An apparent “vital effect” of calcification rate on the Sr/Ca temperature proxy in the reef coral Montipora capitata
An apparent “vital effect” of calcification rate on the Sr/Ca temperature proxy in the reef coral Montipora capitata
复制标题
钙化率对头状珊瑚珊瑚中 Sr/Ca 温度代理的明显“重要影响”
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
F. Mackenzie
中科院分区：
文献类型：
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作者：
I. B. Kuffner;P. Jokiel;K. Rodgers;A. Andersson;F. Mackenzie
测量珊瑚骨骼中的锶钙比例揭示了骨骼沉积过程中海水温度的信息，但研究表明，其他变量可能会影响该比例。在这里，我们测量Sr/Ca的珊瑚Montipora capitata生长在6个中生态系统连续供应海水从邻近的礁坪。三个中型生态系统的环境控制，和三个海水化学模拟“海洋酸化”（OA）。我们发现Sr/Ca不受OA处理的影响，这些小菌落的珊瑚钙化也不受影响（较大的菌落确实显示出OA效应）。缺乏OA的影响，使我们能够测试的假设，珊瑚生长速度可以影响Sr/Ca使用自然范围内的钙化率的珊瑚生长在相同的温度下。我们发现Sr/Ca与钙化率呈负相关（Sr/Ca = 9.385 - 0.0040（钙化率））。使用先前发表的该物种的校准曲线，钙化率增加22 mg d−1菌落− 1，温度估计值升高1°C，27个珊瑚报告的“温度”范围为24.9至28.9°C，平均标准差为26.6 ± 0.9°C。我们的研究结果支持的假设调用动力学过程和增长率来解释重要的影响Sr/Ca。然而，Sr/Ca对钙化的回归斜率的不确定性和较低的R平方值使我们得出结论，如果有足够的复制或通过在校准中包括生长速率，Sr/Ca仍然可能是该物种的有用替代物。
Measuring the strontium to calcium ratio in coral skeletons reveals information on seawater temperatures during skeletal deposition, but studies have shown additional variables may affect the ratio. Here we measured Sr/Ca in the reef coral Montipora capitata grown in six mesocosms continuously supplied with seawater from the adjacent reef flat. Three mesocosms were ambient controls, and three had seawater chemistry simulating “ocean acidification” (OA). We found that Sr/Ca was not affected by the OA treatment and neither was coral calcification for these small colonies (larger colonies did show an OA effect). The lack of OA effects allowed us to test the hypothesis that coral growth rate can affect Sr/Ca using the natural range in calcification rates of the corals grown at the same temperature. We found that Sr/Ca was inversely related to calcification rate (Sr/Ca = 9.385 − 0.0040 (calcification rate)). Using a previously published calibration curve for this species, a 22 mg d−1 colony−1increase in calcification rate introduced a 1°C warmer temperature estimate, with the 27 corals reporting “temperatures” ranging from 24.9 to 28.9°C, with mean 26.6 ± 0.9°C standard deviation. Our results lend support to hypotheses invoking kinetic processes and growth rate to explain vital effects on Sr/Ca. However, uncertainty in the slope of the regression of Sr/Ca on calcification and a low R‐squared value lead us to conclude that Sr/Ca could still be a useful proxy in this species given sufficient replication or by including growth rate in the calibration.
影响因子：
2.3
作者：
Pfeiffer, Miriam;Dullo, Wolf-Christian;Garbe-Schoenberg, Dieter
通讯作者：
Garbe-Schoenberg, Dieter
影响因子：
5
作者：
Krief, Shani;Hendy, Erica J.;Shemesh, Aldo
通讯作者：
Shemesh, Aldo