Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mengetahui struktur komunitas makrofauna dasar dan hubungannya dengan kondisi lingkungan perairan di pantai Kuala Pudeng, Gampong Glee Bruek, Kecamatan Lhoong. Metode pengambilan sampel dilakukan secara purposive random sampling di tiga stasiun pengamatan..Parameter lingkungan yang diukur meliputi suhu, pH, salinitas, oksigen terlarut (DO), jenis substrat, dan kandungan karbon organik (C-organik) dalam sedimen. Data dianalisis secara deskriptif untuk melihat keterkaitan antar parameter dengan struktur komunitas makrofauna. Hasil penelitian menunjukkan bahwa terdapat tiga jenis makrofauna dasar dengan dominasi oleh Ocypode cordimanus. Nilai kepadatan bervariasi di setiap stasiun, dipengaruhi oleh faktor lingkungan, terutama kandungan C-organik. Indeks keanekaragaman (H') tergolong sedang, indeks keseragaman (E) tinggi, dan indeks dominansi (C) rendah, yang mengindikasikan bahwa komunitas makrofauna di lokasi penelitian cukup stabil dan tidak mengalami tekanan ekologis besar. Substrat di semua stasiun didominasi oleh pasir, sedangkan kandungan karbon organik tergolong sangat rendah. Hasil ini menunjukkan bahwa meskipun nilai C-organik rendah, kondisi lingkungan di pantai Kuala Pudeng masih mampu mendukung kehidupan makrofauna dasar.

Kata kunci: Karbon organik, komunitas, makrofauna dasar, substrat, pantai Kuala Pudeng.

This study aims to describe the structure of the benthic macrofauna community and its relationship with environmental conditions at Kuala Pudeng Beach, Glee Bruek Village, Lhoong Subdistrict. Sampling was carried out using a purposive random sampling method at three observation stations. The environmental parameters measured included temperature, pH, salinity, dissolved oxygen (DO), substrate type, and organic carbon (C-organic) content in the sediment. Data were analyzed descriptively to identify the relationship between these parameters and the macrofauna community structure. The results showed three species of benthic macrofauna, dominated by Ocypode cordimanus. The density of macrofauna differed among stations and was mainly affected by environmental factors, especially organic carbon content. The diversity index (H’) was moderate, the evenness index (E) was high, and the dominance index (C) was low. These results indicate that the macrofauna community in the study area is relatively stable and not under significant environmental stress. The substrate at all stations was dominated by sand, while the organic carbon content was very low. Even with low organic carbon levels, the environmental conditions at Kuala Pudeng Beach are still suitable to support benthic macrofauna life. Keywords: benthic macrofauna, community, kuala pudeng beach, organic carbon, substrate.