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Generation cycles, population cycles with a period of approximately one generation, have been observed in a variety of field and laboratory studies. Such dynamics are predicted to arise through the effects of resource competition and cannibalism or involve consumer-natural enemy interactions. We first show, using a new highly simplified model, that generation cycles are a very common outcome of strongly age-structured intraspecific interactions involving cannibalism. We then analyse a series of unique long-term time-series of ladybeetle (Coccinellidae) abundances from tropical Indonesia. Some of the time-series display clear generation cycles, and we argue that there is strong evidence that these are caused by intraspecific cannibalism.

Original publication

DOI

10.1098/rsbl.2004.0231

Type

Journal article

Journal

Proc Biol Sci

Publication Date

07/12/2004

Volume

271 Suppl 6

Pages

S501 - S504

Keywords

Animals, Cannibalism, Coleoptera, Competitive Behavior, Ecosystem, Indonesia, Models, Biological, Population Density, Population Dynamics, Time Factors