Indirect effects may buffer negative responses of seagrass invertebrate communities to ocean acidification
Indirect effects may buffer negative responses of seagrass invertebrate communities to ocean acidification
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DOI：
10.1016/j.jembe.2014.07.011
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发表时间：
2014-12-01
影响因子：
2
通讯作者：
Buia, M. Cristina
中科院分区：
文献类型：
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作者：
Garrard, Samantha L.;Gambi, M. Cristina;Buia, M. Cristina
海洋酸化已被证明具有高度可变的影响，个别物种有许多负面和一些正面的反应，而社区一级的影响基本上是未知的。虽然预计生物多样性将全面丧失，但预测海洋酸化对整个生物组合的影响可能是有问题的，因为必须考虑到酸化的直接和间接影响。这项研究表明，无脊椎动物组合与高产海草，Posidonia oceanica，响应自然酸化发生在二氧化碳喷口关闭意大利海岸。我们研究了无脊椎动物群落结构的季节性差异之间的两个不同的pH值区：控制（pH值8.1）和酸化（pH值7.8），并表明，许多组的无脊椎动物类群是强大的酸化效应。社区结构的差异似乎是由酸化的间接影响，如冠层结构和食物供应的变化，而不是生理不耐受低pH值。在酸化站收集的无脊椎动物的数量几乎是控制站的两倍，在研究过程中，许多严重钙化的物种似乎茁壮成长。这些结果突出了积极的间接影响如何缓冲酸化的生态影响，并提供证据表明，这种高产的近岸栖息地可能为其相关社区提供避难所，使其免受未来海洋酸化的影响。(C)2014爱思唯尔有限公司版权所有。
Ocean acidification has been shown to have highly variable effects, with many negative and some positive responses from individual species, while community level effects are largely unknown. Although an overall loss of biodiversity is expected, predicting the effects of ocean acidification on whole assemblages can be problematic as both direct and indirect effects of acidification must be taken into consideration. This study demonstrates how invertebrate assemblages associated with the highly productive seagrass, Posidonia oceanica, respond to natural acidification that occurs at CO2 vents off the coast of Italy. We examined seasonal differences in invertebrate community structure between two distinct pH zones: control (pH 8.1) and acidified (pH 7.8) and show that many groups of invertebrate taxa were robust to acidification effects. Differences in community structure appeared to be driven by the indirect effects of acidification, such as changes to canopy structure and food availability, rather than physiological intolerance to low pH. The number of invertebrates collected in acidified stations was almost double that of control stations during the study and many heavily calcified species appeared to thrive. These results highlight how positive indirect effects may buffer the ecological impacts of acidification, and provide evidence that this highly productive, nearshore habitat may provide refuge to its associated communities from future ocean acidification. (C) 2014 Elsevier B.V. All rights reserved.