i
ABSTRAK
TRI WULANDARI.
Struktur Komunitas Makrozoobenthos di Kawasan Mangrove Desa Bagan Deli Kecamatan Medan Belawan. Di bawah bimbingan HESTI WAHYUNINGSIH dan AHMAD MUHTADI RANGKUTI.Aktivitas yang terjadi di kawasan mangrove Desa Bagan Deli Kecamatan Medan Belawan mengakibatkan terjadinya penurunan kualitas perairan sehingga menyebabkan perubahan kondisi ekologis terhadap kehidupan biota terutama makrozoobenthos. Penelitian ini bertujuan untuk mengetahui struktur komunitas makrozoobenthos dan kualitas perairan berdasarkan kurva Abundance and Comparison (ABC). Penelitian ini dilaksanakan di kawasan mangrove Desa Bagan Deli Kecamatan Medan Belawan dari bulan Maret sampai April 2016. Penentuan lokasi pengambilan sampel dilakukan dengan metode purposive random sampling pada 3 stasiun. Pengambilan makrozoobenthos dan pengukuran kualitas air dilakukan dengan rentang waktu 1,5 bulan. Hasil penelitian yang didapatkan 12 jenis makrozoobenthos yaitu Telescopium telescopium, Turritella terebra, Nassarius reeveanus, Cerithidea cingulata, Chicoreus capucinus, Nerita lineata, Cerithidea obtusa, Littoraria melanostoma, Cassidula aurisfelis, Natica tigrina, Uca vocans dan Uca rosea. Kepadatan berkisar antara 0 – 9 ind/m2. Indeks keanekaragaman berkisar antara 1,79 – 2,09 termasuk keanekaragaman sedang. Indeks keseragaman jenis berkisar antara 0,7 – 0,82 dan indeks dominansi berkisar antara 0,15 – 0,2. Berdasarkan kurva ABC bahwa kawasan mangrove Desa Bagan Deli termasuk dalam katergori tercemar sedang.
Kata kunci : Makrozoobenthos, Struktur Komunitas, Kurva ABC, Tingkat Pencemaran
ii
ABSTRACT
TRI WULANDARI. Macrozoobenthos Community Structure in the Village of Bagan Deli Mangrove Region District of Medan Belawan. Under academy supervision by HESTI WAHYUNINGSIH and AHMAD MUHTADI RANGKUTI.
Activities the continuous in mangrove areas Bagan Deli Village district of Medan Belawan resulted in a decline in water quality, causing changes in the ecological condition of the biota, especially macrozoobenthos. This research aims to determine the community structure of macrozoobenthos and water quality based on Abundance and Comparison (ABC) curve. This research was conducted in the mangrove area of the village of Bagan Deli Medan District Belawan from March until April 2016. The Sampling was done by purposive random sampling method at three stations. Macrozoobenthos and water sampling was caarried out for 1.5 months. Results of this research was found 13 species of macrozoobenthos namely Telescopium telescopium, Turritella terebra, Nassarius reeveanus,
Cerithidea cingulata, Chicoreus capucinus, Nerita lineata, Cerithidea obtusa,
Littoraria melanostoma, Cassidula aurisfelis, Natica Tigrina, Uca vocans and
Uca rosea. Density was from 0 to 9 ind / m2. Diversity index was ranged from 1,79 to 2,09 and the level of diversity rated high. Uniformity index was ranged from 0,7 to 0,82 and dominance index was ranged from 0,15 to 0,2. Based on the ABC curve that the mangrove area of the village of Bagan Deli condition in the medium polluted category.
Keywords : Macrozoobenthos, Community Structure, ABC curve, Pollution Levels
