首页 | 本学科首页   官方微博 | 高级检索  
     


The devil in the details of life-history evolution: Instability and reversal of genetic correlations during selection onDrosophila development
Authors:Adam?K.?Chippindale  author-information"  >  author-information__contact u-icon-before"  >  mailto:chippind@biology.queensu.ca"   title="  chippind@biology.queensu.ca"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author,Anh?L.?Ngo,Michael?R.?Rose
Affiliation:(1) Department of Biology, Queen’s University, ON K7L 3N6 Kingston, Canada;(2) Department of Ecology and Evolutionary Biology, University of California, 92697-2525 Irvine, CA, USA
Abstract:The evolutionary relationships between three major components of Darwinian fitness, development rate, growth rate and preadult survival, were estimated using a comparison of 55 distinct populations ofDrosophila melanogaster variously selected for age-specific fertility, environmental-stress tolerance and accelerated development. Development rate displayed a strong net negative evolutionary correlation with weight at eclosion across all selection treatments, consistent with the existence of a size-versus-time tradeoff between these characters. However, within the data set, the magnitude of the evolutionary correlation depended upon the particular selection treatments contrasted. A previously proposed tradeoff between preadult viability and growth rate was apparent only under weak selection for juvenile fitness components. Direct selection for rapid development led to sharp reductions in both growth rates and viability. These data add to the mounting results from experimental evolution that illustrate the sensitivity of evolutionary correlations to (i) genotype-by-environment (G X E) interaction, (ii) complex functional-trait interactions, and (iii) character definition. Instability, disappearance and reversal of patterns of genetic covariation often occur over short evolutionary time frames and as the direct product of selection, rather than some stochastic process. We suggest that the functional architecture of fitness is a rapidly evolving matrix with reticulate properties, a matrix that we understand only poorly.
Keywords:evolution  life history genetic correlation  experimental evolution  growth rate   Drosophila melanogaster
本文献已被 PubMed SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号