Sea urchins in the intertidal zone on Karanrang Island, Pangkep Regency; Density, abundance, community structure, and distribution patterns

Sri Nursyarina Fitri, Hartati Tamti, Mesalina Tri Hidayani, Heriansah Heriansah
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Abstract

Sea urchins were ecologically and economically important biota, but scientific information on sea urchins is still very minimal and there is no ongoing monitoring. The purpose of this study was to determine the density, abundance, community structure, and distribution patterns of sea urchins in the intertidal zone of Karanrang Island, Pangkep Regency. The research in June-July 2022 was carried out at high and low tide using three transects measuring 1 x 1 m consisting of four plots measuring 50 x 50 cm.  Determination of stations based on information from local residents to get observation stations based on tidal conditions. The results showed that three species of sea urchins from two families were found, namely Diadema setosum, Echinothrix calamaris, and Tripneustes gratilla. The species of D. setosum was found to be very abundant (97.3-97.6%) and tended to be more abundant during high tide than during low tide. The index of diversity and uniformity of porcupine species is low (H' = 0.130-0.142 and E = 0.118-0.129). The species dominance index was in the range of 0.946-0.953 indicating high dominance of D. setosum. Spatially, D. setosum had a uniform distribution pattern, whereas E. calamaris and T. gratilla were distributed in clusters. Further spatial and temporal research is needed to comprehensively determinant the conditions of the sea urchin population on Karanrang Island, Pangkep Regency.
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庞克普卡兰令岛潮间带海胆的研究密度、丰度、群落结构和分布格局
海胆是一种具有重要生态和经济意义的生物,但有关海胆的科学信息仍然很少,也没有对其进行持续监测。本研究旨在了解庞克普卡兰令岛潮间带海胆的密度、丰度、群落结构和分布格局。该研究于2022年6月至7月在涨潮和退潮时进行,使用了三个1 x 1 m的样带,由四个50 x 50 cm的地块组成。根据当地居民提供的信息确定台站,得到基于潮汐条件的观测站。结果表明,共发现2科3种海胆,分别是Diadema setosum、Echinothrix calamaris和trineustes gratilla。结果表明,潮尾草种类非常丰富(97.3 ~ 97.6%),且潮尾草的丰度在涨潮期大于退潮期。豪猪物种多样性和均匀性指数较低(H′= 0.130 ~ 0.142,E = 0.118 ~ 0.129)。种优势度指数在0.946 ~ 0.953之间,表明尾毛草具有较高的优势度。从空间上看,毛菖蒲呈均匀分布,而菖蒲和花叶菖蒲呈集群分布。需要进一步的时空研究来全面确定庞克普摄摄区卡兰令岛海胆种群的状况。
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