Effects of experimental tail shortening on the phenotypic condition of barn 1
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Experimental tail shortening in Barn Swallows ( Hirundo rustica ) affects haematocrit
1. Recent studies in Scotland suggest that the outermost tail feathers of Barn Swallows ( Hirundo rustica Linnaeus) may be around 10–12 mm longer than the aerodynamic optimum, with sexual selection for long tails accounting for this extra length. 2. To test this hypothesis, we shortened the outermost tail feathers in male and female Barn Swallows in southern Spain by cutting 1, 11 or 21 mm from...
متن کاملThe function of long tails in female barn swallows {Hirundo rustica): an experimental study
The outermost tail feathers in male barn swallows {Hirundo rustica) are the target of a strong directional female mate preference. The" tait ornament is also expressed in females, since females have considerably longer tails than juveniles, either due to (1) a strong genetic correlation between the characters in the two sexes, or (2) direct sexual selection on females. To discriminate between t...
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Phenotypic plasticity is an important mechanism of phenotypic adaptation in response to environmental conditions. This study was conducted to investigate the effect of food type on the body shape of swordtail, Xiphoohurus helleri, during early development using geometric morphometric method. For this purpose, two treatments including feed by Artemia naupli and commercial Biomar diet were used i...
متن کاملExperimental tail elongation in male Barn Swallows Hirundo rustica reduces provisioning of young, but only in second broods
At the beginning of the breeding season, the outermost tail feathers of 31 male Barn Swallows Hirundo rustica were either shortened by 20 mm, elongated by 20 mm or left unmanipulated. In first broods, the number of feeding bouts (per nestling per hour) by males and females did not differ significantly among experimental groups. However, in second broods, males with elongated tails fed their nes...
متن کاملEffects of Hydroalcoholic Extract of Matricaria chamomilla on Serum Testosterone and Estradiol Levels, Spermatozoon Quality, and Tail Length in Rat
Background: Matricaria chamomilla (chamomile) is a herb used to treat various human illnesses. The present study was conducted to investigate the effects of chamomile extract on spermatozoon quality, serum levels of estradiol and testosterone, and sperm tail length in male adult rat. Methods: Male Sprague-Dawley rats received extract of chamomile (400 mg/kg once daily, orally) during an 8-week...
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تاریخ انتشار 2015