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Black Bear (Ursus Americanus) Functional Resource Selection Relative to Intraspecific Competition and Human Risk Jared F

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Black Bear (Ursus Americanus) Functional Resource Selection Relative to Intraspecific Competition and Human Risk Jared F 203 ARTICLE Black bear (Ursus americanus) functional resource selection relative to intraspecific competition and human risk Jared F. Duquette, Jerrold L. Belant, Clay M. Wilton, Nicholas Fowler, Brittany W. Waller, Dean E. Beyer, Jr., Nathan J. Svoboda, Stephanie L. Simek, and Jeff Beringer Abstract: The spatial scales at which animals make behavioral trade-offs is assumed to relate to the scales at which factors most limiting resources and increasing mortality risk occur. We used global positioning system collar locations of 29 reproductive-age female black bears (Ursus americanus Pallas, 1780) in three states to assess resource selection relative to bear population-specific density, an index of vegetation productivity, riparian corridors, or two road classes of and within home ranges during spring– summer of 2009–2013. Female resource selection was best explained by functional responses to vegetation productivity across nearly all populations and spatial scales, which appeared to be influenced by variation in bear density (i.e., intraspecific competition). Behavioral trade-offs were greatest at the landscape scale, but except for vegetation productivity, were consistent for populations across spatial scales. Females across populations selected locations nearer to tertiary roads, but females in Michigan and Mississippi selected main roads and avoided riparian corridors, whereas females in Missouri did the opposite, suggesting population-level trade-offs between resource (e.g., food) acquisition and mortality risks (e.g., vehicle collisions). Our study emphasizes that female bear population-level resource selection can be influenced by multiple spatially dependent factors, and that scale-dependent functional behavior should be identified for management of bears across their range. Key words: black bear, food, hunting, mixed models, riparian, roads, Ursus americanus. Résumé : Il est présumé que les échelles spatiales auxquelles les animaux font des compromis comportementaux sont reliées aux échelles auxquelles se manifestent les facteurs qui limitent le plus les ressources et accroissent le plus le risque de mortalité. Nous utilisons des emplacements obtenus par colliers GPS de 29 ours noirs (Ursus americanus Pallas, 1780) en âge de procréer dans trois États pour évaluer la sélection des ressources par rapport a` la densité de la population d’ours, a` un indice de la productivité de la végétation, aux corridors rivulaires ou a` deux classes de routes associés dans les domaines vitaux durant les printemps et étés de 2009 a` 2013. La sélection des ressources par les femelles s’expliquait le mieux par des réponses fonctionnelles a` la productivité de la végétation pour presque toutes les populations et échelles spatiales, qui semblaient être influencées par des variations de la densité d’ours (c.-a`-d., concurrence intraspécifique). Les compromis comportementaux étaient les plus grands a` For personal use only. l’échelle du paysage, mais, a` l’exception de la productivité de la végétation, étaient cohérents pour les populations a` toutes les échelles. Les femelles de différentes populations choisissaient des emplacements plus proches de routes tertiaires, mais les femelles au Michigan et au Mississippi choisissaient des routes principales et évitaient les corridors rivulaires, alors que les femelles aux Missouri faisaient le contraire, indiquant des compromis au niveau de la population entre l’acquisition des ressources (p. ex. de la nourriture) et les risques de mortalité (p. ex. collisions avec des véhicules). L’étude souligne le fait que la sélection des ressources par les ourses au niveau de la population peut être influencée par différents facteurs dépendants de l’emplacement et que la gestion des ours dans l’ensemble de leur aire de répartition requiert une connaissance des comporte- ments fonctionnels dépendants de l’échelle. [Traduit par la Rédaction] Mots-clés : ours noir, nourriture, chasse, modèles mixtes, rivulaire, routes, Ursus americanus. Introduction can vary across landscapes (Johnson and Seip 2008). Imperfect knowledge or cues to resource availability or quality can also limit Animals improve their reproductive success by selecting the resource accessibility (Basille et al. 2013). Therefore, animals im- most beneficial resources available across a landscape (Rettie and prove their reproductive success by using behavioral trade-offs Messier 2000; Manly et al. 2002). But resources may be limited by between resource selection and mortality risk avoidance (Martin factors including habitat fragmentation (e.g., roads: Shepherd and et al. 2010; Latif et al. 2011). Whittington 2006; land-use change: Hiller and Belant 2015; Hiller The spatial scales at which animals adapt their behavior are Can. J. Zool. Downloaded from www.nrcresearchpress.com by MISSISSIPPI STATE UNIV LIB on 03/06/17 et al. 2015), intra- and inter-specific competition (Ciarniello et al. generally assumed to relate to the scales where access to resources 2007; Watts and Holekamp 2009), or direct and indirect mortality is maximized and mortality risk is minimized (Rettie and Messier risks (Creel et al. 2008; Steyaert et al. 2013; Kiffner et al. 2014) that 2000). A factor (e.g., predation risk) that limits resources and in- Received 9 February 2016. Accepted 9 December 2016. J.F. Duquette,* J.L. Belant, C.M. Wilton, N. Fowler, B.W. Waller, N.J. Svoboda, and S.L. Simek. Carnivore Ecology Laboratory, Forest and Wildlife Research Center, Mississippi State University, Mississippi State, MS 39762, USA. D.E. Beyer, Jr. Michigan Department of Natural Resources, Wildlife Division, Marquette, MI 49855, USA. J. Beringer. Missouri Department of Conservation, Columbia, MO 65201, USA. Corresponding author: Jared F. Duquette (email: [email protected]). *Present address: Illinois Natural History Survey, 1816 South Oak Street, Champaign, IL 61820, USA. Copyright remains with the author(s) or their institution(s). Permission for reuse (free in most cases) can be obtained from RightsLink. Can. J. Zool. 95: 203–212 (2017) dx.doi.org/10.1139/cjz-2016-0031 Published at www.nrcresearchpress.com/cjz on 1 February 2017. 204 Can. J. Zool. Vol. 95, 2017 creases mortality risk modifies animal behavior at successively bears by introducing mortality risks (e.g., vehicle collisions) and finer scales until another factor (e.g., food) becomes more limiting fragmenting resources across the landscape (Reynolds-Hogland and further modifies behavior. Intraspecific population density and Mitchell 2007; Waller et al. 2014). Anthropogenic mortality can be a major factor influencing the behavioral trade-offs of risk may especially influence resource selection of adult females animals because intraspecific competition increases with popula- with dependent young while meeting increased nutritional de- tion density (e.g., Ciarniello et al. 2007). Greater intraspecific com- mands and avoiding vehicles (Wilton et al. 2014a), hunters petition can decrease the availability of ideal resources and limit (Reynolds-Hogland and Mitchell 2007), or intra-specific predation animal fitness (Zedrosser et al. 2006; van Beest et al. 2014). Al- (LeCount 1987; Garrison et al. 2007). An assessment of resource though identifying factors that influence the behavioral trade-offs selection and mortality risk trade-offs of reproductive-aged female of animals across multiple spatial scales is common (e.g., Basille black bears may therefore reveal factors that limit population-level et al. 2013), generalizing those conclusions across the geographic fitness (Mitchell and Powell 2007). Although numerous aspects of range of a species can introduce bias from variability in biological black bear resource selection relative to mortality risks have been and environmental factors found within each population. Assess- reported for individual populations (e.g., Belant et al. 2010; Waller ing behavioral trade-offs among population density, resource se- et al. 2014), little is known about bear trade-offs between re- lection, and mortality risks within and across populations could sources and mortality risks across populations with varying pop- provide insights into factors affecting the range-wide reproduc- ulation density and environmental characteristics. tive success of a species (McLoughlin et al. 2000; Bojarska and Our objective was to assess reproductive-aged female black bear Selva 2012). resource selection relative to variation in population density, veg- Animals maximize their fitness by adapting to environmental etation productivity, riparian corridors, and two classes of roads variability in a functional nonlinear manner (Matthiopoulos et al. of and within home ranges during spring–summer for popula- 2011), often at multiple spatial scales (Moreau et al. 2012). For tions along a latitudinal gradient of the United States. We focused example, animals living in landscapes with patchy and fluctuat- on reproductive-aged females because this demographic is likely ing food resources and mortality risks may functionally select sensitive to behavioral trade-offs between resources and mortality habitat patches based on a trade-off between perceived resources risks (Martin et al. 2010) while maintaining nutritional condi- and mortality risks (Godvik et al. 2009; Moreau et al. 2012). This tion for reproductive success (Elowe and Dodge 1989; Dahle and concept can be extended to variability in other factors, such as Swenson 2003; Ayers et al. 2013). We established four hypotheses resource competition and anthropogenic disturbance, which di- related
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