منابع مشابه
Brown-headed Cowbird (molothrus Ater) Parasitism on Warbling Vireos (vireo Gilvus) in Southwest Colorado Catherine
A8s~~nc~.-From May through July, 1993-1998 and 2001, effects of Brown-headed Cowbird (Molothrus ater) parasitism on 36 Warbling Vireo (Vireo gilvus) nests were documented in southwest Colorado. Overall parasitism was 75.0% and was the major source of nest failure. Among vireo nests that were not depredated, a significantly lower proportion of parasitized nests (10.2%) than nonparasitized nests ...
متن کاملGenetic and temporal patterns of multiple parasitism by brown-headed cowbirds (Molothrus ater) on song sparrows (Melospiza melodia)
Identifying the factors used by an avian brood parasite to select host nests is important in understanding the determinates of individual reproductive success, yet such factors are poorly known for most parasitic species. Insights into these factors may come from understanding the conditions under which female parasites lay more than one egg per host nest (multiple parasitism). Using genetic te...
متن کاملConventional oil and natural gas infrastructure increases brown-headed cowbird (Molothrus ater) relative abundance and parasitism in mixed-grass prairie
The rapid expansion of oil and natural gas development across the Northern Great Plains has contributed to habitat fragmentation, which may facilitate brood parasitism of ground-nesting grassland songbird nests by brown-headed cowbirds (Molothrus ater), an obligate brood parasite, through the introduction of perches and anthropogenic edges. We tested this hypothesis by measuring brown-headed co...
متن کاملIn the company of cowbirds, Molothrus ater ater: robust patterns of sociability predict reproductive performance.
Many species exhibit behavioral tendencies that are stable over time and across contexts. Robust variation in sociability, or the propensity to approach others, is widespread across the vertebrates. Nonetheless, the influence of sociability on reproductive performance is largely unknown. In this study, we explore the relationship between sociability and reproductive behavior in flocks of Brown-...
متن کاملRobust Fall Social Displays Predict Spring Reproductive Behavior in BrownHeaded Cowbirds (Molothrus ater ater)
The ability to engage others in close proximity may be an essential component of social life and shapes the development of social skills. Variation in the willingness to initiate and sustain close interaction with conspecifics is known as sociability. The Brown-headed Cowbird (Molothrus ater) uses an affiliative display called the head-down to bring individuals into close proximity. During fall...
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ژورنال
عنوان ژورنال: Science
سال: 1893
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-22.565.305