Growth of Western Australian Corals in the Anthropocene
Growth of Western Australian Corals in the Anthropocene
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DOI：
10.1126/science.1214570
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发表时间：
2012-02-03
期刊：
影响因子：
56.9
通讯作者：
Lough, Janice M.
中科院分区：
文献类型：
--
作者：
Cooper, Timothy F.;O'Leary, Rebecca A.;Lough, Janice M.
人为增加的大气二氧化碳导致海洋表面温度升高和海洋化学变化。实验证据表明，珊瑚钙化随着文石饱和度的下降而减少，但随着温度上升到珊瑚生长的最佳阈值而增加。实地研究记录了最近几个热带珊瑚礁生态系统的钙化率惊人的下降。我们的研究表明，在20世纪，在西澳大利亚州外印度洋东南部纬度11度范围内的珊瑚礁上，没有出现大规模孔隙石钙化率持续下降的普遍模式。高纬度珊瑚礁的钙化率增加与澳大利亚大堡礁珊瑚的下降轨迹形成鲜明对比，并提供了额外的证据，证明最近珊瑚钙化的变化是对温度的反应，而不是海洋酸化。
Anthropogenic increases of atmospheric carbon dioxide lead to warmer sea surface temperatures and altered ocean chemistry. Experimental evidence suggests that coral calcification decreases as aragonite saturation drops but increases as temperatures rise toward thresholds optimal for coral growth. In situ studies have documented alarming recent declines in calcification rates on several tropical coral reef ecosystems. We show there is no widespread pattern of consistent decline in calcification rates of massive Porites during the 20th century on reefs spanning an 11 degrees latitudinal range in the southeast Indian Ocean off Western Australia. Increasing calcification rates on the high-latitude reefs contrast with the downward trajectory reported for corals on Australia's Great Barrier Reef and provide additional evidence that recent changes in coral calcification are responses to temperature rather than ocean acidification.