No abstract

Salah satu peran penting ekosistem lamun yaitu sebagai penyerap karbon yang berasal dari atmosfer. Pulau Bintan merupakan salah satu pulau dengan hamparan padang lamun yang cukup luas. Penelitian ini bertujuan untuk mengestimasi kandungan karbon pada padang lamun yang berasal dari seluruh jenis lamun dan sedimen yang berada di perairan Berakit dan Dompak Pulau Bintan. Penentuan potensi cadangan karbon dilakukan dengan melihat estimasi cadangan karbon di dalam sedimen dan biomassa lamun meliputi bagian atas (daun dan pelepah daun) dan bagian bawah lamun (rhizome dan akar). Pengukuran stok karbon pada sedimen lamun dilakukan dengan menggunakan metode pengabuan kering atau Loss on Ignation (LOI) dan kandungan karbon pada biomassa lamun diukur menggunakan metode konversi dengan konstanta. Hasil penelitian menunjukkan pada stasiun Berakit estimasi total cadangan karbon sedimen sebesar 91 Mg Corg ha-1 dan 10,58 Mg C/m2 untuk estimasi kandungan karbon lamun, sedangkan stasiun Dompak nilai estimasi total cadangan karbon pada sedimen berkisar103,80 Mg Corg ha-1 dan 3,34 Mg C/m2 untuk estimasi kandungan karbon bagian lamun. Kandungan karbon pada substrat dipengaruhi oleh komposisi sedimen dan kandungan karbon pada lamun dipengaruhi oleh kerapatan lamun.

Nugraha AH, Tasabaramo IA, Hernawan UE, Rahmawati S, Putra RD, Darus RF. 2021. Diversity, coverage, distribution and ecosystem services of seagrass in three small islands of northern Papua, Indonesia: Liki Island, Meossu Island and Befondi Island. Biodiversitas 22: 5544-5549. Papua waters are one of the hot spot areas with high marine biodiversity in the world. Yet, the less accessible location and varying geographical conditions become the significant constraints of biodiversity study in this region, resulting in limited information about the diversity of marine resources, including the seagrass ecosystem. This research aims to investigate the diversity, coverage and distribution of seagrass in three small islands in the northern waters of Papua, namely Liki Island, Befondi Island, and Meossu Island, as well as to study the ecosystem services provided by the seagrass. This research is part of the Nusa Manggala Expedition, which was carried out in November 2018, consisted of seven observation stations. Data collection was conducted using the transect line method combined with plot quadrat. Information regarding seagrass ecosystem services was gathered through observation and direct interviews to the community. The results showed that there were seven species of seagrass in the studied sites, namely Cymodocea rotundata, Enhalus acoroides, Halodule uninervis, Halodule pinifolia, Halophila ovalis, Thalassia hemprichii, and Syringodium isoetifolium. Liki Island had the highest seagrass cover value of 82.24%, followed by Meossu Island and Befondi Island with seagrass cover of 63.23% and 31.25%, respectively. There were 13 seagrass ecosystem services identified in this research. The people of Liki Island and Meossu Island get the benefits of the existence of the seagrass ecosystem. The direct benefits are the presence of seagrass is associated with biota commonly used as food sources such as Siganus sp and sea cucumbers. There are efforts made by the community to maintain the sustainability of the seagrass ecosystem, which is known as sasi.

Apriadi T, Pratama G, Putra RD, Jumsurizal, Jaya YV, Firdaus M, Arpas HD, Suryanti A. 2018. Comparative study on the fish diversity from natural and bauxite post-mining in wetland system of Bintan Island, Indonesia. Biodiversitas 19: 967-973. In this study, the fish populations between two different wetland systems in Bintan Island, Indonesia, i.e., bauxite post-mining (Kijang) and natural wetland (Toapaya) were compared and to propose a newly index namely Environomic of Fishes Index (EFI) to their respective ecosystems. The purposive random sampling at six stations, each of three stations representing bauxite mining (Kijang) and three stations representing a natural wetland (Toapaya) were used in this research. The numbers of fish species and the abundance were enumerated. The new index derived from the value of diversity index (Shannon), similarity index (Evenness), dominance index (Simpson's), conservation status, and economic value were also evaluated. The natural wetland has higher fish diversity than bauxite post-mining. The total species found were twenty-four. The same seven species were found in both areas. Twelve species were obtained from bauxite post-mining, and nineteen species were obtained from natural wetland. Puntius tetrazona and Rasbora heteromorpha were the common species in area study. The diversity and dominance index was at low category, Evenness index was at high category in all stations, except in tidal swamp station at bauxite post-mining. The EFI in natural wetland was higher than bauxite post-mining. The three community index value, economic value, and conservation status of natural wetland were higher than bauxite post-mining.