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Nutrient enrichment can increase the susceptibility of reef corals to bleaching
Nature climate change, 2013-02, Vol.3 (2), p.160-164
[Peer Reviewed Journal]
2014 INIST-CNRS ;Copyright Nature Publishing Group Feb 2013 ;ISSN: 1758-678X ;EISSN: 1758-6798 ;DOI: 10.1038/nclimate1661
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Title:
Nutrient enrichment can increase the susceptibility of reef corals to bleaching
Author:
WIEDENMANN, Jörg
;
D'ANGELO, Cecilia
;
SMITH, Edward G
;
HUNT, Alan N
;
LEGIRET, Francois-Eric
;
POSTLE, Anthony D
;
ACHTERBERG, Eric P
Subjects:
Animal, plant and microbial ecology
;
Applied ecology
;
Biological and medical sciences
;
Conservation, protection and management of environment and wildlife
;
Environmental degradation: ecosystems survey and restoration
;
Fundamental and applied biological sciences. Psychology
Is Part Of:
Nature climate change, 2013-02, Vol.3 (2), p.160-164
Description:
Mass coral bleaching, resulting from the breakdown of coral-algal symbiosis has been identified as the most severe threat to coral reef survival on a global scale. Regionally, nutrient enrichment of reef waters is often associated with a significant loss of coral cover and diversity. Recently, increased dissolved inorganic nitrogen concentrations have been linked to a reduction of the temperature threshold of coral bleaching, a phenomenon for which no mechanistic explanation is available. Here we show that increased levels of dissolved inorganic nitrogen in combination with limited phosphate concentrations result in an increased susceptibility of corals to temperature- and light-induced bleaching. Mass spectrometric analyses of the algal lipidome revealed a marked accumulation of sulpholipids under these conditions. Together with increased phosphatase activities, this change indicates that the imbalanced supply of dissolved inorganic nitrogen results in phosphate starvation of the symbiotic algae. Based on these findings we introduce a conceptual model that links unfavourable ratios of dissolved inorganic nutrients in the water column with established mechanisms of coral bleaching. Notably, this model improves the understanding of the detrimental effects of coastal nutrient enrichment on coral reefs, which is urgently required to support knowledge-based management strategies to mitigate the effects of climate change.
Publisher:
London: Nature Publishing Group
Language:
English
Identifier:
ISSN: 1758-678X
EISSN: 1758-6798
DOI: 10.1038/nclimate1661
Source:
ProQuest Central
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