23 research outputs found

    Local recruitment great tit study

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    Local recruitment great tit stud

    Sex-specific effects of yolk androgen manipulation on growth and morphology in birds.

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    <p>Body mass: A: data from authors; D: data from Dunning (2008).</p><p>SDI: sexual dimorphism index.</p><p>Manipulated hormone: T: testosterone; A4: androstenedione.</p><p>Effects: + increased trait value; ++ strongly increased trait value;–reduced trait value;––strongly reduced trait value; = trait not affected.</p><p>Sex-specific effects of yolk androgen manipulation on growth and morphology in birds.</p

    Nestling data great tit study

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    Nestling data great tit stud

    Differences in sexual size dimorphism between species that show sex-specific responses to yolk androgens in the wild.

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    <p>F+: species in which the growth of females was more strongly boosted by high yolk androgen levels; = species in which males and females showed a similar response to increased yolk androgen levels; M+: species in which the growth of males was more strongly boosted by high yolk androgen levels. SDI: sexual dimorphism index (body mass larger sex / body mass smaller sex—1). SDI is arbitrarily made negative if the male is the larger sex and positive if the female is the larger sex [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0133673#pone.0133673.ref017" target="_blank">17</a>]. Means ± 1 SE of studies performed in the wild are presented. Note that differences in SDI between response groups are shown for illustrative purposes only. The statistical analyses were performed with response group as the dependent and SDI as the independent variable.</p

    Survival data great tit study

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    Survival data great tit stud

    Sex-specific effects of yolk androgens in great tits.

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    <p>Difference in A) fledging size and B) fledging mass of male and female great tit nestlings originating from an egg with experimentally increased yolk testosterone content (T) or a control egg (C). Means ± 1 SE of the residuals (+1) of an analysis that included nest ID, brood size and hatching date are shown. Size difference between C and T males: <i>P</i> = 0.021, size difference between C and T females: <i>P</i> = 0.477; mass difference between C and T males: <i>P</i> = 0.026, mass difference between C and T females: <i>P</i> = 0.136.</p

    Measurements of Japanese quail (Coturnix japonica) from an artificial selection experiment for relative egg size

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    Excel file with 4 sheets, containing data collected from replicated divergent artificial selection lines for relative egg size, created in a captive population of Japanese quail (Coturnix japonica) at the University of Zurich. The first sheet contains information about subsequent sheets. The second sheet contains data mean values for each generation, repeat and line combinations for all traits used in analysis. The third sheet contains data of dried egg components from the fourth generation of the selection lines. The fourth sheet contains data of laying intervals from the fourth generation of the selection lines
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