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Density-Dependence in Single-Species Populations
M. P. Hassell
Journal of Animal Ecology
Vol. 44, No. 1 (Feb., 1975), pp. 283-295
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/3863
Page Count: 13
You can always find the topics here!Topics: Population density, Mortality, Insect larvae, Damping, Population growth rate, Population dynamics, Limit cycles, Adult insects, Contests, Population ecology
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(1) The general form of density-dependent relationships is discussed and illustrated with examples. These are compared with the relationships predicted from two other models for density-dependence. (2) A new model is proposed which has the properties that (1) at high population densities, the relationship between mortality, or natality (expressed as k-values), and the log density is characterized by a constant slope (b) and (2) the degree of density-dependence decreases as population density falls. (3) The stability properties of this model are discussed. A population may exhibit exponential damping, oscillatory damping, or stable limit cycle behaviour, depending upon the parameter (b) and the effective rate of increase of the population (lambda).
Journal of Animal Ecology © 1975 British Ecological Society