期刊
MARINE POLLUTION BULLETIN
卷 97, 期 1-2, 页码 262-272出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2015.06.007
关键词
Water quality; Coral bleaching; Crown-of-thorns starfish; Coral health; Nutrient enrichment; Resilience
A modelling framework is developed for the Wet Tropics region of the Great Barrier Reef that links a quantitative river discharge parameter (viz, dissolved inorganic nitrogen concentration, DIN) with an eutrophication indicator within the marine environment (viz, chlorophyll-a concentration, chl-a). The model predicts catchment-specific levels of reduction (%) in end-of-river DIN concentrations (as a proxy for total potentially reactive nitrogen, PRN) needed to ensure compliance with chl-a 'trigger' guidelines for the ecologically distinct, but PRN-related issues of crown-of-thorns starfish (COTS) outbreaks, reef biodiversity loss, and thermal bleaching sensitivity. The results indicate that even for river basins dominated by agricultural land uses, quite modest reductions in end-of-river PRN concentrations (similar to 20-40%) may assist in mitigating the risk of primary COTS outbreaks from the mid-shelf reefs of the Wet Tropics. However, more significant reductions (similar to 60-80%) are required to halt and reverse declines in reef biodiversity, and loss of thermal bleaching resistance. (C) 2015 Elsevier Ltd. All rights reserved.
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