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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-5741

Vorburger, C; Ramsauer, N (2008). Genetic variation and covariation of aphid life-history traits across unrelated host plants. Bulletin of Entomological Research, 98(6):543-553.

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Abstract

A central paradigm of life-history theory is the existence of resource mediated trade-offs among different traits that contribute to fitness, yet observations inconsistent with this tenet are not uncommon. We previously found a clonal population of the aphid Myzus persicae to exhibit positive genetic correlations among major components of fitness, resulting in strong heritable fitness differences
on a common host. This raises the question of how this genetic variation is maintained. One hypothesis states that variation for resource acquisition on
different hosts may override variation for allocation, predicting strong fitness differences within hosts as a rule, but changes in fitness hierarchies across hosts
due to trade-offs. Therefore, we carried out a life-table experiment with 17 clones of M. persicae, reared on three unrelated host plants: radish, common lambsquarters and black nightshade. We estimated the broad-sense heritabilities of six lifehistory traits on each host, the genetic correlations among traits within hosts, and
the genetic correlations among traits on different hosts (cross-environment genetic correlations). The three plants represented radically different environments with strong effects on performance of M. persicae, yet we detected little evidence for
trade-offs. Fitness components were positively correlated within hosts but also between the two more benign hosts (radish and lambsquarters), as well as between those and another host tested earlier. The comparison with the most stressful host,
nightshade, was hampered by low survival. Survival on nightshade also exhibited genetic variation but was unrelated to fitness on other hosts. Acknowledging that the number of environments was necessarily limited in a quantitative genetic
experiment, we suggest that the rather consistent fitness hierarchies across very different plants provided little evidence to support the idea that the clonal variation for life-history traits and their covariance structure are maintained by strong genotyperenvironment interactions with respect to hosts. Alternative explanations are discussed.

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5 citations in Web of Science®
5 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
DDC:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:cost of acquisition, genetic correlations, host specialization, life-history evolution, Myzus persicae, trade-offs
Language:English
Date:2008
Deposited On:01 Dec 2008 11:31
Last Modified:27 Nov 2013 18:30
Publisher:Cambridge University Press
ISSN:0007-4853
Publisher DOI:10.1017/S0007485308005853

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