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Documents disponibles écrits par cet auteur (8)
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Article
Ken Yasukawa, Auteur ; Emily J. Dorjath, Auteur ; Stephanie K. Morgan, AuteurRed-winged Blackbirds (Agelaius phoeniceus) experience high rates of nest predation and are therefore expected to exhibit adaptations to reduce the risk of eavesdropping by predators. We used a simulated predator and observations of adult and ne[...]
Article
ABSTRACT I observed male Red-winged Blackbirds (Agelaius phoeniceus) defend and provision nests, and I documented survival of pair-fed and female-fed broods to determine whether male parental behavior affects nestling survival and nest success. [...]
Article
Ken Yasukawa, Auteur ; Josie Lindsey-Robbins, Auteur ; Carol S. Henger, Auteur ; Mark E. Hauber, AuteurABSTRACT The Red-winged Blackbird (Agelaius phoeniceus; redwing) is a commonly used accepter host species that incubates eggs and cares for nestlings and fledglings of the obligate brood parasitic Brown-headed Cowbird (Molothrus ater; cowbird). [...]
Article
Ken Yasukawa, Auteur ; Hazel K. Berrios, Auteur ; Anthony W. Johannes, AuteurWe tested the nestling discrimination hypothesis by observing responses of female Red-winged Blackbirds (Agelaius phoeniceus) to playback of begging calls by conspecifics or Brown-headed Cowbirds (Molothrus ater). Female redwings departed the ne[...]
Article
Jacy Bernath-Plaisted, Auteur ; Ken Yasukawa, AuteurNestling begging and parental provisioning can attract nest predators and reduce reproductive success, so parents and their offspring might be expected to respond adaptively by minimizing predator-attracting cues when predators threaten nests. M[...]
Article
The ability of sexually mature non-territorial floaters to sire offspring affects the success of floating as a breeding strategy. Red-winged Blackbirds (Agelaius phoeniceus) have second-year (SY) and after-second-year (ASY) floater males, and ge[...]
Article
Ken Yasukawa, Auteur ; David A. Enstrom, Auteur ; Patricia G. Parker, Auteur ; Thomas C. Jones, AuteurThe epaulets of male Red-winged Blackbirds (Agelaius phoeniceus) are frequently cited as a sexually selected plumage ornament, but a number of laboratory and field studies provide little evidence that they are currently experiencing sexual selec[...]
Article
Ken Yasukawa, Auteur ; Jody Urish, Auteur ; Alan Her, Auteur ; Erin Light, AuteurAlthough individually distinct begging calls may permit parents to recognize their offspring, birds nesting in dense breeding colonies where fledglings intermingle might benefit from additional adaptations. For example, if the calls of all nestl[...]
