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Shane Mahoney Conservation Visions


Shane Mahoney Conservation Visions

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Morphological change in Newfoundland caribou: Effects of abundance and climate

Rangifer
Author(s): 
Shane P. Mahoney, Jackie N. Weir, J. Glenn Luther, James A. Schaefer, & Shawn F. Morrison

The demographic and environmental influences on large mammal morphology are central questions in ecology. The authors investigated the effects of population abundance and climate on body size and number of male antler points for the La Poile and Middle Ridge caribou (Rangifer tarandus, L. 1758) herds, Newfoundland, Canada. Across 40 years and 20-fold changes in abundance, adult males and females exhibited diminished stature as indicated by jawbone size (diastema and total mandible length) and the number of antler points at the time of harvest.

Factors affecting the distribution and transmission of Elaphostrongylus rangiferi in caribou of Newfoundland, Canada

Canadian Journal of Zoology
Author(s): 
Mark C. Ball, Murray W. Lankester, and Shane P. Mahoney

Elaphostrongylus rangiferi was introduced to caribou (Rangifer tarandus caribou) of Newfoundland by infected reindeer (R. t. tarandus) from Norway and has caused at least two epizootics of cerebrospinal elaphostrongylosis (CSE), a debilitating neurologic disease. In an attempt to understand the conditions necessary for such outbreaks, the authors examined the effects of herd density and climatic factors on parasite abundance. The abundance of E.

Population decline in semi-migratory caribou (Rangifer tarandus)

intrinsic or extrinsic drivers?
NRC Research Press
Author(s): 
Guillaume Bastille-Rousseau, James A. Schaefer, Shane P. Mahoney, and Dennis L. Murray

Many populations of caribou (Rangifer tarandus (L., 1758)) across North America, including Newfoundland, are in a state of decline. This phenomenon may reflect contintental-scale changes in either the extrinsic or the intrinsic factors affecting caribou abundance. The authors hypothesized that caribou decline reflected marked resource limitation and predicted that fluctuations should correspond to time-delayed density dependence associated with a decline in range quality and decadal trends in winter severity.

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Spatial and temporal scaling of population density and animal movement

A power law approach
Ecoscience
Author(s): 
James A. Schaefer and Shane P. Mahoney

Many ecological patterns are sensitive to spatial and temporal scale, but no general protocol has emerged for dealing with scale-dependence. The authors suggest that power laws, regularly used in the study of body size, can be applied to many such features. The authors used these techniques to describe two scale-sensitive aspects of caribou (Rangifer tarandus): population densities of North American herds when measured at varying spatial extents, and speeds of radiotracked individuals when observed at varying temporal resolutions.

Spatial and Temporal Distributions of Moose-Vehicle Collisions in Newfoundland

Wildlife Society Bulletin
Author(s): 
Tammy L. Joyce and Shane P. Mahoney

In Newfoundland, 5,422 moose-vehicle collisions (MVCs) occurred between 1988 and 1994, resulting in 14 human and approximately 4,800 moose (Alces alces) fatalities. The authors examined daily, seasonal, and spatial distribution patterns of MVCs and used log-linear modeling to assess effects of darkness, posted speed limits, road condition, vehicle occupants, and road alignment on severity of human injury resulting from such collisions. Seventy-five percent of all MVCs occurred between dusk and dawn.

The relationship between weather and caribou productivity for the LaPoile Caribou Herd, Newfoundland

Rangifer
Author(s): 
Steven H. Ferguson and Shane P. Mahoney

To describe the relationship between weather and caribou (Rangifer tarandus) productivity, the authors compared weather variables (snow on ground, winter temperature and measures of growing season) with measures of productivity (calves seen by hunters, calves and yearlings in the harvest and percent calves and yearlings and pregnancy rate for caribou classified during fall and spring surveys) for the LaPoile Caribou Herd in southwestern Newfoundland. Hunter statistics reliably estimated changes in population demography.