This study had two aims, first was to determine the index of diversity, evenness, richness and dominance of gastropods species in the mangrove ecosystem, to assess the important value index of mangroves in the mangrove ecosystem, and the second one to understand the association of gastropods and mangrove in the mangrove ecosystem in Payum Beach, Merauke Regency. This research was conducted in September-October2021. This research using method of transect with a 100 m lenght of transect size. The research location devided into two station that are distinguished by the mangrove ecosystem to see the associated mollusc species. There were 8 species of gastropods that were analyzed including: Terebralia palustris, Terebralia semistriata, Telescopium telescopium, Cassidula angulifera, Cerithidea obstusa, Littorina intermedia, Littorina pallencens, and Littorina scabra. The diversity index (H’) of gastropods is 1,9370 so it is categorized as moderate, meanwhile the richness index (R) is 0,86 and the dominance (C) 0,16 both of these categorized as low, whilst inversely proportional to the evenness index (E) which shows the number 0,93 which means high evenness so that the community is stable. Furthermore, there are 3 types of mangroves namely Bruguirea cylindrica, Lumnitzera racemosa, dan Aegialitis annulata. Nonetheless, the relationship between the abundance of individuals of gastropods and the presence of mangroves at the research sites at station I and station II tended to be weak.
Pemanfaatan perikanan secara lestari sangat diperlukan agar sumberdaya perikanan yang ada saat ini bisa terus dimanfaatkan dan juga dalam rangka pemulihan stok perikanan yang telah rusak. Ikan nila (Oreochromis niloticus) dan ikan mujair (Oreochromis mossambicus) secara luas telah dikenal sebagai salah satu spesies ikan air tawar yang penting dalam perikanan budidaya. Penelitian ini dilakukan dengan tujuan identifikasi spesies ikan Oreochromis spp. dari perairan daratan Merauke dengan menggunakan marka gen COI. Amplifikasi DNA dengan gen COI menghasilkan panjang sekuen DNA 656 bp dengan hasil identifikasi adalah O. niloticus dan O. mussambicus dengan tingkat kemiripan 100 % pada masing-masing spesies. Berdasarkan analisis filogenetik dan jarak genetik, sekuen DNA yang dianalisis membentuk clade sesuai dengn hasil indentfikasi dengan jarak genetik 0,000 - 0,002 pada ikan nila dan 0,000 pada ikan mujair. Analisis keragaman genetik ditemukan hanya 1 haplotype dari kedua jenis ikan tersebut. DNA barcode dan filogenetik dapat digunakan dalam mengidentifikasi spesies dalam pengelolaan dan konservasi.
Mangrove forests in Indonesia play an important role in mitigating climate changes and providing other ecosystem services; however, their extent continues to decline. Information on mangrove community and its carbon stock, especially for Papua, is still limited. This study was conducted to describe vegetation structure and estimate carbon stock in Payumb Coast in Merauke District, Papua. There were three primary mangrove species identified, namely, Avicennia alba, Rhizophora apiculata and Sonneratia alba. Species dominance varied along a gradient of salinity and substrate perpendicular to the shoreline. A. alba is dominant in the closest zone to the shoreline (importance value 205.76%), while R. apiculata is dominant in the farthest zone (importance value 185,35). At the community level, the carbon stock in trees differed significantly between zones (p<0.05), with the highest in the zone dominated by R. apiculata. This study has provided preliminary data on carbon stock estimation at the community level; further studies should be conducted to estimate total carbon stock based on all above-and belowground components. More accurate estimations become important, as it was found that different species could contain significantly different carbon stock; thus producing variation among mangrove communities.
Forests reduce and store CO2 through a process of "sequestration" that is the storage of carbon from the atmosphere and its storage in several copartments such as plants, litter, and soil organic matter. Mangrove forest is a unique and unique type of forest because it is able to adapt to environments with high salinity, soil conditions without oxygen and once in a while. ne example of mangrove forests in Indonesia is mangrove forest in the Kumbe river estuary, Merauke Regency, Papua Province. The Kumbe river estuary is one of the eastern Indonesian waters bordering the Indian Ocean. At the Kumbe river estuary there has been no research on carbon stocks in the mangrove community. So it is necessary to do research on carbon stocks in the region. In this study the measurement of carbon stocks used was done by measuring carbon above ground, and ground. Above ground carbon stock components include trees, understorey, and litter. The mechanism for measuring above ground carbon stock is done by estimating biomass, which is then converted to carbon concentration. The results of this study indicate that the carbon stocks in trees, Understorey and litter in sequence are 85.55 Mg / Ha, 392.93 Mg / Ha and 70.75 Mg / Ha; 0.78 Mg / Ha, 1.26 Mg / Ha and 1.24 Mg / Ha and 2.04 Mg / Ha, 1.28 Mg / Ha and 1.2 Mg / Ha. As for the proportion of carbon stock values found in mangrove forests that trees contribute greatly to total carbon stock. Keyword : Mangrove, carbon stocks, Merauke, Kumbe
Mangroves are plants that live in tidal or interface areas between terrestrial and marine ecosystems in tropical and subtropical regions. Mangrove ecosystem is one of the coastal ecosystems that have a very important role, especially for organisms, namely as a supplier of nutrients produced by mangrove litter. An observation regarding litter productivity is still limited in Papua, especially in the city of Merauke. The method used in this study is the transect method, using 3 (three) transects. Mangrove litter is taken by using a litter trap container placed under the mangrove tree. The results obtained from litter production in each transect are as follows transect 1 of 167.8 g/m²/Month, Transect 2 of 65.4 g/m²/Month, and Transect 60 g/m²/Month while density mangrove in each transect 1 transect has a higher tree density value of 65 Ind/ m² while in Transect 2 it has a total litter production of 32 Ind / m² and the mangrove density value in Transect 3 is lower compared to stations 1 and 2 which are 25 Ind/m².
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