Timing of reproduction and egg quality covary with temperature in the insectivorous Barn Swallow, Hirundo rustica
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چکیده
منابع مشابه
A Trade-Off between Reproduction and Feather Growth in the Barn Swallow (Hirundo rustica)
Physiological trade-offs mediated by limiting energy, resources or time constrain the simultaneous expression of major functions and can lead to the evolution of temporal separation between demanding activities. In birds, plumage renewal is a demanding activity, which accomplishes fundamental functions, such as allowing thermal insulation, aerodynamics and socio-sexual signaling. Feather renewa...
متن کاملDifferences in begging behaviour between barn swallow, Hirundo rustica, nestlings.
Recent models of parent-offspring communication suggest that nestling begging reliably reflects food requirements, and therefore should increase with nestling need. Need may be affected by short-term variations in hunger, as well as by long-term factors such as relative size, growth rate and body condition. In the present study, the brood sizes of barn swallows were manipulated to create differ...
متن کاملHaematocrit correlates with tail ornament size in three populations of the Barn Swallow (Hirundo rustica)
Advertisement models of sexual selection propose that exaggerated male secondary sexual characters could reliably signal male health and vigour by having the function of ‘handicaps’, i.e. characters that impose a cost to their bearer (Zahavi 1975, 1977; Heywood 1989; Grafen 1990). A commonly cited example of such characters is the ornamental tails of several bird species (Darwin 1871; Fisher 19...
متن کاملViability Is Associated with Melanin-Based Coloration in the Barn Swallow (Hirundo rustica)
Pigmentation of body surface in animals can have multiple determinants and accomplish diverse functions. Eumelanin and pheomelanin are the main animal pigments, being responsible of yellow, brownish-red and black hues, and have partly common biosynthetic pathways. Many populations of vertebrates show individual variation in melanism, putatively with large heritable component. Genes responsible ...
متن کاملSexual Dimorphism in Melanin Pigmentation, Feather Coloration and Its Heritability in the Barn Swallow (Hirundo rustica)
Melanin is the main pigment in animal coloration and considerable variation in the concentrations of the two melanin forms (pheo- and eumlanin) in pigmented tissues exists among populations and individuals. Melanin-based coloration is receiving increasing attention particularly in socio-sexual communication contexts because the melanocortin system has been hypothesized to provide a mechanistic ...
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ژورنال
عنوان ژورنال: Functional Ecology
سال: 2004
ISSN: 0269-8463,1365-2435
DOI: 10.1046/j.0269-8463.2004.00808.x