PDF(Pubmed)
Abstract：
Record mean sea surface temperatures (SST) during the past decades and marine heatwaves have been identified as responsible for severe impacts on marine ecosystems, but the role of changes in the patterns of temporal variability under global warming has been much less studied. We compare descriptors of two time series of SST, encompassing extirpations (i.e. local extinctions) of six cold-temperate macroalgae species at their trailing range edge. We decompose the effects of gradual warming, extreme events and intrinsic variability (e.g. seasonality). We also relate the main factors determining macroalgae range shifts with their life cycles characteristics and thermal tolerance. We found extirpations of macroalgae were related to stretches of coast where autumn SST underwent warming, increased temperature seasonality, and decreased skewness over time. Regardless of the species, the persisting populations shared a common environmental domain, which was clearly differentiated from those experiencing local extinction. However, macroalgae species responded to temperature components in different ways, showing dissimilar resilience. Consideration of multiple thermal manifestations of climate change is needed to better understand local extinctions of habitat-forming species. Our study provides a framework for the incorporation of unused measures of environmental variability while analyzing the distributions of coastal species.
摘要：
在过去的几十年中，记录了平均海面温度（SST），并且海洋热浪已被确定为对海洋生态系统造成严重影响的原因。但是对全球变暖下时间变化模式的作用的研究却很少。我们比较了两个SST时间序列的描述符，包括六种寒温带大型藻类在其后缘的灭绝（即局部灭绝）。我们分解了逐渐变暖的影响，极端事件和内在变异性(如季节性)。我们还将决定大型藻类范围变化的主要因素与其生命周期特征和耐热性联系起来。我们发现大型藻类的灭绝与秋季SST变暖的海岸延伸有关，温度季节性增加，随着时间的推移，偏斜度降低。不管是什么物种,持续存在的人口共享一个共同的环境领域，这与经历局部灭绝的人明显不同。然而,大型藻类物种以不同的方式对温度成分做出反应，表现出不同的韧性。需要考虑气候变化的多种热表现，以更好地了解形成栖息地的物种的局部灭绝。我们的研究为在分析沿海物种分布的同时纳入未使用的环境变异性措施提供了框架。
