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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中不同热生态类型的证据

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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响应是当代生态学的基本目标。在解释对变暖物种的反应时，通常将其视为具有单个物种范围的热位的单个生理单位。假设后缘种群最容易变暖，因为在这里首先会超过物种的热生态位。但是，局部适应可能导致局部种群的热耐受极限范围变窄，因此类似的相对温度升高可能超过整个物种范围内的局部生态位。我们结合了常见的花园温度热休克实验（8-32摄氏度）和种群遗传学（微卫星），确定了东北大西洋范围中心和生境形成海带海带海带的后缘种群的热生态型。使用hsp70的上调作为热应激的指标，我们发现后缘种群具有更好的耐受急性温度冲击的能力。整个季节这种模式是一致的，这表明种群之间的差异是固定的。还观察到高遗传结构，范围中心和后缘种群代表高度不同的簇，区域之间的基因流很小。两者合计，这表明存在针对数指乳杆菌的不同热生态型，这可能意味着对未来变暖的响应比线性范围收缩更为复杂。

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  • 来源
    《Journal of Experimental Marine Biology and Ecology》 |2019年第mayajun期|10-17|共8页
  • 作者

    King Nathan G.; McKeown Niall J.; Smale Dan A.; Wilcockson David C.; Hoelters Laura; Groves Emily A.; Stamp Thomas; Moore Pippa J.;

  • 作者单位

    Bangor Univ, Ctr Appl Marine Sci, Menai Bridge LL59 5AB, Gwynedd, Wales|Aberystwyth Univ, Inst Biol Environm & Rural Sci, Aberystwyth SY23 3DA, Dyfed, Wales;

    Aberystwyth Univ, Inst Biol Environm & Rural Sci, Aberystwyth SY23 3DA, Dyfed, Wales;

    Marine Biol Assoc UK, Citadel Hill, Plymouth PL1 2PB, Devon, England;

    Aberystwyth Univ, Inst Biol Environm & Rural Sci, Aberystwyth SY23 3DA, Dyfed, Wales;

    Aberystwyth Univ, Inst Biol Environm & Rural Sci, Aberystwyth SY23 3DA, Dyfed, Wales;

    Bangor Univ, Ctr Appl Marine Sci, Menai Bridge LL59 5AB, Gwynedd, Wales;

    Plymouth Univ, Sch Biol & Marine Sci, Plymouth PL4 8AA, Devon, England;

    Aberystwyth Univ, Inst Biol Environm & Rural Sci, Aberystwyth SY23 3DA, Dyfed, Wales|Edith Cowan Univ, Sch Nat Sci, Ctr Marine Ecosyst Res, Joondalup, WA 6027, Australia;

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  • 关键词

    Laminaria digitata; Range-centre; Trailing-edge; Climate change; Heat shock;

    机译：Laminaria digitata;范围中心;后缘;气候变化;热休克;

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