نتایج جستجو برای: post nestling
تعداد نتایج: 405563 فیلتر نتایج به سال:
For burrow-nesting seabirds, investigators have examined nestling diet by attaching harnesses to the bills of nestlings to intercept food delivered by the parent. To determine whether this method provides an unbiased estimate of nestling diet, we evaluated its effect on the provisioning behavior of Tufted Puffins (Fratercula cirrhata) nesting on Triangle Island, British Columbia. Adults deliver...
—The Yellow Warbler (Dendroica petechia) has a mating system characterized by monogamy and biparental care, and has the broadest breeding distribution of any Dendroica species. When faced with a short breeding season and unpredictable conditions at high latitude, they display physiological responses to help optimize the tradeoff between individual risk and reproductive success. Because these ci...
Prey animals may react differently to predators, which can thus raise plasticity in risk-taking behaviour. We assessed the behavioural responses of nestling-feeding collared flycatcher (Ficedula albicollis) parents towards different avian predator species (Eurasian sparrowhawk, long-eared owl) and a non-threatening songbird (song thrush) by measuring latency resume feeding activity. found that ...
The role of the male and female in incubation eggs is unknown 30 70 species Australian honeyeaters, but most remainder, only thought to incubate. Nevertheless, by both known occur six species, including Brown-headed Honeyeater Melithreptus brevirostris. I observed video-recorded activities at two nests one group four Black-chinned Honeyeaters M. gularis south-eastern Queensland. Nest attentiven...
Variation in the prenatal and postnatal environments can have long-term effects on adult phenotype. In humans and other animals, exposure to stressors can lead to long-term changes in physiology. These changes may predispose individuals to disease, especially disorders involving energy metabolism. In addition, by permanently altering metabolic rates and energy requirements, such effects could h...
Phenotypic plasticity has recently been proposed to increase population viability 15 when rapid anthropogenic environmental changes cannot be tracked by means of evolution. 16 This assumes that environmental changes do not constrain phenotypic plasticity itself, which 17 has rarely been examined in natural populations. In areas of climate warming, many long-18 distance migratory birds breed inc...
—Studies on breeding biology in Neotropical birds are crucial for understanding different aspects of their life histories and also for their conservation. We describe the nesting biology of the Red-crested Cardinal (Paroaria coronata) in central Argentina, a common suboscine that inhabits south temperate forests. We monitored 367 nests from October to February 2005–2008. Nest initiation followe...
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