Artificial selection for increased dispersal results in lower fitness

Zwoinska, Martyna K, Larva, Tuuli, Sekajova, Zuzana, Carlsson, Hanne, Meurling, Sara and Maklakov, Alexei A ORCID: (2020) Artificial selection for increased dispersal results in lower fitness. Journal of Evolutionary Biology, 33 (2). pp. 217-224. ISSN 1010-061X

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Dispersal often covaries with other traits, and this covariation was shown to have a genetic basis. Here, we wanted to explore to what extent genetic constraints and correlational selection can explain patterns of covariation between dispersal and key life-history traits-lifespan and reproduction. A prediction from the fitness-associated dispersal hypothesis was that lower genetic quality is associated with higher dispersal propensity as driven by the benefits of genetic mixing. We wanted to contrast it with a prediction from a different model that individuals putting more emphasis on current rather than future reproduction disperse more, as they are expected to be more risk-prone and exploratory. However, if dispersal has inherent costs, this will also result in a negative genetic correlation between higher rates of dispersal and some aspects of performance. To explore this issue, we used the dioecious nematode Caenorhabditis remanei and selected for increased and decreased dispersal propensity for 10 generations, followed by five generations of relaxed selection. Dispersal propensity responded to selection, and females from high-dispersal lines dispersed more than females from low-dispersal lines. Females selected for increased dispersal propensity produced fewer offspring and were more likely to die from matricide, which is associated with a low physiological condition in Caenorhabditis nematodes. There was no evidence for differences in age-specific reproductive effort between high- and low-dispersal females. Rather, reproductive output of high-dispersal females was consistently reduced. We argue that our data provide support for the fitness-associated dispersal hypothesis.

Item Type: Article
Additional Information: © 2019 European Society For Evolutionary Biology. Journal of Evolutionary Biology © 2019 European Society For Evolutionary Biology.
Uncontrolled Keywords: behavior,consequences,caenorhabditis,epiphyas-postvittana,evolution,lifetime fitness,natal dispersal,nematode,population,quantitative genetic-analysis,trade-offs,artificial selection,dispersal syndromes,fitness-associated dispersal,life-history theory
Faculty \ School: Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Organisms and the Environment
Faculty of Medicine and Health Sciences > Research Centres > Norwich Institute for Healthy Aging
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Depositing User: LivePure Connector
Date Deposited: 21 Jan 2020 03:16
Last Modified: 14 May 2023 00:15
DOI: 10.1111/jeb.13563

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