Granulometric and Bioindex Analysis of Macrobenthos in Malalayang Coastal Waters

Abstract

The purpose of this study was (1) to describe macrozoobenthos and calculate and analyze bio-indexes including density, diversity, domination, and proprietary macrozoobenthos genus found on the beach of Malalayang. (2) inform the condition of habitat sediment granulometry and related to various macrozoobenthos bio-indexes found on the Malalayang Beach. The results of the identification of macrozoobenthos types obtained from the entire research station have obtained macrozoobenthos taxa covering 3 classes, namely: Gastropoda classes include 5 genera, namely Melanella, Margarites, Frigidoalvania, Oenopot, and Cylichna, Crustacean class (2 genera: Pagurus and Hemigrapsus) and Polychaeta classes ( 1 genus: nais). Macrozoobenthos density at Station 1 and Station 3. Overall, station 1 has the highest average density of 29.33 ind./m2; Furthermore, Station 3 has an average density of 23 indv. /m2; And finally Station 2 with a density of 17.67 Ind. /m2. Based on the results of the test, it was concluded that none of the values of the macrozoobenthos diversity index at the research site showed that the H1 acceptance or can be said that the results of the t-test stated that all the recatient research tests were not significantly different meaning the diversity of the entire station tested had the same diversity. The dominance index also obtains values that indicate the condition of the lack of dominance from certain macrozoobenthos genera at the research location.The volume index is obtained that the community is in a stable condition only found at Station 3, namely the rear graduation area in the Malalayang River estuary. Communities that are in depressed conditions are found in the graduation land of station 1 and station 3, as well as the rearstal land of station 2. Other areas obtained by the community are in unstable conditionsThe sediment composition that looks for files to stations at the research site displays diverse conditions. In general, through the graph of the sediment composition produced, at station 1 can be said to have decreased grain size towards land. Physical at Station 2, on the contrary, experienced an increase in a more rough (gravel) sediment on the middle and rear land, and at station 3, the center of the center looks composed of sediments that have a rough size.Keywords: intertidal; macrobenthos; sediment AbstrakTujuan penelitian ini adalah (1) Mendeskripsikan makrozoobenthos serta menghitung dan menganalisis bioindeks meliputi kepadatan, keanekaragaman, dominasi, dan kemerataan genus makrozoobenthos yang terdapat di Pantai Malalayang. (2) Menginformasikan kondisi granulometri sedimen habitat dan kaitannya dengan berbagai bioindeks makrozoobenthos yang terdapat di pantai Malalayang. Hasil identifikasi jenis-jenis makrozoobenthos yang diperoleh dari keseluruhan stasiun penelitian telah diperoleh taksa makrozoobenthos meliputi 3 kelas yaitu: Kelas Gastropoda meliputi 5 Genera yakni Melanella, Margarites, Frigidoalvania, Oenopotadan Cylichna, Kelas Crustacea (2 Genus: Pagurus dan Hemigrapsus) dan Kelas Polychaeta (1 Genus: Nais).Kepadatan makrozoobenthos pada Stasiun 1 dan Stasiun 3, Secara keseluruhan, Stasiun 1 memiliki rata-rata kepadatan tertinggi yaitu sebesar 29,33 ind./m2; selanjutnya Stasiun 3 memiliki kepadatan rata-rata 23 ind./m2; dan terakhir Stasiun 2 dengan kepadatan 17,67 ind./m2.Berdasarkan hasil uji_t diperoleh kesimpulan bahwa tidak ada satupun dari nilai indeks keanekaragaman makrozoobenthos pada lokasi penelitian menunjukkan terima H1 atau dapat dikatakan hasil uji-t menyatakan bawha semua satisun penelitian yang di uji tidak berbeda nyata artinya keanekaragaman seluruh stasiun yang diuji mempunyai keanekaragaman sama. Indeks Dominansi juga memperoleh nilai-nilai yang menunjukkan kondisi tidak adanya dominasi dari genus makrozoobenthos tertentu pada lokasi penelitian.Indeks kemerataan diperoleh bahwa komunitas berada dalam kondisi stabil hanya terdapat pada Stasiun 3, yaitu area lahan gisik bagian belakang di muara Sungai Malalayang. Komunitas yang berada dalam kondisi tertekan, terdapat pada lahan gisik bagian depan Stasiun 1 dan Stasiun 3, serta lahan gisik bagian belakang Stasiun 2. Area lainnya diperoleh komunitas berada dalam kondisi yang labilKomposisi sedimen yang menghampari gisik pada stasiun-stasiun di lokasi penelitian menampilkan kondisi yang beragam. Secara umum, melalui grafik komposisi sedimen yang dihasilkan, pada Stasiun 1 dapat dikatakan terjadi penurunan ukuran butir ke arah darat. Gisik pada Stasiun 2, sebaliknya mengalami peningkatan sedimen berukuran lebih kasar (kerikil) pada lahan bagian tengah dan belakang, dan pada Stasiun 3, gisik bagian tengah tampak tersusun oleh sedimen yang memiliki ukuran kasar. Kata Kunci: intertidal; makrobenthos; sedimen

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