Community calcification in Lizard Island, Great Barrier Reef: a 33 year perspective
Community calcification in Lizard Island, Great Barrier Reef: a 33 year perspective
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大堡礁蜥蜴岛的群落钙化：33 年的展望
DOI：
10.1016/j.gca.2014.09.011
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发表时间：
2014
影响因子：
5
通讯作者：
K. Caldeira
中科院分区：
文献类型：
--
作者：
J. Silverman;K. Schneider;D. Kline;T. Rivlin;A. Rivlin;S. Hamylton;B. Lazar;J. Erez;K. Caldeira
2008年9月至2009年10月期间，在澳大利亚大堡礁吕宋岛的一个礁坪上进行了群落钙化（Gnet）的测量，距离1975年LIMER探险队首次测量已有33年。在2008年和2009年，我们分别测量了Gnet = 61 ± 12和54 ± 13 mmol CaCO 3 m −2·day−1。这些比率比1975-76年同期测量的比率低27-49%。这些利率同意以及从测量的温度和程度的文石饱和度使用的珊瑚礁钙化速率方程从观察在红海珊瑚礁的估计。在我们的研究中，使用1978年采用的相同方法对吕宋岛珊瑚礁坪的群落结构进行了调查，结果表明活珊瑚覆盖率没有显著变化（1.8%）。然而，应注意的是，在这项研究和1978年的活珊瑚覆盖率估计中，不确定性相当大，这是这种方法所固有的。使用珊瑚礁钙化率方程，同时假设珊瑚礁上方的海水与大气中的PCO 2处于平衡状态，并且考虑到活珊瑚覆盖率没有变化，自LIMER研究以来，Gnet应该下降了30 ± 8%。然而，我们注意到，由于珊瑚覆盖率测量的不确定性，相对于1970年代，估计Gnet减少的误差可能要大得多。尽管如此，预测和测量的减少之间的相似性在全球变暖表明，海洋酸化可能是较低的CaCO 3沉淀率在吕宋岛礁坪的主要原因。
Measurements of community calcification (Gnet) were made during September 2008 and October 2009 on a reef flat in Lizard Island, Great Barrier Reef, Australia, 33 years after the first measurements were made there by the LIMER expedition in 1975. In 2008 and 2009 we measuredGnet= 61 ± 12 and 54 ± 13 mmol CaCO3m−2·day−1, respectively. These rates are 27–49% lower than those measured during the same season in 1975–76. These rates agree well with those estimated from the measured temperature and degree of aragonite saturation using a reef calcification rate equation developed from observations in a Red Sea coral reef. Community structure surveys across the Lizard Island reef flat during our study using the same methods employed in 1978 showed that live coral coverage had not changed significantly (∼8%). However, it should be noted that the uncertainty in the live coral coverage estimates in this study and in 1978 were fairly large and inherent to this methodology. Using the reef calcification rate equation while assuming that seawater above the reef was at equilibrium with atmospheric PCO2and given that live coral cover had not changedGnetshould have declined by 30 ± 8% since the LIMER study as indeed observed. We note, however, that the error in estimatedGnetdecrease relative to the 1970’s could be much larger due to the uncertainties in the coral coverage measurements. Nonetheless, the similarity between the predicted and the measured decrease inGnetsuggests that ocean acidification may be the primary cause for the lower CaCO3precipitation rate on the Lizard Island reef flat.