Electronic Theses and Dissertation

Terumbu karang merupakan ekosistem laut yang memiliki fungsi penting sebagai habitat biota laut, pelindung pantai, serta penyedia sumber daya hayati bagi manusia. sebaran ukuran koloni karang menjadi salah satu indikator penting dalam menilai kondisi dan daya pulih ekosistem ini. penelitian ini bertujuan untuk menganalisis sebaran spasial ukuran koloni karang di kawasan konservasi perairan pulau simeulue (pisisi). pengambilan data dilakukan di 19 titik stasiun menggunakan metode purposive sampling, sementara pengamatan terumbu karang menggunakan metode belt transect. hasil penelitian mencatat keberadaan 32 genus karang, dengan genus porites sebagai yang paling dominan dan melimpah. porites paling banyak ditemukan pada ukuran koloni 10–20 cm dan 21–40 cm, masing-masing sebesar 0,17 dan 0,18 kol/m². genus heliopora mendominasi pada ukuran koloni besar (161–320 cm), bahkan menjadi satu-satunya genus yang tercatat pada ukuran >320 cm. sebaliknya, genus seperti montipora, pocillopora, dan acropora hanya ditemukan pada ukuran kecil dengan kelimpahan rendah. stasiun ps 14 tercatat sebagai lokasi dengan koloni besar terbanyak, menunjukkan kondisi habitat yang relatif stabil. kata kunci: terumbu karang, ukuran koloni, sebaran spasial, kawasan konservasi, simeulue.

Coral reefs are marine ecosystems that play a vital role as habitats for marine organisms, coastal protectors, and providers of biological resources for humans. The distribution of coral colony sizes is an important indicator for assessing the condition and resilience of these ecosystems. This study aims to analyze the spatial distribution of coral colony sizes within the Simeulue Regional Marine Conservation Area (PISISI). Data were collected from 19 stations using a purposive sampling method, while coral observations were conducted using the belt transect method. The results recorded the presence of 32 coral genera, with Porites being the most dominant and abundant genus. Porites was most frequently found in colony size classes of 10–20 cm and 21–40 cm, with densities of 0,17 and 0,18 col/m², respectively. The genus Heliopora dominated the larger colony size class (161–320 cm) and was the only genus recorded in the >320 cm size class. In contrast, genera such as Montipora, Pocillopora, and Acropora were only found in small sizes with low abundance, indicating their sensitivity to environmental conditions. Station PS 14 was noted as the location with the highest number of large colonies, suggesting a relatively stable habitat condition. Keywords: coral reefs, colony size, spatial distribution, marine protected area, Simeulue.