Electronic Theses and Dissertation

Ekosistem mangrove merupakan habitat penting bagi organisme bentik termasuk Crustacea dan Moluska. Sering terjadi perubahan kondisi substrat karena terjadi pembuangan limbah dan aktivitas nelayan. Penelitian ini bertujuan untuk mengkaji spesies, kelimpahan, frekuensi kehadiran, indeks kekayaan spesies, jenis tekstur substrat, korelasinya terhadap keberadaan Crustacea dan Moluska, serta menganalisis hubungan faktor fisika kimia perairan dengan spesies Crustacea dan Moluska. Penelitian dilakukan Desember 2024 di ekosistem mangrove perairan Ulee Lheue Kecamatan Meuraxa Kota Banda Aceh. Kawasan penelitian terdiri atas 3 stasiun yaitu daerah dengan mangrove jarang, sedang, dan lebat. Metode yang digunakan adalah metode survei menggunakan kombinasi Line transek dan transek kuadran dengan teknik Purposive sampling. Analisis data menggunakan indeks kelimpahan, frekuensi kehadiran, kekayaan spesies, korelasi pearson, serta analisis faktor fisika kimia perairan menggunakan Principal Component Analysis (PCA). Hasil penelitian menunjukkan spesies Crustacea dan Moluska yang ditemukan sebanyak 22 spesies, indeks kelimpahan spesies Di = 22,93 (ind/m2), indeks frekuensi kehadiran FK = 10,07, indeks kekayaan spesies DMg = 3,2140616, fraksi pasir memiliki korelasi negatif (r = -0,975) dengan tingkat kekayaan spesies, fraksi liat (r = 0,936) dan debu (r = 0,926) berkorelasi positif dengan tingkat kekayaan spesies. Kesimpulan menyatakan bahwa kelimpahan Crustacea dan Moluska tergolong tinggi, tingkat kehadiran jarang, indeks kekayaan spesies sedang, fraksi pasir berkorelasi negatif dengan indeks kekayaan spesies, sedangkan fraksi liat dan fraksi debu berkorelasi positif dengan indeks kekayaan spesies. Hasil analisis PCA yaitu beberapa spesies menunjukkan korelasi positif terhadap kecerahan, salinitas, DO, kedalaman, suhu, dan pH. Spesies lainnya tidak menunjukkan hubungan yang kuat dengan faktor fisika kimia perairan.

Mangrove ecosystems are important habitats for benthic organisms, including crustaceans and mollusks. Changes in substrate conditions often occur due to waste disposal and fishing activities. This study aims to examine species, abundance, frequency of occurrence, species richness index, substrate texture type, its correlation with the presence of Crustacea and Mollusks, and analyze the relationship between physical and chemical factors of the water with Crustacea and Mollusk species. The research was conducted in December 2024 in the mangrove ecosystem of Ulee Lheue, Meuraxa District, Banda Aceh City. The research area consisted of three stations, namely areas with sparse, moderate, and dense mangroves. The method used was a survey method using a combination of line transects and quadrant transects with purposive sampling techniques. Data analysis used abundance index, frequency of occurrence, species richness, Pearson correlation, and analysis of physical and chemical factors of the water using Principal Component Analysis (PCA). The results of the study show that 22 species of Crustacea and Mollusca were found, with a species abundance index of Di = 22.93 (ind/m2), a frequency of occurrence index of FK = 10.07, a species richness index of DMg = 3.2140616, the sand fraction had a negative correlation (r = -0.975) with species richness, while the clay fraction (r = 0.936) and silt fraction (r = 0.926) had a positive correlation with species richness. The conclusion states that the abundance of Crustacea and Mollusks is relatively high, the level of occurrence is rare, the species richness index is moderate, the sand fraction is negatively correlated with the species richness index, while the clay and silt fractions are positively correlated with the species richness index. The results of the PCA analysis show that several species exhibit a positive correlation with brightness, salinity, DO, depth, temperature, and pH. Other species do not show a strong relationship with the physical and chemical factors of the water.