نتایج جستجو برای: clutch size
تعداد نتایج: 557275 فیلتر نتایج به سال:
—Seasonal and interannual variability in laying date, clutch size, egg volume and hatching asynchrony of four lark species in Mediterranean Spain Aims: To describe the variation in laying date, clutch size, egg volume and hatching asynchrony of four lark species (Skylark Alauda arvensis, Short-toed Lark Calandrella brachydactyla, Thekla Lark Galerida theklae and Lesser Short-toed Lark Calandrel...
Physiological trade-offs mediated by limiting energy, resources or time constrain the simultaneous expression of major functions and can lead to the evolution of temporal separation between demanding activities. In birds, plumage renewal is a demanding activity, which accomplishes fundamental functions, such as allowing thermal insulation, aerodynamics and socio-sexual signaling. Feather renewa...
Terms: parasitoid wasps, sex ratio, host size, local mate competition, host size model, host quality model, Waage's hypothesis, haplodiploid sex determination, differential mortality of the sexes, body size, development time, dispersal, behavioral constraints, sperm depletion, extrachromosomal factors, genetic variation, clutch size, methodological suggestions, assumptions of sex ratio models, ...
At Belmont, Lower Hutt, a population of starlings which nested in 500 nest boxes on 1500 ha of pasture land was studied from 1970 to 1979. In total, 750 breeding females and 60 males were individually banded, and of 4006 chicks that Hedged 258 females returned to nest in the study area. In different years, 3-60% of the females attempted a second clutch after a successful first brood. Clutch siz...
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