Abstract
Estuary is one of an aquatic ecosystem that has something unique, because it is a meeting area of the fresh and sea water. This study aimed to analyze phytoplankton structure community in estuary of Bengawan Solo River, conducted from January to June 2001 at ten stations distributing from river, estuary and sea. Data analysis was done to evaluate species composition, abundance, diversity, evenness, and dominance indices of the phytoplankton. Clustering based on the phytoplankton abundance was done by using Bray Curtis index. Based on the study, the phytoplankton in the estuary of Bengawan Solo River consisted of 5 classes and 33 species such as. Bacillariophyceae (19 species), Cyanophyceae (2 species), Crysophyceae (3 species), Chlorophyceae (3 species) and Dinophyceae (6 species). Phytoplankton abundance varied, at the river station was 1026-3005 inde/l, the estuary was 5098-19727 inde/l, and the sea was 4206-8697 inde/l. Diversity Index (H) was 0, 29-2, 24, Evenness Index (E) was 0, 02-0, 98, and Dominant Index (C) was 0, 12-0, and 88. There were 3 groups according to clustering analysis based on the phytoplankton abundance using Bray Curtis Index (55%).
Highlights
Estuary is one of an aquatic ecosystem that has something unique, because it is a meeting area of the fresh and sea water
This study aimed to analyze phytoplankton structure community in estuary of Bengawan Solo River, conducted from January to June 2001 at ten stations distributing from river, estuary and sea
Clustering based on the phytoplankton abundance was done by using Bray Curtis index
Summary
Pengambilan Contoh Pengambilan contoh fitoplankton dan sampel air dilakukan pada 10 stasiun pengamatan secara horizontal dari arah sungai menuju laut dimana pada setiap stasiun pengamatan 100 liter (l) air laut disaring, untuk diambil contoh fitoplanktonnya. Stasiun 1, 2, 7, 8, 9 dan 10 merupakan stasiun yang berhubungan dengan sungai, Stasiun 3 dan 6 merupakan stasiun muara sungai, dan Stasiun 4 dan 5 merupakan stasiun di wilayah laut. Contoh fitoplankton tersebut diawetkan dengan larutan lugol sebanyak delapan tetes. Penyaringan contoh fitoplankton dilakukan dengan menggunakan plankton net berukuran 25 (ukuran mesh size 64 um). Identifikasi fitoplankton dilakukan di laboratorium dengan menggunakan mikroskop binokuler dan buku identifikasi plankton Yamaji (1966) dan Davis (1955). Perhitungan fitoplankton tiap genera dilakukan pada saat identifikasi untuk dianalisis kelimpahan, indeks keanekaragaman, indeks keseragaman, dan indeks dominansi
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