نتایج جستجو برای: breeding ground
تعداد نتایج: 200168 فیلتر نتایج به سال:
Insufficient reproduction as a consequence of predation on eggs and chicks is major determinant population decline in ground-nesting birds, including waders. For many populations, there an urgent need to maintain breeding populations at key sites, conservation practitioners find viable management solutions reduce predation. One tool available the practitioner fences that exclude predators from ...
Interactions between whale-watching boats and cetaceans can lead to changes in their behavior. From a management perspective, it is important understand how this type of disturbance be translated into physiological effects, such as energetic metabolism. Humpback whales ( Megaptera novaeangliae ) typically do not feed while breeding grounds, thus they depend on finite energy reserves. The effect...
Most birds incubate their eggs, which requires time and energy at the expense of other activities. Birds generally have two incubation strategies: biparental where both mates cooperate in incubating uniparental a single parent incubates. In harsh unpredictable environments, is challenging due to high energetic demands variable resource availability. We studied relationships between behaviour sa...
Biological impacts of climate change are exemplified by shifts in phenology. As the timing of breeding advances, the within-season relationships between timing of breeding and reproductive traits may change and cause long-term changes in the population mean value of reproductive traits. We investigated long-term changes in the timing of breeding and within-season patterns of clutch size, egg vo...
Understanding the impacts of climate on migratory species is complicated by the fact that these species travel through several climates that may be changing in diverse ways throughout their complete migratory cycle. Most studies are not designed to tease out the direct and indirect effects of climate at various stages along the migration route. We assess the impacts of spring and summer climate...
The aim of this study was to investigate the seasonal expression of androgen receptor (AR), estrogen receptors α and β (ERα and ERβ) and aromatase cytochrome P450 (P450arom) mRNA and protein by real-time PCR and immunohistochemistry in the wild ground squirrel (WGS) testes. Histologically, all types of spermatogenic cells including mature spermatozoa were identified in the breeding season (Apri...
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