نتایج جستجو برای: post nestling

تعداد نتایج: 405563  

2013
Kevin A. Caillouët Charles W. Robertson David C. Wheeler Nicholas Komar Lesley P. Bulluck

Sensitive indicators of spatial and temporal variation in vector-host contact rates are critical to understanding the transmission and eventual prevention of arboviruses such as West Nile virus (WNV). Monitoring vector contact rates on particularly susceptible and perhaps more exposed avian nestlings may provide an advanced indication of local WNV amplification. To test this hypothesis we monit...

Journal: :Biology letters 2010
Nozomu J Sato Kihoko Tokue Richard A Noske Osamu K Mikami Keisuke Ueda

As avian brood parasitism usually reduces hosts' reproductive success, hosts often exhibit strong defence mechanisms. While such host defences at the egg stage (especially egg rejection) have been extensively studied, defence mechanisms at the nestling stage have been reported only recently. We found a previously unknown anti-parasitism behaviour in the large-billed Gerygone, which is a host sp...

Journal: :Journal of wildlife diseases 1975
E C Greiner

Three hundred and nine mourning doves (Zenaida macroura) from Lancaster County, Nebraska, were examined for species of Haemoproteus. Older doves possessed higher Haemoproteus prevalences than younger doves. Mean total prevalence for each dove age group was as follows: adults, 61% H. sacharovi and 83% H. maccallumi; immatures, 35% H. sacharovi and 42% H. maccallumi; and nestlings, 31% H. sacharo...

Journal: :Biology letters 2007
Michael Tobler Jan-Ke Nilsson Johan F Nilsson

The transfer of non-genetic resources from mother to the offspring often has considerable consequences for offspring performance. In birds, maternally derived hormones are known to influence a variety of morphological, physiological and behavioural traits in the chick. So far, the range of these hormonal effects involves benefits in terms of enhanced growth and competitive ability as well as co...

Journal: :Journal of evolutionary biology 2011
G Moreno-Rueda T Redondo

Theoretical models suggest that begging should be costly in order to be evolutionarily stable. However, evidence for such a cost is contradictory (e.g. for growth costs) or scant (e.g. for immunological costs). Here, we experimentally test the existence of both costs in southern shrike (Lanius meridionalis) nestlings. Nestlings were paired by nest of origin and similar body mass. In each pair, ...

2004
Francis Comets Ofer Zeitouni

We consider a class of ballistic, multidimensional random walks in random environments where the environment satisfies appropriate mixing conditions. Continuing our previous work [2] for the law of large numbers, we prove here that the fluctuations are gaussian when the environment is Gibbsian satisfying the “strong mixing condition” of Dobrushin and Shlosman and the mixing rate is large enough...

Journal: :Environmental toxicology and chemistry 2003
William W Bowerman David A Best Ohn P Giesy Mark C Shieldcastle Michael W Meyer Sergej Postupalsky James G Sikarskie

The relationship between regional reproduction rates of bald eagles (Haliaeetus leucocephalus) and concentrations of p.p'-dichlorodiphenyldichloroethylene (p,p'-DDE) and total polychlorinated biphenyls (PCBs) in blood plasma from nestling bald eagles was assessed. Blood was analyzed from 309 nestlings from 10 subpopulations of eagles across the Great Lakes region. Geometric mean concentrations ...

Journal: :Hormones and behavior 2008
Oliver P Love Tony D Williams

Optimal functioning of the hypothalamo-pituitary-adrenal (HPA) axis is paramount to maximizing fitness in vertebrates. Research in laboratory mammals has suggested that maternally-induced stress can cause significant variation in the responsiveness of an offspring's HPA axis involving both pre- and post-natal developmental mechanisms. However, very little is known regarding effects of maternal ...

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