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Developmental parameters of a southern mountain pine beetle (Coleoptera: Curculionidae) population reveal potential source of latitudinal differences in generation time

Published online by Cambridge University Press:  06 November 2018

Anne E. McManis ,
James A. Powell  and
Barbara J. Bentz
Anne E. McManis
Affiliation:
Department of Biology, Utah, State University, 5305 Old Main Hill, Logan, Utah, 84322, United States of America
James A. Powell
Affiliation:
Department of Biology, Utah, State University, 5305 Old Main Hill, Logan, Utah, 84322, United States of America Department of Mathematics and Statistics, Utah, State University, 3900 Old Main Hill, Logan, Utah, 84322, United States of America
Barbara J. Bentz*
Affiliation:
United States Department of Agriculture Forest Service, Rocky Mountain Research Station, 860 North 1200 East, Logan, Utah, 84321, United States of America
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Mountain pine beetle (Dendroctonus ponderosae Hopkins; Coleoptera: Curculionidae) is a major disturbance agent in pine (Pinus Linnaeus; Pinaceae) ecosystems of western North America. Adaptation to local climates has resulted in primarily univoltine generation time across a thermally diverse latitudinal gradient. We hypothesised that voltinism patterns have been shaped by selection for slower developmental rates in southern populations inhabiting warmer climates. To investigate traits responsible for latitudinal differences we measured lifestage-specific development of southern mountain pine beetle eggs, larvae, and pupae across a range of temperatures. Developmental rate curves were fit using maximum posterior likelihood estimation with a Bayesian prior to improve fit stability. When compared to previously published data for a northern population, optimal development of southern individuals occurred at higher temperatures, with higher development thresholds, as compared with northern individuals. Observed developmental rates of the southern and northern populations were similar across studied lifestages at 20 °C, and southern lifestages were generally faster at temperature extremes (10 °C, 27 °C). At 25 °C southern fourth instars were significantly slower than northern fourth instars. Our results suggest that evolved traits in the fourth instar and remaining unstudied lifestage, teneral (i.e., preemergent) adult, likely influence latitudinal differences in mountain pine beetle generation time.

Type
Physiology, Biochemistry, Development, & Genetics
Information
The Canadian Entomologist , Volume 151 , Issue 1 , February 2019 , pp. 1 - 15
Copyright
© 2018 Entomological Society of Canada. Parts of this are a work of the U.S.Government and are not subject to copyright protection in the United States 

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Footnotes

Subject editor: Therese Poland

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