Community responses of intertidal foraminifera to pH variations: a culture experiment with propagules
Community responses of intertidal foraminifera to pH variations: a culture experiment with propagules
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DOI：
10.1007/s10452-021-09833-w
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发表时间：
2021-03
期刊：
影响因子：
1.8
通讯作者：
A. Weinmann;S. Goldstein;M. Triantaphyllou;M. Langer
中科院分区：
文献类型：
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作者：
A. Weinmann;S. Goldstein;M. Triantaphyllou;M. Langer
底栖有孔虫等钙化生物易受海洋pH值和碱度变化的影响。对这些变化的反应包括死亡率、钙化率或组合成分的变化，这在实地和实验研究中已经观察到。在这里，我们应用了一个增长实验，底栖有孔虫繁殖在不同的pH值条件下，收集的见解pH值的组成上的增长组合的影响。一个均匀的繁殖体组合从当地的泥滩在科孚岛（希腊）暴露于一系列的pH值条件（6.5，7.2，7.8和8.5）为5周。在第二个实验中，组合体首先暴露于低条件，随后暴露于高条件，总共8周。实验结束后，我们记录了整个处理过程中的高存活率和生长。第一个实验的组合物的分析显示，从porcelaneous为主的类群在较高的pH值的治疗组合，在较低的pH值的治疗凝集类群的数量较高的转变。软壳单性种普遍贯穿。第二个实验揭示了组合，显着占主导地位的porcelaneous类群与monothalamous类群几乎缺席。这项研究的结果是一致的，从实验室和现场研究的pH值变化的组合成分与其他意见。通过激活潜在的休眠繁殖体的组合的快速反应，增加了对自然变化的环境，如河口季节性组成变化背后的机制的见解。他们还揭示了未来海洋pH值持续下降对浅水有孔虫组合的可能影响。
Calcifying organisms such as benthic foraminifera are susceptible to changes in ocean pH and alkalinity. Responses to these changes include variations in mortality, calcification rates or assemblage composition, which have been observed in field and experimental studies. Here we applied a growth experiment with benthic foraminiferal propagules under different pH conditions to gather insights into the effect of pH on the composition of grown assemblages. A homogeneous propagule assemblage from a local mudflat in Corfu Island (Greece) was exposed to a range of pH conditions (6.5, 7.2, 7.8 and 8.5) for 5 weeks. In a second experiment, the assemblages were first exposed to low and subsequently to high conditions for a total of 8 weeks. After termination of the experiments, we recorded high survivability and growth throughout the treatments. Analysis of the assemblage composition of the first experiments revealed a shift from porcelaneous dominated taxa in the higher pH treatments to an assemblage with higher numbers of agglutinated taxa in the lower pH treatments. Soft-shelled monothalamous species were common throughout. The second experiment revealed assemblages that were significantly dominated by porcelaneous taxa with monothalamous taxa being almost absent. The results of this study are congruent with other observations on changing assemblage compositions with changing pH from both laboratory and field studies. The fast response of the assemblages through activation of potentially dormant propagules adds insights into the mechanisms behind seasonal composition changes in naturally variable environments such as river estuaries. They also shed new light on possible effects of continuous decreases in ocean pH on shallow-water foraminiferal assemblages in future.