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Wilayah pesisir Bedono sebagai kawasan hutan bakau yang terletak di utara Kabupaten Demak telah dikelola dan dijadikan kawasan wisata sehingga secara tidak langsung akan berdampak terhadap fungsi ekologis mangrove. Banyak organisme hidup yang berasosiasi dengan mangrove salah satunya adalah Gastropoda. Tujuan dari penelitian ini adalah mengetahui jenis Gastropoda, kelimpahan dan keanekaragaman Gastropoda serta mengetahui hubungan antara kandungan bahan organik dengan kelimpahan Gastropoda. Pengambilan sampel Gastropoda dan sedimen dengan metode kuadran transek yaitu 1 x 1m di 3 stasiun. Hasil penelitian didapatkan terdiri dari 5 genera Gastropoda yaitu C assidula sp, Cerithidae sp, Littorina sp, Telescopium sp, dan Terebralia sp. Kelimpahan Gastropoda berkisar antara 94 – 248 ind/3m 2 . Nilai indeks keanekaragaman sebesar 1,08 - 1,27. Nilai indeks keseragaman sebesar 0,67 – 0,94 dan indeks dominasi sebesar 0,23 – 0,39. Berdasarkan nilai uji regresi sederhana dimana nilai koefisien korelasi berkisar 0,7 < r ≤ 1,0 menunjukkan bahwa kelimpahan gastropoda memiliki hubungan yang kuat dan memiliki korelasi dengan kandungan bahan organik dalam sedimen. ABSTRACT Bedono coastal as an area mangrove forest located at the northen Demak Regency has been managed and use d as a tourism area. Many living organisms associated to mangrove, mainly Gastropods. Purpose the research a to investigate type of Gastropods, abundance and diversity of Gastropods and relationship of organic matters to Gastropods abundance. Samples of Gastropods and sediments were collected using 1x1m transect quadrant methods in 3 different stations. Results of research obtained 5 genera of Gastropods that is Cassidula sp, Cerithidae sp, Littorina sp, Telescopium sp, dan Terebralia sp. Abundance of Gastropods between 94 – 248 ind/3m 2 . Result of diversity index was 1,08 – 1,27. Uniformity index between 0,67 – 0,94 and domination index was 0,23 – 0,39. Based on simple regression test the value of a correlation range 0,7 < r ≤ 1,0. It was showed that gastropods abundance have a close relationship and a correlation with organic matters in sediments . |
