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EFFECTS OF MATERNAL DENSITY AND AGE ON THE DAILY FECUNDITY AND OFFSPRING SEX RATIO IN TETRANYCHUS URTICAE KOCH

Published online by Cambridge University Press:  31 May 2012

S.Y. Li  and
R. Harmsen
S.Y. Li
Affiliation:
Biology Department, Queen's University, Kingston, Ontario, Canada K7L 3N6
R. Harmsen
Affiliation:
Biology Department, Queen's University, Kingston, Ontario, Canada K7L 3N6
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Extract

The two-spotted spider mite, Tetranychus urticae Koch, is an arrhenotokous species (Helle and Bolland 1967). Mated females produce both male and female offspring; unmated females produce only sons. Although there is no “normal” sex ratio for spider mites, a ratio of one male to approximately three females is often found in many tetranychid species (Wrensch 1985). The exact mechanism of the female-biased sex ratio is not fully understood, but previous studies have demonstrated several factors affecting the sex ratio in spider mites. In this report, we analyze the effects of maternal density, age, and the interaction between these factors on female daily fecundity and offspring sex ratio in T. urticae.

Type
Articles
Information
The Canadian Entomologist , Volume 125 , Issue 3 , June 1993 , pp. 633 - 635
Copyright
Copyright © Entomological Society of Canada 1993

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