The Significance and Thermodynamics of Fluctuating Versus Static Thermal Environments on
Heliothis zea
Egg Development Rates
1

Eubank, W. P.; Atmar, J. W.; Ellington, Joe

doi:10.1093/ee/2.4.491

Cited by 31 publications

(17 citation statements)

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“…At 30ЊC, the two influences initially balance out, and overall developmental rate and incubation period are unaffected until the fluctuations become sufficiently extreme for high-temperature inhibition to dominate. These varied potential outcomes cover the range of observed outcomes in the literature and may explain the apparently conflicting results identified by Eubank et al (1973).…”

Section: Discussionmentioning

confidence: 97%

“…The literature contains conflicting reports on the effects of fluctuating temperatures on insect development (Eubank et al 1973). Some studies have shown that insect developmental times decrease under fluctuating temperatures compared with constant temperature regimes with the same mean, and others have shown them to increase, while others have found no effect of temperature fluctuations at all (Hagstrum and Hagstrum 1970;Morris and Fulton 1970;Hagstrum and Milliken 1991).…”

Section: Discussionmentioning

confidence: 99%

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Modelling Development of Reptile Embryos under Fluctuating Temperature Regimes

Georges

Beggs

Young

et al. 2005

Physiological and Biochemical Zoology

146

192

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An increase in temperature, within bounds, will accelerate development of reptile embryos, and morphogenesis can be normal over a range of temperatures despite those varying rates of development. Less well understood is the form of the relationship that best describes variation in developmental rate with temperature. In this article, we apply a linear degree.hour model, an empirical curvilinear model, a biophysical model, and a polynomial model to data on rates of embryonic development and temperature in the pig-nosed turtle Carettochelys insculpta from northern Australia. The curvilinear models, which have been applied with success to development of insects, describe the embryonic development of turtles well. When fluctuating temperatures extend beyond the constant temperatures that support successful incubation, the curvilinear models continue to perform well, whereas the linear model predictions fail. Sensitivity analysis indicates that under some circumstances, incubation duration may be increased by diel temperature fluctuations, independent of an influence of mean temperature. In other circumstances, incubation duration may be decreased, and in still other circumstances, diel temperature fluctuations will have no impact on incubation duration. This adds an additional dimension to our understanding of how thermal regimes can be selected or manipulated by reptiles to optimise incubation duration and the timing of offspring emergence.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Modelling Development of Reptile Embryos under Fluctuating Temperature Regimes

Georges

Beggs

Young

et al. 2005

Physiological and Biochemical Zoology

146

192

View full text Add to dashboard Cite

show abstract

“…The body temperature of poikilotherms is not internally regulated; instead, their body temperature, and consequently their metabolic rate depend on ambient temperature, causing them to develop at different rates at different temperatures (Sharpe and DeMichele, 1977;Eubank et al, 1973). At low to moderate temperatures increasing temperature speeds metabolism resulting in a shorter time period required for development.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Evolution of Insect Phenology

Yurk

Powell

2008

Bull. Math. Biol.

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Climate change is likely to disrupt the timing of developmental events (phenology) in insect populations in which development time is largely determined by temperature. Shifting phenology puts insects at risk of being exposed to seasonal weather extremes during sensitive life stages and losing synchrony with biotic resources. Additionally, warming may result in loss of developmental synchronization within a population making it difficult to find mates or mount mass attacks against well-defended resources at low population densities. It is unknown whether genetic evolution of development time can occur rapidly enough to moderate these effects. We present a novel approach to modeling the evolution of phenology by allowing the parameters of a phenology model to evolve in response to selection on emergence time and density. We use the Laplace method to find asymptotic approximations for the temporal variation in mean phenotype and phenotypic variance arising in the evolution model that are used to characterize invariant distributions of the model under periodic temperatures at leading order. At these steady distributions the mean phenotype allows for parents and offspring to be oviposited at the same time of year in consecutive years. Numerical simulations show that populations evolve to these steady distributions under periodic temperatures. We consider an example of how the evolution model predicts populations will evolve in response to warming temperatures and shifting resource phenology.

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“…Obtaining such detailed knowledge has long been a focus of study in entomology (Wagner et al 1984;Liu et al 1995), although there are conflicting reports on the effects of fluctuating temperatures on insect development (Eubank et al 1973). Similar conflicting results are available in the more limited literature on reptile development under fluctuating regimes.…”

Section: Thermal Models Of Tsd Under Laboratory and Field Conditionsmentioning

confidence: 99%