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Published on: October 1, 2011
Development time and body size in Eupolyphaga sinensis along a latitudinal gradient from China
Yuwei Hu1, Fen Zhu, Xiaoping Wang
1Hubei Insect Resources Utilization and Sustainable Pest Management Key laboratory, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China.
Environmental Entomology
|December 21, 2011
Summary
Organisms adapt to temperature changes through phenotypic plasticity or evolutionary adaptation. This study shows temperature significantly impacts cockroach development, body size, and survival, with genetic differences influencing these traits across populations.
Area of Science:
- Ecology
- Evolutionary Biology
- Zoology
Background:
- Organisms respond to temperature variations via phenotypic plasticity or evolutionary adaptation.
- These responses can manifest as changes in body size or thermal reaction norms.
Purpose of the Study:
- To investigate the effects of different temperatures on development time, adult body size, and preadult survivorship in three populations of Eupolyphaga sinensis.
- To determine the extent of temperature-induced plasticity and genetic variation in thermal reaction norms among these populations.
Main Methods:
- Exposed three Eupolyphaga sinensis populations from different latitudes to four temperatures (22, 25, 28, and 31 °C).
- Measured development time, adult body size, and preadult survivorship.
Main Results:
- Substantial temperature-induced plasticity was observed in development time, body size, and preadult survivorship.
- Significant genetic differences among populations were found in these traits and their responses to temperature.
- Two populations supported the beneficial acclimation hypothesis, while one did not, likely due to differences in season length and voltinism.
Conclusions:
- Developmental temperatures significantly impact E. sinensis growth and life history traits.
- Genetic variation exists in thermal reaction norms among E. sinensis populations.
- Adaptations in development time, body size, and survivorship are crucial for E. sinensis in changing thermal regimes.
