title: Variation in the life history pattern of Tetranychus urticae (Acari: Tetranychidae) after selection for dispersal.
abstract: The spider mite Tetranychus urticae shows variation in its dispersal capacity (i.e., the leaf quality at which a female decides to disperse). We were able to artificially select mites that had either a high or a low dispersal capacity, indicating that this trait was genetically controlled. We then compared correlated responses to this selection. Mites with a genetically high dispersal capacity ('HD' strains) had a higher diapause incidence and a lower performance compared to mites with a low dispersal capacity ('LD' strains). A possible effect of random genetic drift during the selection was negligible. Our results suggest that differential dispersal capacity is associated with contrasting life history patterns as a result of natural selection.
authors.affiliation: Laboratory of Ecological Information, Graduate School ofAgriculture, Kyoto University Sakyo-ku, Kyoto 606-8502, Japan. yano@kais.kyoto-u.ac.jp
authors.forename: Shuichi
authors.initials: S
authors.lastname: Yano
authors.forename: Akio
authors.initials: A
authors.lastname: Takafuji
mesh_terms: D000818:Animals; D007887:Fabaceae / Q000469:parasitology; D005260:Female; D008297:Male; D010058:Oviposition / Q000502:physiology; D018515:Plant Leaves; D012641:Selection, Genetic; D012744:Sex Ratio; D040102:Tetranychidae / Q000254:growth & development / Q000502:physiology*