The dynamics of laboratory populations ofCallosobruchus chinensis andC. Maculatus (Coleoptera: Bruchidae) in patchy environments |
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Authors: | M P Hassell V A Taylor and P M Reader |
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Institution: | (1) Department of Pure and Applied Biology, Imperial College, Silwood Park, SL5 7PY Ascot, Berks, UK |
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Abstract: | Summary Experiments are described showing the long-term dynamics of two species of bruchid beetles (Callosobruchus chinensis andC. maculatus) in arenas in which the resource of 50 black-eyed beans is divided between 5, 10 or 50 ‘patches’. Both species of adult beetles
exhibit clumped distributions between patches. Within a patch there is a tendency for a density dependent reduction in (1)
eggs laid per female, (2) the proportion of eggs hatching per bean (C. chinensis only) and (3) larval survival which is strongly overcompensating (particularly inC. maculatus). A discrete generation model is used as a framework to draw these results together and show how the different factors affecting
natality and mortality can influence the population dynamics. Finally, the importance of the resource renewal interval in
influencing the period of the population cycles is discussed. |
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