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Komposisi Jenis dan Kelimpahan Diatom Bentik di Muara Sungai Comal Baru Pemalang

1Program Studi Ilmu Kelautan, Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro. Kampus Tembalang semarang 50275 Telp./fax. 0247474698, Indonesia

2Program Studi Ilmu Kelautan, Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro. Kampus Tembalang semarang 50275 Telp./fax. 0247474698; e-mail: widia2506@yahoo.com, Indonesia

Received: 11 Feb 2012; Published: 12 Feb 2012.

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Abstract

Diatom bentik mempunyai peranan penting sebagai produsen primer dalam siklus karbon di rantai makanan estuaria, sebagai sumber makanan yang penting bagi hewan-hewan surface dwellers (merayap di permukaan) dan deposit feeder, juga berperan penting dalam stabilisasi sediment. Penelitian telah dilakukan di Muara Sungai Comal Baru Desa Mojo, Kecamatan Comal, Kabupaten Pemalang pada bulan Jamuari-Maret 2006 dengan tujuan menganalisa komposisi genus dan kelimpahannya. Sampel sedimen diambil menggunakan core sampler dengan ketebalan 1 cm pada enam stasiun berdasarkan jaraknya dengan laut.  Hasil penelitian menunjukkan bahwa di Muara Sungai Comal Baru telah ditemukan 20 genus diatom bentik yang termasuk dalam 17 famili dengan ordo Pennales lebih banyak dari pada centrales.  Jumlah genus dan kelimpahan total diatom bentik pada bulan Maret lebih tinggi daripada bulan Januari dan Februari karena pengaruh lingkungan antara lain kandungan bahan organik, nutrient  dan curah hujan.

Kata kunci: Diatom bentik, kelimpahan, komposisi genus, Sungai Comal Baru

 

Benthic Diatom play important role as primer producer in carbon cycle of estuarine food web, as food source for surface dwellers and deposit feeder as well as as sediment stabliziation. The objectives of this present work was to analize genera composition and abundance of benthic diatom. The work had been carried out in mouth of Comal Baru River, Mojo-Comal, Pemalang during January-March 2006. Benthic diatom in 1 cm depth sediment were taken with core sampler in six stations according to the distance from the beach.  The results showed that twenty genera od benthic diatom belongs to 17 family were found in mouth in mouth of Comal Baru River, Mojo-Comal in which order of penalles more than cenytrales.  The number of genera and their abundance were greater in March than January and February because of environment such a organic matter, nutrient and rainfall.

Key words: Benthic Diatom, abundance, genus composition, Comal Baru River

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