Evol Ecol Res 11: 1271-1281 (2009) Full PDF if your library subscribes.
Heritability of defence and life-history traits in the two-spotted spider mite
N.S.H. Tien, M.W. Sabelis and M. Egas
Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
Correspondence: N.S.H. Tien, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, PO Box 94084, 1090 GB Amsterdam, Netherlands.
Background: Two-spotted spider mites hide against predatory mites in a web of self-produced sticky silk. The proteins invested in this shelter may reduce investment in reproduction.
Questions: Do spider mite populations harbour genetic variation for web production, thereby enabling a response to selection by predation? Is adaptation affected by genetic trade-offs with life-history traits? The data were also used to test a central hypothesis in quantitative genetics, that heritability indicates a trait’s importance for fitness and is positively correlated with the amount of additive genetic variation across traits.
Method: Using a mother–daughter breeding design, we determined the narrow-sense heritability and coefficients of additive genetic and residual variation (CVA and CVR) for web production and six life-history traits. In addition, we examined correlations between heritable traits for genetic trade-offs.
Conclusions: Web production exhibited heritability of 50% and a high CVA. Thus, web production is not a fixed defence-related trait, and probably has the potential to evolve. Two life-history traits (oviposition rate and total adult offspring) revealed significant heritable variation. Results were inconclusive regarding genetic trade-off with web production. The life-history data demonstrate a positive relationship between heritability and CVA, which supports the hypothesis that the relationship of traits with fitness influences their amount of heritable variation.
Keywords: elimination-selection hypothesis, Tetranychus urticae, trade-off, variance compounding.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2009 N.S.H. Tien. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.