Journal of Mathematical Biology

, Volume 32, Issue 4, pp 329–344 | Cite as

Population dynamic consequences of competition within and between age classes

  • R. M. Nisbet
  • L. C. Onyiah
Article

Abstract

We investigate the population dynamics of a semivoltine species whose juvenile development takes two years to complete, and is followed by a very short reproductive adult stage. Reproduction is synchronized so at any given time the juvenile population consists of two cohorts. Coexistence of the two cohorts requires that the strength of intea-cohort competition exceeds that of inter-cohort competition, an extension of the competitive exclusion principle. The population may exhibit population cycles with low integer period. We identify two mechanisms for two-year cycles, and note that four-year cycles are a natural consequence of overcompensation. Three year cycles can occur and we discuss the mechanisms involved.

Key words

Population dynamics Competition Age structure 

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • R. M. Nisbet
    • 1
  • L. C. Onyiah
    • 2
  1. 1.Department of Biological SciencesUniversity of CaliforniaSanta BarbaraUSA
  2. 2.Department of Mathematics and StatisticsNewcastle PolytechnicNewcastle upon TyneUK

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