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Documents disponibles écrits par cet auteur (14)
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Article
Masaru Hasegawa, Auteur ; Emi Arai, Auteur ; Takahiro Kato, AuteurMany empirical studies have focused on highly ornamented species to identify ecological factors that maintain the ornamentation or favour its exaggeration. By contrast, although reduction or loss of ornamentation appears to be widespread, specie[...]
Article
Masaru Hasegawa, Auteur ; Emi Arai, AuteurIn our rapidly urbanizing world, species utilizing anthropogenic resources would have positive population trends more than others, although its effect might depend on their ability to cope with environmental change. We tackled this issue using a[...]
Article
Masaru Hasegawa, Auteur ; Emi Arai, AuteurConvergent evolution provides strong evidence of the power of natural selection, particularly for distantly related taxa. Swallows and swifts are such distantly related taxa; both are specialised to feed on flying insects and have similar morpho[...]
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Masaru Hasegawa, Auteur ; Emi Arai, AuteurSevere climates provide excellent opportunities to study natural selection in a study population, particularly when surviving and non-surviving individuals are directly observed. Classic examples include the effects of cold, rainy weather on hir[...]
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Masaru Hasegawa, Auteur ; Emi Arai, Auteur ; Mamoru Watanabe, Auteur ; Masahiko Nakamura, AuteurRecent research has increasingly focused on female ornamentation, with several studies having investigated female ornaments in relation to reproduction. However, most previous studies have focused on single female ornaments, while females of num[...]
Article
Masaru Hasegawa, Auteur ; Emi Arai, Auteur ; Shosuke Ito, Auteur ; Kazumasa Wakamatsu, AuteurIn birds, even a minor difference in egg temperature (1–1.5 °C) has been shown to affect the fitness of offspring by changing hatching success, incubation period and nestling quality. Female, but not male, passerines develop brood patches. Thus [...]
Article
Rufous coloration associated with terrestrial locomotion in the adaptive radiation of Malagasy Couas
Masaru Hasegawa, Auteur ; Emi Arai, AuteurAdaptive radiation is a suitable system for the study of the (co)evolution of traits because phylogeographic constraints should be of minor importance. Adaptive radiation of beak morphology in birds is a classic example, but the evolution of oth[...]
Article
Masaru Hasegawa, Auteur ; Emi Arai, AuteurABSTRACT Among several types of parental care behavior, incubation behavior in passerine birds offers an ideal opportunity to study the link between female parental care and male ornamentation, because males generally lack an incubation patch, a[...]
Article
Masaru Hasegawa, Auteur ; Emi Arai, AuteurIt has recently been demonstrated that male ornaments feedback on their physiological state and this is expected to be followed by behavioral alterations in paternal care. However, only a few studies have shown the effects of experimental manipu[...]
Article
Emi Arai, Auteur ; Masaru Hasegawa, Auteur ; Masahiko Nakamura, Auteur ; Kazumasa Wakamatsu, AuteurPlumage color is a composite trait and each component can provide information regarding individual quality. Melanin-based color is one of the most common plumage coloration in birds. This color comprises two types of melanin pigments: eumelanin [...]
Article
Emi Arai, Auteur ; Masaru Hasegawa, Auteur ; Masahiko Nakamura, AuteurDans Bird Study (56 2009)Capsule Divorce in Barn Swallows could be explained by the mechanism of asynchronous arrival of mates.
Article
Masaru Hasegawa, Auteur ; Emi Arai, AuteurABSTRACT Direct evidence of infanticide is still scarce, which prevents understanding the evolutionary and ecological importance of infanticide. In Barn Swallows (Hirundo rustica) all direct evidence of infanticide has been gained from nestlings[...]
Article
Masaru Hasegawa, Auteur ; Emi Arai, Auteur
Article
Masaru Hasegawa, Auteur ; Emi Arai, Auteur ; Mamoru Watanabe, Auteur ; Masahiko Nakamura, AuteurThe European Barn Swallow Hirundo rustica rustica is a model system for studying female mate choice for indirect benefits, as the long tail of males, the target of female mate choice, is positively related to male viability. However, situations [...]
