Multiple driving factors explain spatial and temporal variability in coral calcification rates on the Bermuda platform
Multiple driving factors explain spatial and temporal variability in coral calcification rates on the Bermuda platform
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多种驱动因素解释了百慕大平台上珊瑚钙化率的空间和时间变化
DOI：
10.1007/s00338-014-1191-9
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发表时间：
2014
期刊：
影响因子：
3.5
通讯作者：
Langdon, C.
中科院分区：
文献类型：
--
作者：
Venti, A.;Andersson, A.;Langdon, C.
实验研究表明，珊瑚钙化率取决于光照、营养物质、食物供应、温度和海水文石饱和度（Ω arag），但每个参数在自然环境中的相对重要性仍然不确定。在这项研究中，我们应用钙黄绿素荧光染料作为时间指标内的骨骼的珊瑚殖民地（n = 3）ofPorites astreoides和Diploria strigosa在三个研究地点分布在整个北方百慕大珊瑚礁平台。我们评估了基于珊瑚密度和扩展速率的季节平均生长速率与平均温度、光照和海水Ω aragin之间的相关性，以解读每个参数的相对重要性。结果表明，珊瑚钙化率之间存在显著的季节差异，从夏季的最高值243 ± 58和274 ± 57 mmol CaCO3m − 2d − 1到冬季的最低值135 ± 39和101 ± 34 mmol CaCO3m − 2d − 1（P）。astreoids和D. strigosa，分别。我们还将小珊瑚菌落（n = 10）置于透明室中，并在相同的研究地点测量了光照和黑暗处理下的瞬时钙化率。结果表明，D. strigosa和P.无论是逐时还是逐季的星状藻对Ω arag都高度敏感。然而，我们认为这种高灵敏度是误导性的，因为光和Ω arag之间存在协方差，前者是钙化变异性的最强驱动因素。对于季节性数据，我们评估了观测到的季节性温度差异（4.0 ° C），光（5.1 mol光子m − 2d − 1），Ω arag（0.16单位）对珊瑚生长率的影响，并发现它们分别占约44%、52%和5%，81 ± 14 mmol CaCO3m − 2d − 1的季节变化。利用短期光照和黑暗孵育，我们展示了光照和Ω arc的协方差如何导致错误的结论，即钙化对Ω arc比实际更敏感。
Experimental studies have shown that coral calcification rates are dependent on light, nutrients, food availability, temperature, and seawater aragonite saturation (Ωarag), but the relative importance of each parameter in natural settings remains uncertain. In this study, we applied Calcein fluorescent dyes as time indicators within the skeleton of coral colonies (n= 3) ofPorites astreoidesandDiploria strigosaat three study sites distributed across the northern Bermuda coral reef platform. We evaluated the correlation between seasonal average growth rates based on coral density and extension rates with average temperature, light, and seawaterΩaragin an effort to decipher the relative importance of each parameter. The results show significant seasonal differences among coral calcification rates ranging from summer maximums of 243 ± 58 and 274 ± 57 mmol CaCO3m−2d−1to winter minimums of 135 ± 39 and 101 ± 34 mmol CaCO3m−2d−1forP. astreoidesandD. strigosa, respectively. We also placed small coral colonies (n= 10) in transparent chambers and measured the instantaneous rate of calcification under light and dark treatments at the same study sites. The results showed that the skeletal growth ofD. strigosaandP. astreoides, whether hourly or seasonal, was highly sensitive toΩarag. We believe this high sensitivity, however, is misleading, due to covariance between light andΩarag, with the former being the strongest driver of calcification variability. For the seasonal data, we assessed the impact that the observed seasonal differences in temperature (4.0 °C), light (5.1 mol photons m−2d−1), andΩarag(0.16 units) would have on coral growth rates based on established relationships derived from laboratory studies and found that they could account for approximately 44, 52, and 5 %, respectively, of the observed seasonal change of 81 ± 14 mmol CaCO3m−2d−1. Using short-term light and dark incubations, we show how the covariance of light andΩaragcan lead to the false conclusion that calcification is more sensitive toΩaragthan it really is.