%0 Journal Article
%T Modeling the Influence of Forest Structure on Microsite Habitat Use by Snowshoe Hares
%A Angela K. Fuller
%A Daniel J. Harrison
%J International Journal of Forestry Research
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/892327
%X Snowshoe hare (Lepus americanus) is an important prey species for many Carnivora and has strong influences on community structure and function in northern forests. An understanding of within-stand (microsite) forest structural characteristics that promote high use by hares is important to provide forest management guidelines. We measured forest structural characteristics at the microsite-scale in north-central Maine and used an information-theoretic modeling approach to infer which characteristics were most strongly associated with use by hares during winter. We measured overwinter hare pellet density to model relationships among microsite-scale vegetation structure and hare use. Overwinter pellet density was positively associated with live stem cover (3 ¡Á coniferous saplings + deciduous saplings) and negatively associated with overstory canopy closure; the two variables explained 71% of the variation in microsite use by hares. The highest pellet densities were in grids with canopy closure <72% and stem cover units >22,000 stems/ha. Silvicultural practices that create dense areas of conifer and deciduous saplings should receive high within-stand use by hares in winter. These conditions can be achieved by promoting the release of advanced regeneration and reducing overstory cover to encourage establishment of shade-intolerant species; clearcutting is one such silvicultural prescription to achieve these conditions. 1. Introduction Snowshoe hare (Lepus americanus) have been reported to strongly influence community structure and function in northern boreal forests [1] and is an important prey species for many Carnivora including coyotes (Canis latrans) [2¨C4], fisher (Martes pennanti) [5, 6], American marten (Martes americana) [7¨C9], bobcat (Lynx rufus) [3], red fox [3, 10], and Canada lynx (Lynx canadensis) [11, 12]. Of special importance is the Canada lynx, which is designated as federally threatened in the lower 48 US [13] and is listed as provincially threatened (New Brunswick) or endangered (Nova Scotia) in some provinces of Eastern Canada. The lynx is a specialist on snowshoe hares [11, 12], and habitat use by lynx is closely associated with density of hares [4, 14¨C18]. Survival of snowshoe hares may be lower in forest stands with little understory cover [2, 19, 20], and overall survival depends on stand-specific hare density, presence of predators, and the hunting success of predators [21]. The refugium of hares from predation that is provided by dense stands is evident during the lows in the snowshoe hare cycle when the few surviving individuals
%U http://www.hindawi.com/journals/ijfr/2013/892327/