نتایج جستجو برای: flying squirrels
تعداد نتایج: 11930 فیلتر نتایج به سال:
Rodent-flea-plague relationships were examined at sites located at higher elevations of San Diego County during 1991-2002. The most frequently sampled rodents were the California ground squirrel, Spermophilus beecheyi, and white-footed mice, Peromyscus spp. Higher seasonal mean dependent variables (prevalences of squirrels and indices of O. montana), higher mean amounts of seasonal rainfall, an...
1. Previous studies have demonstrated that wind dispersal is an effective mode of seed dispersal for pines ( Pinus , Pinaceae) with seeds weighing <90 mg, but not for largerseeded ( ≥ 90 mg) pines. Consequently, most large-seeded pines rely on birds in the family Corvidae for seed dispersal, but some do not, and most of their seeds fall near the parent tree. Why seeds of these pines are not dis...
Larvae of the bot fly Cuterebra emasculator Fitch infest tree squirrels and chipmunks from the Atlantic Ocean to just west of the Mississippi River and from southern Canada to the Gulf Coast of the United States. Whether the species is present in all states and provinces in this region is not well documented. Because there are few published records of C. emasculator in South Carolina, we gather...
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, ...
Asymmetry in motor patterns is present in a wide variety of animals. Many lateralized behaviors seem to depend on brain asymmetry, as it is the case of different tasks associated to food handling by several bird and mammal species. Here, we analyzed asymmetry in handling behavior of pine cones by red squirrels (Sciurus vulgaris). Red squirrels devote most of their daily activity to feeding, thu...
From February 1998 to July 1999, 65 western gray squirrels (Sciurus griseus griseus) were trapped at three sites in Klickitat County, Washington (USA) as part of a home range and habitat use study. No squirrels (0/9) with mange lesions were identified in the initial trapping session (February and March 1998). During all subsequent trapping sessions (August 1998 through July 1999), squirrels wit...
l. Entrainment of circadian wheel running activity was monitored over a period of several months for northern grasshopper mice (Onychomys [eucogasrer) and golden mantled ground squirrels (Sperm&i/us lateralis) housed out-of-doors and exposed to direct sunlight (average light intensity = 55,000 Ix). 2. Sighted animals entrained their activity rhythms to the natural photoperiod; the mice were noc...
To determine how squirrels return to remembered locations in an arboreal environment, wild fox squirrels (Sciurus niger) were trained on an outdoor vertical maze. Squirrels were trained on 1 route and tested with all routes accessible. Possible mechanisms of spatial orientation were distinguished with manipulations such as rotations, shifts, and blocked routes. Squirrels consistently used an ex...
The first record of sucking louse, Neohaematopinus callosciuri, infesting pallas squirrels in Japan.
A species of sucking louse, Neohaematopinus callosciuri, was found for the first time in Japan. The species was found on an invasive species of squirrel, Pallas squirrel, Callosciurus erythraeus, in the Kamakura district, Kanagawa Prefecture, Japan. A total of 52 lice were obtained from 22 of 104 squirrels captured. The lice were about three times more prevalent in male squirrels than in female...
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