Electronic Theses and Dissertation

Penelitian tentang keanekaragaman fitoplankton di kawasan konservasi perairan pesisir timur Pulau Weh Kota Sabang. Tujuan penelitian ini untuk menganalisis keanekaragaman jenis fitoplankton, keanekaragaman, keseragaman, dan dominansi fitoplankton pada kawasan konservasi perairan pesisir timur Pulau Weh Sabang. Penentuan stasiun dilakukan dengan metode purposive sampling yaitu untuk menentukan perbedaan karakteristik di setiap stasiun penelitian. Pengambilan sampel fitoplankton menggunakan metode secara langsung menggunakan plankton net. Identifikasi fitoplankton dilakukan di laboratorium biologi Fakultas Kelautan dan Perikanan, Universitas Syiah Kuala. Spesies fitoplankton yang berhasil diidentifikasi adalah Leptocylindrus sp., Synedra sp., Navicula sp., Oscillatoria sp., Melosira sp., Spirogyra sp., Euglena sp., Licmophora sp. terdiri dari 8 spesies. Spesies fitoplankton yang paling banyak ditemukan yaitu Leptocylindrus sp. Hasil kelimpahan fitoplankton yang paling tinggi ditemukan pada stasiun 1 (Ie Meulee) dengan total keseluruhan sebanyak 362,22 ind/l. Indeks keanekaragaman yang ditemukan dengan nilai 0,36 – 0,74, nilai indeks keseragaman berkisar 0,25 - 0,41. Nilai indeks dominansi Fitoplankton berkisar dengan nilai 0,01 - 0,63.

Kata kunci: Fitoplankton, keanekaragaman, kelimpahan, purposive sampling, Kota Sabang.

Research on Phytoplankton Diversity in the East Coast Marine Conservation Area of Weh Island, Sabang City. The purpose of this study is to analyze the diversity of phytoplankton species, diversity, uniformity, and dominance of phytoplankton in the Marine Conservation Area of Weh Island Sabang. Station selection was conducted using purposive sampling to determine differences in characteristics at each research station. Phytoplankton samples were collected directly using a plankton net. Phytoplankton identification was conducted at the Biology Laboratory of the Faculty of Marine Sciences and Fisheries, Syiah Kuala University. The phytoplankton species successfully identified were Leptocylindrus sp., Synedra sp., Navicula sp., Oscillatoria sp., Melosira sp., Spirogyra sp., Euglena sp., and Licmophora sp., totaling 8 species. The most abundant phytoplankton species was Leptocylindrus sp. The highest phytoplankton abundance was found at Station 1 (Ie Meulee) with a total of 362,22 ind/l. The diversity index ranged from 0.36 to 0.74, the evenness index ranged from 0.25 to 0.41, and the dominance index ranged from 0.01 to 0.63. Keywords: Phytoplankton, Diversity, Abundance, Purposive Sampling, Sabang City.