On the abundance and occurrence of the mangrove crabs, Scylla spp. (Crustacea: Portunidae) from Munjang mangrove, Bangka Belitung Island

Nadhifah Raniah, Henri Henri, Kurniawan Kurniawan
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Abstract

The mangrove ecosystem is one of the most productive ecosystems on earth. This ecosystem provides a lot of functions for the living organism inhabiting here, such as fishes, mollusks, echinoderms, crustaceans, ect. The mangrove crab is one of the common crustaceans that can be found in the mangrove. This Purtunidae crab is very popular due to their role in the food chain as well as for the economic income that has a high value in the market. However, overexploitation may decrease the crab population. This study aimed to investigate the abundance and occurrence of the mangrove crabs from Munjang mangrove, Bangka Belitung Island from August 2020 to June 2021 using baited traps with the line transect method at four zones. A total of four species of mangrove crabs, Scylla olivacea, S. paramamosain, S. serrata and S. tranquebarica, were found in this location and dominated by S. serrata. Shannon diversity index (H’) was a in low category (<1), evenness index range (J) from 0.35 to 0.89, and there was dominant species in this study. The bed sediment iswas dominated by the muddy clay substratum except in zone 4 with sandy. Overall, this location is a suitable habitat for the Scylla spp. And better management is urgently needed before these crabs are exploited by humans.
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邦加勿里洞岛Munjang红树林蟹类Scylla spp.(甲壳纲:蟹科)的丰度和发生
红树林生态系统是地球上最多产的生态系统之一。这个生态系统为生活在这里的生物提供了许多功能,如鱼类、软体动物、棘皮动物、甲壳类动物等。红树林蟹是红树林中常见的甲壳类动物之一。由于其在食物链中的作用以及在市场上具有很高价值的经济收入,这种Purtunidae螃蟹非常受欢迎。然而,过度开发可能会减少螃蟹的数量。本研究旨在调查2020年8月至2021年6月,Bangka Belitung岛Munjang红树林红树林蟹的数量和发生情况,采用线样法在4个区域进行饵网诱捕。红树林蟹类共有Scylla olivacea、S. paramamosain、S. serrata和S. tranquebarica 4种,以S. serrata为主。Shannon多样性指数(H′)为低类别(<1),均匀度指数(J)在0.35 ~ 0.89之间,存在优势种。除4带含砂外,其余地层以泥质粘土基质为主。总的来说,这个地方是Scylla蟹的适宜栖息地,在这些蟹被人类利用之前,迫切需要更好的管理。
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