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- Davis, K. L., et al.
(författare)
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Calcification and organic productivity at the world's southernmost coral reef
- 2020
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Ingår i: Marine Chemistry. - : Elsevier BV. - 0304-4203. ; 227
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Tidskriftsartikel (refereegranskat)abstract
- Estimates of coral reef calcification and organic productivity provide valuable insight to community functionality and the response of an ecosystem to stress events. High-latitude coral reefs are expected to experience rapid changes in calcification rates and become refugia for tropical species following climate change and increasing bleaching events. Here, we estimate ecosystem-scale calcification and organic productivity at the world's southernmost coral reef using seawater carbon chemistry observations (Lord Howe Island, Australia). We reduce uncertainties in metabolic calculations by producing a detailed bathymetric model and deploying two current meters to refine residence time and volume estimates. Bathymetry-modelled transect depths ranged from 74% shallower to 20% deeper than depths averaged from reef crest/flat current meters, indicating that higher-resolution depth observations help to reduce uncertainties in reef metabolic calculations. Rates of ecosystem calcification were 56.6 +/- 14.8 mmol m(-2) d(-1) in the winter and 125.3 +/- 39.4 mmol m(-2) d(-1) in the summer. These rates are lower than most other high-latitude reefs according to our compilation of high-latitude coral ecosystem metabolism estimates. Coral cover ranged from 14.7 +/- 2.3% in winter to 19.8 +/- 2.1% in the summer. A concurrent bleaching event and cyclone occurred during summer sampling (February - March 2019), resulting in 47% of corals bleached at the study site and 2% mortality due to cyclonal damage. Therefore, it is likely that the summertime G(net) rates underestimate baseline calcification. Our results enable future assessments of long-term change, but do not resolve the impact of bleaching at Lord Howe Island.
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