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Substrate Complexity Drives Hermit Crab (Diogenidae) Diversity and Ecological Flexibility Across Sand, Rubble, and Coral Habitats in Tarahan Island, Indonesia Santoso, Prakas; Nurseha, Melly; Rini, Chentia A.; Budi, Arief; Aurora, Hanisya; Zaidaniansyah, Muhammad A.; Hasanah, Afifah N.; Anggraini, Nurlita P.; Budiman, Aziz; Jasmine, Agitha S.; Siregar, Raissha A.; Amri, Ulil
Aceh Journal of Animal Science Vol 10, No 2 (2025): June 2025
Publisher : Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/ajas.10.2.46497

Abstract

Research on the role of benthic substrates in shaping hermit crab communities along coastlines remains relatively limited, despite the important role this group plays in coastal benthic ecosystems. This study counducted in April 2025, aimed to examined the relationship between substrate characteristics sand, coral rubble, and coral reefs and the distribution and community structure of hermit crabs of the family Diogenidae along the northwestern coast of Tarahan Island, Indonesia. A total of 58 individuals consisting of 9 hermit crab species were identified across the three habitat types, with the highest species richness and abundance found in the rubble habitat, which exhibited high porosity and microhabitat heterogeneity. Community analysis using ANOSIMS showed R value of -0.002 and a p-value of 0.48 revealed an overlap in species composition among habitat types however, SIMPER analysis certain species such as Clibanarius striolatus consistently dominated habitats with high structural complexity, while others like Clibanarius signatus showed a specific preference for coral-sand habitats. This variation in habitat preference reflects a spectrum of ecological strategies, ranging from specialists to generalists, within the hermit crab community studied. The findings highlight the importance of substrate diversity and integrity in supporting the ecological flexibility, stability, and sustainability of hermit crab communities in dynamic coastal ecosystems
KARAKTERISTIK UPWELLING DI PERAIRAN SELATAN JAWA PADA TAHUN STRONG LA NINA 2010 DAN SUPER EL NINO 2015 Atmadipoera, Agus S.; Jasmine, Agitha S.; Purba, Mulia; Kuswardani, Anastasia R.T.D.
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 12 No. 1 (2020): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1154.577 KB) | DOI: 10.29244/jitkt.v12i1.28977

Abstract

Upwelling pantai musiman di perairan Selatan Jawa diduga dapat dimodulasi oleh variabilitas antar-tahunan laut-atmosfer El Nino Southern Oscillation (ENSO). Penelitian ini bertujuan untuk menganalisis perbedaan karakteristik upwelling musiman selama kejadian La Nina 2010 dan El Nino 2015, berdasarkan multi-dataset dari keluaran model INDESO dan dari data satelit. Karakteristik yang berbeda dari upwelling musiman terlihat jelas. Di La Nina, variabel laut-atmosfer permukaan jauh lebih rendah daripada yang diamati di El Nino, kecuali untuk tingkat curah hujan, suhu permukaan laut, dan tinggi permukaan laut. Di La Nina, air laut yang lebih hangat (27-28°C) dan lebih tawar (<33,80psu) mendominasi di atas lapisan kedalaman 45m, yang menahan air dingin upwelling tetap di bawah permukaan. Sebaliknya, di El Nino, air bawah permukaan naik secara drastis dari isoterm 25-26°C dan isohalin dari 34,24-34,44psu tersingkapkan di permukaan laut. Indeks upwelling berbasis suhu adalah -2°C dan +4°C, menunjukkan ENSO telah sangat memodulasi intensitas upwelling. Arus Pantai Selatan Jawa (SJCC) yang kuat mengalir kearah timur hanya ditemukan pada kejadian La Nina. Aliran Arlindo yang persisten di selatan 9,5°S terlihat pada ENSO berbeda. Perkiraan angkutan Ekman yang diturunkan dari model arus meridional telah diintervensi secara kuat oleh kehadiran SJCC dan Arlindo.