Diversity And Dominance Species Of Benthic Gastropod In Three Coastal Condition West Bali National Park

Abstract

The aim of this research was to determine the composition, domination, and diversity of benthic gastropod in three coastal condition of West Bali National Park, Province Bali. This research conducted with transect method. The research datas were raised at three location with different type of substrate, there are Prapat Agung Beach, Karang Sewu Beach, and Cekik Beach. The substrate type was rough sand, cobble, and smooth sand. Every location has two transect which is upright the contur and then has a few plot too with the measure of every plot is 1 m2. The interval for every transect is 100 m, while for every plot is 10 m. Ponar dredge was use to raised benthic gastropod. Identification of benthic gastropod was refer to identification key. The result of this research showed that 25 species from 14 family of gastropod founded at three coastal condition. Euplica scripta was dominated in the first location with index of domination is 57,14%, Terebralia palustris was dominated in the second location with index of domination is 93,46%, and Hastula hectica was dominated in the third location with index of domination is 100%. According to the result, we can conclude that composition, domination, and diversity of benthic gastropod are interrelated with substrate type of the coastal.Penelitian ini diarahkan untuk mengetahui komposisi, dominansi, dan tingkat keanekaragaman gastropoda bentik di tiga kondisi pantai wilayah Taman Nasional Bali Barat, Provinsi Bali. Sampel gastropoda bentik diperoleh dengan metode transek. Data gastropoda bentik diambil pada tiga lokasi pantai dengan tipe substrat yang berbeda yaitu Pantai Prapat Agung, Pantai Karang Sewu, dan Pantai Cekik secara berturut – turut mewakili tipe substrat pasir kasar, batuan dan pasir halus. Pada setiap lokasi dibuat dua transek yang tegak lurus kontur dengan beberapa plot berukuran 1 m2. Jarak antar transek 100 meter dan antar plot 10 meter. Setiap plot dilakukan ekstraksi dengan Ponar Dredge untuk memperoleh gastropoda bentik. Identifikasi gastropoda bentik menggunakan buku kunci identifikasi. Hasil penelitian ini menunjukkan adanya 25 spesies dari 14 famili gastropoda yang ditemukan di tiga kondisi pantai. Euplica scripta mendominasi di lokasi satu sebanyak 57,14%, Terebralia palustris mendominasi di lokasi dua sebanyak 93,46%, dan Hastula hectica mendominasi pada lokasi tiga sebanyak 100%. Komposisi dominansi dan tingkat keanekaragaman gastropoda bentik sangat berhubungan dengan substrat di tiga kondisi pantai