Spatial scale influences relationships between indices of organisms’ thermal tolerance

IF 2.9 2区 生物学 Q2 BIOLOGY
Beatrice S. Dewenter , Jane Hughes , Alisha A. Shah , Stephanie Bristow , N. LeRoy Poff , Ross Thompson , Ben J. Kefford
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Abstract

Many thermal vulnerability indices potentially describe organismal responses to climate. However, the inter-relationships among indices and the effects of body size and spatial scale are mostly unknown. Existing literature on relationships between indices remains unclear, e.g. different hypotheses predict no, positive or negative relationship between critical thermal minimum and maximum (CTmin and CTmax). We used phylogenetic corrected analysis to determine relationships between CTmin, CTmax, thermal breadth (=CTmax-CTmin), warming tolerance (=CTmax-annual mean habitat temperature), warming capacity (=CTmax-annual maximum habitat temperature) and organism size in 121 species of freshwater insects (Ephemeroptera, Plecoptera and Trichoptera) from temperate and tropical streams distributed along elevation gradients in eastern Australia. When data were collated across all sites (i.e. both elevation gradients), CTmin and CTmax were positively related, indicating a trade-off between tolerating high and low temperatures at this multi-region spatial scale. However, within each gradient, these indices were uncorrelated, indicating that tolerance to high temperatures had no effect on tolerance to low temperatures and vice versa at this within-region scale. All pairs of variables, except CTmax and body size, were related (either positively or negatively) in one or more of the three datasets. Inconsistent relationships across sites in both the temperate and the tropical gradients occurred in 43 % of variable pairs. Hypotheses about the direction of relationships between pairs of variables were supported consistently in 50 % of the contrasts. While the variables examined are mostly related to each other, spatial scale is important in determining the nature of that relationship.

Abstract Image

空间尺度影响生物热耐受性指标之间的关系
许多热脆弱性指数可能描述生物体对气候的反应。然而,各指数之间的相互关系以及体型和空间尺度的影响大多是未知的。现有文献对各指标之间的关系尚不清楚,例如不同的假设预测临界热极小值和最大值(CTmin和CTmax)之间没有、正或负的关系。本文采用系统发育校正分析方法,确定了澳大利亚东部沿海拔梯度分布的温带和热带溪流中121种淡水昆虫(Ephemeroptera、Plecoptera和Trichoptera)的CTmin、CTmax、热宽度(=CTmax-CTmin)、暖耐性(=CTmax-年平均栖息地温度)、暖容量(=CTmax-年最高栖息地温度)和生物大小之间的关系。当对所有站点(即两个海拔梯度)的数据进行整理时,CTmin和CTmax正相关,表明在多区域空间尺度上耐受高温和低温之间存在权衡。然而,在每个梯度内,这些指标不相关,表明在区域尺度上,耐高温性对耐低温性没有影响,反之亦然。除CTmax和体型外,所有对变量在三个数据集中的一个或多个中都是相关的(或正或负)。在43%的变量对中,温带和热带梯度的站点之间的关系不一致。关于变量对之间关系方向的假设在50%的对比中得到一致的支持。虽然所检查的变量大多是相互关联的,但空间尺度在确定这种关系的性质方面很重要。
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来源期刊
Journal of thermal biology
Journal of thermal biology 生物-动物学
CiteScore
5.30
自引率
7.40%
发文量
196
审稿时长
14.5 weeks
期刊介绍: The Journal of Thermal Biology publishes articles that advance our knowledge on the ways and mechanisms through which temperature affects man and animals. This includes studies of their responses to these effects and on the ecological consequences. Directly relevant to this theme are: • The mechanisms of thermal limitation, heat and cold injury, and the resistance of organisms to extremes of temperature • The mechanisms involved in acclimation, acclimatization and evolutionary adaptation to temperature • Mechanisms underlying the patterns of hibernation, torpor, dormancy, aestivation and diapause • Effects of temperature on reproduction and development, growth, ageing and life-span • Studies on modelling heat transfer between organisms and their environment • The contributions of temperature to effects of climate change on animal species and man • Studies of conservation biology and physiology related to temperature • Behavioural and physiological regulation of body temperature including its pathophysiology and fever • Medical applications of hypo- and hyperthermia Article types: • Original articles • Review articles
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