Electronic Theses and Dissertation

Ekosistem terumbu karang mempunyai peran vital di perairan sehingga kerusakan ekosistem terumbu karang dapat menurunkan fungsi-fungsi ekologi maupun sosial-ekonominya yang dapat berdampak pada ketidakseimbangan lingkungan. Biota-biota yang berasosiasi dengan terumbu karang ada yang dapat menyebabkan kerusakan pada struktur komunitas karang, terutama avertebrata air invasif yang bersifat sebagai predator karang. Keberadaan avertebrata air invasif yang melimpah dapat memberikan dampak pada menurunnya struktur komunitas karang ataupun kelimpahan jenis karang. Penelitian ini bertujuan untuk mengetahui struktur komunitas avertebrata air invasif melalui pendekatan kelimpahan, keanekaragaman, keseragaman, dominansi, distribusi serta melihat hubungan kelimpahan avertebrata air invasif dengan persentase tutupan terumbu karang pada ekosistem terumbu karang di Perairan Krueng Raya, Aceh Besar. Metode yang digunakan adalah metode purposive sampling dalam penentuan titik stasiun, sedangkan pengambilan data avertebrata air invasif menggunakan metode belt transect dan pengambilan data terumbu karang menggunakan metode point intercept transect (PIT). Secara keseluruhan struktur komunitas avertebrata invasif rata-rata di Perairan Krueng Raya adalah keanekaragaman 2,30 (sedang), keseragaman 0,92 (tinggi), dominansi 0,23 (rendah). Distribusi avertebrataa air invasif di Perairan Krueng Raya secara umum tergolong mengelompok. Perbandingan kelimpahan avertebrata air invasif tertinggi yaitu di stasiun Ahmad Rhang Manyang dengan nilai 0,17 ind/m2 dan persentase terumbu karangnya sebesar 53,33%, serta kelimpahan avertebrata air invasif terendah yaitu di stasiun Benteng Inong Balee dengan nilai 0,11 ind/m2 dan persentase tutupan karang sebesar 68,67%. Hal ni menunjukkan bahwa tidak adanya pengaruh antara kelimpahan avertebrata air invasif terhadap persentase tutupan karang. Hubungan korelasi antara kelimpahan avertebrata air invasif dengan tutupan karang adalah berkorelasi lemah.

Kata Kunci: Avertebrata Air, Avertebrata Invasif, Terumbu Karang, Kelimpahan, Struktur Komunitas

Coral reef ecosystems play a vital role in the water, so damage to coral reef ecosystems can reduce ecological and socio-economic functions that can impact environmental imbalances. Biota associated with coral reefs can cause damage to coral community structure, especially invasive aquatic avertebrates that are coral predators. The presence of abundant invasive aquatic avertebrates can have an impact on the decline of coral community structure or coral species abundance. This study aims to determine the community structure of invasive aquatic avertebrates through the approach of abundance, diversity, uniformity, dominance, distribution and see the relationship between the abundance of invasive aquatic avertebrates and the percentage of coral reef cover in the coral reef ecosystem in Krueng Raya Waters, Aceh Besar. The method used was purposive sampling method in determining station points, while invasive aquatic avertebrates data collection using belt transect method and coral reef data collection using point intercept transect (PIT) method. Overall, the average invasive avertebrate community structure in Krueng Raya Waters is diversity of 2.30 (medium), uniformity of 0.92 (high), dominance of (low). The distribution of invasive aquatic avertebrates in Krueng Raya Waters is generally classified as clustered. Comparison of the highest abundance of invasive aquatic avertebrates is at Ahmad Rhang Manyang station with a value of 0.17 ind/m2 and the percentage of coral reefs of 53.33%, and the lowest abundance of invasive aquatic avertebrates is at Benteng Inong Balee station with a value of 0.11 ind/m2 and the percentage of coral cover of 68.67%. This shows that there is no influence between the abundance of invasive aquatic avertebrates on the percent of coral cover. The correlation between the abundant of invasive aquatic avertebrates and coral cover is weakly correlated. Keywords: Aquatic Invertebrates, Invasive Invertebrates, Coral Reefs, Abundance, Community Structure