Brown Bear Research - Rogers

 Determining the amino-acid specific diet-to-tissue discrimination factor and whisker growth rate in brown bears.

 The Environment and Natural Resources Institute, University of Alaska, Anchorage, Anchorage, AK, USA http://www.uaa.alaska.edu/enri 

Matt Rogers, Jeffrey Welker

Alaska Zoo, Anchorage, AK, USA

 In this work we will determine the amino-acid specific discrimination factor between the d13C and d15N values of dietary resources and those of blood and hair, two tissues commonly used in ecological examinations using stable isotopes.  In addition, we will determine the growth rates of bear hair.  Recently, the stable isotope values of sequential hair segments have been used to provide temporal information on dietary resource use.  However, without an accurate hair growth rate, we cannot accurately determine the temporal scale of dietary resource use provided by these tissues.