Electronic Theses and Dissertation

Gastropoda merupakan moluska dengan kelompok yang mempunyai banyak ragam serta paling besar sebab dapat hidup di berbagai macam habitat serta kondisi ekosistem. Penelitian ini ditujukan guna mengetahui keanekaragaman serta kelimpahan kelompok Gastropoda di perairan Lanaga Kecamatan Meureubo Kabupaten Aceh Barat. Penelitian ini menggunakan metode survei eksploratif. Pengambilan data dilakukan menggunakan teknik purposive sampling pada tiga lokasi, setiap lokasi dibedakan kedalam tiga stasiun, dan setiap stasiun ditetapkan tiga plot berukuran 1m kuadrat. Parameter dalam penelitian ini adalah faktor lingkungan berupa suhu, pH, salinitas, dan jumlah individu serta jumlah spesies Gastropoda. Analisis data menggunakan indeks keanekaragaman (H) Shanon-Wiener dan kelimpahan relatif. Hasil penelitian memperlihatkan faktor suhu perairan berkisar 27 - 33 celcius, pH berkisar 6,3 - 7,6 dan salinitas berkisar 5 - 15 persen. Terdapat 11 spesies Gastropoda dengan Indeks Keanekaragaman H =1.88 yang dikategorikan sedang. Kelimpahan relatif tertinggi adalah Faunus ater (42 persen), dan terendah adalah Thiara miricifa, Vittina natalensis, dan Clithon diadema masing-masing 2 persen. Simpulan dari penelitian ini adalah kondisi lingkungan optimum, keanekaragaman sedang, spesies Gastropoda paling banyak ditemukan adalah Faunus ater.
Kata kunci: Gastropoda, Keanekaragaman, Kelimpahan, Perairan

Gastropods are the most diverse and largest group of mollusks because they occupy a variety of habitats and also ecosystems. This research aims to determine the abundance and diversity of Gastropods in Lanaga waters, Meureubo District, West Aceh Regency. This research uses an exploratory survey method. Data collection was done applying a purposive sampling technique at three locations, each was differentiated into three stations, and was assigned three plots measuring 1m. The parameters in this research are environmental factors in the form of temperature, pH, salinity, and number of individuals and number of Gastropod species. Data analysis used the Shanon-Wiener diversity index (H) and relative abundance. The research results show that the water temperature factor ranges from 27 - 33 celcius, pH ranges from 6.3 - 7.6 and salinity ranges from 5 - 15 percent. There are 11 species of Gastropods with a Diversity Index of H = 1.88 which is categorized as medium. The highest relative abundance was Faunus ater (42 percent), and the lowest was Thiara miricifa, Vittina natalensis, and Clithon diadema at 2 percent each. The conclusion from this research is that environmental conditions are optimum, diversity is moderate, the most gastropod species found is Faunus ater. Key words: Gastropods, Diversity, Abundance