[Coral-List] Impact of nutrient enrichment on coral reefs
joerg.wiedenmann at noc.soton.ac.uk
Fri Mar 14 03:14:44 EDT 2014
our new publication on the impact of nutrient enrichment on corals and coral reefs can now be freely downloaded from the COSUST page: http://www.sciencedirect.com/science/article/pii/S1877343513001917
We discuss, among other issues, the role that the competition for nutrients by phytoplankton might play in disturbing the nutrient balance in reef ecosystems. The abstract is attached below.
Prof. Dr. Jörg Wiedenmann
University of Southampton, Waterfront Campus, NOCS
Southampton, SO14 3ZH, U.K.
email: joerg.wiedenmann at noc.soton.ac.uk
Mobile: +44 (0)7912564356
Projects on thermal stress tolerance of corals:
D’Angelo, C., Wiedenmann, J., 2014. Impacts of nutrient enrichment on coral reefs: new perspectives and implications for coastal management and reef survival. Current Opinion in Environmental Sustainability 7, 82-93.
Anthropogenic nutrient enrichment is often associated with coral reef decline. Consequently, there is a large consent that increased nutrient influxes in reef waters have negative longterm consequences for corals. However, the mechanisms by which dissolved inorganic nutrients can disturb corals and their symbiotic algae are subject to controversial debate. Herein, we discuss recent studies that demonstrate how nutrient enrichment affects the heat and light stress tolerance of corals and their bleaching susceptibility. We integrate direct and indirect effects of nutrient enrichment on corals in a model that explains why healthy coral reefs can exist over a rather broad range of natural nutrient environments at the lower end of the concentration scale and that anthropogenic nutrient enrichment can disturb the finely balanced processes via multiple pathways. We conceptualise that corals can suffer from secondary negative nutrient effects due to the alteration of their natural nutrient environment by increased phytoplankton loads. In this context, we suggest that phytoplankton represents a likely vector that can translate nutrients effects, induced for instance by coastal run-off, into nutrient stress on coral reefs in considerable distance to the site of primary nutrient enrichment. The presented synthesis of the literature suggests that the effects of nutrient enrichment and eutrophication beyond certain thresholds are negative for the physiological performance of the coral individual and for ecosystem functioning. Hence, the immediate implementation of knowledge-based nutrient management strategies is crucial for coral reef survival.
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