Present address: Department of Biology, Syracuse University, Syracuse, NY 13244, USA.
Phenotypic plasticity, heterochrony and ontogenetic repatterning during juvenile development of divergent Arctic charr (Salvelinus alpinus)
Article first published online: 23 MAY 2011
© 2011 The Authors. Journal of Evolutionary Biology © 2011 European Society For Evolutionary Biology
Journal of Evolutionary Biology
Volume 24, Issue 8, pages 1640–1652, August 2011
How to Cite
PARSONS, K. J., SHEETS, H. D., SKÚLASON, S. and FERGUSON, M. M. (2011), Phenotypic plasticity, heterochrony and ontogenetic repatterning during juvenile development of divergent Arctic charr (Salvelinus alpinus). Journal of Evolutionary Biology, 24: 1640–1652. doi: 10.1111/j.1420-9101.2011.02301.x
- Issue published online: 13 JUL 2011
- Article first published online: 23 MAY 2011
- Received 24 September 2010; revised 8 April 2011; accepted 19 April 2011
- adaptive divergence;
- resource polymorphism
Phenotypic plasticity is a developmental process that plays a role as a source of variation for evolution. Models of adaptive divergence make the prediction that increasing ecological specialization should be associated with lower levels of plasticity. We tested for differences in the magnitude, rate and trajectory of morphological plasticity in two lake populations of Arctic charr (Salvelinus alpinus) that exhibited variation in the degree of resource polymorphism. We reared offspring on diet treatments that mimicked benthic and pelagic prey. Offspring from the more divergent population had lower levels of morphological plasticity. Allometry influenced the rate of shape change over ontogeny, with differences in rate among ecomorphs being minimal when allometric variation was removed. However, plasticity in the spatial trajectory of development was extensive across ecomorphs, both with and without the inclusion of allometric variation, suggesting that different aspects of shape development can evolve independently.