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Documents disponibles écrits par cet auteur (13)
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Article
P. Bize, Auteur ; A. Roulin, Auteur ; J. L. Tella, Auteur ; L. F. Bersier, Auteur ; H. Richner, Auteur1. Parasitism is a non-negligible cost of reproduction in wild organisms, and hosts are selected to partition resources optimally between current and future reproduction. While parents can compensate for the cost of parasitism by increasing thei[...]
Article
R. Altwegg, Auteur ; M. Schaub, Auteur ; A. Roulin, Auteur
Article
A. Roulin, Auteur ; A. L. Ducrest, Auteur ; C. Dijkstra, AuteurDans Ardea (87(1) 1999)When the overall food demand of the young increases, parents can either increase their effort to feed the brood, potentially reducing their residual reproductive value, or alternatively maintain their effort, leading to offspring mortality. In l[...]
Article
A. Roulin, Auteur ; W. Müller, Auteur ; L. Sasvari, Auteur ; C. Dijkstra, Auteur ; A. L. Ducrest, Auteur ; Christian Riols, Auteur ; M. Wink, Auteur ; T. Lubjuhn, AuteurIn many bird populations, individuals display one of several genetically inherited colour morphs. Colour polymorphism can be maintained by several mechanisms one of which being frequency-dependent selection with colour morphs signalling alternat[...]
Article
A. Roulin, Auteur ; B. Ducret, Auteur ; P. A. Ravussin, Auteur ; R. Altwegg, AuteurVariation in coloration with a strong underlying genetic basis is frequently found in birds, insects, anurans, molluscs and plants. Although such a variation can be large, little is known about its functional value. Correlative data, however, ca[...]
Article
A. Roulin, AuteurSeveral hypotheses have been proposed to explain why food is found uneaten in or near nests of raptors, owls and shrikes. The 'insurance' hypothesis states that parents store food to buffer offspring against temporary food shortages generally du[...]
Article
B. Almasi, Auteur ; S. Jenni-eiermann, Auteur ; A. Roulin, Auteur ; L. Jenni, Auteur
Article
A. Roulin, AuteurGeographic variation in sexually selected traits is commonly attributed to geographic variation in the net benefit accrued from bearing such traits. Although natural and sexual selection are potentially important in shaping geographic variation.[...]
Article
A. Roulin, AuteurDans Ardea (87(2) 1999)In altricial birds fledglings may be selected for visiting nests of non-biological parents when the rearing conditions in the nest of origin are poor or when they have difficulty in finding food just after being independent. When nest-switching [...]
Article
A. Roulin, Auteur ; P. Bize, Auteur ; N. Tzaud, Auteur ; M. Bianchi, Auteur ; P. A. Ravussin, Auteur ; P. Christe, AuteurIn several colour polymorphic species, morphs differ in thermoregulation either because dark and pale surfaces absorb solar radiation to a different extent and/or because morphs differ in key metabolic processes. Morph-specific thermoregulation [...]
Article
R. Matics, Auteur ; G. Hoffmann, Auteur ; T. Nagy, Auteur ; A. Roulin, AuteurBetween 1998 and 2000, 64 breeding birds of Barn Owl in Hungary were checked for plumage coloration. No relationship between the colour morphs of partners were found. Thus, coloration does not influence pairing.
Article
A. Roulin, AuteurDuring a 12-year study of the Barn Owl Tyto alba I investigated the short- and long-term fitness correlates of hatching date, brood size and hatching rank. Observations showed that nestling survival was lower at the end of the breeding season an[...]
