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1 Polish Journal of Ecology

1 2000

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Reaction of phenotypes of Tribolium castaneum (Herbst) and T. confusum (Duval) to changes in their diet

Prus T., Bijok P., Prus M.

Polish Journal of Ecology

2000

Vol. 48, nr 3

195-207

Comparison was made of reactions of two species: Tribolium castaneum (Herbst) - strain cl and T. confusum (Duval) - strain bIV and their two phenotypes characterised by different number of instars during development (6- and 7-instar) in each species to two diets: wheat flour with yeast (standard medium) and flour without yeast (altered medium). Medium deprived of yeast did not affect substantially survival of phenotypic groups of both species during embryonic and larval development. Lack of yeast in the diet significantly decreased fecundity (especially in T. castaneum), increased oxygen consumption mainly in larval stages, and increased body calorific value (stronger in T. confusum), decreased reproductive effort (stronger in T. castaneum). Lack of yeast in diet caused decrease in energy expenditure for maturation in T. confusum (with much smaller effect in T. castaneum). There was no significant difference in reaction to diet change in the two phenotypes within both strains.