Effects of Population Density and Pack Size on the Foraging Ecology of Gray Wolves

@article{Thurber1993EffectsOP,
  title={Effects of Population Density and Pack Size on the Foraging Ecology of Gray Wolves},
  author={Joanne M. Thurber and Rolf O. Peterson},
  journal={Journal of Mammalogy},
  year={1993},
  volume={74},
  pages={879-889}
}
A decline in the gray wolf ( Canis lupus ) population in Isle Royale National Park prompted an intensive study of radiocollared individuals in 1988–1991, complementing an ongoing study begun in 1958. During winter, 1959–1991, the proportion of lone wolves was higher when the population was at low levels, whereas average size of packs declined with density of wolves. Sizes of territories (1971–1991) were not related to size of packs. In winter, food availability (kg wolf−1 day−1) and kill… 
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References

SHOWING 1-10 OF 23 REFERENCES

The Rise and Fall of Isle Royale Wolves, 1975–1986

The wolf ( Canis lupus ) population in Isle Royale National Park, Michigan, increased steadily in the 1970s, reaching a peak of 50 wolves (91 wolves/1,000 km2) in 1980. A population crash followed in…

Numbers, Turnover, and Social Structure of the Isle Royale Wolf Population

Observations of wolves on Isle Royale are reported for 1961–66, with interpretations including the earlier 3-year period described by Mech (1966), where the alpha male of the large pack became lame and apparently was killed.

Wolf Predation on Wintering Deer in East-Central Ontario

Quantitative data on predation of white-tailed deer (Odocoileus virginianus) by wolves ( Canis lupus) in east-central Ontario were obtained by following a pack of eight wolves from January 11 to…

Solitary living and extraterritorial movements of wolves in relation to social status and prey abundance

Three factors encouraging wolf dispersal are examined: prey abundnance, age of the animals, and their sex, which are related to the frequency at which wolves dissociated from their packs and engaged in extraterritorial movements.

THE TIMBER WOLF IN THE ROCKY MOUNTAIN NATIONAL PARKS OF CANADA

The wolf (Canis lupus occidentalis) population of the Rocky Mountain National Parks of Canada, an area of 7000 square miles of mountainous terrain, was studied from 1943 to 1946. During that time it…

On the regulation of pack size in wolves.

  • E. Zimen
  • Environmental Science
    Zeitschrift fur Tierphysiologie, Tierernahrung und Futtermittelkunde
  • 1976
Based on a long-time study of the social behaviour of a wolf pack in a large enclosure, a model of the regulation of pack size is constructed.

Scent-marking in lone wolves and newly formed pairs

Conservation genetics of the endangered Isle Royale gray wolf

The small group of wolves on Isle Royale has been studiedfor over three decades as a model of the relationship between large carnivores and their prey. During the last ten years the population…

Ecological Determinants of Group Sizes of Foraging Lions

A number of authors have related ecological conditions to group size in birds and mammals to predict not only group sizes but sex ratios, sexual dimorphism, and mate-selection systems in response to resource distributions.

The role of dispersal in the population dynamics of snowshoe hares

The results are consistent with the hypothesis that food shortage is responsible for increased rates of dispersal at peak population densities at Kluane Lake, Yukon and the results are discussed in light of current hypotheses attempting to explain dispersal in cyclic small mammals.