Frequency and Density-Dependent Selection on Life-History Strategies - A Field Experiment
Mappes, T., Koivula, M., Koskela, E., Oksanen, T., Savolainen, T. & Sinervo, B. (2008). Frequency and density-dependent selection on life-history strategies - a field experiment. PLoS ONE, 3 (2), e1687.
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PLoS ONETekijät
Päivämäärä
2008Tekijänoikeudet
© 2008 Mappes et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Negative frequency-dependence, which favors rare genotypes, promotes the maintenance of genetic variability and is of
interest as a potential explanation for genetic differentiation. Density-dependent selection may also promote cyclic changes
in frequencies of genotypes. Here we show evidence for both density-dependent and negative frequency-dependent
selection on opposite life-history tactics (low or high reproductive effort, RE) in the bank vole (Myodes glareolus). Densitydependent
selection was evident among the females with low RE, which were especially favored in low densities. Instead,
both negative frequency-dependent and density-dependent selection were shown in females with high RE, which were
most successful when they were rare in high densities. Furthermore, selection at the individual level affected the
frequencies of tactics at the population level, so that the frequency of the rare high RE tactic increased significantly at high
densities. We hypothesize that these two selection mechanisms (density- and negative frequency-dependent selection) may
promote genetic variability in cyclic mammal populations. Nevertheless, it remains to be determined whether the origin of
genetic variance in life-history traits is causally related to density variation (e.g. population cycles).
...
Julkaisija
Public Library of ScienceISSN Hae Julkaisufoorumista
1932-6203Asiasanat
frequency-dependent selection density dependent selection alternative life-history strategy reproductive costs intra-specific competition frekvenssistä riippuvat valinnat tiheydestä riippuvat valinnat vaihtoehtoinen elinkiertostrategia lisääntymispanostus lisääntymisen kustannukset lajin sisäinen kilpailu
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