Contrasting calcification responses to ocean acidification between two reef foraminifers harboring different algal symbionts
Contrasting calcification responses to ocean acidification between two reef foraminifers harboring different algal symbionts
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DOI：
10.1029/2011gl048501
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发表时间：
2011-10-06
影响因子：
5.2
通讯作者：
Kawahata, Hodaka
中科院分区：
文献类型：
--
作者：
Hikami, Mana;Ushie, Hiroyuki;Kawahata, Hodaka
与全球变暖一样，海洋酸化是人为二氧化碳排放的结果，严重影响海洋钙化生物，特别是生活在珊瑚礁生态系统中的生物。然而，尽管珊瑚的反应通常是负面的，但关于珊瑚礁钙化物对海洋酸化反应的了解却相当有限。在使用两种藻类共生体、礁石栖息有孔虫 Amphisorus kudakajimensis 和 Calcarina gaudichaudii 进行的培养实验中，在五种不同的 pCO(2) 条件（245、375、588、763 和 907 mu atm）的海水中，采用精确的 pCO(2) 控制技术维持，A. kudakajimensis 在较高的 pCO(2) 下减少，而 C. gaudichaudii 的钙化通常随着 pCO(2) 的增加而增加。在另一项在碳酸氢根离子浓度恒定的海水中进行的培养实验中，在与 A. kudakajimensis 密切相关的物种 Amphisorus hemprichii 或 C. gaudichaudii 中，处理之间的钙化没有显着差异。根据这些结果，我们得出结论，碳酸根离子和 CO2 分别是对 Amphisorus 和 Calcarina 生长影响最大的碳酸盐物种。这两个有孔虫属的相反反应可能反映了对这些碳酸盐物种的不同敏感性，这可能是由于它们不同的共生藻类所致。引文：Hikami, M.、H. Ushie、T. Irie、K. Fujita、A. Kuroyanagi、K. Sakai、Y. Nojiri、A. Suzuki 和 H. Kawahata (2011)，对比两种含有不同藻类共生体的礁石有孔虫对海洋酸化的钙化反应，地球物理学。资源。 Lett.，38，L19601，doi：10.1029/2011GL048501。
Ocean acidification, which like global warming is an outcome of anthropogenic CO2 emissions, severely impacts marine calcifying organisms, especially those living in coral reef ecosystems. However, knowledge about the responses of reef calcifiers to ocean acidification is quite limited, although coral responses are known to be generally negative. In a culture experiment with two algal symbiont-bearing, reef-dwelling foraminifers, Amphisorus kudakajimensis and Calcarina gaudichaudii, in seawater under five different pCO(2) conditions, 245, 375, 588, 763 and 907 mu atm, maintained with a precise pCO(2)-controlling technique, net calcification of A. kudakajimensis was reduced under higher pCO(2), whereas calcification of C. gaudichaudii generally increased with increased pCO(2). In another culture experiment conducted in seawater in which bicarbonate ion concentrations were varied under a constant carbonate ion concentration, calcification was not significantly different between treatments in Amphisorus hemprichii, a species closely related to A. kudakajimensis, or in C. gaudichaudii. From these results, we concluded that carbonate ion and CO2 were the carbonate species that most affected growth of Amphisorus and Calcarina, respectively. The opposite responses of these two foraminifer genera probably reflect different sensitivities to these carbonate species, which may be due to their different symbiotic algae. Citation: Hikami, M., H. Ushie, T. Irie, K. Fujita, A. Kuroyanagi, K. Sakai, Y. Nojiri, A. Suzuki, and H. Kawahata (2011), Contrasting calcification responses to ocean acidification between two reef foraminifers harboring different algal symbionts, Geophys. Res. Lett., 38, L19601, doi: 10.1029/2011GL048501.