scholarly journals METABOLIC ARREST DURING HIBERNATION! CARDIAC REGULATION OF PYRUVATE DEHYDROGENASE (PDH) IN A HIBERNATING GROUND SQUIRREL (ICTIDOMYS TRIDECEMLINEATUS)

2015 ◽  
Vol 31 (10) ◽  
pp. S225 ◽  
Author(s):  
S. Wijenayake ◽  
S.N. Tessier ◽  
K.B. Storey
Keyword(s):  
Pyruvate Dehydrogenase ◽  
Ground Squirrel ◽  
Ictidomys Tridecemlineatus ◽  
Cardiac Regulation ◽  
Metabolic Arrest

Characterisation of a novel UV filter in the lens of the thirteen-lined ground squirrel (Ictidomys tridecemlineatus)

2014 ◽  
Vol 121 ◽  
pp. 114-120 ◽  
Author(s):  
Brian Lyons ◽  
Peter Karuso ◽  
Joanne F. Jamie ◽  
Mukoma F. Simpanya ◽  
Frank Giblin ◽  
...  
Keyword(s):  
Ground Squirrel ◽  
Uv Filter ◽  
Ictidomys Tridecemlineatus

scholarly journals Social conditioned place preference in the captive ground squirrel (Ictidomys tridecemlineatus): Social reward as a natural phenotype.

2015 ◽  
Vol 129 (3) ◽  
pp. 291-303 ◽  
Author(s):  
Garet P. Lahvis ◽  
Jules B. Panksepp ◽  
Bruce C. Kennedy ◽  
Clarinda R. Wilson ◽  
Dana K. Merriman
Keyword(s):  
Conditioned Place Preference ◽  
Ground Squirrel ◽  
Place Preference ◽  
Social Reward ◽  
Ictidomys Tridecemlineatus

scholarly journals Differential responses of prairie rodents to edge effects from recreational trails

2020 ◽  
Vol 41 ◽  
pp. 113-140
Author(s):  
Cameron M. Shorb ◽  
Laur A. Freymiller ◽  
Daniel L. Hernandez
Keyword(s):  
Edge Effects ◽  
Ground Squirrel ◽  
Common Phenomenon ◽  
Motion Sensing ◽  
Specific Effects ◽  
Ictidomys Tridecemlineatus ◽  
Habitat Edge ◽  
Species Specific ◽  
Recreational Trails ◽  
Ecological Variable

Edge effects are a common phenomenon in which an ecological variable changes with respect to distance from a habitat edge. Recreational trails may constitute a habitat edge for prairie rodents because of high human presence, high predator presence, or limited shelter compared to the prairie core. Despite the prevalence of trails in conservation parcels, their effect on wildlife distribution remains largely unstudied. We examined the impacts of recreational trails on small mammal activity in the restored prairies of the Cowling Arboretum at Carleton College. The prairies were restored from 1995 to 2008 and now comprise a contiguous prairie block of approximately 155 ha. Over 2 consecutive summers, we used infrared motion-sensing cameras to record the relative amount of time rodents spend at baited stations placed at different distances from the trail. The results varied between taxa: voles (Microtus spp.) avoided trail edges whereas mouse (Cricetidae and Dipodidae) and thirteen-lined ground squirrel (Ictidomys tridecemlineatus) activity was unaffected by trail proximity. Trails may therefore have species-specific effects on small mammals, with potential consequences for the connectivity and distribution of populations.

scholarly journals Changes in ventral respiratory column GABAaR ε- and δ-subunits during hibernation mediate resistance to depression by EtOH and pentobarbital

2011 ◽  
Vol 300 (2) ◽  
pp. R272-R283 ◽  
Author(s):  
K. B. Hengen ◽  
T. M. Gomez ◽  
K. M. Stang ◽  
S. M. Johnson ◽  
M. Behan
Keyword(s):  
Cerebral Cortex ◽  
Neuronal Activity ◽  
Cortical Neurons ◽  
Ground Squirrel ◽  
Inhibitory Interneurons ◽  
Rt Pcr ◽  
Western Blots ◽  
Cardiorespiratory Function ◽  
Ictidomys Tridecemlineatus ◽  
High Doses

During hibernation in the 13-lined ground squirrel, Ictidomys tridecemlineatus , the cerebral cortex is electrically silent, yet the brainstem continues to regulate cardiorespiratory function. Previous work showed that neurons in slices through the medullary ventral respiratory column (VRC) but not the cortex are insensitive to high doses of pentobarbital during hibernation, leading to the hypothesis that GABAA receptors (GABAAR) in the VRC undergo a seasonal modification in subunit composition. To test whether alteration of GABAAR subunits are responsible for hibernation-associated pentobarbital insensitivity, we examined an array of subunits using RT-PCR and Western blots and identified changes in ε- and δ-subunits in the medulla but not the cortex. Using immunohistochemistry, we confirmed that during hibernation, the expression of ε-subunit-containing GABAARs nearly doubles in the VRC. We also identified a population of δ-subunit-containing GABAARs adjacent to the VRC that were differentially expressed during hibernation. As δ-subunit-containing GABAARs are particularly sensitive to ethanol (EtOH), multichannel electrodes were inserted in slices of medulla and cortex from hibernating squirrels and EtOH was applied. EtOH, which normally inhibits neuronal activity, excited VRC but not cortical neurons during hibernation. This excitation was prevented by bicuculline pretreatment, indicating the involvement of GABAARs. We propose that neuronal activity in the VRC during hibernation is unaffected by pentobarbital due to upregulation of ε-subunit-containing GABAARs on VRC neurons. Synaptic input from adjacent inhibitory interneurons that express δ-subunit-containing GABAARs is responsible for the excitatory effects of EtOH on VRC neurons during hibernation.

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