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Träfflista för sökning "WFRF:(Mobley Kenyon B.) srt2:(2013)"

Sökning: WFRF:(Mobley Kenyon B.) > (2013)

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1.
  • Aronsen, Tonje, et al. (författare)
  • Sex Ratio And Density Affect Sexual Selection In A Sex-Role Reversed Fish
  • 2013
  • Ingår i: Evolution. - : Wiley. - 0014-3820 .- 1558-5646. ; 67:11, s. 3243-3257
  • Tidskriftsartikel (refereegranskat)abstract
    • Understanding how demographic processes influence mating systems is important to decode ecological influences on sexual selection in nature. We manipulated sex ratio and density in experimental populations of the sex-role reversed pipefish Syngnathus typhle. We quantified sexual selection using the Bateman gradient (beta'ss), the opportunity for selection (I), and sexual selection (Is), and the maximum standardized sexual selection differential (s(max)). We also measured selection on body length using standardized selection differentials (s') and mating differentials (m'), and tested whether the observed I and Is differ from values obtained by simulating random mating. We found that I, Is, and s'(max), but not beta'(ss), were higher for females under female than male bias and the opposite for males, but density did not affect these measures. However, higher density decreased sexual selection (m similar to but not s') on female length, but selection on body length was not affected by sex ratio. Finally, Is but not I was higher than expected from random mating, and only for females under female bias. This study demonstrates that both sex ratio and density affect sexual selection and that disentangling interrelated demographic processes is essential to a more complete understanding of mating behavior and the evolution of mating systems.
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2.
  • Mobley, Kenyon B., et al. (författare)
  • No evidence that stickleback spines directly increase risk of predation by an invertebrate predator
  • 2013
  • Ingår i: Evolutionary Ecology Research. - 1522-0613 .- 1937-3791. ; 15:2, s. 189-198
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Some populations of stickleback have a reduced number and/or relative size of spines. Hypothesis: Macroinvertebrate predators such as dragonfly larvae cause selective pressure against spines by capturing more stickleback with pelvic spines than stickleback that are spineless. Organisms: Ninespine stickleback (Pungitius pungitius) and dragonfly larvae (Aeshna grandis). Methods: We used 10 stickleback, five with pelvic spines and five with their pelvic spines removed. We put them in containers with two dragonfly larvae. Every day for 4 days we monitored how many stickleback were captured by the larvae. We repeated this experiment ten times at two different densities of fish and predators. We also developed a model to determine whether selection for spinelessness can be distinguished from drift. Results: Dragonfly larvae caught as many stickleback with spines as without. The absence of spines was not associated with a decrease in predation risk. We substituted Bayesian estimates of the selection coefficient into quantitative genetic models of allele frequency change, and the results of the models suggest that the selective advantage of spine loss is so small that its effects cannot be distinguished from drift.
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