Evol Ecol Res 9: 1131-1143 (2007) Full PDF if your library subscribes.
Direct effects of larval competition on development time and fecundity in seed beetles
Steven M. Vamosi* and Terra L. Lesack
Department of Biological Sciences, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
Author to whom all correspondence should be addressed.
Question: Does larval intraspecific competition result in reduced mass-corrected fecundity independent of any effects on adult body mass?
Methods: We measured egg-to-adult developmental period, body mass, number of eggs laid, and longevity of female Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) reared alone or with another larva on cowpeas in climate-controlled growth chambers.
Results: Although the presence of a competitor did not affect mean mass of females at emergence, females reared with another larva laid significantly fewer eggs for a given body mass than those reared alone. Females that were reared in competition with another larva had longer developmental periods on average than those that were reared alone, whereas there was no evidence for an effect of competition on longevity.
Conclusions: Intraspecific competition can have direct negative effects on fecundity of females, and increase the length of the developmental period, without affecting body mass.
Keywords: Callosobruchus, development time, fecundity, intraspecific competition, longevity.
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