Haematocrit is weakly related to condition in nestling Barn Swallows Hirundo rustica
نویسندگان
چکیده
JOSÉ J. CUERVO, 1 * ANDERS P. MØLLER 2 & FLORENTINO DE LOPE 3 1 Estación Experimental de Zonas Áridas, Consejo Superior de Investigaciones Científicas, Calle General Segura 1, E-04001 Almería, Spain 2 Laboratoire de Parasitologie Evolutive, CNRS UMR 7103, Université Pierre et Marie Curie, 7 quai St. Bernard, Case 237, F-75252 Paris Cedex 05, France 3 Departamento de Ciencias Morfológicas y Biología Celular y Animal, Facultad de Ciencias, Universidad de Extremadura, Avenida de Elvas s/n, E-06071 Badajoz, Spain
منابع مشابه
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...
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Parents are selected to maximize their fitness by allocating care among their progeny in relation to the differential reproductive value of offspring. Nestlings have been hypothesized to signal need for parental care reliably through their begging behavior, but offspring condition as reflected by their reproductive value may likewise affect begging and hence provisioning. We assessed the relati...
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...
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ABSTRACT.-Parasites may affect host behavior in a number of ways, including their locomotory performance. We investigated whether the number of holes produced by the feather louse (Myrsidea rustica) affected flight behavior in adult male Barn Swallows (Hirundo rustica) by video-taping flight performance of individuals during escape and level flight. Percentage of time spent flapping during fora...
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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