Design and Analysis of Resource Selection Studies for Categorical Resource Variables

Alldredge, J. Richard; Griswold, James

doi:10.2193/0022-541x(2006)70[337:daaors]2.0.co;2

Cited by 61 publications

(40 citation statements)

References 66 publications

(114 reference statements)

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“…The null hypothesis was that wild boars randomly selected areas used or not by livestock in proportion to availability (Manly et al 1993). When the observed and expected use of areas differed significantly from that based on availability, we used Bonferroni's confidence intervals to detect significant selection or avoidance of areas by wild boar (Manly et al 1993;Alldredge and Griswold 2006). In addition, within livestock grazing areas, we distinguished between the areas used by cattle and those used by sheep.…”

Section: Resource Selection Analysismentioning

confidence: 99%

Does wild boar rooting affect livestock grazing areas in alpine grasslands?

Bueno

Barrio²,

García‐González³

et al. 2010

Eur J Wildl Res

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Interactions between traditional livestock management practices and wildlife activities are important in the conservation of many mountain ecosystems including the summer rangelands in the Spanish Central Pyrenees, where rooting by wild boar (Sus scrofa) is a large disturbance that can reduce the amount of area available to grazing livestock. This study explored the likely impact of wild boar rooting on Pyrenean grasslands. It quantified the extent of wild boar rooting in livestock grazing areas and determined whether wild boars selected or avoided areas depending on the type of livestock and stocking rates. Wild boar rooting affected 16% of livestock grazing area and occurred in sites that were grazed by cattle, rather than by sheep. In addition, a preference for areas that had intermediate stocking rates was found. The relationship between the increase in the number of wild boars and trends in livestock management suggests that the extent of wild boar rooting will increase especially in cattle grazing areas, and therefore, the area available for cattle grazing in Pyrenean mountain rangelands would decrease significantly.

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Section: Resource Selection Analysismentioning

confidence: 99%

Does wild boar rooting affect livestock grazing areas in alpine grasslands?

Bueno

Barrio²,

García‐González³

et al. 2010

Eur J Wildl Res

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“…This is partly due to the difficulty in meeting model assumptions of conventional selection analyses that rely on a spatially implicit framework to assess whether habitat use is nonrandom with respect to the available habitat (Manly et al 2002, Alldredge andGriswold 2006). For example, many conventional analyses require well-defined habitat categories within well-defined use areas at individual or population levels.…”

Section: Introductionmentioning

confidence: 99%

Modeling Loggerhead Turtle Movement in the Mediterranean: Importance of Body Size and Oceanography

Eckert

Moore

Dunn

et al. 2008

Ecological Applications

116

110

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Abstract. Adapting state-space models (SSMs) to telemetry data has been helpful for dealing with location error and for modeling animal movements. We used a combination of two hierarchical Bayesian SSMs to estimate movement pathways from Argos satellite-tag data for 15 juvenile loggerhead turtles (Caretta caretta) in the western Mediterranean Sea, and to probabilistically assign locations to one of two behavioral movement types and relate those behaviors to environmental features. A Monte Carlo procedure helped propagate location uncertainty from the first SSM into the estimation of behavioral states and environmentbehavior relationships in the second SSM. Turtles using oceanic habitats of the Balearic Sea (n ¼ 9 turtles) within the western Mediterranean were more likely to exhibit ''intensive search'' behavior as might occur during foraging, but only larger turtles responded to variations in seasurface height. This suggests that they were better able than smaller turtles to cue on environmental features that concentrate prey resources or were more dependent on highquality feeding areas. These findings stress the importance of individual heterogeneity in the analysis of movement behavior and, taken in concert with descriptive studies of Pacific loggerheads, suggest that directed movements toward patchy ephemeral resources may be a general property of larger juvenile loggerheads in different populations. We discovered sizebased variation in loggerhead distribution and documented use of the western Mediterranean Sea by turtles larger than previously thought to occur there. With one exception, only individuals .57 cm curved carapace length used the most westerly basin in the Mediterranean (western Albora´n Sea). These observations shed new light on loggerhead migration phenology.

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“…We used diagnostic statistics to examine the assumption of independence of model predictors and identify possible confounding factors (Alldredge and Griswold 2006). We assessed whether land-cover composition differed by site with chi-squared tests.…”

Section: Meso-scale Statistical Analysesmentioning

confidence: 99%