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BEHAVIORAL DEFENSES AGAINST AVIAN BROOD PARASITISM IN SYMPATRIC AND ALLOPATRIC HOST POPULATIONS
TLDR
Results support the hypothesis that recognition of cowbirds and their eggs evolved as adaptations to counter cowbird parasitism and not some other selection pressure, and the expression of anti‐parasite defenses by some individuals within allopatric populations further suggests these traits may be controlled genetically but persist in such areas. Expand
Removal of Yellow Warbler Eggs in Association with Cowbird Parasitism
TLDR
The results suggest that cowbirds can remove at least two eggs without risking desertion by the warblers, as predicted by the "host deception" hypothesis. Expand
A MORPHOLOGICAL APPROACH TO THE STUDY OF AVIAN COMMUNITY ORGANIZATION
--We have undertaken a morphological approach to the analysis of community relationships among species of birds by using eight characters to define a morphological hypervolume. We describe methods ofExpand
Determining the reproductive behaviour of individual brown-headed cowbirds using microsatellite DNA markers
TLDR
Parents analyses of young and adults from a marked population at Delta, Manitoba for 1 year revealed key features of the reproductive behaviour of the brown-headed cowbird, including monogamy is the predominant genetic mating system, and realized annual fecundity of females may be lower than previously suggested. Expand
Parentage and kinship studies in an obligate brood parasitic bird, the brown-headed cowbird (Molothrus ater), using microsatellite DNA markers.
TLDR
The usefulness of microsatellite DNA markers to determine parentage in a brood parasitic bird, the brown-headed cowbird, where, for a given offspring, no a priori knowledge of either parent is available is investigated. Expand
CORRELATES OF EGG REJECTION IN HOSTS OF THE BROWN-HEADED COWBIRD
TLDR
Rejection was also correlated with taxonomic affiliation, suggesting that once rejection evolves it is maintained, which implies that rejection is not costly and thus argues against an evolutionary equilibrium. Expand
Evolution of host defenses against brood parasitism : Implications of puncture-ejection by a small passerine
TLDR
These are the first observations of puncture-ejection by the Warbling Vireo, which is now the smallest species known to eject cowbird eggs in this manner, and results by default support the evolutionary-lag hypothesis because the smaller species did not incur greater costs during punctured egg ejection than the larger species. Expand
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