Briseïs Castella and Joaquim Golay contributed equally to this work.
Melanism, body condition and elevational distribution in the asp viper
Article first published online: 8 APR 2013
© 2013 The Zoological Society of London
Journal of Zoology
Volume 290, Issue 4, pages 273–280, August 2013
How to Cite
Castella, B., Golay, J., Monney, J.-C., Golay, P., Mebert, K. and Dubey, S. (2013), Melanism, body condition and elevational distribution in the asp viper. Journal of Zoology, 290: 273–280. doi: 10.1111/jzo.12037
We dedicate this paper to our highly esteemed co-author Jean-Claude Monney who passed away in December 2012. For this reason, we express our deep thanks for his collaboration on the ecology and evolution of the asp viper that began many years ago. We will never forget him.
Editor: Mark-Oliver Rödel
- Issue published online: 16 JUL 2013
- Article first published online: 8 APR 2013
- Manuscript Accepted: 4 MAR 2013
- Manuscript Revised: 3 MAR 2013
- Manuscript Received: 22 JAN 2013
- Swiss National Science Foundation (SNSF)
- montane species;
Alternative morphotypes can confer important selective advantages in different habitats, whereas they can be penalized in other circumstances. In ectotherms, such as reptiles, the body colour can have direct effects on numerous aspects of their existence, such as thermoregulation or prey–predator interactions. Darker melanic individuals show lower skin reflectance and consequently heat up more rapidly and maintain optimal body temperatures more easily than lighter coloured individuals. As a consequence, melanistic individuals of diurnal species in cool areas may exhibit higher body condition, growth rate, survival and fecundity than lighter coloured individuals. Such advantages of dark coloration may be counterbalanced by a lower crypsis to predators and a decreased foraging efficiency. We investigated, in two montane populations of asp vipers Vipera aspis, the relationship between (1) colour polymorphism and body condition and length and (2) the coloration of individuals and their elevational distribution. We showed significant relationships between (1) the coloration, body condition and sex of individuals; (2) sexes and reproductive state and morph frequency; and (3) colour morphs that were distributed following an elevational gradient. Hence, colour polymorphism plays an important role in the ecology and evolution of the asp viper and is maintained through differential selective pressures.