نتایج جستجو برای: flying squirrels
تعداد نتایج: 11930 فیلتر نتایج به سال:
Abstract It is widely assumed that spillover of alien parasites to native host species severely impacts naïve populations, ultimately conferring a competitive advantage invading hosts introduced them. Despite such host-switching events occurring in biological invasions, studies demonstrating the impact macroparasites on animal are surprisingly few. In Europe, red squirrels ( Sciurus vulgaris) r...
Abstract Background For cavity-nesting birds, the nest entrance plays an important role in preventing predators from accessing nests. Several species of nuthatches use mud to narrow cavities. In theory, smaller hole size, more effective it is against predators; however, few studies have tested whether narrowing size can affect estimation threat levels birds. Methods Using dummy experiments, we ...
Hibernation patterns were monitored continuously for 2.5 years in female squirrels that were neurologically intact or in which the hypothalamic suprachiasmatic nucleus (SCN) was completely ablated (SCNx). The number of hibernation bouts in SCNx squirrels increased by 159%, total hibernation time increased by 58%, and periodic arousals from hibernation were 47% longer in SCNx than in control squ...
Leprosy, caused by infection with Mycobacterium leprae or the recently discovered Mycobacterium lepromatosis, was once endemic in humans in the British Isles. Red squirrels in Great Britain (Sciurus vulgaris) have increasingly been observed with leprosy-like lesions on the head and limbs. Using genomics, histopathology, and serology, we found M. lepromatosis in squirrels from England, Ireland, ...
A central principle in life-history theory is that reproductive effort negatively affects survival. Costs of reproduction are thought to be physiologically based, but the underlying mechanisms remain poorly understood. Using female North American red squirrels (Tamiasciurus hudsonicus), we test the hypothesis that energetic investment in reproduction overwhelms investment in antioxidant protect...
Enterocytozoon bieneusi is a common opportunistic pathogen causing diarrhea and enteric disease in a variety of animal hosts. Although it has been reported in many animals, there is no published information available on the occurrence of E. bieneusi in red-bellied tree squirrels. To understand the occurrence, genetic diversity, and zoonotic potential of E. bieneusi in red-bellied tree squirrels...
The foraging behavior of Eastern gray squirrels (Sciurus carolinensis) on the University of Maryland campus was compared to the Tivoli neighborhood in the Wheaton-Glendale area of Maryland. Three different sizes of banana slices were presented to squirrels to determine if individuals exhibited a selection preference. Results were compared to the optimal foraging model. The peak activity time of...
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