The observed relationship between habitat selection and survival in E. blandingii indicates a direct link between behaviour (habitat selection) and fitness through mortality caused by predators and environmental stressors. “
“Department of Anatomy and Cell Biology, Oklahoma State University Center for Health Sciences, Tulsa, OK, USA Between hatching and late adulthood American alligators
Alligator mississippiensis show up to 7000-fold increases in body mass. Concurrent with selleck products such changes in body size are absolute and relative modifications in rostral proportions, dental form, feeding capacities and dietary preferences. How these major anatomical changes accommodate prey-resource shifts is poorly understood. In this study, we focus on the effects of ontogenetic changes in bite-force capacities and dental
form to address how these factors relate to tooth-pressure generation and diet. We derive absolute values of tooth pressure along the crowns of the most prominent teeth (the first documentation of tooth pressures throughout ontogeny and after initial tooth contact for any animal) and show that these pressures increase with positive allometry during ontogeny. In addition, we discuss how American alligator GW-572016 nmr tooth-pressure values explain their capacities for seizure and oral processing of typical prey, and how tooth-pressure changes facilitate developmental niche shifts in this large-bodied taxon. “
“The Eurasian lynx is an efficient stalking predator mainly selecting small-sized ungulates. In northern Scandinavia, semi-domestic reindeer are the only ungulate
species available for Eurasian lynx year round and consequently constitute their main prey. Selective predation patterns by a predator on a domestic prey are likely to be influenced by husbandry practices and may have consequences for harvest strategies. We used data on 795 lynx-killed reindeer from northern Scandinavia collected in 2008–2011 to determine whether male and female Eurasian pentoxifylline lynx preyed selectively on different age and sex classes of reindeer and how this was influenced by human-controlled seasonal changes in the composition of the reindeer herds. Lynx of both sexes were selected for reindeer calves year round although the proportions fluctuated seasonally, with peaks during summer and a drop after harvest. Male lynx switched to kill more adult reindeer in winter. There were no differences between the sexes of reindeer calves killed by lynx, but among adult reindeer male lynx selected for bulls over cows. We suggest that human-controlled seasonal variation in reindeer abundance is a main driver of prey selection by Eurasian lynx on semi-domestic reindeer. “
“Behavioral strategies of natal dispersers in response to human-altered habitat have far-reaching implications for functional connectivity and local population dynamics.