Water conditions can determine the life form of coral. This study aimed to determine life form of coral growth in different environmental conditions around Lampung Bay waters. The observation using quadratic transect with size (1x1) m 2 and processing data by using CPCE (Coral Point Count with Excel Extension) software. This study was conducted in July 2013. The results showed that the dominant form of coral growth in Lampung Bay waters was branching form of the Acropora genus (ACB), foliose (CF) and massive (CM) forms. Branching types were found in areas with weak current conditions and high brightness levels. Coral foliose were found in areas where the current was also weak and low turbidity. Coral massive domination was found in high level both in current and turbidity. It was concluded that environmental conditions could influence the life form of coral reef in the waters of Lampung Bay.

AbstrakPenyakit pita hitam (BBD)

Sedimentasi dapat menghambat pertumbuhan terumbu karang bahkan dapat menyebabkan kematian. Penelitian ini telah dilakukan di perairan Teluk Lampung. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh sedimentasi terhadap terumbu karang di perairan Teluk Lampung. Sepuluh stasiun dipilih untuk pengamatan dan pengukuran. Pengukuran laju sedimentasi menggunakan alat sediment traps yang dipasang di stasiun pengamatan terumbu karang selama 20 hari. Pengamatan kondisi terumbu karang menggunakan metode transek kuadrat berukuran 1 x 1 m2. Korelasi antara sedimentasi dengan terumbu karang dilakukan dengan metode analisis regresi. Hasil penelitian menunjukkan laju sedimentasi di stasiun pengamatan berkisar antara 3,09-44,29 mg cm-2 day-1. Dampak yang timbul termasuk dalam kategori kecil-sedang dan sedang-berat. Kondisi terumbu karang di perairan Teluk Lampung masuk dalam kategori rusak hingga baik. Persentase tutupan karang di stasiun pengamatan berkisar antara 8,75-60,85%. Hasil analisis regresi menunjukkan bahwa proses sedimentasi memiliki pengaruh negatif terhadap kehidupan terumbu karang di Teluk Lampung.

Coral community patterns on some Indonesian reefs influenced by CO 2 from underwater volcanic vents and nutrients from eutrophication pressures were examined. The overall aim of the study was to provide an insight into the significance of future ocean acidification compared to eutrophication pressures on tropical coral communities.Coral cover and seawater characteristics at acidified sites (with varied levels of eutrophication), i.e., moderate acidification (pH: 7.87 ± 0.04), low acidification (pH:8.01 ± 0.04) and reference (pH: 8.2 ± 0.02), were observed at reefs associated with Minahasa Seashore, and Mahengetang and Gunung Api Islands. Results showed that coral community patterns varied among locations and acidified sites, e.g., domination of families such as Alcyoniidae, Acroporidae, Poritidae and Heliporidae, and with different levels of abiotic cover. Surprisingly, pH was not detected as the major determining factor. This finding probably relates to tropical seawater temperatures being high enough to still allow for aragonite deposition even at pH values down to 7.8.Nutrients (phosphate and dissolved inorganic nitrogen) were shown to be the main determining factors that influenced community patterns on the observed coral reefs.Overall, the results indicate that tropical coral reef community patterns will continue to vary as pH decreases to the predicted oceanic value of pH 7.8 over the next 100 years, and bio-geo-ecological characteristics and anthropogenic pressures will be the major factors determining Indonesian tropical coral community structure, compared to pH. K E Y W O R D Scoral reef community structure, eutrophication, Indonesia, ocean acidification, tropical, underwater volcanic vents

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