Global warming-enhanced stratification and mass mortality events in the Mediterranean
Global warming-enhanced stratification and mass mortality events in the Mediterranean
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DOI：
10.1073/pnas.0805801106
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发表时间：
2009-04-14
影响因子：
11.1
通讯作者：
Pascual, Josep
中科院分区：
文献类型：
--
作者：
Coma, Rafel;Ribes, Marta;Pascual, Josep
地中海夏季的特点是温度高，食物供应少。由于能量限制，这导致许多底栖悬浮物的“夏季休眠”。对最近33年温度时间序列的分析表明，由于全球变暖，分层加剧，导致夏季条件延长了约40%。预计许多生物过程将受到这一趋势的影响，最终导致无脊椎动物大量死亡。伴随这些事件发生的气候异常表明，长时间暴露在更温暖的夏季条件下，加上食物资源减少。这些条件对模式生物影响的模拟表明，生物量损失约为35%。这种程度的损失导致的死亡率与在大规模死亡事件期间实地观察到的死亡率相似。这些结果表明，温度异常是这些事件的根本原因，而能量约束是主要的触发机制。
Summer conditions in the Mediterranean Sea are characterized by high temperatures and low food availability. This leads to "summer dormancy'' in many benthic suspension feeders due to energetic constraints. Analysis of the most recent 33-year temperature time series demonstrated enhanced stratification due to global warming, which produced a approximate to 40% lengthening of summer conditions. Many biological processes are expected to be affected by this trend, culminating in such events as mass mortality of invertebrates. Climatic anomalies concomitant with the occurrence of these events represent prolonged exposure to warmer summer conditions coupled with reduced food resources. Simulation of the effects of these conditions on a model organism demonstrated a biomass loss of > 35%. Losses of this magnitude result in mortality similar to that noted in field observations during mass mortality events. These results indicate that temperature anomalies are the underlying cause of the events, with energetic constraints serving as the main triggering mechanism.