Buscar
Mostrando ítems 41-50 de 108
The economics of nestmate killing in avian brood parasites: A provisions trade-off
(Oxford Univ Press Inc, 2012-01)
Some brood parasites kill all their host's offspring shortly after hatching, whereas others are tolerant and are reared in mixed host-parasite broods. This difference may arise because nestling parasites face a "provisions ...
A novel method of rejection of brood parasitic eggs reduces parasitism intensity in a cowbird host
(The Royal Society, 2013-03)
The hosts of brood parasitic birds are under strong selection pressure to recognize and remove foreign eggs from their nests, but parasite eggs may be too large to be grasped whole and too strong to be readily pierced by ...
Lack of effect of microhabitat charaacteristics on nest predation and brood parasitims in creamy-bellied thruss (Turdus Amaurochalinus)
(Neotropical Ornithological Society, 2013-11)
Nest predation and brood parasitism are key factors affecting nest survival in passerine birds. As a result, birds may select nest sites that minimize the probability of nests being found by predators or by brood parasites. ...
Effects of nest-site characteristics and parental activity on cowbird parasitism and nest predation in Brown-and-yellow MarshbirdsEfectos de las características del sitio de nidificación y actividad parental en el parasitismo de cría por tordos y predación de nidos en Pseudoleistes virescens
(Wiley Blackwell Publishing, Inc, 2009-03)
Nest-site selection and nest defense are strategies for reducing the costs of brood parasitism and nest predation, two selective forces that can influence avian nesting success and fitness. During 2001-2002, we analyzed ...
Impact of Shiny Cowbird and botfly parasitism on the reproductive success of the globally endangered Yellow Cardinal Gubernatrix cristata
(Cambridge University Press, 2015-09)
The Yellow Cardinal Gubernatrix cristata is a globally endangered passerine endemic to southern South America. Although the conservation status of this species is alarming, there is no information about factors that affect ...
Can nest predation explain the lack of defenses against cowbird brood parasitism in the Rufous-collared sparrow (Zonotrichia capensis)?¿Puede la depredación de nidos explicar la falta de defensas de Zonotrichia capensis contra el parasitismo de cría de M. Bonariensis?
(American Ornithologists' Union, 2013-07)
Although interspecific avian brood parasitism usually lowers host productivity, some species lack any defense against parasites. We analyzed the effect of parasite egg removal or nest desertion following a parasitism event ...
Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs
(American Ornithologists' Union, 2016-04)
Como parte del proceso coevolutivo entre los parásitos de cría y sus hospedadores, estos últimos han desarrollado diferentes estrategias para discriminar y rechazar los huevos parásitos. Este proceso de reconocimiento y ...
Function of egg punctures by Shiny Cowbirds in parasitized and nonparasitized Creamy-bellied Thrush nestsFunción de la picadura de huevos por parte del tordo renegrido Molothrus bonariensis en nidos parasitados y no-parasitados de Turdus amaurochalinus
(Wiley Blackwell Publishing, Inc, 2009-12)
Las aves parasitas usualmente remueven o pican los huevos de sus hospedadores. Se han propuesto varias hipótesis para explicar la función de este comportamiento. El remover o picar los huevos del hospedador podría mejorar ...
Do sex ratio and development differ in sexually size-dimorphic shiny cowbirds (Molothrus bonariensis) parasitizing smaller and larger hosts?
(Wiley, 2013-10)
Two possible patterns of bias in primary sex ratio have been proposed for size-dimorphic brood parasites that do not evict host chicks: (1) larger males should be laid at greater frequency in hosts larger than the parasite ...
Programa de Manejo de la especie Molothrus bonariensis en Reserva Ecológica Siboney-Juticí. Resumen Ejecutivo
(2017)
El presente trabajo propone el plan de manejo para la especie Molothrus bonariensis (pájaro vaquero). Su distribución es desde Panamá hasta el sur de Argentina, en las Antillas Menores, las Bahamas y el sureste de Estados ...