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.
Remote sensing is a technique that can be applied for observing oceanographic paramaters such as content of sea surface temperature and chlorophyll-a. The study aims to analyze the parameters of Sea Surface Temperature and Chlorophyll-a by using Aqua Modis Satellite to see the spatial and temporal distribution of the two paramaters on the distribution of CPUE of Mackerel (Scomberomorus commerson).Conducted for 2 months from May-June 2019 this study was held in the waters area of Naukenjerai District, Merauke Regency. The results showed the concentration of sea surface temperature in May was warmer in the range of 26.56 – 28.42 °C compared to June, where the temperature was cooler in the range of 25.43 – 26.94 °C. Meanwhile the concentration of chlorophyll-a in May was seen to be low around 0.3-1.73 mg/m3 which compared to June the concentration was relatively high around 1.45-2.36 mg/m3. The highest distribution of CPUE of Mackerel was found in June, which was 89 kg and the lowest CPUE Mackerel in May was around 22 kg. Therefore in June there is a great potential for capturing Mackerel.
Species identification is one of the most basic and important factors in fisheries management. Oreochromis sp., such as tilapia (Oreochromis mosambicus) and tilapia (Oreochromis niloticus) are introduced species of fish originating from outside Merauke which are now the dominant fish and are commonly found in inland waters of Merauke. The purpose of this study was to identify the economically important fish species Oreochromis sp. which landed at Merauke Traditional Market with DNA Barcoding approach. DNA amplification with the COI gene resulted in a DNA sequence length of 655 bp with the identification result being Tilapia (Oreochromis niloticus). Based on the phylogenetic tree data and genetic distance, the DNA sequences of the samples formed the same clade as the Oreochromis niloticus sequences from GeneBank with 0% genetic distance and it was estimated that these species came from the same parents. Identification with DNA Barcoding makes it easy to identify species quickly and accurately.
The purpose of this study was to analyze the regeneration potential of mangroves found on the coast of Payum, Merauke Regency, Papua Province. This research was conducted in August-October 2018. The data collection technique was purposive sampling using Transect Line Plots. The sampling location was chosen based on the representation of the presence of mangroves in three locations, namely zones A, B and C. The results of this study explained that there were three tree-level mangrove species, namely Avicennia alba, Rhizophora apiculata and Sonneratia alba. Type A. alba dominates in zone A with an important value index (INP) of 205.76%, zone B does not have a certain type that dominates, while Rhizophora apiculata dominates in zone C with INP 185.35%. The potential of the three mangrove species in zones A, B and C is good. Aegialitis annulata species are only found in sapling and seedling levels. In zones A and B are classified as new while in zone C is classified as bad. This study concluded that Avicennia alba, Rhizophora apiculata and Sonneratia alba had the potential to regenerate in all three locations (Zones A, B and C) compared to Aegialitis annulata.
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