Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
The combination of global warming and local stressors can have dramatic consequences on freshwater biota. Sediment deposition is an important pressure that can affect benthic species and benthic ontogenetic stages (eggs and larvae) habitat quality. However, knowledge on the effects of sediment in a warming context is lacking. We used a common garden approach to examine the effects of combined exposure to elevated temperature and deposited sediment on early life history traits in offspring of four wild Arctic char (Salvelinus alpinus) populations, originating from geographically isolated lakes at the southern edge of the species range. We report interactive effects of temperature and sediment, with higher temperature exacerbating the negative effects of sediments on the duration of the incubation period and on the body size – yolk expenditure trade-off during development. Our results highlight that reevaluating the impacts of sediment on organisms under the lens of global warming and at the scale of several wild populations is needed to improve our understanding of how vulnerable species can respond to environmental changes.

中文翻译：

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升高的温度和沉积的沉积物共同影响最南端的北极红点鲑种群的早期生活史特征

《加拿大渔业和水生科学杂志》，印刷前。
全球变暖和局部压力源的结合可能对淡水生物群产生重大影响。沉积物沉积是一个重要的压力，可能会影响底栖物种和底栖生物形成阶段（蛋和幼虫）的生境质量。但是，缺乏关于变暖背景下沉积物影响的知识。我们使用一种常见的花园方法来研究高温和沉积沉积物的组合暴露对四个野生北极红点鲑（Salvelinus alpinus）种群后代早期生命历史特征的影响，这些种群起源于物种范围南缘的地理上孤立的湖泊。我们报告温度和沉积物的交互作用，较高的温度加剧了沉积物对潜伏期持续时间以及对身体大小的负面影响-在发育过程中蛋黄支出需要权衡。我们的结果表明，需要在全球变暖的背景下以及在几个野生种群的规模上重新评估沉积物对生物的影响，以增进我们对脆弱物种如何应对环境变化的理解。