Ohee HL, Sujarta P, Br Surbakti S, Barclay H. 2018. Rapid expansion and biodiversity impacts of the red devil cichlid (Amphilophus labiatus, Günther 1864) in Lake Sentani, Papua, Indonesia. Biodiversitas 19: 2096-2103. The red devil cichlid (Amphilophus labiatus, Günther 1864) is one of ten exotic fish species inhabiting Lake Sentani. It is believed to be one of the most important threats to the native fish of Lake Sentani. This study aimed to document the distribution of red devil cichlids and the impacts of this species on native fish fauna. Fish were sampled in six locations in Lake Sentani using gill nets during February and March 2018. Fish species and abundance were recorded and used to calculate the relative abundance, dominance, species evenness, Shannon Wiener Index (H’) and the correlation between introduced and native fish species. A total of 836 fish belonging to 12 species were recorded across Lake Sentani. Mean fish diversity (H’=0.57) and evenness (E= 0.25) were low. The red devil cichlid is the most abundant fish recorded during our surveys (87.2% of total fish collected) and is now the most dominant fish in the lake (C=0.76). Moreover, it has colonized all areas sampled within the lake because of its ability to colonize new habitat and to successfully exploit a large diversity of trophic niches. However, Amphilophus labiatus was not found to be significantly correlated to native fish between different sites in Lake Sentani. The existence of endemic and native fish in Lake Sentani is now seriously threatened by the presence of the red devil cichlid throughout this lake.
Biodiversity knowledge is widely heterogeneous across the Earth's biomes. Some areas, due to their remoteness and difficult access, present large taxonomic knowledge gaps. Mostly located in the tropics, these areas have frequently experienced a fast development of anthropogenic activities during the last decades and are therefore of high conservation concerns. The biodiversity hotspots of Southeast Asia exemplify the stakes faced by tropical countries. While the hotspots of Sundaland (Java, Sumatra, Borneo) and Wallacea (Sulawesi, Moluccas) have long attracted the
Ohee HL. 2016. Freshwater fish diversity in an oil palm concession area in Mimika,. New Guinea's freshwater fish diversity may reach 400 species, twice the number of fish recorded in Australia. However, New Guinea's freshwater fishes are facing rapid and poorly-planned social and economic developments, which have accelerated both habitat loss and degradation, impacting its unique biodiversity and threatening natural ecosystems. This study documents freshwater fish diversity and threats due to habitat conservation from oil palm development in the Timika Region, Papua. Fishes were sampled in canals, creeks, streams and rivers in the concession area of Pusaka Agro Lestari Company (PT. PAL) using seine and hand nets and a spear gun. Twenty two freshwater fish species in 15 families and 15 genera were recorded from the area. One of them is an endemic species of Timika (Glossamia timika), one rainbowfish species with a restricted Southern New Guinea distribution, and 12 other native fishes. Land clearing leads to increase water turbidity and sedimentation, water temperature, and pollution which are potential threats to native fishes and their habitats.
Papua has a potensial marine resources both in ecology aspect as well as in economic. To keep the richness of marine resources, conservation is needed. Tiyaitiki is a traditional conservation based on indigenous knowledge of local people of Teluk Tanah Merah Depapre Jayapura. They used their custom to conserve both the water areas and the natural resources as well. The aims of the study were to observe the diversity of plankton and fishes in Teluk Tanah Merah, and to know the quality of water based on that diversity. Research was conducted from July to August 2007. Line transect method was used in this study. Datawere collected from three station, at morning, noon, dawn and night separately.The result of the study were 38 genera of plankton, 21 genera of fithoplankton and 17 genera of zooplankton. Moreover, the result of fish diversity survey was 62 species. Those indicated that the water areas in Teluk Tanah Merah Depapre was in a good qualityfor fish life. Key words: plankton, fish, Tiyaitiki, Jayapura, Papua
Penelitian ini bertujuan untuk mengetahui komposisi vegetasi dan pemanfaatan ekosistem mangrove di Kawasan Wisata Alam Teluk Youtefa, Kota Jayapura. Pengumpulan data lapangan dilakukan pada bulan Juli sampai Agustus 2015 yang terdiri dari tiga stasiun penelitian, yaitu Kampung Enggros, Kampung Tobati, dan Kampung Nafri. Teknik pengumpulan data yang digunakan adalah survey, wawancara, dan point center quarter. Hasil penelitian menunjukkan bahwa mangrove yang ditemukan di Kampung Enggros, Kampung Tobati dan Kampung Nafri adalah 10 jenis mangrove yang terdiri dari 7 jenis mangrove sejati (Acrosticum spesiosum, Avicennia alba, Bruguiera cylindrica, Ceriops decandra, Rhizophora apiculata, Sonneratia alba, Xylocarpus menkongensis) dan 3 jenis mangrove asoasiasi (Casuarina sp., Derris trifolia, Pandanus tectorius). Kerapatan relatif R. apiculata tertinggi di Kampung Enggros dan Tobati (42,5% dan 75,0%), sedangkan kerapatan relatif A. alba tertinggi di Kampung Nafri (45,95%). R. apiculata memiliki frekuensi tertinggi di Kampung Enggros, Tobati dan Nafri (42,5%, 75,0% dan 45,95%). A. alba dan R. apiculata memiliki frekuensi relatif tertinggi di Kampung Nafri (45,95%). Tingkat dominansi tertinggi adalah R. apiculata di Kampung Enggros (49,69%) dan Kampung Tobati (73,03%), sedangkan A. alba di Kampung Nafri (52,21%). Indeks nilai penting tertinggi ditemukan di Kampung Tobati untuk jenis R. apiculata 223,03%. Pemanfaatan mangrove oleh masyarakat di Kampung Enggros Tobati dan Nafri sebagai kayu bakar, bahan bangunan, bahan obat-obatan, bahan pengawet jaring, serta bahan dempul dan cat perahu. Biota laut yang dimanfaatakan sebagai bahan makanan yaitu ikan (4 jenis), kepiting (3 jenis) dan kerang (5 jenis).Kata Kunci: Komposisi vegetasi; Pemanfaatan mangrove; Masyarakat lokal Papua; Taman Wisata Alam; Teluk Youtefa
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