Cowbird Egg in Crow Nest
نویسندگان
چکیده
منابع مشابه
Parental care of a cowbird host: caught between the costs of egg-removal and nest predation.
Avian brood parasites reduce host fitness through the addition of parasitic eggs and the removal of host eggs. Both parasitic egg-addition and host egg-removal may be important sources of selection on host behaviour, creating fitness trade-offs with selection imposed by nest predation. However, the relative costs hosts suffer from egg-addition and host egg-removal and the responses to these cos...
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Variation in egg size and shape of the Hooded Crow Corvus corone cornix was investigated in the National Park Ujcie Warty, western Poland, in 2000 and 2001. Mean clutch size was 4.55±0.79 (n=40). Coefficients of variation for clutch means ranged from 2.00±1.16 (breadth) to 3.35±1.76 (elongation index). Mean repeatability estimates were 0.69, 0.71, 0.73, and 0.62 for length, breadth, volume, ...
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1E-mail: bsanderc@ksu��edu 2Present address: Department of Biological Sciences, Virginia Polytechnic Institute and State University, 2125 Derring Hall, Blacksburg, Virginia 24061, USA�� 3Present address: Tetra Tech EC, 1750 SW Harbor Way, Portland, Oregon 97201, USA�� Abstract��—Brood parasitism and predation are t�o factors that limit seasonal fecundity in grassland songbirds�� We removed Bro...
متن کاملNest desertion by blue-gray gnatcatchers in association with brown-headed cowbird parasitism
The blue-gray gnatcatcher, Polioptila caerulea, is one of the smallest regular hosts of the brown-headed cowbird, Molothrus ater. Gnatcatchers typically raise none of their own young when parasitized, yet anti-parasite behaviours have not been reported. A blue-gray gnatcatcher population in which pairs often desert nests when parasitized by cowbirds was studied to examine the success of a deser...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1967
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay3005