Climate‐related variation of metabolic rate across the distribution of a broadly tolerant invasive forest pest

Author:

Powers Sean D.1ORCID,Thompson Lily M.23ORCID,Parry Dylan4ORCID,Grayson Kristine L.3ORCID,Martinez Eloy5ORCID,Agosta Salvatore J.6ORCID

Affiliation:

1. Integrative Life Sciences Doctoral Program Virginia Commonwealth University Richmond Virginia USA

2. Department of Forestry and Environmental Conservation Clemson University Clemson South Carolina USA

3. Department of Biology University of Richmond Richmond Virginia USA

4. Department of Environmental Biology SUNY College of Environmental Science and Forestry Syracuse New York USA

5. Department of Biological Sciences Nova Southeastern University Fort Lauderdale Florida USA

6. Center for Environmental Studies Virginia Commonwealth University Richmond Virginia USA

Abstract

AbstractAimMetabolic rate is a widely studied physiological species trait related to energetics, climate, and geographical distributions. Hypotheses have been proposed to explain variation in metabolic rate, but evidence has been mixed due to the limited sampling scope of intraspecific studies. Successful biological invasions offer a unique opportunity to examine the development of intraspecific physiological variation and how it relates to climate, invasive spread and species range limits. The aim of this study was to determine if metabolic rate variation across the spongy moth invasive range was consistent with a pattern of adaptation to local climate.LocationNortheastern United States of America.TaxonLymantria dispar dispar L. (Lepidoptera: Erebidae).MethodsLarvae were sourced from 14 populations across the invasion front and interior of the current L. d. dispar invasive range and were reared at a constant temperature. Routine metabolic rates (RMR) of larvae were assayed at three ecologically relevant temperatures. These data were analysed to determine if there were differences in RMR and temperature sensitivity of RMR among populations. Population‐level variation in RMR was then analysed as a function of local climate and geographical position to test for patterns consistent with local adaptation.ResultsLarval RMR showed significant variation among populations across all assay temperatures, but there was no difference in temperature sensitivity (i.e. slope). This variation followed a positive latitudinal cline with RMR increasing from the southern range to the north. This cline also showed a significant relationship with local climate variables.Main ConclusionsLarval metabolic rate variation was consistent with a pattern of adaptation by L. d. dispar to divergent climates across its invasive range. These results indicated that thermal adaptation of whole‐organism physiology may play a key role in promoting species spread and expansion for biological invasions like L. d. dispar.

Funder

National Science Foundation

School of Arts and Sciences, University of Richmond

Publisher

Wiley

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