Electronic Theses and Dissertation

Abstrak fitoplankton dan zooplankton merupakan pakan alami bagi biota laut termasuk ikan. tujuan penelitian adalah untuk mengetahui struktur komunitas plankton di muara sungai batee iliek dan muara sungai peudada. penelitian dilakukan pada bulan april 2015. penelitian dilakukan dengan menggunakan metode purposive sampling pada 2 stasiun dengan 3 substasiun pada tiap stasiunnya. parameter yang diukur adalah: suhu air, salinitas, kecerahan, ph, dan oksigen terlarut. hasil penelitian menunjukkan bahwa plankton yang ditemukan pada stasiun 1 terdiri atas 5 kelas meliputi: bacillariophycea (6 spesies), dinophyceae (4 spesies), coscinodiscophyceaea (1 spesies), litostomatea (1 spesies), dan crustacea (5 spesies). plankton yang ditemukan pada stasiun 2 terdiri atas 5 kelas juga yaitu meliputi: bacillariophycea (6 spesies), dinophyceae (5 spesies), chrysophyceaea (1 spesies), litostomatea (1 spesies), dan crustacea (3 jenis). kelimpahan plankton tertinggi yaitu 90193 ind/l. indeks keanekaragaman (h’) berkisar antara 1,60–2,24, indeks keseragaman (e) berkisar antara 0,73-0,83, indeks dominansi (d) berkisar antara 0,15-0,27, dan indeks similaritas 84,2%. suhu air, ph, dan salini tas berkisar antara (28,0-30,2 ), (8,2-8,4) dan (6-15 .) kata kunci: struktur komunitas, fitoplankton, zooplankton, muara sungai batee iliek, muara sungai peudada iii abstract phytoplankton and zooplankton are natural feed for aquatic ecosystems including fish. the aim of this study was to determine the structure of plankton community at estuary waters batee iliek river and peudada river. the study was conducted in april 2015 by using purposive sampling method, which was carried out by two stations, where there were 3 substations in each station. parameters measured were water temperature, salinity, ph, and dissolved oxygen. the results showed that the plankton found in station 1 consist of 5 classes included: bacillariophycea (6 species), dinophyceae (4 species), coscinodiscophyceaea (1 species), litostomatea (1 species) and crustaceans (5 species). plankton are found at station 2 also consist of 5 classes which included: bacillariophycea (6 species), dinophyceae (5 species), chrysophyceaea (1 species), litostomatea (1 species) and crustaceans (3 types). the highest abundance of plankton that was 90.193 ind/l. diversity index (h ') ranged from 1,60-2,24, evenness index (e) ranges between 0,73-0,83, and dominance index (d) ranged from 0,15 to 0,27, and the similarity index was 84,2%. the water temperature, ph, salinity were ranged from between (28,0-30,2 ?), (8,2-8,4), and (6-15 ). keyword: community structure, phytoplankton, zooplankton, estuary of batee iliek river, estuary of peudada river