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Sökning: L773:0169 5347

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  • Chapman, T, et al. (författare)
  • Sexual conflict
  • 2003
  • Ingår i: Trends in Ecology & Evolution. - 0169-5347 .- 1872-8383. ; 18, s. 41-47
  • Tidskriftsartikel (refereegranskat)
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5.
  • GIBSON, RM, et al. (författare)
  • COPYING AND SEXUAL SELECTION
  • 1992
  • Ingår i: Trends in Ecology & Evolution. - 0169-5347 .- 1872-8383. ; 7:7, s. 229-232
  • Tidskriftsartikel (refereegranskat)
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6.
  • Hoffmann, AA, et al. (författare)
  • Heritable variation and evolution under favourable and unfavourable conditions
  • 1999
  • Ingår i: Trends in Ecology & Evolution. - 0169-5347 .- 1872-8383. ; 14:3, s. 96-101
  • Recension (refereegranskat)abstract
    • Genetic variability in quantitative traits can change as a direct response to the environmental conditions in which they are expressed. Consequently, similar selection in different environments might not be equally effective in leading to adaptation. Several hypotheses, including recent ones that focus on the historical impact of selection on populations, predict that the expression of genetic variation will increase in unfavourable conditions. However, other hypotheses lead to the opposite prediction. Although a consensus is unlikely, recent Drosophila and bird studies suggest consistent trends for morphological traits under particular conditions.
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  • Sih, Andrew, et al. (författare)
  • New insights on how temporal variation in predation risk shapes prey behavior
  • 2000
  • Ingår i: Trends in Ecology and Evolution. - 0169-5347. ; 15, s. 3-4
  • Tidskriftsartikel (refereegranskat)abstract
    • The fact that predators come and go, so that individual prey experience temporal variations in predation risk, is an almost unavoidable aspect of nature. Predation risk routinely varies seasonally1, across lunar cycles2 and diurnal cycles3, or on a moment-to-moment basis4. In spite of its near ubiquity in nature, until recently no theory has focused explicitly on the effects of temporal variation in risk on prey behavior. That is, existing theory has generally taken a static view – contrasting antipredator effort for prey facing constant high versus constant low predation risk. Now, however, a new model by Steven Lima and Peter Bednekoff5 has extended the ‘Risk Spreading Theorem’6, to show that the pattern of temporal variation in predation risk experienced by individual prey can be crucial for understanding patterns of antipredator effort. Their model has produced insights that are important for empiricists because, to date, experiments have not addressed these temporal effects, and because, perhaps more importantly, the model suggests that standard laboratory protocols might err systematically in estimating the importance of predation risk in nature.
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10.
  • Vincent, Amanda, et al. (författare)
  • Pipefishes and seahorses : are they all sex-role reversed?
  • 1992
  • Ingår i: Trends in Ecology & Evolution. - 0169-5347 .- 1872-8383. ; 7:7, s. 237-241
  • Tidskriftsartikel (refereegranskat)abstract
    • The male pregnancy of pipefishes and seahorses has led to the inference that females compete most intensely for access to mates, because males limit female reproduction. However, recent work has shown that in different species either sex may be the predominant competitor for mates. In this family, there is an apparent association between the mating pattern and the sex roles: polygamous species show reversed sex roles whereas monogamous species exhibit 'conventional' sex roles. These studies emphasize that sex role reversal is not synonymous with male parental care.
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