Experimental evidence of the synergistic effects of warming and invasive algae on a temperate reef-builder coral.
Experimental evidence of the synergistic effects of warming and invasive algae on a temperate reef-builder coral.
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变暖和浸润性藻类对温带珊瑚礁建造者珊瑚的协同作用的实验证据。
DOI：
10.1038/srep18635
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发表时间：
2015-12-22
影响因子：
4.6
通讯作者：
Linares C
中科院分区：
文献类型：
--
作者：
Kersting DK;Cebrian E;Casado C;Teixidó N;Garrabou J;Linares C
在当前的全球气候变化情景中，应激源在空间和时间上重叠，迫切需要了解它们相互作用的影响，以了解和预测生物体的反应和弹性。在许多其他底栖生物中，珊瑚受到越来越多与全球变化有关的压力的影响，包括变暖和入侵物种。在这项研究中，实验评估了气候变暖和入侵藻类对温带造礁珊瑚簇枝状珊瑚的累积影响。我们首先研究了两个不同热史和坏死史的远方人群对热应激的潜在局部适应。不同种群间无显著差异。两个种群的菌落在长期暴露在高达29 °C的温度后没有出现坏死。第二，我们测试了气候变暖和入侵藻类存在的相互作用的影响。联合暴露引发了对光合作用效率和组织坏死的关键协同效应。实验结束时，90%以上的菌落受到气候变暖和入侵藻类的影响，出现了坏死的迹象。考虑到极端气候事件的预测增加以及未来入侵物种在地中海和其他海域的传播，这一结果尤其令人担忧。
In the current global climate change scenario, stressors overlap in space and time, and knowledge on the effects of their interaction is highly needed to understand and predict the response and resilience of organisms. Corals, among many other benthic organisms, are affected by an increasing number of global change-related stressors including warming and invasive species. In this study, the cumulative effects between warming and invasive algae were experimentally assessed on the temperate reef-builder coral Cladocora caespitosa. We first investigated the potential local adaptation to thermal stress in two distant populations subjected to contrasting thermal and necrosis histories. No significant differences were found between populations. Colonies from both populations suffered no necrosis after long-term exposure to temperatures up to 29 °C. Second, we tested the effects of the interaction of both warming and the presence of invasive algae. The combined exposure triggered critical synergistic effects on photosynthetic efficiency and tissue necrosis. At the end of the experiment, over 90% of the colonies subjected to warming and invasive algae showed signs of necrosis. The results are of particular concern when considering the predicted increase of extreme climatic events and the spread of invasive species in the Mediterranean and other seas in the future.