After exposing test plots in the Florida Keys, USA to increased nutrients (at levels equivalent to nutrient input from onshore sources), researchers found that increased nutrient levels led to increased prevalence and severity of coral diseases and coral bleaching. However, one year after nutrient enrichment stopped, there were no differences in bleaching or disease, indicating that coastal nutrients are increasing prevalence of bleaching and disease. Local scale nutrient input may worsen the effects of global stressors, so limiting nutrient input may be an important management tool for reducing threats to corals. This study is the first to show that nutrients can cause an increase of prevalence of disease or bleaching in the field.
Vega Thurber, R.L., D.E. Burkepile, C. Fuchs, A.A. Shantz, R. McMinds, and J.R. Zaneveld
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Global Change Biology 20(2): 544–554. doi:10.1111/gcb.12450