Biology thesis presentation by Robert Fridinger on Arctic Ground Squirrels Jan. 29

Friday, Jan. 29, 3:30 p.m.
ConocoPhillips Integrated Science Building, room 120

Robert Fridinger presents, "Active Season Changes in Resting Metabolic Rate and Body Condition of Free-Living Arctic Ground Squirrels" on Friday.

Abstract
The body mass and condition and resting metabolism of free-living arctic ground squirrels (AGS) were assessed. The deuterium dilution method of body condition estimation was calibrated for free-living AGS. AGS were at their lowest mass in the spring and increased before immergence. Lean mass (LM) increased between May and July and males continued to increase LM until August while female LM decreased prior to immergence. Lipid mass increased tenfold, and accounted for the majority of body mass increase. Fuel use shifted toward carbohydrate in the later active season. Resting metabolic rate (RMR) was at a seasonal low in spring, reached a mid-season maximum and decreased before immergence. RMR declined only after peak mass was attained, suggesting that RMR reduction is not important for the initiation of pre-hibernation fattening. RMR was modulated by the amount of LM present in males. Additionally, in females, nocturnal temperature reduction reduced energy expenditure before hibernation.

Parking is free on Fridays. No-host refreshments will be provided following the discussion for which your contributions are greatly appreciated.