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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Evidence for different thermal ecotypes in range centre and trailing edge kelp populations
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Evidence for different thermal ecotypes in range centre and trailing edge kelp populations

机译：范围中心和后缘海带种群不同热生态型的证据

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摘要

Determining and predicting species' responses to climate change is a fundamental goal of contemporary ecology. When interpreting responses to warming species are often treated as a single physiological unit with a single species-wide thermal niche. This assumes that trailing edge populations are most vulnerable to warming, as it is here where a species' thermal niche will be exceeded first. Local adaptation can, however, result in narrower thermal tolerance limits for local populations, so that similar relative increases in temperature can exceed local niches throughout a species range. We used a combination of common garden temperature heat-shock experiments (8-32 degrees C) and population genetics (microsatellites) to identify thermal ecotypes of northeast Atlantic range centre and trailing edge populations of the habitat-forming kelp, Laminaria digitata. Using upregulation of hsp70 as an indicator of thermal stress, we found that trailing edge populations were better equipped to tolerate acute temperature shocks. This pattern was consistent across seasons, indicating that between-population variability is fixed. High genetic structuring was also observed, with range centre and trailing edge populations representing highly distinct clusters with little gene flow between regions. Taken together, this suggests the presence of distinct thermal ecotypes for L. digitate, which may mean responses to future warming are more complex than linear range contractions.
机译：确定和预测物种对气候变化的反应是当代生态的基本目标。当解释对加热物种的响应时通常被用单个物种宽的热力水晶作为单一生理单元。这假设后缘群体最容易变暖，因为它在这里将首先超过物种的热力利基。然而，局部适应可以导致局部种群的热容差限制较窄，因此温度相似的相对增加可以超过在整个物种范围内的局部利基。我们使用共同的庭院温度热休克实验（8-32℃）和群体遗传学（微卫星）的组合来识别东北大西洋范围中心的热生态型和栖息地形成海带的栖息地山脉，Laminaria Digitata。利用HSP70的上调作为热应力的指标，我们发现尾部填充能够更好地提供急性温度冲击。这种模式在季节一致，表明 - 人口之间的变异性是固定的。还观察到高遗传结构，范围中心和尾随群体，代表高度不同的簇，在地区之间具有很少的基因流动。连同，这表明L. Digiting的不同热生态型的存在，这可能意味着对未来变暖的反应比线性范围收缩更复杂。

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