The effect of Magpie breeding density and synchrony on brood parasitism by Great Spotted Cuckoos
Article Abstract:
Temporal and spatial proximity between Black-billed Magpie (Pica pica) nests reduces the risk of parasitism by Great Spotted Cuckoos (Clamator glandarius). Female cuckoos generally lay eggs during the egg-laying period of magpies and less often before initiation of the clutch or when the clutch is finished. The chances of finding a nest at the right stage for parasitism decreases when the synchrony of magpies laying eggs is high. Close spatial proximity results in greater aggregation of hosts which probably permits more effective defense against parasitism. The spatial dispersion of magpies depends on other ecological factors.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1996
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Communal parental care by monogamous magpie hosts of fledgling Great Spotted Cuckoos
Article Abstract:
Fledgling periods are very important for avian brood parasites. One example, fledgling Great Spotted Cuckoos, generally form a group with other fledgling cuckoos. The size of the group ranges from one to five fledglings that have their origin from one to four various nests. A group of Black-billed magpies attend each group of fledgling cuckoos. The rate of feeding of the cuckoos is directly proportional to the number of cuckoos per group and the number of adult magpies attending the group. The flocking behavior apparently is good for the fledglings as each fledgling in larger group receives more food.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1995
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Context and frequency of infanticide in communally breeding Guira Cuckoos
Article Abstract:
Research is presented concerning the influence of infanticide on the reduction of brood success in communally nesting Guira Cuckoos in Brazil. The provision of breeding opportunity through the practice of infanticide is discussed.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 2001
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