Long-distance Commuting by Brown-headed Cowbirds in New Mexico
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Long-distance Commuting by Brown-headed Cowbirds in New Mexico
The Brown-headed Cowbird (Molothrus ater) is a widespread brood parasite that has attracted considerable recent attention as a possible threat to forestdwelling songbirds (e.g. Finch 1991, Robinson et al. 1995). Cowbirds are unusual among passerines in that their parasitic nature allows some populations to have spatially and temporally separate breeding and feeding activities (Rothstein et al. ...
متن کاملDevelopmental origins of sociality in brown-headed cowbirds (Molothrus ater).
Five variables were studied relating to the emergence of sociality in hand-reared cowbirds (Molothrus ater): proximity, sex assortment, reactions to adults, head-down displays, and vocalizations. The authors were especially interested in female sociality because adult female birds influence male courtship, song content, and use through proximity, attention, and displays. The authors found that ...
متن کاملDual Signaling during Mating in Brown-headed Cowbirds (Molothrus
:'Ifale hrown-headed cowbirds (,Uo!otbmJ ater) vocalize to females during pair formation, a period usually lasting several days. Males also vocalize to females in the seconds immediately prior to females' adopting copulatory postures. The two major classes of male vocalizations occurring during courtship and copulation arc songs and flight whistles. Observations across the species'''orth Americ...
متن کاملHost use and fecundity of individual female brown-headed cowbirds
Descriptions of the laying behaviours of obligate brood parasites such as the brown-headed cowbird, Molothrus ater, typically fall into one of two categories. These categories are ‘shotgun behaviour’, where females are predicted to distribute their eggs apparently at random between available host nests, or ‘host selection behaviour’, where females lay their eggs discriminately, placing them int...
متن کاملGenetic elucidation of host use by individual sympatric bronzed cowbirds (Molothrus aeneus) and brown-headed cowbirds (M. ater)
Species of avian brood parasites that use one or several species of hosts are called host specialists and generalists, respectively. To determine host use of individual bronzed cowbirds, Molothrus aeneus (Wagler, 1829), and brownheaded cowbirds, Molothrus ater (Boddaert, 1783), we assigned maternity to eggs using microsatellite DNA markers. We measured patterns of host use by individual sympatr...
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ژورنال
عنوان ژورنال: The Auk
سال: 2000
ISSN: 1938-4254,0004-8038
DOI: 10.1093/auk/117.3.795