Ground Squirrels
Subtle short term physiological costs of an experimental augmentation of fleas in wild Columbian ground squirrels
... Columbian ground squirrels (Urocitellus columbianus) in Sheep River Provincial Park, AB, ...Columbian ground squirrels appear to rapidly manage parasite costs, probably through ...
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Thirteen lined ground squirrels (Ictidomys tridecemlineatus) show microstructural bone loss during hibernation but preserve bone macrostructural geometry and strength
... juvenile squirrels during hibernation ...juvenile squirrels during ...The squirrels in this study were not fluorochrome labeled, and consequently, pre- existing lacunae could not be distinguished ...
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Effects of tegaserod on bile composition and hepatic secretion in Richardson ground squirrels on an enriched cholesterol diet
... Richardson ground squirrels (Spermophilus richardsoni) were trapped wild near Calgary, and acclima- tized for a minimum period of four weeks by caging them individually in thermoregulated rooms on a 12 h/12 ...
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Differential effects of acetylcholine on coronary flow in isolated hypothermic hearts from rats and ground squirrels
... during hibernation. Our finding that ACh had a diminished effect on f C at 20˚C, and no effect at 7˚C, is supported by data from an in vivo study with ground squirrels (Milsom et al. 1988), which showed ...
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Thermal acclimation of surfactant secretion and its regulation by adrenergic and cholinergic agonists in type II cells isolated from warm active and torpid golden mantled ground squirrels, Spermophilus lateralis
... dunnarts, the response of isolated type II cells to carbamylcholine chloride remains the same, regardless of assay temperature (Ormond et al., 2001). This may enable dunnart type II cells to respond quickly to a ...
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Stable Isotopes and Radiocarbon Assess Variable Importance of Plants and Fungi in Diets of Arctic Ground Squirrels
... arctic ground squirrels near Atqasuk (70°29′N, 157°25′W) in northern Alaska from Batzli and Sobaski (1980) provide detailed direct measurements of arctic ground squirrel diets for July and August to ...
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Increase in cardiac myosin heavy chain (MyHC) alpha protein isoform in hibernating ground squirrels, with echocardiographic visualization of ventricular wall hypertrophy and prolonged contraction
... in ground squirrels is remarkable because it mimics many instances of cardioprotective expression of MyHC-α in other ...our ground squirrels, humans have proportions of MyHC-α mRNA approaching ...
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Food supplements modulate changes in leucocyte numbers in breeding male ground squirrels
... The immunosuppressive effect of testosterone has attracted attention as a potential mediator of a trade-off between immune function and dominance in male competition (Tang-Martinez and Taylor, 1998; Wedekind and Folstad, ...
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Trade offs between immunity and testosterone in male African ground squirrels
... During preliminary sampling, we found that the average circulating testosterone levels of male Cape ground squirrels was 1.88 ±0.34 ng ml −1 (min: 0.33 ng ml −1 , max: 8.7 ng ml −1 , N=33). We prepared ...
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Are long chain acyl CoAs responsible for suppression of mitochondrial metabolism in hibernating 13-lined ground squirrels?
... 13-lined ground squirrels the ‘rescuing’ effect of carnitine on mitochondrial respiration may require more time, on the scale of hours, and were therefore not observed in this ...
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Dynamic changes in global and gene specific DNA methylation during hibernation in adult thirteen lined ground squirrels, Ictidomys tridecemlineatus
... Hibernating mammals conserve energy in the winter by undergoing prolonged bouts of torpor, interspersed with brief arousals back to euthermia. These bouts are accompanied by a suite of reversible physiological and ...
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Bone strength is maintained after 8 months of inactivity in hibernating golden mantled ground squirrels, Spermophilus lateralis
... hibernating ground squirrels, hibernating animals had an increased number of lacunae and an overall ‘foamy’ appearance, consistent with osteocytic osteolysis (Haller and Zimny, ...
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A test of alternative models for increased tissue nitrogen isotope ratios during fasting in hibernating arctic ground squirrels
... (Storey, 2010). In small hibernators, periodic rewarming during arousals creates a heavy workload on the heart as it circulates the blood heated by non-shivering thermogenesis in brown adipose tissue (Storey, 2010). ...
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Regulation of succinate fuelled mitochondrial respiration in liver and skeletal muscle of hibernating thirteen lined ground squirrels
... One of the most potent and well-characterized inhibitors of SDH is oxaloacetate (OAA) (Wojtczak et al., 1969; Zeylemaker et al., 1969), and a few studies of hibernators have suggested that OAA inhibits SDH activity ...
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Sexual size dimorphism in ground squirrels (Rodentia: Sciuridae: Marmotini) does not correlate with body size and sociality
... in ground squirrels ...among ground squirrels, we can a priori expect that these measures will be highly correlated across all species included (we tested the correlation by Pearson test for ...
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Bartonella Strains from Ground Squirrels Are Identical to Bartonella washoensis Isolated from a Human Patient
... California ground squir- rels which are identical or very similar to ...where squirrels infected with ...California ground squirrels, as well as being very popular recreational ...California ...
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Myostatin levels in skeletal muscle of hibernating ground squirrels
... The present study investigated the signaling of myostatin through the SMAD2 pathway at six time points over the course of a hibernation bout in thirteen-lined ground squirrels. Because this signaling could ...
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Parasympathetic influence on heart rate in euthermic and hibernating ground squirrels
... golden-mantled ground squirrels breathe continuously ...mantled ground squirrels used in the present study exhibited an episodic breathing pattern ...
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Entraining to the polar day: circadian rhythms in arctic ground squirrels
... in ground squirrels (Hut et ...arctic ground squirrels; ectotherms can readily be entrained by temperature, but resistance to temperature entrainment is a general property of circadian clocks ...
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VAGAL INFLUENCE ON HEART RATE IN HIBERNATING GROUND SQUIRRELS
... to 2h:22h L:D (lights on 10:00h). During this period, the ground squirrels had access to laboratory chow and water ad libitum but were not handled or disturbed. Most animals had begun to hibernate before ...
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