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3 Polish Journal of Ecology

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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.

Response of stored product pest life strategy to chemical treatment : effect of tricalcium phosphate (TCP) on Tribolium strains (T.castaneum herbst and T. confusum Duval)

Prus M.

Polish Journal of Ecology

1998

Vol. 46, no 1

13-22

The experiments were carried out on two strains: cl of Tribolium castaneum (Hbst.) and bIV of T. confusum Duval. in medium enriched by yeast using tricalcium phosphate (TCP) as the controling factor. Within these two species two groups of 6- and 7- instar individuals were discerned. The developmental time and survival of T. confusum population is depressed stronger than those of T. castaneum. There are no differences between 6- and 7-instar groups in response to various concentration of TCP. The results obtained for fecundity showed that this trait is more restricted in T. castaneum than in T. confusum. Hatchability in all experiments was similar.

Intrapopulation differentiation in black mutants of tribolium

Prus T.

Polish Journal of Ecology

1998

Vol. 46, no 1

5-12

The studies were carried out on black mutants distinguished as Tribolium castaneum "sooty" and T.confusum "ebony-2" both considered as recessive for blackness.The studies aimed at finding the phenotypic differentiation into 6- and 7-instar groups which were actually observed in both the strains, however at different proportions: 1 to 4 in T. castaneum "sooty" and 1 to 15 in T. confusum "ebony-2". The discerned instar groups differed in length of development and maximum larval weight.