Abstrak

Kawasan mangrove Desa Pagatan Besar memiliki berbagai jenis vegetasi mangrove, jenis biota serta pemandangan dan bentang alam yang luas. Salah satu kelompok fauna avertebrata yang hidup di ekosistem mangrove ialah moluska, yang didominasi oleh kelas bivalvia dan gastropoda. Bivalvia umumnya hidup membenamkan diri pada substrat dan bisa dimanfaatkan sebagai indikator pencemar.

Parameter kualitas lingkungan serta ketersediaan makanan sangat berpengaruh untuk mendukung kehidupan bivalvia. Banyak sedikitnya keanekaragaman dan kelimpahan bivalvia yang dipengaruh oleh faktor lingkungan. Penelitian ini menggunakan data bivalvia, mangrove dan parameter kualitas lingkungan. Analisis data meliputi keanekaragaman dan kelimpahan bivalvia, kerapatan mangrove, kualitas lingkungan serta hubungan kerapatan mangrove dengan kelimpahan bivalvia. Keanekaragaman tertinggi yaitu pada stasiun satu ditemukan 6 jenis spesies, sedangkan  keanekaragaman terendah yaitu pada stasiun tiga. Kelimpahan tertinggi pada stasiun dua dan kelimpahan terendah pada stasiun tiga. Kerapatan mangrove stasiun satu dengan kriteria sangat padat, stasiun dua jarang dan untuk stasiun tiga sedang. Kualitas lingkungan di Desa Pagatan Besar kurang sesuai untuk kehidupan bivalvia karena substrat dan salinitas perairan terlalu rendah.  Adapun hubungan kerapatan mangrove dengan kelimpahan bivalvia termasuk kategori rendah.

Kata Kunci: Bivalvia,  Mangrove, Kualitas Lingkungan, Keanekaragaman, Kelimpahan.

Abstract

The mangrove area of Pagatan Besar Village has various types of mangrove vegetation, types of biota and extensive views and natural landscapes. One group of invertebrate fauna that lives in the mangrove ecosystem is molluscs, which are dominated by the bivalve and gastropod classes. Bivalves generally live buried in the substrate and can be used as indicators of pollution. Environmental quality parameters and food availability are very influential in supporting the life of bivalves. Much of the diversity and abundance of bivalves is influenced byenvironmental factors. This research uses data on bivalves, mangroves and environmental quality parameters. Data analysis includes diversity and abundance of bivalves, mangrove density, environmental quality and the relationship between mangrove density and bivalve abundance. The highest diversity was found at station one, 6 species were found, while the lowest diversity was at station three. The highest abundance was at station two and the lowest abundance was at station three. The mangrove density of station one is very dense, station two is rare and station three is medium. The environmental quality in Pagatan Besar Village is not suitable for bivalve life because the substrate and water salinity are too low. The relationship between mangrove density and bivalve abundance is in the low category.

Keywords: Bivalves, Mangroves, Enviromental Quality, Diversity,  Abundance.