The relationship between thermal spatial variability and mean temperature alters movement and population dynamics

The relationship between thermal spatial variability and mean temperature alters movement and population dynamics
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热空间变异与平均温度之间的关系改变了迁徙和人口动态

DOI:
10.1002/ecs2.4254
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发表时间:
2022
期刊:
影响因子:
2.7
通讯作者:
Fey, Samuel B.
Fey, Samuel B.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Schuman, Isaac J.;Meier, Hannah S.;Layden, Tamara J.;Fey, Samuel B.

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空间和时间环境变化在塑造生态系统动态方面的重要性已得到充分认识,但动态空间变化的生态后果,即空间变化的时间模式,仍未得到解决。在这里,我们通过实验生成随时间波动的热环境,这些环境在平均空间环境温度和热空间异质性程度之间具有负、正或中性关系。我们使用能动的绿藻莱茵衣藻检验了这样的假设:相对于昼夜温度周期的空间变化时间可以有意义地改变运动模式和种群动态。我们的结果表明C.相对于在空间变异与平均温度呈负相关的环境中生长的个体,在空间变异与平均温度之间呈正相关的环境中生长的个体表现出种群增长率降低、转向角度减小所表明的更定向运动以及随着时间的推移负趋热性降低。我们还通过收集美国华盛顿州圣海伦斯山流域五个池塘的夏季水温测量值,记录了自然空间变化动态的显着区域变化。我们的结果总体表明,在更广泛的时空变化交织结构中,空间变化的动态是一个未被充分认识但显着的特征。
The importance of spatial and temporal environmental variation in shaping ecosystem dynamics is well appreciated, yet the ecological consequences of dynamic spatial variability, that is, the temporal patterning of spatial variation, remain unresolved. Here, we experimentally generate temporally fluctuating thermal environments that have either a negative, positive, or neutral relationship between the mean spatial environmental temperature and the degree of thermal spatial heterogeneity. We test the hypothesis that the timing of spatial variation relative to diel temperature cycles can meaningfully alter movement patterns and population dynamics, using the motile green algaeChlamydomonas reinhardtii. Our results indicate thatC. reinhardtiiindividuals growing in environments with positive relationships between spatial variability and mean temperature show reduced population growth rates, more directed movement as indicated by a reduced turning angle, and decreased negative thermotaxis over time, relative to those growing in environments with a negative relationship between spatial variability and mean temperature. We additionally document substantial regional variation in the dynamics of natural spatial variability by collecting summer water temperature measurements from five ponds in the Mount Saint Helens watershed, WA, USA. Our results collectively suggest that the dynamics of spatial variation are an underappreciated but salient feature within the broader interwoven fabric of spatiotemporal variation.
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DOI: --
发表时间: 1983
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