Infanticide as a male reproductive strategy has a nutritive risk effect in brown bears
Journal article, Peer reviewed
Data supplement: Model selection - Model selection procedure for fecal crude fiber (upper table) and fecal protein content in brown bear feces (adult males, lone females, and females with cubs-of-the-year), collected in Sweden in 2010. AICc = second-order bias-corrected Akaike’s Information Criteria value, ΔAICC = second-order bias-corrected Akaike’s Information Criteria model difference values, AICCW = second-order bias-corrected Akaike’s Information Criteria model model weight. + indicates whether or not a model term was included in the candidate model (100.9Kb)
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Original versionSteyaert S.M.J.G., Reusch C., Brunberg S., Swenson J.E., Hackländer K. & Zedrosser A. Infanticide as a male reproductive strategy has a nutritive risk effect in brown bears. Biology Letters. 2013(9): 20130624. http://dx.doi.org/10.1098/rsbl.2013.0624
Behavioural strategies to reduce predation risk can incur costs, which are often referred to as risk effects. A common strategy to avoid predation is spatio-temporal avoidance of predators, in which prey typically trade optimal resources for safety. Analogous with predator–prey theory, risk effects should also arise in species with sexually selected infanticide (SSI), in which females with dependent offspring avoid infanticidal males. SSI can be common in brown bear (Ursus arctos) populations and explains spatio-temporal segregation among reproductive classes. Here, we show that in a population with SSI, females with cubs-of-the-year had lower quality diets than conspecifics during the SSI high-risk period, the mating season. After the mating season, their diets were of similar quality to diets of their conspecifics. Our results suggest a nutritive risk effect of SSI, in which females with cubs-of-the-year alter their resource selection and trade optimal resources for offspring safety. Such risk effects can add to female costs of reproduction and may be widespread among species with SSI.