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Oecologia

, Volume 146, Issue 4, pp 541–548 | Cite as

How caterpillars avoid overheating: behavioral and phenotypic plasticity of pipevine swallowtail larvae

  • Chris C. Nice
  • James A. Fordyce
Population Ecology

Abstract

We tested the hypothesis that larvae of the pipevine swallowtail butterfly, Battus philenor, employ behavioral and phenotypic plasticity as thermoregulatory strategies. These larvae are phenotypically varied across their range with predominantly black larvae (southeastern USA and California) and red larvae (western Texas, Arizona) occurring in different regions. Two years of field observations in south Texas indicate that the proportion of red larvae increases with increasing daily temperatures as the growing season progresses. Larvae were also observed to shift their microhabitats by climbing on non-host vegetation and avoided excessive heat in their feeding microhabitat. Larvae of ten half-sib families from populations in south Texas and California, reared under different temperature regimes in common garden experiments, exhibited plasticity in larval phenotype, with larvae from both populations producing the red phenotype at temperatures greater than 30°C and maintaining the black phenotype at cooler temperatures. However, larvae from Texas were more tolerant of higher temperatures, showing no decrease in growth rate in the highest temperature (maximum seasonal temperature) treatment, compared to the California population. In a field experiment, black larvae were found to have higher body temperatures when exposed to sunlight compared to red larvae. These results suggest that microhabitat shifts and the color polyphenism observed in pipevine swallowtail larvae may be the adaptive strategies that enable larvae to avoid critical thermal maximum temperatures.

Keywords

Battus philenor Larval color Microhabitat shifts Polyphenism Thermoregulation 

Notes

Acknowledgements

We thank A. M. Shapiro, M. L. Forister, M. Beals and two anonymous reviewers for helpful discussion and comments. We thank M. Spencer for assistance in the field and J. P. Bach, manager of Freeman Ranch, Texas State University, for logistical support. This work was funded by The Center for Population Biology (University of California, Davis), the University of Tennessee (Knoxville) and by a Texas State University Research Enhancement Grant to C. Nice.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Biology, Population and Conservation Biology ProgramTexas State UniversitySan MarcosUSA
  2. 2.Department of Ecology and Evolutionary BiologyUniversity of TennesseeKnoxvilleUSA

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