Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification.
Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification.
复制标题
DOI：
10.1038/s41598-017-08003-z
复制
发表时间：
2017-08-08
影响因子：
4.6
通讯作者：
McCulloch MT
中科院分区：
文献类型：
--
作者：
Comeau S;Cornwall CE;McCulloch MT
评估导致不同物种对海水pH值下降的不同敏感性的因素，对于了解海洋酸化影响珊瑚钙化的机制至关重要。我们报告了一项实验结果，比较了珊瑚Acropora yongei和Pocillopora Damicoris对不同pH水平(8.09、7.81和7.63)在8周内的反应。在pH值为7.63的条件下，杨氏沼虾的钙化减少了35%，而斑角沙门氏菌的钙化未受影响。用δ11B系统学方法测定了钙化液的pH值(PH Cf)，两种藻类的pH cf均随海水pH的升高而略有下降，其中斑角对虾的下降更为明显。用地球化学指标(B/Ca和δ11B)估算了钙化部位的溶解无机碳浓度(DICcf)，发现其浓度是海水溶解无机碳浓度的两倍，并随着海水pH的降低而增加。因此，钙化部位的饱和状态(Ωcf)的下降部分被DICcf的增加所减缓。这些结果表明，尽管PHCf、DICcf和Ωcf在成矿过程中很重要，但一些珊瑚能够保持其钙化速率，尽管它们的钙化流体碳酸盐化学发生了变化。
Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the coral Acropora yongei and Pocillopora damicornis to differing pH levels (8.09, 7.81, and 7.63) over an 8-week period. Calcification of A. youngei was reduced by 35% at pH 7.63, while calcification of P. damicornis was unaffected. The pH in the calcifying fluid (pHcf) was determined using δ11B systematics, and for both species pHcf declined slightly with seawater pH, with the decrease being more pronounced in P. damicornis. The dissolved inorganic carbon concentration at the site of calcification (DICcf) was estimated using geochemical proxies (B/Ca and δ11B) and found to be double that of seawater DIC, and increased in both species as seawater pH decreased. As a consequence, the decline of the saturation state at the site of calcification (Ωcf) with OA was partially moderated by the DICcf increase. These results highlight that while pHcf, DICcf and Ωcf are important in the mineralization process, some corals are able to maintain their calcification rates despite shifts in their calcifying fluid carbonate chemistry.
登录
查看更多内容
影响因子：
3.5
作者：
Cohen, Anne L.;McCorkle, Daniel C.;Rose, Kathryn A.
通讯作者：
Rose, Kathryn A.
影响因子：
4.5
作者：
Comeau, S.;Edmunds, P. J.;Carpenter, R. C.
通讯作者：
Carpenter, R. C.
DOI：
10.1073/pnas.1505586112
发表时间：
2015-10-27
影响因子：
11.1
作者：
Georgiou, Lucy;Falter, James;McCulloch, Malcolm
通讯作者：
McCulloch, Malcolm
影响因子：
3.9
作者：
Holcomb, M.;DeCarlo, T. M.;McCulloch, M.
通讯作者：
McCulloch, M.
影响因子：
30.7
作者：
Fabricius, Katharina E.;Langdon, Chris;Lough, Janice M.
通讯作者：
Lough, Janice M.