats of Charadrii

and common cranes. The measures included recovery of crop rotations of cereals and grass, and increase of cereal fields and moderately used meadows in the nature reserve (Гринченко, 2010; Свиридова и др., 20166). Nonetheless, the changes of the structure and quality of agricultural lands during the changes of the agricultural pressures can be perfectly seen in this particular territory; despite the management, those changes were significant (fig. 9). The production drop led to reduction of the agricultural lands during the 1990-2000s more than by 60%.

Generally, changes of the agricultural lands in the region from 1994 to 2014 were as follows: reduction of developed lands area (especially, of meadows), growth of bogged and afforested areas, structure changes of the exploited agricultural lands as the result of decline (from the middle of the 1990s) and partial recovery (especially, after 2010) of the regional economy (Свиридова и др., 2016а).

The nature and pace of those changes remained stable for the entire period. The first decade characterized with a transition from the low agricultural land development in the second half of the 1990s to its full stop in the middle of the 2000s on the larger areas. At that time, the area of the cereal fields in the region reduced twice times, of the pastures - 14 times; from year to year from 40% to 70% of the meadows remained unused (fig. 9). But many lands were still available for the birds of meadows and fields to nest, due to the thick bushes and trees undergrowth. For the first years after being abandoned, the pastures remained mosaic, with high and low grass, however the abandoned hayfield did not (photo 4; Свиридова и др., 2006).

The second decade of the XXI century was characterized by the growing pace of waterlogging (photo 5) and afforestation of the unexploited agricultural lands. Thus, in "Apsaryovo" nature boundary the area of lands covered with trees and bushes (without taking into consideration 4.5 km of large forest massifs of the boundary) increased from 2 to 9 and 15% in 1994-2004-2014. The area of significantly bogged territories increased from 0.65 to 1.04 and 1.5%; of unmaintained lands, of perennial meadow fallows especially - from 5 to 48 and 63%. The area of hayfields and pastures decreased from 21 ha to 8.4 and 3.1 ha, from 10.1 to 3.2 and 0 ha respectively (fig. 10). The quite similar picture was common for the most of the north of Moscow Region almost up to 2010-2012.

Although the increase of the significantly bogged and afforested areas in "Apsaryovo" nature boundary does not seem to be that high throughout two decades (fig. 10), both of these factors heavily increased the mosaic structure of the lands and changed the agricultural landscapes in general (photo 6).

Fast afforestation of the watersheds in the abandoned agricultural lands, especially in "Apsaryovo" nature boundary, primarily occurs where the deforestation previously took place (fig. 11). The process of afforestation and growth of bushes are uneven, because they depend on a complicated combination of local (relief, hydrological and soil conditions) and regional (weather, climate) factors, as well as the previous history of the territory development. The abrupt growth of trees and bushes was registered during the abnormally humid (2005, 2013) and dry (2006, 2014) season, or right after them. The afforestation was also influenced by the grass fires of the 2000s, which became more frequent in the abandoned agricultural lands. Many areas of the Dubna River floodplain meadows, which had little amounts of shrubs or no shrubs at all in the 1990s, became overgrown with willows and birches after the peat fires (photo 7). The sudden burst of birch recovery in "Apsaryovo" was registered after the fires of 2006 and 2010 (photo 8; Свиридова и др., 2016a).

Not only the areas, but also quality characteristics changed in the spots, occupied with trees and bushes. During the first decade of agricultural decline the scarce willow and birch undergrowth was prevailing in the unmaintained meadows, its height similar to the height of grass cover (photos 9, 10).

Primarily, the over-moistened and bogged meadow lowlands, as well as banks of ameliorative channels, ponds etc., were overgrowing with willows. In the second decade birch, alder and partially pine began to recover in the large areas of meadow fallows far from water courses and over-moistened places. By 2016 many of the meadows overgrown with bushes transformed into copses with meadow openings, and into forest outliers, with the height of tree stand ranging from 3-4 to 5-7 m and higher (photos 9, 10).

1984 1994 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

■ 1 - forest, bushes, partially signficantly bogged 5 84 6 21 6 21 6 21 6 21 6 21 6 76 6 "6 6 "6 6 "8 6 "8 " 54 " 54 " 54

■ 2 - bogged areas (meadow bogs, ponds etc . sq km) 0 83 0 94 0 94 0 94 0 94 0 94 0 94 0 94 1 22 1 22 1 22 1 22 1 22 1 22

■ 3 - arable lands 10 36 " 12 " 02 1 11 4 73 5 20 5 33 3 55 3 59 3 01 0 83 1 05 1 51 0 ""

□ 4 - stubble field, including the ones with glowing 1 -year-old hay fields 0 00 4 4" 1 19 8 55 3 00 3 32 3 49 2 69 3 40 2 98 5 15 3 08 0 36 1 83

□ 5 - winter crops 0 14 0 53 0 59 0 98 0 66 0 57 0 16 1 99 1 15 0 83 0 86 2 "5 2 18 1 36

□ 6 - abandoned meadow's overgrowing with bushes 0 00 0 56 0 56 0 54 0 68 0 70 0 "9 0 94 0 94 2 10 2 13 2 41 2 41 2 41

□ ~ - meadows for hay and glazing 2 59 2 62 3 57 1 82 3 83 3 89 3 12 3 83 5 17 3 14 2 66 2 98 2 46 0 00

■ 8 - pastures 11 ~4 " 52 6 06 5 "8 5 8" 3 85 0 54 0 69 0 24 1 25 1 "1 0 80 0 00 0 00

■ 9- abandoned pastures 0 00 0 73 2 86 2 81 2 85 3 84 4 90 5 8" 4 60 3 03 2 62 1 64 2 41 2 41

□ 10 - unexploited hay meadows 0 00 0 13 1 67 2 67 9 "8 8 73 9 00 10.96 10 09 13 31 15 09 19 88 23 62 26 06

□ 11 - liavfields 16 19 16 8" 17.03 16 2" 9 14 10 46 12 66 9 4" 10 53 10 04 8 65 4 35 3 98 4 09

Fig. 9. Structure of the habitats types in "Apsaryovo" nature boundary in 1984 and 1994-2007, km2 (Свиридова, 2008). ECOSYSTEMS: ECOLOGY AND DYNAMICS, 2020, Vol. 4, No. 1

Photo 4. Agricultural lands of the "Crane Land" nature reserve in the 1990s and early 2000s (photo on the left by M.N. Ivanov, on the right by T.V. Sviridova).

Photo 5. Swamping and bushes growth of the former hayfields and pastures Agricultural lands of the "Crane Land" nature reserve (photo by T.V. Sviridova).

Fig. 10. Structure changes of the maun types of agricultural lands in "Apsaryovo" nature boundary in 20 years. Legend: 1 - hayfields, 2 -pastures, 3 - fields, 4 - uncultivated lands, 5 - lands overgrown with bushes/forest, 6 - bogged areas, 7 -other (non-agricultural).

Photo 6. Mosaic structure increase of the agricultural landscapes in the early XXI century (photos by T.V. Sviridova).

At the same time during the recent years, some farms managed to boost their production, so the lands structure of the region, especially since 2010, have been changing again. Some farms increased the area of their cereal fields, and, to a lesser degree, hayfields too, which created the favorable conditions for many bird species of meadows and fields. However, regional production recovery in general followed the path of intense technologies. After the livestock was almost completely eliminated in the 1990s, the still-existing cattle farms began to recover their livestock, but they moved it from pastures to stables. This will not only cause the pastures to disappear, but also the hayfields to grow smaller (fig. 10), while the areas with new cultures (e.g. corn) will spread wider, unsuitable for birds.

Besides, the prevailing dairy husbandry, which required large meadows to feed on, is being gradually replaced now with the fast-payback cultures (potato, rice). They require the more intensive maintenance (treatment frequency, amounts of fertilizers, pesticides from vermin etc.) than the cereal fields, which is very unfavorable for birds (Свиридова и др., 2009). Generally, over the past 5 years, the large areas of abandoned and overgrowing lands and the intensifying production on the maintained fields caused polarization of the condition and appearance of the agricultural lands, inhabited by birds and other animals (photo 11).

It is also worth noting that the habitats conditions for many bird species of the agricultural lands in the "Crane Land" nature reserve, as well as of the bogs, depend on a combination of many factors: types and rates of agricultural management, weather and climate (Волков и др., 2013; Свиридова, 2014; Гринченко и др., 2015; Шариков и др., 2019). Those combinations and conditions differ from year to year and can change in the long perpective, which should be considered when panning event for the nature protection management of the territory of the future nature park.

Fig. 11. Current afforestation of "Apsaryovo" nature boundary, "Crane Land" nature reserve; trees and shrubs in 2014 marked as dark green on the map of 1774 (Карта дач ..., 1774).

Photo 7. The meadows of the Dubna floodplain overgrown with birches and willows after peat fires (photo by T.V. Sviridova).

Modern Landscape Structure of the Dubna Floodplain - the key part of the Nature Park "Crane Country"

In the early XX century the largest bog massifs in the north of Moscow Region were the following four: Dubnensky, Yakhromsky, Olkhovsky-Batkovsky and Orudyevsky. Nowadays only the most of the Dubnensky and the north half of the Olkhovsky-Batkovsky survived, now they are part of the territory of the future nature park (fig. 3).

There are conditionally natural and anthropogenic biotopes in the current landscape structure of the Dubna Lowland.

Among the natural biotopes of the Dubna Lowland, we can emphasize some of them, such as meadows of the middle and upper floodplain, meadows of the lower floodplain, bogged forests and bogs with shrubs, belonging to the floodplain lands, and transitory bogs of the river valleys, but outside the floodplains.

Photo 8. Birch restoration on the abandoned agricultural lands in 2011 after the fires of 2010 (photo by T.V. Sviridova).

Photo 9. Afforestation of the abandoned agricultural meadows and fields in the late 1990s (on the left) and 2010s (on the right; photos by T.V. Sviridova).

The anthropogenic biotopes include cultivated meadows, fields with cereals, vegetables and other cultures, fallow lands, functioning peatbogs and historically formed residential areas.

The following table shows the biotopes dynamics in the Dubna Lowland during the XX century. We determined that amelioration caused the bogs with sedge and tussocks (including the sedge bogs and bogs with sedge and feather moss) to vanish almost completely; although those bogs occupied more than 30% of the valley before.

Photo 10. Afforestation of the agricultural lands of "Apsaryovo" nature boundary, according to the aerial photography data collected in 2000 (first image, photo by M.N. Ivanov) and 2014 (second image, photo by I.S. Smetanin).

Photo 11. Modern polarization of the agricultural lands in the "Crane Land" nature reserve, "Apsryovo" nature boundary, in 2014 (photo by I.S. Smetanin).

In the Dubnensky bog massif it was not only due to the draining, but also due to the changes of mineralized water discharge into the bogs from the adjoining Taldomsky moraine-hilly ridge caused by hydraulic constructing. Part of the bogs with sedge and feather moss changed its water consumption type from delluvial to atmospheric and relatively quickly transformed into transitory sphagnum bogs, some of which are still deforested. The sedge bogs located near the terrace and bogged forests of the floodplain were affected by the transformation the most. The drainage of the floodplain forests and bogs improved the conditions for plants growth, the quality of forests

improved by 1-2 points, the tree stand grew higher and closer, the drained bogs began to overgrow with alder and birch. As the result, the bogged forests of the Dubna Lowland spread over more than a half of the territory, which was twice more than right after amelioration. The area of transitory bogs grew three times smaller.

Table. Correlation between the Dubna River biotopes before amelioration in the XX century and during 2000-2010.

Biotopes The Dubna River Valley

Before amelioration During 2000-2010

hectares % hectares %

Conditionally-naturally formed

Floodplain

Meadows of the medium and upper floodplain level (floodplain meadows) 241 1 636 2,3

Meadows of the lower floodplain level (lowland meadows and meadow bogs) 2207 8 2040 7.4

Bogged forests (alder) 6189 22 14248 51.6

Bogs with shrubs (reeds and willows) 438 2 754 2.7

Bogs with sedge and tussocks 8577 31 - -

Out of the floodplain

Transitory and high bogs 9962 36 3491 12.6

Anthropogenically formed

Floodplain

Grass cultures - - 1665 6

Cereal crops - - 1322 5

Vegetable crops - - 119 0.4

Fallow lands - - 3132 11.3

Flooded peat quarries - - - -

Functional peatbogs - - 67 0.2

Out of the floodplain

Residential areas no data 140 0.5

Total: 27614 27614

Notes to the table: data on the areas of different Dubna biotopes during amelioration is provided by E.S. Markov (1973); areas of the current biotopes биотопов were determined by the field researches and satellite imageries analysis made with ArcGis (Esri) geoinformational complex of programs.

Nowadays there are more than 70% of natural and conditionally natural biotopes in the Dubna bog massif. In 2012 the state flooding project for the disturbed peatbogs was implemented there, and some other projects were realized in the next years (Каменнова, Минаева, 2018; Гринченко и др., 2017).

General Tendencies of Birds Population Dynamics in the North of Moscow Region

in the XX and early XXI centuries

Vertebrates in the territory of the projected nature park are very diverse. We registered some rare and protected animals species there. The almost total absence of synathropic species in the animal population is an evidence of a high protection and integrity level of this natural complex.

We found 247 birds species in total, both nesting and migrating.

Species common for the coniferous, coniferous-small-leaved and mixed forests are the basis of the fauna complex of the Non-Black Earth center of Russia. Species ecologically associated with trees and bushes are dominant (90%). Synathrophic species are only 4% and mostly encountered on the outskirts of human settlements.

There are 68 species in the main catalogue of the Red List of Moscow Region (2018) and 39 in the monitoring catalogue. At different times 63 main species and 35 monitored ones were found in the territory of the projected nature park, which is 92.6% and 89.7% respectively.

The jacksnipe from Appendix 2 was considered gone from the territory, but then was found during its migration. 19 species are registered in the Red List of Russia, but 2 of them were not included into the Red List of Moscow Region because they had not been found yet at the moment of its publishing.

For the past 30-40 years in the territory of the projected nature park "Crane Country" the researchers were intentionally searching for those species, applying specific methods of census, registering every random encounter and thoroughly analyzing literature data. This is why the perennial dynamics of their numbers is clearer than that of the common ones.

The main factors supposedly affecting the birds numbers in the north of Moscow Region in the late XX and early XXI centuries are the agricultural decline, peat digging decrease, formation of new bodies of water in the spots of the former peat quarries, increase of forests age and area, growth of Castor fiber population, and modern climatic changes.

The decline of agricultural production, caused by the economic and political crisis of the 1990s, made the area of exploited agricultural fields, hayfields and pastures to decrease by more than a half, and they began to overgrow with bushes and trees. The maintenance of the open and closed systems of drainage amelioration stopped, which led to the secondary flooding of the territories. The fertilizers and pesticides usage was lowered. In the most of the territory the disturbance level significantly dropped as people's visits became more infrequent. Meanwhile, in the 2010s some farms in the territory of the future nature park managed to recover their agricultural production, including the one requiring intense technologies. The latter caused polarization of the agricultural landscape in the north of Moscow Region. Generally, now the unexploited agricultural lands are prevailing in the region (Свиридова и др., 2006, 2016а; Гринченко и др., 2015).

The almost absolute cease of peat digging by the 1990-2000s was due to the economic decline and to the fact that the main peat stocks had been finally drawn, and the significant areas with bogs had become the part of the systems of the specially protected natural sites in the 1970-1990s (Журавлиная родина ...., 2009). Water was not discharged from the peatbogs anymore, the lowlands began to flood in the spot of the drawn peatbogs. A new water reservoir formed in the spot of Ochevsky milling peat fields (about 2.5 thousands ha). It is now the part of the future nature park, too.

For some decades of the XX century the forests area was growing, including the ripening and mature coniferous forests and overmature deciduous forests, the amount of cutting sites decreased as well (Лесной план ..., 2008). For the past 10 years the situation changed a little. The structure of the forest biocenosis was severely affected by the fires, windfalls, vermin invasions and following cuttings. During the same period the share of young deciduous forests, growing in the abandoned agricultural lands, increased (Конторщиков и др., 2014, 2019).

The average annual air temperature and annual sum of precipitation increased in the most of European Russia territory. The main precipitation increase happens during winter, the maximal positive temperature changes in winter and spring, which helps to increase the level of bogging of the valley territories and growth of soil moisture (Кузьмина и др., 2011; Кузьмина, Трешкин, 2017, 2018).

Changes in Birds Numbers in the North of Moscow Region in the 1980-2010

Decrease of birds numbers in the 1990-2010s was registered for Streptopelia turtur, Corvus frugilegus, Motacilla flava, Anthus pratensis, and probably for Alauda arvensis, as well as some

other species of meadows and fields. It was mostly due to reduction of maintained fields, short-grass pastures and hay meadows, and to increased afforestation of agricultural lands. The numbers of Anthus pratensis could be affected by some other factors, because in the 2010s it dropped more than twice in the high and transitory bogs in the north of Moscow Region.

Parus cyanus continued to decrease in the 1990-2010s despite its fluctuations during different years. The main reason for it was the frequent ice rains during autumns and winters, covering reed with an ice shell which made it difficult for the birds to assess their main food - the larvae living in the stems (Конторщиков, Гринченко, 2015; Конторщиков и др., 2019).

Lagopus lagopus has almost disappeared from the region. Coracias garrulus disappeared after 1982, and Lullula arborea has never been encountered since 1983. By the 1980s these species already tended to reduce in their numbers (Зубакин и др., 1986; Кисленко и др., 1990в; Красная книга ..., 2018). In the 2000s the numbers of Philomachuspugnax decreased, and it is possible that the bird stopped to nest in the north of Moscow Region (Свиридова и др., 2009). Phoenicurus phoenicurus became rare and almost disappeared from the forests by the early 1980s (Конторщиков и др., 2014). Columba oenas was regularly nesting in the forests along the Dubna River in the 1990-2010s, from Nushpoly to Konstantinovo settlements, but disappeared from there and some other areas in 2014 (Конторщиков и др., 2019). The reasons for the decrease of these species numbers are still not quite clear.

The numbers of much more species increased or species started to show up in the region for the first time, including both nesting and migratory birds. We recorded 56 in total.

We have emphasized some groups of species, the reasons for changes in the numbers of which we believe to be quite similar. The assignment of the species to one or another group may be arguable, however it does not affect the general idea.

1. The group of 20 species (35.7% from the total number of species which grew in numbers), the increase of which is due to the economic decline of agricultural production and cease of peat digging.

1a. Among them, another group of 9 species (16%) can be highlighted, closely related to the open agricultural landscapes of Moscow Region: Lyrurus tetrix, Perdix perdix, Coturnix coturnix, Circus pygargus, Crex crex, Asio flammeus, Gallinago media, Hippolais caligata and Locustella naevia. Their numbers grew mainly in the 1990-2010s, due to the increased mosaic pattern of agricultural habitats which was caused by partial overgrowing with high grass and bushes, local bogging, decreased disturbance level and smaller amount of animals deaths during agricultural activities. All of the above improved the feeding, nesting and protecting conditions (Свиридова и др., 2006, 2016а). The climate warming could be favorable to these species as well, because many of them are of southern origin and came to the forest zone while the agricultural landscapes were forming there.

1b. Economic decline had a positive effect on some of the older native species, associated mainly with bogs and bogged forests (7 species, 12.5%). The nesting ones are Milvus migrans, Aquila clanga, Grus grus, Tringa nebularia, and Lanius excubitor. Their numbers grew mainly in the 1990-2000s as well. Since 2000 the encounters of nesting Circaetus gallicus became regular. In 2007 Surnia ulula was found there nesting for the first time (Варламов и др., 2007). This group prefers the bogging territories, low disturbance level, overgrowth and secondary waterlogging of abandoned peatbogs, and increase of mature forests areas.

1c. Some species (5.3%) grew in numbers probably due to the formation of large bodies of water in the 1990s in the spots of former peatbogs. These species include Podiceps cristatus, Aythya fuligula, and Haliaeetus albicilla.

2. Another big group includes 25 southern species (44.6%), inhabiting the region along the northern border of their area. The numbers of the nesting ones grow bigger, as well as the migratory ones. The main reason for them to appear in the region is probably due to the current climate warming (Кузьмина, Трешкин, 2017, 2018), while the early springs influence them to move

deeper into the north. Today these species usually inhabit the northern areas throughout Europe (Соколов, 2010).

2a. The most of these species (26.8%) is associated with water: Podiceps nigricollis (nesting since the early 1990s), Ixobrychus minutus (first encounters in 2012 and 2013), Casmerodius albus (encountered in 2004), Cygnus olor (visiting since 1994), Rallus aquaticus (encounters since 2008), Porzanaparva (numbers grew in the 2000-2010s), Gallinula chloropus (numbers grew in the 1970-1990s), Fulica atra (numbers grew in the 1990-2000s), Tringa stagnatilis (apparently, nesting since the 1980s), Chlidonias niger (numbers grew in the 1960-1980s), C. leucopterus (began to nest and grew in numbers in the 1970-2000s), Locustella luscinioides (encounters since 2001), Acrocephalus scirpaceus (encounters since 2007), A. arundinaceus (encountered since 1965, numbers grew in the 1990-2000s), Remiz pendulinus (numbers grew in the 1990-2010s). It is worth noting that the increase of the bodies of water areas in the 1990-2000s had undoubtedly had a favorable effect on these species.

2b. Some of the "southern" species are associated with fields and meadows (7.1%): Circus macrourus (encounters since 1990, nesting since 1999), Hieraaetus pennatus (visiting since 2008), Anthus campestris (visited in 1999 and 2007), Saxicola torquata (encountered in 1974 and 2001).

2c. Other species are directly or indirectly associated with human settlements (5.3%): Ciconia ciconia (began nesting and grew in numbers in the 1970-2000s), Streptopelia decaocto (encountered since 1981), Phoenicurus ochruros (encountered since 2008).

2d. Three more species are associated with gardens and forest margins: Otus scops (encountered since 1981), Merops apiaster (breeding colony existed in 2002-2010), Coccothraustes coccothraustes (grew in numbers in the 1960-1990s).

3. The next group includes some forest species (10.7%), which recently grew in numbers in the north of Moscow Region: Dendrocopos leucotos (in the 1980-1990s), Nucifraga caryocatactes (1990s), Strix uralensis (1980-1990s), S. nebulosa (regularly encountered since 1994), Prunella modularis (1960-1990s, plus its habitats specter grew wider), and Parus palustris. The reasons for their growth are mostly unclear to us yet. Probably, it happened due to the increase of the mature forests area (Конторщиков, Ярошенко, 2008).

We find it difficult to include some species into any of the said groups. Their growth was more likely caused by some specific reasons. Haematopus ostralegus is rarely encountered in the north of Moscow Region since 1979, first as a migratory bird only, then as the nesting one since 2011 (Конторщиков и др., 2014).

Larus canus was always rare there, but became abundant in the north of Moscow Region in the 1970-1990s due to its transition to the anthropogenic food and inhabiting of the flooded abandoned peatbogs, as well as arable lands far from water (Зубакин, 2001).

Motacilla (citreola) werae have been spreading throughout Europe for a long time now, from east to west (Зубакин и др., 1988), but in the north of Moscow Region it began nesting in the second half of the 1970s. Its numbers were growing until the 1990s (Конторщиков и др., 2009).

It is also not quite clear which group some of the following species belong to: Xenus cinereus (nesting since the early 1980s), Larus argentatus / L. cachinnans (regularly encountered since the 1980s, probably due to the increase of its numbers in general in the center of European Russia), and crow (numbers grew in the 1970-1990s).

Among the mentioned species there are some the numbers of which did not have any positive dynamics in the 2010 after they appeared in the region for the first time or grew in numbers during the 1980-2000s: Dendrocopos leucotos, Motacilla (citreola) werae, Acrocephalus arundinaceus, Hippolais caligata and Coccothraustes coccothraustes.

Therefore, for the past 40 years in the territory of the future nature park the 2 main tendencies are obvious.

Firstly, due to the climate warming, the southern species which are mainly associated with the

bodies of water and open spaces, start to come to the region.

Secondly, due to the improvement of the feeding and protecting qualities of the habitats after the long-term economic decline, the condition of many old native species of bogs and forests improved as well.

It is worth noting that the numbers of Ursus arctos grew during the same period of our researches, and Lutra lutra, Lynx lynx and Canis lupus became more regular. They all are native fauna of the forests and bogs as well, and have been inhabiting this region before the agricultural activities took place.

Conclusions

1. The forests of Moscow Region in the late XIX and early XX centuries dropped to 21% in 1938. An active forest restoration was carried out during the 1950-1990s, the amount of cuttings was decreased, and in the next 30 years the unused agricultural lands began to overgrow with trees. Today the forests occupy 47.6% of Moscow Region.

2. Bogs development in the territory of the projected nature park was carried out in several steps. The greatest ameliorative works were made in the second half of the XX century. However, drainage, efficient for the agriculture, had never been accomplished. Since the early XXI century, while the agricultural load was increasing, most of the ameliorative systems were left unmaintained and climate was changing, the bogging of the region became very obvious.

3. In the late XX - early XXI centuries, during the decline of agriculture and modern climate changes, the amount of peat and grass fires significantly increased, especially during the dry years. Therefore, in 2004-2019 in the north of Moscow Region the flooding works were started for the disturbed peatbogs, which lowered their fire-hazardous and influenced the recovery of bog ecosystems.

4. Most of the agricultural lands in the north of Moscow Region were bogged and covered with forests just recently. The agricultural development of the territory was carried out in several steps and was mostly finished by the middle of the 1980s. The prevailing agriculture type in the territory of the future nature park was cattle maintenance (mostly for milk production), cereal growth and meadow cultivation. It helped to maintain the stability of populations of many rare and game bird species.

5. In the past 30 years a significant decline of agriculture took place. It caused the amounts of cattle and areas for grazing to decrease, and some qualitative and quantitative transformations to change the agricultural landscapes due to afforestation and bogging of unmaintained lands. However, in the 2010s during the production growth on some farms, everything began to change in some territories. Meanwhile, the production was intensifying, and the structure of exploited agricultural lands was changing: cattle handling was replaced with pig-breeding, potato and rapeseed cultivation. The absolute cease of agricultural production and its intensification can negatively affect many birds of meadows and fields in the already existing specially protected natural sites and in the territory of the projected nature park.

6. The nature in the north of Moscow Region is uniform due to the mutual origin of its landscapes, development history and current processes. The creation of the "Crane Country" Nature Park will make it possible to preserve the valuable natural-anthropogenic territorial complex, characterized by the high biological diversity and a chance for conservation and functioning of natural ecosystems, if the nature resources are utilized correctly.

7. The current landscapes of the projected nature park are a habitat for many rare animal species, and especially for a significant amount of birds. The latter are very sensible to the changes in the north of Moscow Region. The main drivers for the population dynamics and distribution of the birds in the region are the types and intensity of agriculture and forest management, flooding and bogging of the former peat quarries, and modern climate changes. Creation of the "Crane Country" Nature Park and its ecological management will allow to preserve the habitats of rare and

background species in the north of Moscow Region.

Acknowledgments. The historical and scientific materials were collected in the north of Moscow

Region for many years by the authors of this article and our colleagues and friend. We are grateful

to them for their help and contribution.

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