Browsing by Subject "POECILIA-RETICULATA"

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  • Kotrschal, Alexander; Lievens, Eva J. P.; Dahlbom, Josefin; Bundsen, Andreas; Semenova, Svetlana; Sundvik, Maria; Maklakov, Alexei A.; Winberg, Svante; Panula, Pertti; Kolm, Niclas (2014)
  • van Bergen, Erik; Lafuente, Elvira (2018)
    ABSTRACT Is the evolution of sexual traits predictable in the wild? Using replicate experimental guppy populations, Kemp et al. (2018) addressed this question and found that males evolved more elaborate ornamentation in response to a manipulation that increased the influence of sexual selection. Moreover, the study reveals that evolutionary trajectories of male ornamentation are causally affected by female preference and the environmental conditions under which sexual coloration is displayed and perceived. This article is protected by copyright. All rights reserved
  • Tringali, Angela; Bowman, Reed; Husby, Arild (2015)
    Sexually dimorphic plumage coloration is widespread in birds and is generally thought to be a result of sexual selection for more ornamented males. Although many studies find an association between coloration and fitness related traits, few of these simultaneously examine selection and inheritance. Theory predicts that sex-linked genetic variation can facilitate the evolution of dimorphism, and some empirical work supports this, but we still know very little about the extent of sex linkage of sexually dimorphic traits. We used a longitudinal study on juvenile Florida scrub-jays (Aphelocoma coerulescens) to estimate strength of selection and autosomal and Z-linked heritability of mean brightness, UV chroma, and hue. Although plumage coloration signals dominance in juveniles, there was no indication that plumage coloration was related to whether or not an individual bred or its lifetime reproductive success. While mean brightness and UV chroma are moderately heritable, hue is not. There was no evidence for sex-linked inheritance of any trait with most of the variation explained by maternal effects. The genetic correlation between the sexes was high and not significantly different from unity. These results indicate that evolution of sexual dimorphism in this species is constrained by low sex-linked heritability and high intersexual genetic correlation.