Utami RT, Zamani NP, Madduppa HH. 2018. Molecular identification, abundance and distribution of the coral-killing sponge Terpios hoshinota in Bengkulu and Seribu Islands, Indonesia. Biodiversitas 19: 2238-2246. Coral killing sponge Terpios hoshinota is one of threats to coral reefs. The outbreaks of T. hoshinota has been reported in the Indo-Pacific region. However, the current distribution of this species in Western of Sumatera Island is unknown, compared to Seribu Islands. This study aimed to identify coral-killing sponge molecularly and to compare the distribution and abundance of T. hoshinota in Bengkulu (Western of Sumatera) and in Seribu Islands (Northern of Java Island) and to record the preferences of coral substrate of T. hoshinota. Coral reefs and T. hoshinota data were collected using underwater photo transect method with 0.5x0.5m2 quadrate transect. Coral reefs covered by T. hoshinota was analyzed by using Correspondence Analysis, while the determination of biophysical and chemical environment was analyzed by Principal Component Analysis. The identity of the sponge was T. hoshinota. T. hoshinota has been expanding in many reefs across Indonesia especially in Tikus Island and Belanda Island. The most prevalent coral genera in the Seribu Islands infected by T. hoshinota was Acropora while those in Bengkulu were Porites and Pocillopora. Pearson correlation between the live coral cover and T. hoshinota cover was revealed not significant, while T. hoshinota cover and orthophosphate was significant. This study suggests that orthophosphate may play a role invasion of T. hoshinota outbreaks.
Abstract. Kusnadi A, Kurnianto D, Madduppa H, Zamani NP, Ibrahim PS, HernawanU E, Utami RT, Triandiza T. 2022. Genetic diversity and population structure of the boring giant clam (Tridacna crocea) in Kei Islands, Maluku, Indonesia. Biodiversitas 23: 1273-1282. Giant clams (Tridacninae) are ecologically important species in the coral reef ecosystems. They provide valuable functionsto traditional fisheries in Kei Islands, Maluku. However, their population isunder great pressure due to anthropogenic threats, such as overfishing and habitat degradation. To provide important data for devising effective conservation management strategies for giant clams, we investigated genetic diversity and population structure of the boring giant clams Tridacna croceain Kei Islands based on partial mitochondrial COI gene sequence. Tissue samples were collected from six sites: Kur, Dullah Laut, Tanimbar Kei, Dar, Labetawi, and Difur. We sequenced 477 base pairs of COI gene and identified 42 haplotypes and 52 polymorphic sites. Analysis of genetic diversity showed Dullah Laut and Dar had the highest genetic diversity. Population structure and genetic distance analysis showed unstructured populations with high genetic closeness among sites. This finding was also confirmed by the mixture pattern of the haplotype network. Further analysis using Bayesian models on gene flow revealed high genetic exchange among sites and that Dullah Population predominantly served as a source site for the other sites. This indicated a high probability of successful larval dispersal among sites. Based on these findings, we predict that the boring giant clams likely form a single population in Kei Islands. Our study warrants conservation priority for Dullah population as the main source of gene flow.
Realizing a Tourism Village through Provision of Clean, Health, Safety & Environment, Excellent Service and Exploring, Packaging & Presentation Sumber Urip Village, Selupu Rejang District, Rejang Lebong Regency is one of the tourist villages in Bengkulu Province that requires tourism development. The Ministry of Tourism and Creative Economy of the Republic of Indonesia in collaboration with Universitas Prof. Dr. Hazairin, SH Bengkulu held the development of Regional Tourism Village 1 A (Sumatra) with the aim of providing understanding to participants about the importance of implementing clean, health, safety & environment, excellent service and explore, packaging & presentation in building a tourist village. Another goal was to increase the tourism awareness movement so that it could develop the cultural and tourism potential that exists in tourist villages. The activity was carried out on September 8, 2020 and continued with assistance in Sumber Urip Village. The technical guidance was attended by 25 participants from tourism-aware community groups, village-owned enterprises, village officials and assistants from students. Overall, the activity was successful and received a positive response from the participants. 100% of participants expressed satisfaction with the material about the development of tourist villages presented in this community service activity.
: Ekosistem mangrove memiliki potensi yang cukup besar dalam menyerap emisi karbon dari atmosfer. Karbon tersebut mampu tersimpan di dalam biomassa maupun sedimen, dan dikenal sebagai blue carbon. Meskipun demikian, degradasi mangrove dapat mengganggu potensi tersebut. Tujuan dari penelitian ini adalah untuk mengetahui struktur komunitas, biomassa permukaan (AGB), simpanan karbon biru vegetasi mangrove, serta kemampuan serapan karbon ekosistem mangrove yang telah mengalami degradasi di sepanjang pesisir Kabupaten Kolaka. Ekosistem mangrove di kawasan tersebut merupakan mangrove tepian (Fringe Mangrove), dan ketebalannya kurang dari 100 meter. Penelitian ini menggunakan metode transek kuadrat sejajar garis pantai. Sebanyak 5 plot berukuran 100m2 diletakkan disepanjang transek. Data yang dikoleksi di setiap plot berupa diameter batang (dbh), jenis, dan jumlah jenis. AGB diestimasi menggunakan persamaan allometrik yang telah dikembangkan oleh beberapa peneliti terdahulu. Sementara itu stok karbon diestimasi menggunakan data AGB dan konstanta karbon dari bahan organik. Hasil penelitian menunjukkan bahwa ekosistem mangrove di pesisir Kolaka tersusun atas 8 spesies mangrove. Kerapatan mangrove tertinggi berturut-turut stasiun 3 (2180 ind/ha; kategori baik), stasiun 4 (2160 ind/ha; kategori baik), stasiun 1 (1520 ind/ha; kategori baik), dan stasiun 2 (1160 ind/ha; kategori sedang). Total AGB untuk seluruh stasiun sebesar 1242,29 ton/ha dengan AGB tertinggi pada stasiun 4 (455,58 ton/ha). Total stok karbon vegetasi mangrove untuk seluruh stasiun yaitu sebesar 583,85 ton/ha, dengan stok karbon tertinggi terdapat pada stasiun 4 (214,11 ton/ha). Sementara itu, total serapan karbon untuk seluruh stasiun sebesar 1362,46 ton/ha, dengan serapan karbon tertinggi terdapat pada stasiun 4 (499,65 ton/ha). Nilai AGB berbanding lurus dengan nilai stok karbon dan serapan karbon. Mangrove ecosystem has a great potential to absorb carbon emission from atmosphere. Those carbon could be stored into the biomass as well as into the sediment, and it’s well known as blue carbon. Nevertheless, mangrove degradation could disturb those mangrove potential. The aims of this study were to knows the community structure, aboveground biomass (AGB), blue carbon stocks of mangrove vegetation, as well as the ability of carbon absorbtion of degraded mangrove ecosystem along Kolaka Coastal Line. The mangrove ecosystem at those areas was a fringe mangrove, and the mangrove thickness less than 100 meters. This study using quadratic transect method prependicular to the coastal line. 5 plots sized 100m2 were placed along transect line. The data were collected in each plot were stem diameter (dbh), species and total of species. The AGB were estimated using allometric equation that has been developed by previous researcher. Meanwhile, the carbon stock was estimated by using the AGB data and carbon constant value from organic matter. The results of this study showed that mangrove ecosystem of Kolaka coastal line constructed by 8 mangrove species. The highest mangrove density were station 3 (2180 ind/ha; good category), station 4 (2160 ind/ha; good category), station 1 (1520 ind/ha; good category), and station 2 (1160 ind/ha; medium category) respectively. The AGB total for all stations was about 1242,29 ton/ha, with the highest AGB was in the station 4 (455,58 ton/ha). The total of carbon stock of mangrove vegetation for all stations was about 583,85 ton/ha, with the highest carbon stock was in the station 4 (214,11 ton/ha). Meanwhile, the total of carbon absorbtion for all stations was about 1362,46 ton/ha, with the highest carbon absorbtion was in the station 4 (499,65 ton/ha). The AGB values has directly proportional to the carbon stock and carbon absorbtion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.