Evidence of maternal effects on temperature preference in side-blotched lizards: implications for evolutionary response to climate change
Article first published online: 23 MAY 2013
© 2013 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
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Ecology and Evolution
Volume 3, Issue 7, pages 1977–1991, July 2013
How to Cite
Ecology and Evolution 2013; 3(7): 1977–1991
- Issue published online: 10 JUL 2013
- Article first published online: 23 MAY 2013
- Manuscript Accepted: 26 APR 2013
- Manuscript Revised: 19 APR 2013
- Manuscript Received: 31 JAN 2013
- NSF. Grant Number: IOS-1022031
- University of California Santa Cruz
- Maternal effects;
- side-blotched lizards;
- temperature preference;
- throat color polymorphism
Natural populations respond to selection pressures like increasing local temperatures in many ways, including plasticity and adaptation. To predict the response of ectotherms like lizards to local temperature increase, it is essential to estimate phenotypic variation in and determine the heritability of temperature-related traits like average field body temperature (Tb) and preferred temperature (Tp). We measured Tp of Uta stansburiana in a laboratory thermal gradient and assessed the contribution of sex, reproductive status and throat color genotype to phenotypic variation in Tb of adult lizards. Females had higher Tp than males. However, they temporarily preferred lower temperature when gravid than when nongravid. Using a nested half-sib design for genetic crosses in the laboratory, we estimated relative contributions of additive genetic variation and maternal effects to Tp of hatchlings. Our results show that maternal effects, but not additive genetic variation, influence Tp of hatchlings in U. stansburiana. Maternal Tp and the presence or absence of blue throat color alleles significantly influenced Tp of hatchlings. We discuss ecological and evolutionary consequences of these maternal effects in the context of rapid climate change and natural selection that we measure on progeny survival to maturity as a function of maternal Tp.