On Finding the Source of a Signal

Lenth, Russell V.

doi:10.1080/00401706.1981.10486257

Cited by 151 publications

(74 citation statements)

References 2 publications

(2 reference statements)

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“…We located radio-collared marten opportunistically with radiotelemetry daily to weekly from truck, snowmobile, aircraft, and on foot. Locations were determined using the Tukey maximum likelihood estimator (Lenth 1981) in the program Locate II (Nams 1990). To reduce the chance of placing marten in the wrong stand, we included a location in home range estimations only if the area of its 95% error ellipse was ,0.5 km 2 .…”

Section: Methodsmentioning

confidence: 99%

Habitat-Mediated Variation in Predation Risk by the American Marten

Andruskiw

Fryxell

Thompson

et al. 2008

Ecology

131

111

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The probability of prey encounter, attack, capture, and kill are often hypothesized to depend on habitat structure, but field evidence in terrestrial systems is rare. We tested whether predation efficiency by the American marten (Martes americana) and fear of predation by their primary prey, the red-backed vole (Clethrionomys gapperi), differed between 20- to 50-year-old regenerating forest stands and older uncut stands. Our results showed that the frequency of prey encounter, prey attack, and prey kill were higher in old uncut forests, despite the fact that small-mammal density was similar to that in younger logged forests. These differences in predation efficiency were linked to higher abundance of coarse woody debris, which seems to offer sensory cues to martens, thereby increasing the odds of hunting success. Red-backed voles in regenerating forest stands exhibited increased wariness compared to voles living in old uncut forest, suggestive of a behavioral response to habitat-mediated variation in predation risk.

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Section: Methodsmentioning

confidence: 99%

Habitat-Mediated Variation in Predation Risk by the American Marten

Andruskiw

Fryxell

Thompson

et al. 2008

Ecology

131

111

View full text Add to dashboard Cite

show abstract

“…We estimated locations using !2 bearings. We estimated locations and associated error polygons using the maximum likelihood estimator (Lenth 1981) in the software program LOCATE II (Nams 1990). For locations obtained with only 2 bearings, we attempted to maintain an angle of intersection near 908 to minimize error (White and Garrott 1990).…”

Section: Trapping and Radiotelemetrymentioning

confidence: 99%

Landscape Analysis of Bobcat Habitat in the Northern Lower Peninsula of Michigan

Preuss

Gehring

2007

J Wildl Manag

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Controversy over bobcat (Lynx rufus) management in the northern Lower Peninsula of Michigan (NLP), USA, stimulated a need for information on the distribution of Michigan bobcats. From March 2003 to October 2004, we conducted a radiotelemetry and scentstation survey study of bobcats in the NLP. We developed a spatial model to predict bobcat distribution throughout the NLP based on bobcat area requirements, habitat and landscape variables derived from remotely sensed land‐cover data, and a multivariate distance statistic. Bobcat 50% minimum convex polygon core areas were comprised of more lowland forest (51%), nonforested wetlands (9%), and streams (3%) than the surrounding NLP. The NLP was comprised primarily of upland forest (44%) and field (32%). Habitat in the northeast and central regions of the NLP was most similar to the habitat composition of bobcat core areas. This model will be useful in aiding Michigan wildlife management agencies with assessing the status and distribution of the NLP bobcat population by identifying areas important to bobcats and supporting the development of regional strategies for carnivore conservation.

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“…We estimated point locations for each female based on a maximum-likelihood estimator (Lenth 1981) with a bearing standard deviation of 38. We examined plots of estimated locations in the field on laptop computers and immediately discarded apparent erroneous bearings.…”

Section: Field Methodologymentioning

confidence: 99%

Habitat Use by Female Mallards in the Lower Mississippi Alluvial Valley

Davis

Afton

Cox³

2009

J Wildl Manag

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Mallard (Anas platyrhynchos) populations in the lower Mississippi Alluvial Valley (LMAV), USA, historically averaged 1.6 million and represented the largest concentrations of wintering mallards in North America. Effective management of this wintering population requires current information on use of habitats. Accordingly, we employed radiotelemetry techniques to assess proportional use of habitats by female mallards during winters 2004–2005 and 2005–2006. We divided winters into 4 time periods defined by hunting seasons (FIRST, SPLIT, SECOND, and POST) and recorded diurnal and nocturnal locations. We examined variations in proportional use of habitats and use of areas closed to hunting due to effects of age (immature or ad), winter (2004–2005 or 2005–2006), time period (SECOND or POST), individual female, and all potential interactions of these effects, using locations recorded during the latter 2 time periods. We found that diurnal and nocturnal proportional use of habitats varied inconsistently among time periods and winters. Mean proportional use of forested wetlands ranged from 0.475 to 0.816 and from 0.428 to 0.764 during diurnal and nocturnal sampling periods, respectively. Diurnal proportional use of areas closed to hunting varied inconsistently among time periods and winters. Mean proportional use of areas closed to hunting ranged from 0.183 to 0.423 during diurnal sampling periods. Nocturnal use of areas closed to hunting varied inconsistently among female ages and time periods and among female ages and winters. Mean proportional use of areas closed to hunting ranged from 0.211 to 0.445 during nocturnal sampling periods. Our research suggests that forested wetlands in the LMAV provide important wintering habitats for female mallards; continued restoration and establishment of these habitats should benefit female mallards.

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On Finding the Source of a Signal

Cited by 151 publications

References 2 publications

Habitat-Mediated Variation in Predation Risk by the American Marten

Habitat-Mediated Variation in Predation Risk by the American Marten

Landscape Analysis of Bobcat Habitat in the Northern Lower Peninsula of Michigan

Habitat Use by Female Mallards in the Lower Mississippi Alluvial Valley

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