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Medientyp:
E-Artikel
Titel:
Density Dependent Food Limitation and Maximal Production in Wild Reindeer Herds
Beteiligte:
Skogland, Terje
Erschienen:
The Wildlife Society, 1986
Erschienen in:The Journal of Wildlife Management
Sprache:
Englisch
ISSN:
0022-541X;
1937-2817
Entstehung:
Anmerkungen:
Beschreibung:
<p> Density dependent effects of food limitation on productivity have been documented for ≥12 species of large ungulates. In wild reindeer (Rangifer tarandus) a decrease in recruitment rate and adult female body size (although not in adult survival rate) develops in response to increasing population densities and is caused mainly by winter food limitation. This population response was used in modeling the maximum sustained yield (MSY) based on productivity curves in terms of annual biomass production/km<sup>2</sup>or numerical abundance. The fit of 2nd-order polynomials was used to test for nonlinearity in the relationship between density and dynamics. The production curves peaked close to 50% of the ecological carrying capacity (K), suggesting a response of the type theoretically predicted for large mammals, but the biomass production peaked at a lower population density. In management terms the 1st-order derivatives from the productivity equations indicated a MSY at 1.75 animals/km<sup>2</sup>of gross habitat, whereas numerical abundance peaked at 2.3. These results were shown for a population where winter range = total range × 0.12. </p>