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Journal Article

Density-Dependence in Single-Species Populations

M. P. Hassell
Journal of Animal Ecology
Vol. 44, No. 1 (Feb., 1975), pp. 283-295
DOI: 10.2307/3863
Stable URL: http://www.jstor.org/stable/3863
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Density-Dependence in Single-Species
                            Populations
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Abstract

(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).

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