Results 171 to 180 of about 5,511 (198)
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1997
Abstract The evolutionary, ecological and behavioral questions posed by obligate brood parasites are among the most intriguing of all contemporary ornithological topics. Avian brood parasites lay their eggs in the nests of other birds and may be a major contributing factor driving several species of songbirds to near extinction.
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Abstract The evolutionary, ecological and behavioral questions posed by obligate brood parasites are among the most intriguing of all contemporary ornithological topics. Avian brood parasites lay their eggs in the nests of other birds and may be a major contributing factor driving several species of songbirds to near extinction.
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Relatedness Constrains Virulence in an Obligate Avian Brood Parasite
Ornithological Science, 2016Abstract Virulence, the amount of harm a parasite inflicts on its host, is integral to elucidating the evolution of obligate avian brood parasitism. However, we lack information regarding how relatedness is linked to changes in behavior and the degree of harm that brood parasites cause to their hosts (i.e., virulence).
James W. Rivers, Brian D. Peer
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Modelling the arms race in avian brood parasitism
Evolutionary Ecology, 1998In brood parasitism, interactions between a parasite and its host lead to a co-evolutionary process called an arms race, in which evolutionary progress on one side provokes a further response on the other side. The host evolves defensive means to reduce the impact of parasitism, while the parasite evolves means to counter the host's defence.
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Avian Brood Parasitism: Variation in Host Repsonse
2016Obligate brood parasites forego the cost of parental care by laying their eggs in the nest of other species, often to the detriment of that species. About 1% of all bird species are obligate brood parasites, but the most well-known and commonly studied are the many cuckoo and cowbird species.
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Polymorphism in Avian Brood Parasitism: A Coevolutionary Perspective
Ornithological Science, 2016Polymorphism provides a classic example of adaptive evolution. A great advantage of studying polymorphism is that the phenotype can serve as a genetic marker; therefore, researchers can take full advantage of this to test a hypothesis based on Darwin's principle of adaptive evolution.
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Immune Function in an Avian Brood Parasite and Its Nonparasitic Relative
Physiological and Biochemical Zoology, 2013Organisms that breed multiple times must trade off resources between current and future reproduction. In many species, sexual selection can lead to reduced levels of immune function in males because they invest heavily in current reproduction at the expense of self-maintenance.
Loren, Merrill +3 more
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Long‐term coevolution between avian brood parasites and their hosts
Biological Reviews, 2013ABSTRACTCoevolutionary theory predicts that the most common long‐term outcome of the relationships between brood parasites and their hosts should be coevolutionary cycles based on a dynamic change selecting the currently least‐defended host species, given that when well‐defended hosts are abandoned, hosts will be selected to decrease their defences as ...
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Evolutionary Rates and Host Defenses Against Avian Brood Parasitism
The American Naturalist, 1975Experiments investigating host defenses against the brood parasitism of the brown-headed cowbird revealed that, within most species, nearly all individuals either accept or reject cowbird eggs. Therefore, species are easily designated as "accepters" or "rejecters". The results of these experiments differ somewhat from data on natural cowbird parasitism,
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