Role of climatic variability in shaping intraspecific variation of thermal tolerance in Mediterranean water beetles

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外文摘要：The climatic variability hypothesis(CVH)predicts that organisms in more thermally variable environments have wider thermal breadths and higher thermal plastic-ity than those from more stable environments.However,due to evolutionary trade-offs,taxa with greater absolute thermal limits may have little plasticity of such limits(trade-off hypothesis).The CVH assumes that climatic variability is the ultimate driver of thermal tolerance variation across latitudinal and altitudinal gradients,but average temperature also varies along such gradients.We explored intraspecific variation of thermal tolerance in three typical Mediterranean saline water beetles(families Hydrophilidae and Dytisci-dae).For each species,we compared two populations where the species coexist,with sim-ilar annual mean temperature but contrasting thermal variability(continental vs.coastal population).We estimated thermal limits of adults from each population,previously ac-climated at 17,20,or 25 ℃.We found species-specific patterns but overall,our results agree with the CVH regarding thermal ranges,which were wider in the continental(more variable)population.In the two hydrophilid species,this came at the cost of losing plas-ticity of the upper thermal limit in this population,supporting the trade-off hypothesis,but not in the dytiscid one.Our results support the role of local adaptation to thermal variability and trade-offs between basal tolerance and physiological plasticity in shaping thermal tolerance in aquatic ectotherms,but also suggest that intraspecific variation of thermal tolerance does not fit a general pattern among aquatic insects.Overlooking such intraspecific variation could lead to inaccurate predictions of the vulnerability of aquatic insects to global warming.

外文关键词：

acclimation capacityaquatic insectsclimate changeheat coma tempera-turesupercooling pointthermal plasticity

作者：

Susana Pallarés、David Garoffolo、Belén Rodríguez、David Sánchez-Fernández

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作者单位：

Department of Zoology,University of Seville,Seville,Spain

Faculty of Biology,Department of Ecology and Hydrology,University of Murcia,Campus Espinardo,Murcia,Spain

基金：

the"Consejería de Economía,Conocimiento,Empresas y Universidad de la Junta de Andalucía-Fondo Social Europeo de Andalucía 2014-2the"Ministerio de Ciencia e Innovación"from Spain"Ramón y Cajal"program

项目编号：

SP-DOC_01211RYC2019-027446-I

出版年：

2024

DOI：

10.1111/1744-7917.13241

中国昆虫科学(英文版)

中国昆虫学会中科院动物所

中国昆虫科学(英文版)

CSTPCD

影响因子：0.484

ISSN：1672-9609

年,卷(期)：2024.31(1)

参考文献量91