Geographic variation in larval cold tolerance and exposure across the invasion front of a widely established forest insect

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外文摘要：Under global climate change,high and low temperature extremes can drive shifts in species distributions.Across the range of a species,thermal tolerance is based on acclimatization,plasticity,and may undergo selection,shaping resilience to temperature stress.In this study,we measured variation in cold temperature tolerance of early instar lar-vae of an invasive forest insect,Lymantria dispar dispar L.(Lepidoptera:Erebidae),using populations sourced from a range of climates within the current introduced range in the Eastern United States.We tested for population differences in chill coma recovery(CCR)by measuring recovery time following a period of exposure to a nonlethal cold tempera-ture in 2 cold exposure experiments.A 3rd experiment quantified growth responses after CCR to evaluate sublethal effects.Our results indicate that cold tolerance is linked to re-gional climate,with individuals from populations sourced from colder climates recovering faster from chill coma.While this geographic gradient is seen in many species,detecting this pattern is notable for an introduced species founded from a single point-source in-troduction.We demonstrate that the cold temperatures used in our experiments occur in nature during cold spells after spring egg hatch,but impacts to growth and survival ap-pear low.We expect that population differences in cold temperature performance manifest more from differences in temperature-dependent growth than acute exposure.Evaluating intraspecific variation in cold tolerance increases our understanding of the role of climatic gradients on the physiology of an invasive species,and contributes to tools for predicting further expansion.

外文关键词：

chill coma recoveryforest insectgeographic gradientLymantria disparspring cold spellthermal performance

作者：

Petra Hafker、Lily M.Thompson、Jonathan A.Walter、Dylan Parry、Kristine L.Grayson

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作者单位：

Department of Biology,University of Richmond,Richmond,VA,USA

Department of Entomology,Cornell University,Ithaca,NY,USA

Department of Forestry and Environmental Conservation,Clemson University,Clemson,SC,USA

Department of Environmental Sci-ences,University of Virginia,Charlottesville,VA,USA

Department of Environmental Biology,State University of New York,College of Environmental Science and Forestry,Syracuse,NY,USA

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出版年：

2024

DOI：

10.1111/1744-7917.13358

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(6)