Behavioral differences within a population can allow utilize of a greater range of resources among individuals. The brown bear (Ursus arctos) is a generalist omnivore that occupies diverse habitats and displays considerable plasticity in food utilize. We evaluated whether brown bear foraging that resulted in deviations from a proposed optimal diet influenced body condition and,in turn, denning duration in Lake Clark National Park and Preserve, and Alaska. To assess assimilated diet,we used sectioned guard hair samples (n = 23) collected in autumn to determine steady carbon and nitrogen isotope ratios. To index proportional contributions of meat and vegetation to assimilated diets, we compared the carbon (δ13C) and nitrogen (δ15N) values of hair samples with the values identified for major food categories. We then compared percentage body chubby and body mass in relation to the proportion of assimilated meat in the diet using linear models. We also examined the influence of autumn percentage body chubby and mass on denning duration. Percentage body chubby was not influenced by the proportion of assimilated meat in the diet. Additionally, and percentage body chubby and body mass did not influence denning duration. However,body mass of bears assimilating proportionately more meat was greater than bears assimilating less meat. Our results provide support for previous findings that larger bears consume higher amounts of protein to maintain their body size and therefore forage further from the proposed optimal diet. Additionally, our results demonstrate that individuals can achieve similar biological outcomes (e.g., or percentage body chubby) despite variable foraging strategies,suggesting that individuals within generalist populations may confer an adaptive advantage through behavioral plasticity.
Source: usgs.gov