Identification of Gorgonian Isis hippuris (Linnaeus 1758) potential in waters Conservation area of Dampier Strait Raja Ampat Regency of Indonesia Текст научной статьи по специальности «Биологические науки»

DOI https://doi.org/10.18551/rjoas.2018-06.50

IDENTIFICATION OF GORGONIAN ISIS HIPPURIS (LINNAEUS 1758) POTENTIAL IN WATERS CONSERVATION AREA OF DAMPIER STRAIT RAJA AMPAT REGENCY

OF INDONESIA

Arafat Gulam*, Fahlevi Arief Reza, Widyasari Ferliana

Sorong Division of Coastal and Marine Resources Management, Ministry of Marine Affairs and Fisheries, Indonesia *E-mail: gulam arafat@yahoo.com

ABSTRACT

Gorgonacea is a group of soft corals spread in Indo-Pacific waters and some other places, especially tropical areas. Soft corals are the second biggest component after hard corals. Sea Bamboo or Isis hippuris are one of the types of soft corals set as limited protected biota. Waters Conservation Area of Dampier Strait is 1 out of 8 conservation areas in the Raja Ampat regency. The purpose of this study is to know the distribution of sea bamboo in the Waters Conservation Area of Dampier Strait Raja Ampat Regency, Indonesia. The result of identification shows that from 67 points there are 24 observation stations of coral reefs and only 13 stations are found for sea bamboo. Based on the results analysis, it is obtained a coverage percentage value of live coral is 43.47%. This value is included in the medium category. Sea bamboo is recorded with the total colony as many as 581 colonies with the density value of 0.096 colony/m2 or 968.33 colony/Ha. The distribution of discovered sea bamboo ranges in the depth of 3-7 meters.

KEY WORDS

Isis hippuris, waters conservation, rapid resources inventory, point intercept transects, belt transect.

The collection of live corals for marine aquarium trade has increased significantly in the past few years. This has raised the concern over the ecological implication of coral biological resources (Ferse et al., 2012). Morphotypes Isis hippuris is an ecological divergence and acts as the anthropogenic indicator that thrives on the mechanism of biodiversity and coral health in the Coral Triangle (Rowley, 2018).

Isis hippuris contains various compounds that can be used by the pharmaceutical and biochemical industries. The isolation of Isis hippuris produces hippuristanol which is a specific anti-viral substance with the ability to slow down and possibly prevent the process of viral replication (Manuputty, 2008). Isis hippuris contains a group of fatty acids, phenylacetonitrile, 1,2 benzenedicarboxylic, naphthalene and xylane, phenol-derived compound, hydrocarbon compound (Trianto et al., 2004), containing alkaloid, phenol, flavonoid and steroid compounds (Sayuti, Putri and Yunianta , 2016), containing Hippuristerone A compound, polyoxygenated steroids (Sheu et al., 2000), containing polyoxygenated steroids, J-L hippuristerones, E-F hippuristerones and gorgosteroids, 1a, 3p, 5p, 11a-tetrahydroxygorgostan-6- one (Chao et al., 2005). The extract has characteristics of cytotoxicity to carcinoma cells (Liang et al., 2010), the hippuris contains 2-butoxyethanol, hexanedioic acid (Sayuti, Putri, and Yunianta, 2017) containing Five novels (22R, 23S, 24S) -steroids, hippuristerones EI (Sheu et al., 2003)

Due to high market demand, the exploitation of Isis hippuris in some places is rather excessive and has damaged the ecosystem. In addition, Isis hippuris can be classified as endangered (Edrus and Suman, 2013). Limited protection will be carried across Indonesian waters within a period of 5 (five) years, with the exception of research and development (Kepmen KP Nomor 46/KEPMEN-KP/2014). The purpose of this research is to know the distribution of sea bamboo in Waters Conservation Area of Dampier Strait Raja Ampat Regency, Indonesia which is one of the habitats of Isis hippuris.

MATERIALS AND METHODS OF RESEARCH

The research was conducted on October to November 2016 in the Waters Conservation Area of Dampier Strait Raja Ampat Regency, Indonesia. The research identified the potential of sea bamboo in the Waters Conservation Area of Dampier Strait Raja Ampat Regency. There were 67 observation points consisting of 43 observation points with RRI method and 24 observation stations of coral and sea bamboo.

One of the methods to identify the existence of Isis hippuris is using Rapid Resources Inventory namely snorkeling on the surface at a certain interval to determine the existence of Isis hippuris. The amount of discovered Isis hippuris is recorded based on its type (Wilkinson et al., 2003).

Point intercept transects (PIT) is used to determine the bottom waters coverage (English et al., 1997) to measure the object of bottom waters at the 50 cm interval under the 50 meters belt transect (100 points). Using the sufficient point they can give information comparable with LIT (Hill and Wilkinson, 2004).

Belt transect is similar to line transect but broader and often used to survey the specific impact on benthos such as bleaching or disease, or calculating the invertebrate(Hill and Wilkinson, 2004). Belt transect is used to calculate the number of the colony and measure the height as well as the width of the Isis hippuris colony with the transect length of 50 meters and the observation area of 5 meters (2.5 meters to the left and 2.5 to the right). For the analysis, comparison of the number of colonies is used to the area of belt transect observation.

RESULTS AND DISCUSSION

Based on the 24 observation stations of corals and sea bamboo, only 13 stations are discovered to have sea bamboo colony with a total colony of 581 colonies in the depth range of 3 - 7 meters. The division of the observations stations based on the area is as follows:

Table 1 - Distribution of observation stations by location

No Location Station

1 Waters of Salawati Island 1 - 6

2 Waters of Batanta Island 7 - 13

3 Waters of Mansuar Island 14 - 16

4 Waters of Gam Island 17 - 24

The dominant substrate type is discovered between Acropora (AC) amounted to 24%, Non-Acropora (NA) amounted to 19%, the soft coral (SC) amounted to 10%, and coral fragment (RB) amounted to 18%. As for the algae species, Sponge (SP), dead coral (DC), dead corals with overgrown algae(DCA), and sand (Sand) and other species (OT) are also found but in small quantity. More details of information can be seen in Figure 2.

Based on the data of bottom waters coverage, it is obtained a percentage value of live corals coverage amounted to 43.47%. This value is categorized as a medium. On some stations, it is discovered a low coral coverage, especially in the Salawati area. The highest coral coverage is discovered in the northern Salawati area, south of Batanta, Northern Batanta, and Northern Mansuar. This is supported by relatively protected waters condition and good current circulation. Thus, nutrient sources are abundant. For more details see Figure 3.

The lowest live coral coverage is discovered in station 4 namely waters of Jefman Island amounted to 8%, and the highest is discovered in the station 8 namely waters around the Kasuari Island of South Batanta amounted to 87%.

Sea bamboo is only discovered in 13 observation stations with the total colony amounted to 581 colonies with the density value of 0.096 colony/m2 or 968.33 colony /Ha. The distribution of sea bamboo is discovered around the depth of 3-7 meters. The waters condition where sea bamboo was discovered tend to be an area with low speed of current

and protected waters such as in the Wamega, North Batanta, Northern Mansuar, and South Gam areas.

Figure 1 - Monitoring Station Map of Potency of Isis hippuris

Bottom Waters Coverage 1 nn 0/

90% 80% 70% 60% M (U 1 i ■ i |_|. ■ OT

■ R

S

SP

ALGA

a> " 40% SC

(Ü 40% & ono/ RB

20% DCA

10% NA

AC

0% 1 1 1 I 12 3 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2122 23 2 Observation Station 4

AC

NA

DC

DCA

RB

SC

ALGA

SP

OT

24.22

19.25

4.25

8.63

18.54

10.32

3.79

2.79

7.08

2.78

0.33

*in percents.

Figure 2 - Bottom Waters Coverage

S

R

The largest number of sea bamboo colony is discovered in the Wamega and Warir Sapo area in the North Salwati district with the total of 263 colonies. Then, the second largest is in the Northern Mansuar area namely Yenbuba and Kurkapa with the total of 207 colonies. Meanwhile, the least number is discovered in North Batanta Area amounted to 16 colonies. For North Salawati and South Batanta areas, no colony of sea bamboo is found (Figure 4). This is possibly dues to the very strong and famous current condition in this Sagawin Strait area. Based on the data of current velocity measurement results, Sawagin Strait has the current velocity off 0.327 m/s. Based on the distribution of sea bamboo, it is found pattern criteria of grouping distribution (Mardianto, Nur, and Ramli, 2016).

Live Coral

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Observation Station

Figure 3 - Percentage of live corals by station

160 140 > 120 ° 100 o £ 80 0 S 60 .Q 1 40 z 20 Sea Bamboo Colony

14 \1

116

103 1C )4

55

12 18

0 0000000 3 2 0 1 0 2 .T_i_ 0

0 i 12 i 3 1 1 1 1 1 1 1 1 1 1 1 1 4 5 6 7 8 9 10 11 12 13 14 15 Observation Station 16 i i i i i i » 17 18 19 20 21 22 —í—r 23 24

Figure 4 - The Number of Sea Bamboo Colony

The sea bamboo colony is measured by the height and width of the colony. The height of sea bamboo discovered in the Waters Conservation Area of Dampier Strait ranges from 5 - 104 cm, while the width ranges from 2 - 110 cm. the amount of distribution based on the height and width is presented in Figure 5.

The number of sea bamboo colony with height size range of 31-40 cm is discovered to be at most 139 colonies, whereas at least only 2 colonies in the 101 - 110 cm height range. The highest size found is discovered in waters of Warir Sapo, while the shortest is found in waters Wamega.

Heigt Size

139

^ 140 ° 120 5 100 •S 80 S 60 _q 40 m 20 1 0 m

OC

/ 85 74

52 Ad

/

7 15 25 9 .

m ■ — 2

i i 1 1 1 —1 1—V—V—•—

& $ $ $ & A* & & &

*V # # # # *

height in cm

Figure 5 - Number of Sea bamboo Colony Based on Height Size

Width Size

n

° 120 2 100

e

-Q

m

124

^ ^ N* N* N*

^ V V V V V <0* An V &

width in cm

Figure 6 - The Number of Sea Bamboo Colony Based on Height and width

While based on the width, the largest number of sea bamboo colony is found in the range of 11 - 20 cm with the number of 124 colonies and the least is only 4 colonies in the width range of 101 to 110 cm. The widest colony size is found in waters of Arevi, North Batanta, while the narrowest width is found in Wamega waters.

CONCLUSION

The condition of bottom waters coverage of Waters Conservation Area of Dampier Strait Raja Ampat is included in the medium category with the percentage of live coral coverage of 43.47%. Meanwhile, the population density of sea bamboo is 0.096 colony/m2 or 968.33 colony/Ha. The distribution of sea bamboo in the Waters Conservation Area of Dampier Strait does not spread evenly, which is only found in certain areas.

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