Multidimensional analysis of Drosophila wing variation in Evolution Canyon

Journal of genetics

Abraham B. Koral¹  Vincent Debat1²  Jean R. David²  Eviatar Nevo¹  David Soulet²  Raphael Cornette² 

[1] Institute of Evolution, University of Haifa, Haifa 31905, Israel$$;UMR5202 OSEB, Departement Systematique et Evolution, Museum National d’Histoire Naturelle. 45 Rue Buffon 75005 Paris, France$$

关键词: phenotypic plasticity;    environmental stress;    canalization;    developmental stability;    geometric morphometrics;    fluctuating asymmetry;    Drosophila wing.;   

DOI  :  

学科分类：生物科学（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Environmental stress has been suggested to be a major evolutionary force, both through inducing strong selection and because of its direct impact on developmental buffering processes that alter the evolvability of organisms. In particular, temperature has attracted much attention because of its importance as an ecological feature and the relative ease with which it can be experimentally manipulated in the lab. Evolution Canyon, Lower Nahal Oren, Israel, is a well studied natural site where ecological parameters are suspected to drive evolutionary differentiation. In this study, using Drosophila melanogaster isofemale lines derived from wild flies collected on both slopes of the canyon, we investigated the effect of developmental temperature upon the different components of phenotypic variation of a complex trait: the wing. Combining geometric and traditional morphometrics, we find only limited evidence for a differentiation among slopes. Investigating simultaneously phenotypic plasticity, genetic variation among isofemale lines, variation among individuals and fluctuating asymmetry, we could not identify a consistent effect of the stressful conditions encountered on the south facing slope. The prevailing structuring effect is that of the experimentally manipulated temperature which clearly influences wing mean size and shape. Variability, in contrast, is not consistently affected by temperature. Finally, we investigated the specific relationship between individual variation and fluctuating asymmetry. Using metric multi-dimensional scaling we show that the related patterns of wing shape variation are not identical, supporting the view that the underlying developmental processes are to a certain extent different.

【 授权许可】

Unknown