Nutrient pollution disrupts key ecosystem functions on coral reefs
- 6 June 2018
- journal article
- research article
- Published by The Royal Society in Proceedings. Biological sciences
- Vol. 285 (1880), 20172718
- https://doi.org/10.1098/rspb.2017.2718
Abstract
There is a long history of examining the impacts of nutrient pollution and pH on coral reefs. However, little is known about how these two stressors interact and influence coral reef ecosystem functioning. Using a six-week nutrient addition experiment, we measured the impact of elevated nitrate (NO−3) and phosphate (PO3−4) on net community calcification (NCC) and net community production (NCP) rates of individual taxa and combined reef communities. Our study had four major outcomes: (i) NCC rates declined in response to nutrient addition in all substrate types, (ii) the mixed community switched from net calcification to net dissolution under medium and high nutrient conditions, (iii) nutrients augmented pH variability through modified photosynthesis and respiration rates, and (iv) nutrients disrupted the relationship between NCC and aragonite saturation state documented in ambient conditions. These results indicate that the negative effect of NO−3 and PO3−4 addition on reef calcification is likely both a direct physiological response to nutrients and also an indirect response to a shifting pH environment from altered NCP rates. Here, we show that nutrient pollution could make reefs more vulnerable to global changes associated with ocean acidification and accelerate the predicted shift from net accretion to net erosion.Keywords
Funding Information
- National Fish and Wildlife Foundation (44447)
- Division of Ocean Sciences (OCE-1538393, OCE-PRF 1323822)
This publication has 62 references indexed in Scilit:
- Bioerosion: the other ocean acidification problemICES Journal of Marine Science, 2017
- A Novel μCT Analysis Reveals Different Responses of Bioerosion and Secondary Accretion to Environmental VariabilityPLOS ONE, 2016
- Ocean acidification accelerates net calcium carbonate loss in a coral rubble communityCoral Reefs, 2016
- Secondary calcification and dissolution respond differently to future ocean conditionsBiogeosciences (online), 2015
- Reefs shift from net accretion to net erosion along a natural environmental gradientMarine Ecology Progress Series, 2014
- Caribbean-wide decline in carbonate production threatens coral reef growthNature Communications, 2013
- Ocean Acidification Accelerates Reef BioerosionPLOS ONE, 2012
- Coral Reefs Under Rapid Climate Change and Ocean AcidificationScience, 2007
- Ecological goods and services of coral reef ecosystemsEcological Economics, 1999
- Climate change, coral bleaching and the future of the world's coral reefsMarine and Freshwater Research, 1999