Glucocorticoid-environment relationships align with responses to environmental change in two co-occurring congeners
Glucocorticoid-environment relationships align with responses to environmental change in two co-occurring congeners
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DOI：
10.1002/eap.1781
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发表时间：
2018-10-01
影响因子：
5
通讯作者：
Lacey, Eileen A.
中科院分区：
文献类型：
--
作者：
Hammond, Talisin T.;Palme, Rupert;Lacey, Eileen A.
随着越来越多的物种因气候变化而发生范围转移，了解决定生物体实现生态位的因素变得越来越重要。非生物因素所施加的生理限制限制了许多物种的分布。由于糖皮质激素是必不可少的生理稳态的维持，确定糖皮质激素与环境的关系可能会产生关键的见解物种分布的限制和对环境变化的潜在反应。我们探讨了在过去的世纪中，两种花栗鼠在空间、遗传和形态变化上的差异模式，其基线糖皮质激素的变异性和对环境条件的敏感性之间的关系。具体而言，我们调查是否高山花栗鼠（塔米厄斯alpinus），这已经发生了显着的变化，显示更大的糖皮质激素的敏感性比lodgepole花栗鼠（T.speciosus），这表现出在相同的时间间隔变化不大的环境参数。从2013年到2015年，我们收集了这些物种的环境数据和粪便糖皮质激素代谢产物（FGM）样本。使用广义线性混合模型和模型平均法，我们研究了环境和个体表型参数对FGM的影响。我们发现明显的种间差异，与环境参数更好的预测FGM在高山赤眼蜂。在这个物种的FGM特别升高，在气候不太适合的栖息地，并在较高的最高日温度的地区。个别表型性状没有预测的FGM在高山赤眼蜂，虽然他们是高度预测的T. speciosus。总的来说，这些发现支持了高山赤眼蜂对环境变化更敏感的假设。更一般地说，我们的研究结果表明，表型属性和环境条件有助于FGM的反应，但这些因素的相对贡献不同类群，包括密切相关的物种。最后，我们的分析强调了糖皮质激素作为物种对环境变化敏感性的生物指标的价值，其中影响应激生理的因素已被评估。
As more species undergo range shifts in response to climate change, it is increasingly important to understand the factors that determine an organism's realized niche. Physiological limits imposed by abiotic factors constrain the distributions of many species. Because glucocorticoids are essential to the maintenance of physiological homeostasis, identifying glucocorticoid-environment relationships may generate critical insights into both limits on species distributions and potential responses to environmental change. We explored relationships between variability in baseline glucocorticoids and sensitivity to environmental conditions in two chipmunk species characterized by divergent patterns of spatial, genetic, and morphological change over the past century. Specifically, we investigated whether the alpine chipmunk (Tamias alpinus), which has undergone pronounced changes, displays greater glucocorticoid sensitivity to environmental parameters than the lodgepole chipmunk (T.speciosus), which has exhibited little change over the same interval. From 2013 to 2015, we collected environmental data and fecal glucocorticoid metabolite (FGM) samples from these species. Using generalized linear mixed models and a model averaging approach, we examined the impacts of environmental and individual phenotypic parameters on FGMs. We found pronounced interspecific differences, with environmental parameters being better predictors of FGMs in T.alpinus. FGMs in this species were particularly elevated in less climatically suitable habitats and in areas with higher maximum daily temperatures. Individual phenotypic traits were not predictive of FGMs in T.alpinus, although they were highly predictive for T.speciosus. Collectively, these findings support the hypothesis that T.alpinus is more sensitive to environmental change. More generally, our results suggest that both phenotypic attributes and environmental conditions contribute to FGM responses but that the relative contributions of these factors differ among taxa, including among closely related species. Finally, our analyses underscore the value of glucocorticoids as bioindicators of sensitivity to environmental change in species for which the factors affecting stress physiology have been assessed.