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All Journal JURNAL ILMIAH PLATAX Jurnal Kelautan Tropis
Retraubun, Alex S.W.
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Environmental Science

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The Species Composition and Density of Uca spp. at Passo Mangrove Ecosystem, Ambon City Siahainenia, Laura; Retraubun, Alex S.W.
Jurnal Ilmiah Platax Vol. 11 No. 2 (2023): ISSUE JULY-DECEMBER 2023
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v11i2.50732

Abstract

The violin crab Uca spp. is a benthic organism that has an ecological role in the mangrove ecosystems. Passo mangrove ecosystem is degraded which can threaten the existence of violin crabs. The study was held in May-June 2023 to analyze the species composition and density of violin crabs. The results of the study can be used as basic data for the violin crabs and their habitat management. The study was conducted at 3 stations using the purposive sampling method. Sampling of violin crabs and substrate structures at each station was carried out at the lowest low tide using the plot method randomly. Data of violin crab species were calcified based on taxon. Data of substrate are classified by presentation of each fraction. Seven species of violin crabs are found in the study namely U. annulipes, U. perplexa, U. vocans, U. mjorbergi, U. lactea, U. dussumieri, and  U. vomaris. The total density of violin crabs ranges from 8.1-29.9 ind/m2. The total highest density of violin crab is found in station 1 and lowest at station 2. Species densities differ between stations. The highest species density is U. perlexa (1.4–10.2 ind/m2), and the lowest is U. vomeris (0.0-2.1 ind/m2). Keywords: Uca spp., Mangrove,  Habitat,  Passo Abstrak Kepiting biola Uca spp. merupakan organisme bentik yang memiliki peranan ekologi pada ekosistem mangrove. Ekosistem mangrove Passo mengalami degradasi yang dapat mengancam keberadaan kepiting biola. Penelitian dilakukan pada bulan Mei - Juni 2023, yang bertujuan untuk menganalisis komposisi spesies dan kepadatan kepiting biola. Hasil penelitian dapat digunakan sebagai data dasar bagi pengelolaan kepiting biola dan habitatnya. Penelitian dilakukan pada 3 stasiun yang ditetapkan menggunakan  metode purposive sampling. Sampling kepiting biola dan struktur substrat pada tiap stasiun dilakukan saat surut terendah menggunakan metode plot yang ditempatkan secara acak. Data spesies kepiting biola dikalsifikasikan berdasarkan takson. Data fraksi substrat diklasifikasikan berdasarkan presentasi berat tiap fraksi. Selama penelitian ditemukan 7 spesies kepiting biola yaitu U. annulipes, U. perplexa, U. vocans, U. mjorbergi, U. lactea, U. dussumieri, dan Uca vomaris. Kepadatan total kepiting biola berkisar antara            8,1-29.9 ind/m2. Kepadatan total tertinggi pada stasiun 1 dan terendah pada stasiun 2. Kepadatan spesies berbeda antar stasiun penelitian. Spesies dengan kepadatan tertinggi adalah U. perlexa (1,4-10,2 ind/m2). Spesies dengan kepadatan terendap yaitu U. vomeris (0,0-2,1 ind/m2). Kata kunci: Uca spp., Mangrove,  Habitat,  Passo  
Spatial Distribution and Gastropod Associations Based on Tawiri and Tanjung Tiram Mangrove Habitat in Ambon, Maluku, Indonesia Simatupang, Candida Putri Nauli; Bengen, Dietriech G.; Retraubun, Alex S.W.; Ismet, Meutia Samira; Abrahamsz, Jodie G.
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.23812

Abstract

Ambon Island is an area that has the potential for a mangrove ecosystem. Ambon Island has a unique bay covered with mangroves. When viewed from the topography, Ambon Bay is divided into Outer Ambon Bay and Inner Ambon Bay, which are separated by a narrow and shallow threshold. Tawiri has five species of mangroves, and Tanjung Tiram has three species of mangroves.  The density of mangroves as the main constituent of the ecosystem greatly influences the existence of associated biota, namely gastropods themselves. Gastropods have an important role in the food chain cycle in the mangrove ecosystem. This research was conducted in August–September 2023 in the Tawiri (Outer Ambon Bay) and Tanjung Tiram (Inner Ambon Bay) mangrove areas. Data collection for gastropods and mangrove ecosystems used quadrat transects, while for organic materials they used sediment cores. The association between gastropods and mangroves was analyzed using correspondence analysis (CA). The research results show that Tawiri has seven families and 10 species of gastropods. Tanjung Tiram has 3 families and 5 species of gastropods. Gastropod species at both study locations were divided into three different size classes for each location. Gastropods at each research location were found to be closely associated with mangroves because mangroves provide sufficient food sources for gastropod life. The results of this research can be useful for providing the latest data regarding the distribution of gastropods and mangroves in Tawiri and Tanjung Tiram.
Co-Authors Abrahamsz, Jodie G. Dietriech Geoffrey Bengen Meutia Samira Ismet Siahainenia, Laura Simatupang, Candida Putri Nauli