Caribbean-wide decline in carbonate production threatens coral reef growth.
Caribbean-wide decline in carbonate production threatens coral reef growth.
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DOI：
10.1038/ncomms2409
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发表时间：
2013
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
全球范围内珊瑚礁健康状况的恶化导致了物种组成的重大变化。一个预计的后果是珊瑚礁碳酸盐产量的降低，可能会损害珊瑚礁的生长，损害生态系统的功能，最终导致珊瑚礁的净侵蚀。通过测量19个加勒比海珊瑚礁的总碳酸盐产量和净碳酸盐产量和侵蚀，我们发现当代碳酸盐产量现在大大低于历史（全新世中期至晚）值。平均而言，目前的产量至少降低了50%，37%的被调查地点被净侵蚀。计算出的浅层礁前生境的吸积率（mm年−1）也比全新世平均值低近一个数量级。约10%的活珊瑚覆盖阈值似乎对维持积极的生产状态至关重要。低于这个生态阈值，碳酸盐收支通常变为净负，并威胁到珊瑚礁的增生。总的来说，这些数据表明，最近的生态衰退正在抑制加勒比海珊瑚礁的生长潜力。全球珊瑚礁健康状况正在下降，预计将导致珊瑚礁结构的净损失。这项研究表明，整个加勒比地区的生态变化使珊瑚礁的生长速度降低到低于过去约8000年的水平，威胁到珊瑚礁跟上未来海平面上升步伐的能力。
Global-scale deteriorations in coral reef health have caused major shifts in species composition. One projected consequence is a lowering of reef carbonate production rates, potentially impairing reef growth, compromising ecosystem functionality and ultimately leading to net reef erosion. Here, using measures of gross and net carbonate production and erosion from 19 Caribbean reefs, we show that contemporary carbonate production rates are now substantially below historical (mid- to late-Holocene) values. On average, current production rates are reduced by at least 50%, and 37% of surveyed sites were net erosional. Calculated accretion rates (mm year−1) for shallow fore-reef habitats are also close to an order of magnitude lower than Holocene averages. A live coral cover threshold of ~10% appears critical to maintaining positive production states. Below this ecological threshold carbonate budgets typically become net negative and threaten reef accretion. Collectively, these data suggest that recent ecological declines are now suppressing Caribbean reef growth potential. Coral reef health is declining globally and is projected to lead to net loss of reef structure. This study shows that ecological change across the Caribbean has reduced reef growth rates to levels lower than those measured over the last ~8,000 years, threatening the ability of reefs to keep pace with future sea-level rise.
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影响因子：
9.8
作者：
Côté IM;Darling ES
通讯作者：
Darling ES
DOI：
10.1098/rspb.2009.0339
发表时间：
2009-08-22
影响因子：
4.7
作者：
Alvarez-Filip, Lorenzo;Dulvy, Nicholas K.;Watkinson, Andrew R.
通讯作者：
Watkinson, Andrew R.
影响因子：
3.5
作者：
Mallela, J.;Perry, C. T.
通讯作者：
Perry, C. T.
影响因子：
2.5
作者：
Green, Daniel H.;Edmunds, Peter J.;Carpenter, Robert C.
通讯作者：
Carpenter, Robert C.
影响因子：
18.3
作者：
Knutson, Thomas R.;Sirutis, Joseph J.;Held, Isaac M.
通讯作者：
Held, Isaac M.