Blood clams community (Anadara granoasa) in The Eastern Coastal Waters of Banyuasin Regency South Sumatera

Abstract

This research aimed to study existence of blood clams population and the environmental factors that affect them. This research was conducted in the coastal waters of Banyuasin in February 2015. The blood clamp sample was collected using Ekman Grab at low tide. From the observation in the research site, the highest population density was 60 ind/m2 with clay substrate texture, while the lowest density was 20 ind/m 2 on the dusty clay substrate. Blood clams population was not found on the sand substrate texture station. Morphometric data showed that the blood clam population in the research site, including the medium category with b < 3 growth pattern (allometric negative). The results of PCA analysis proved that the habitat texture and sediment organic habitats were dominant factors besides the chemical physics environmental factors of the waters (temperature, salinity, pH). Keywords: Blood clams, density, morphometric, PCA Abstrak (Indonesian):Penelitian ini bertujuan untuk mempelajari keberadaan populasi kerang-darah dan faktor lingkungan yang mempengaruhinya. Penelitian ini dilakukan di perairan pesisir Banyuasin pada bulan Februari 2015. Sampel kerang-darah diambil dengan menggunakan Ekman Grab pada saat air surut. Dari hasil pengamatan pada lokasi penelitian, kepadatan populasi kerang-darah tertinggi adalah 60 ind/m 2 dengan tekstur substrat lempung, sedangkan kepadatan terendah adalah 20 ind/m2 pada substrat lempung berdebu. Populasi kerang-darah tidak ditemukan pada stasiun dengan tekstur substrat pasir. Data morfometrik menunjukkan bahwa populasi kerang-darah di lokasi penelitian termasuk kategori sedang dengan pola pertumbuhan b < 3 (allometrik negatif). Hasil analisis PCA membuktikan bahwa tekstur habitat dan bahan organik sedimen merupakan faktor dominan di samping faktor lingkungan fisika kimia perairan (suhu, salinitas, pH).

Population dynamics of blood clams Tegillarca granosa in Kendari Bay, Southeast Sulawesi, Indonesia

“…Furthermore, they are widely distributed in the world (Pathansali 1964;Yoloye 1974;Broom 1983;Mirzaei et al 2014), including all coastal waters in Southeast Asia which are found in Indonesia (Setianingsih et al 2016;Devi et al 2019;Yulinda et al 2020;Ukhrowi et al 2021), Malaysia, Thailand, the Philippines, andVietnam (Vijayanathan et al 2012;Yurimoto et al 2014). These clams are abundant in habitats with clay, silt, and high organic matter/detritus substrates (Ramli et al 2015;Setianingsih et al 2016;Yurimoto et al 2021). They also provide ecological benefits by improving water quality and the food chain cycle in bay waters (Komala and Zahara 2020).…”