Abstract
Coral reef health has declined significantly around the world as a result of anthropogenic activities and natural environment changes, such sewage pollution and climate change due to global warming. These significant threats can interrupt coral’s fluorescence yield and also modify the zooxanthellae performance, which can lead to bleaching events if prolonged stress. Nowadays, other than using zooxanthellae density to determine coral’s health, numerous study starts to focus more on observing the effective quantum yield, Y(II) of corals by using Pulse Amplitude (PAM) fluorometer, as it is an effective and non-lethal way in determining coral’s health. In this study, there are two objectives to be achieved which are i) To measure the effective quantum yield of Montipora sp. before and after nitrate and temperature stress and ii) To calculate the zooxanthellae density of Montipora sp. after nitrate and temperature stress. Montipora sp. that was exposed to high nitrate (HN), high temperature (HT) and high nitrate with high temperature (HNHT) treatment exhibited the decrement of their Y(II) reading and zooxanthellae density after 48 hours exposure. Major decrease of Y(II) resulted from the HN treatment while major drop of zooxanthellae is caused by HT treatment. For future studies, longer term experiment duration, various coral species and molecular studies should be done to understand the photoinhibition process and its effect to the coral body system.
Published Version
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