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Nutrient-supplying ocean currents modulate coral bleaching susceptibility.
Thomas M DeCarlo1, Laura Gajdzik2, Joanne Ellis2
1Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia. tdecarlo@hpu.edu.
Science Advances
|September 16, 2020
Summary
Excess nutrients worsen heat stress, causing mass coral bleaching in the Red Sea. Conservation must consider both factors to protect coral reefs from climate change impacts.
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Area of Science:
- Marine Biology
- Oceanography
- Climate Change Science
Background:
- Mass coral bleaching events are predicted to become annual this century.
- Effective conservation requires understanding the primary drivers of coral bleaching.
- The Red Sea's unique oceanography allows independent variation of heat stress and nutrient levels.
Purpose of the Study:
- To investigate the combined effects of heat stress and nutrient pollution on coral bleaching.
- To provide spatial and temporal evidence of nutrient exacerbation of heat-induced bleaching in the Red Sea.
- To inform conservation strategies by identifying key drivers of coral reef resilience.
Main Methods:
- Analysis of historical bleaching data in the Red Sea.
- Correlation of bleaching events with independent variations in sea surface temperature and nutrient levels.
- Utilizing the Red Sea's distinct oceanographic conditions to isolate bleaching drivers.
Main Results:
- Severe mass coral bleaching in the Red Sea historically occurred only when high temperatures coincided with elevated nutrient levels.
- Excess nutrients significantly exacerbate the negative impacts of thermal stress on corals.
- Nutrient-supplying ocean currents were identified as a critical factor in bleaching events.
Conclusions:
- Nutrient pollution is a key, often overlooked, driver of mass coral bleaching.
- Integrating nutrient dynamics into climate models is essential for accurate coral bleaching forecasts.
- Targeted conservation efforts should consider both thermal stress and nutrient loads to protect vulnerable coral reef systems.


