The Existence of Intertidal Gastropods in Malalayang Beach, North Sulawesi
DOI:
https://doi.org/10.35800/jip.1.3.2013.2571Abstract
ABSTRACT
This study aims to determine the density, relative density and patterns of distribution of gastropods and diversity index gastropod community in the intertidal Malalayang Beach (behind Minanga Hotel), North Sulawesi. Gastropods sampling using quadratic size 0.5x0.5 m2 placed systematically and proportionally on dead coral sandy substrate mix mud, rocks slightly sandy substrate and substrate-sized stones. The results found have been changes in the number of species of the 30 species of gastropods (Manginsela, 1998) now to only 15 species. While the density of intertidal Malalayang gastropods contained 0,13 and the current range of 0.06 - 0.13 individu/m2 and relative density ranged from 2%-38.5%. Diversity index contained in the intertidal gastropod dead coral layered thin smear highest H' = 2.412 following the rocky region is H' = 2.232, and the lowest in the region b is H' = 2.059. Dispersal patterns in the intertidal gastropod are all randomized except Cypraea felina the distribution pattern of the group.
Keywords : gastropod, distribution
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ABSTRAK
Penelitian ini bertujuan mengetahui kepadatan, kepadatan relatif dan pola penyebaran dari masing-masing jenis gastropoda serta indeks keanekaragam komunitas gastropoda di intertidal Pantai Malalayang (di belakang Minanga Hotel), Propinsi Sulawesi Utara. Pengambilan contoh gastropoda menggunakan kuadrat ukuran 0.5x0.5 m2 yang ditempatkan secara sistimatis dan proporsional  pada substrat karang mati berpasir campur lumpur, substrat bebatuan sedikit berpasir substrat batu-berukuran. Hasil penelitian menemukan telah terjadi perubahan jumlah spesies gastropoda dari 30 spesies (Manginsela, 1998) menjadi hanya 15 spesies. Sedangkan kepadatan gastropoda yang terdapat di intertidal pantai Malalayang dari berkisar 0,13 individu/m2 saat ini 0,06-0,13 individu/m2 dan kepadatan relatif berkisar 2% - 38,5%. Indeks keanekaragaman gastropoda yang terdapat di intertidal karang mati berlapis lumpur tipis tertinggi adalah H’ = 2,412 menyusul kawasan berbatu adalah H’ = 2,232 serta terendah kawasan pada kawasan b adalah H’ = 2,059. Pola penyebaran gastropoda di intertidal ini semuanya acak kecuali Cypraea felina yang pola penyebarannya kelompok.
Kata kunci : gastropoda, distribusi
1 Bagian dari skripsi
2 Mahasiswa Program Studi Manajemen Sumberdaya Perairan FPIK-UNSRAT
3 Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi
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