Bruno M D Tran    

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Selected publications - Tran & Credland, 1995

Biological Journal of the Linnean Society (1995), 56: 483503. With 2 figures

Consequences of inbreeding for the cowpea seed beetle, Callosobruchus maculatus (F.)(Coleoptera: Bruchidae)

Bruno M. D. Tran and Peter F. Credland

Division of Biology, School of Biological Sciences, Royal Holloway, University of London, Egham Hill, Egham, Surrey, TW20 0EX

Received 26 September 1994; accepted for publication 4 May 1995

Inbreeding is said to reduce vigour and fitness. It may also determine how a population responds to selection. Local populations of Callosobruchus maculatus, the cowpea seed beetle, are established annually from small numbers of founders and the species has been distributed to many parts of the world where isolated populations may have been founded by very small numbers of individuals. After more than 20 generations of inbreeding, inbred lines have been shown to diverge from a common ancestral stock in similar directions with respect of some variables such as developmental speed, but haphazardly in respect of other parameters such as male weight. The respective roles of drift and of selection as effective evolutionary forces in inbred lines are discussed in the light of these results. It is argued that some intraspecific differences in C. maculatus may be explained as a product of periodic inbreeding, but that the process does not impair the ability to adapt to local conditions so contributing to the status of the species as a pest of international importance. 1995 The Linnean Society of London

ADDITIONAL KEY WORDS:*Inbreeding Callosobruchus maculatus Coleoptera Bruchidae stored products pests life history evolution phenotypic variation fitness components selection.

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      Last modified:
12 March 2006