Low seasonal temperatures promote life cycle synchronization |
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Authors: | Janette L Jenkins James A Powell Jesse A Logan Barbara J Bentz |
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Institution: | (1) Department of Mathematics and Statistics, Utah State University, Logan, Utah 84322-3900, USA;(2) USDA Forest Service Forestry Sciences Lab, Utah State University, Logan, Utah 84322-8000, USA |
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Abstract: | In this paper we discuss how seasonal temperature variation and life-stage specific developmental thresholds that cause quiescence
can synchronize the seasonal development of exothermic organisms. Using a simple aging model it is shown that minimal seasonal
temperature variation and periods of quiescence during extreme temperature conditions are sufficient to establish stable,
univoltine ovipositional cycles. Quiescence induced by life-stage specific developmental thresholds, in fact, promotes synchronous
oviposition and emergence. The mountain pine beetle, an important insect living in extreme temperature conditions and showing
no evidence of diapause, invites direct application of this model. Simulations using mountain pine beetle parameters are used
to determine temperature regimes for which stable ovipositional cycles exist. |
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