Electronic Theses and Dissertation

ABSTRAK

Ekosistem lamun memiliki peran penting secara ekologis sebagai habitat biota laut, penstabil sedimen, serta penyerap karbon biru. Penelitian ini bertujuan untuk menganalisis dan menetapkan lokasi prioritas restorasi padang lamun melalui pendekatan konektivitas ekologi dengan integrasi Preliminary Transplant Suitability Index (PTSI) dan Transplant Suitability Index (TSI). Penelitian dilaksanakan pada bulan Agustus sampai Desember 2025 di Perairan Ahmad Rhang Manyang, Kabupaten Aceh Besar. Metode yang digunakan adalah Purposive Sampling dengan pengukuran parameter biofisik habitat, kualitas perairan, intensitas cahaya, aktivitas bioturbasi, dan uji transplantasi lamun. Data dianalisis menggunakan indeks PTSI, TSI, serta survival rate lamun hasil transplantasi. Hasil penelitian menunjukkan bahwa pada Fase I lokasi penelitian memperoleh nilai PTSI sebesar 2 yang termasuk kategori cukup sesuai, dengan tutupan lamun saat ini sebesar 27,95% dan jarak 150 m dari padang lamun alami. Pada Fase II, intensitas cahaya di dasar perairan mencapai ≥20% dari cahaya permukaan dan aktivitas bioturbasi tergolong sedang. Namun, tingkat kelangsungan hidup lamun hasil transplantasi menurun dari 123 tegakan menjadi 73 tegakan pada monitoring pertama, dan mencapai 0% pada akhir penelitian. Pada Fase III, lokasi penelitian memperoleh nilai TSI sebesar 0, sehingga dikategorikan tidak layak/ dieliminasi sebagai prioritas restorasi. Faktor pembatas utama keberhasilan transplantasi diduga meliputi arus dan gelombang yang kuat, sedimentasi tinggi, serta substrat yang kurang stabil. Dengan demikian, lokasi penelitian belum direkomendasikan sebagai lokasi restorasi padang lamun dan diperlukan pemilihan lokasi yang lebih sesuai serta upaya mitigasi terhadap faktor pembatas lingkungan.

Kata kunci: Lamun, Restorasi, Konektivitas Ekologi, PTSI, TSI, Ahmad Rhang Manyang.

ABSTRACT Seagrass ecosystems play an important ecological role as a habitat for marine life, as a sediment stabilizer, and as a blue carbon sink. This study aims to analyze and determine priority locations for seagrass bed restoration through an ecological connectivity approach integrating the Preliminary Transplant Suitability Index (PTSI) and Transplant Suitability Index (TSI). The study was conducted from August to December 2025 in the waters of Ahmad Rhang Manyang, Aceh Besar Regency. The purposive sampling method was used to measure biophysical Parameters of the habitat, water quality, light intensity, bioturbation activity, and seagrass transplantation tests. Data were analyzed using the PTSI and TSI indices, as well as the survival rate of transplanted seagrass. The results showed that in Phase I, the study location obtained a PTSI value of 2, which is categorized as quite suitable, with a current seagrass cover of 27.95% and a distance of 150 m from natural seagrass beds. In Phase II, light intensity at the bottom of the waters reached ≥20% of the surface light and bioturbation activity was classified as moderate. However, the survival rate of transplanted seagrass decreased from 123 to 73 stands during the first monitoring period, reaching 0% at the end of the study. In Phase III, the study site received a TSI score of 0, thus being categorized as unsuitable and eliminated as a restoration priority. The main limiting factors for transplantation success are thought to include strong currents and waves, high sedimentation, and unstable substrates. Therefore, the study site is not recommended for seagrass restoration, and more suitable site selection and mitigation efforts to address environmental limiting factors are needed. Keywords: Seagrass,Restoration, Ecological Connectivity, PTSI, TSI, Ahmad Rhang Manyang.