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Diminished warming tolerance and plasticity in low-latitude populations of a marine gastropod
Conservation Physiology ( IF 2.7 ) Pub Date : 2021-05-13 , DOI: 10.1093/conphys/coab039
Andrew R Villeneuve 1, 2 , Lisa M Komoroske 1, 2 , Brian S Cheng 1, 2
Affiliation  

Models of species response to climate change often assume that physiological traits are invariant across populations. Neglecting potential intraspecific variation may overlook the possibility that some populations are more resilient or susceptible than others, creating inaccurate predictions of climate impacts. In addition, phenotypic plasticity can contribute to trait variation and may mediate sensitivity to climate. Quantifying such forms of intraspecific variation can improve our understanding of how climate can affect ecologically important species, such as invasive predators. Here, we quantified thermal performance (tolerance, acclimation capacity, developmental traits) across seven populations of the predatory marine snail (Urosalpinx cinerea) from native Atlantic and non-native Pacific coast populations in the USA. Using common garden experiments, we assessed the effects of source population and developmental acclimation on thermal tolerance and developmental traits of F1 snails. We then estimated climate sensitivity by calculating warming tolerance (thermal tolerance − habitat temperature), using field environmental data. We report that low-latitude populations had greater thermal tolerance than their high latitude counterparts. However, these same low-latitude populations exhibited decreased thermal tolerance when exposed to environmentally realistic higher acclimation temperatures. Low-latitude native populations had the greatest climate sensitivity (habitat temperatures near thermal limits). In contrast, invasive Pacific snails had the lowest climate sensitivity, suggesting that these populations are likely to persist and drive negative impacts on native biodiversity. Developmental rate significantly increased in embryos sourced from populations with greater habitat temperature but had variable effects on clutch size and hatching success. Thus, warming can produce widely divergent responses within the same species, resulting in enhanced impacts in the non-native range and extirpation in the native range. Broadly, our results highlight how intraspecific variation can alter management decisions, as this may clarify whether management efforts should be focused on many or only a few populations.

中文翻译:

海洋腹足动物低纬度种群的变暖耐受性和可塑性降低

物种对气候变化的反应模型通常假设生理特征在种群中是不变的。忽略潜在的种内变异可能会忽略某些种群比其他种群更具弹性或易感性的可能性,从而对气候影响做出不准确的预测。此外,表型可塑性可以促成性状变异,并可能调节对气候的敏感性。量化这种形式的种内变异可以提高我们对气候如何影响生态重要物种(例如入侵性捕食者)的理解。在这里,我们量化了来自美国本土大西洋和非本土太平洋沿岸种群的 7 个捕食性海洋蜗牛 (Urosalpinx cinerea) 种群的热性能(耐受性、适应能力、发育特征)。使用常见的花园实验,我们评估了源种群和发育适应对 F1 蜗牛耐热性和发育性状的影响。然后,我们通过使用现场环境数据计算变暖耐受性(耐热性 - 栖息地温度)来估计气候敏感性。我们报告说,低纬度种群比高纬度种群具有更大的耐热性。然而,这些相同的低纬度种群在暴露于环境现实的较高适应温度时表现出降低的耐热性。低纬度土著居民对气候的敏感性最高(栖息地温度接近热极限)。相比之下,入侵太平洋蜗牛的气候敏感性最低,表明这些种群可能会持续存在并对本地生物多样性产生负面影响。来自具有较高栖息地温度的种群的胚胎的发育速度显着增加,但对离合器大小和孵化成功率有不同的影响。因此,变暖可以在同一物种内产生广泛不同的反应,从而导致对非本地范围的影响增强和本地范围的灭绝。从广义上讲,我们的结果强调了种内变异如何改变管理决策,因为这可以阐明管理工作应该集中在许多种群还是只集中在少数种群上。变暖可以在同一物种内产生广泛不同的反应,从而导致对非本地范围的影响增强和本地范围的灭绝。从广义上讲,我们的结果强调了种内变异如何改变管理决策,因为这可以阐明管理工作应该集中在许多种群还是只集中在少数种群上。变暖可以在同一物种内产生广泛不同的反应,从而导致对非本地范围的影响增强和本地范围的灭绝。从广义上讲,我们的结果强调了种内变异如何改变管理决策,因为这可以阐明管理工作应该集中在许多种群还是只集中在少数种群上。
更新日期:2021-05-13
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