Conference Proceeding

Human influences on Luhuitou fringing reef: spatial and temporal evidences from isotopic values

Ms. Di Cao,
Coral reefs have suffered remarkable declines worldwide. Nutrient over-enrichment is considered to be a main local cause. The Luhuitou fringing reef is a famous tourist destination and is undergoing enormous coastal renovation. This study reviews the current nutrient status in seawater and isotopic signatures of POM in a typical fringing reef area in southern China, and try to evaluate possible nutrient sources and the influencing factors. The strong seasonal variations of isotopic signatures coupled with the C/N ratios indicate that hydrodynamic conditions, precipitation as well as human activities have profound implications for corals and the surrounding nutrient concentrations. In dry seasons, there might be more inputs from terrigenous detritus and anthropogenic-derived discharges, whereas in wet seasons, there might be more inputs from marine derived organic matter. Results suggest the existence of anthropogenic influences, thus leading to a high DIN concentration and N/P ratio. Anthropogenic nutrient discharges might moderate the N limitation, whereas P might be more important to the reef ecosystem. In the presence of increasing sever condition caused by climate change, ocean acidification and abnormal SST, as well as natural upwelling and coastal currents, the increasingly frequent human activities could potentially exert overlapping influences on the nutrient supplies in coastal coral reefs. Therefore, efforts should be continuously put into to effectively control the inputs and compositions of human derived nutrients.

Published: 28 July 2017

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Copyright: © 2017 Di Cao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.