Ecological Entomology (2007) 32, 643-650

Katsura Ito (2007)
Negative genetic correlation between diapause duration and fecundity after diapause in a spider mite
Ecological Entomology 32 (6), 643-650
Abstract: 1. Recently, the costs of diapause, i.e. the reduction of fecundity after diapause, have been examined from an evolutionary perspective.
2. The evolution of this trade-off should be clarified by quantitative genetic approaches, as theoretical studies address the evolution of multiple traits. Nevertheless, previous studies on the costs of diapause have been based on phenotypic correlations or experimental manipulations, whereas the genetic background underlying this trade-off remains unclear.
3. In the present study, a half-sib breeding design was used to examine the quantitative genetic relationships between diapause duration and post-diapause fecundity in the Kanzawa spider mite Tetranychus kanzawai Kishida (Acari: Tetranychidae).
4. The heritability of diapause duration, post-diapause total fecundity, and post-diapause early fecundity were 0.37, 0.14, and 0.11 respectively. Genetic correlations between diapause duration and post-diapause total fecundity, and between diapause duration and early fecundity were both significantly negative (-0.70 and -0.90 respectively). These results suggest that the cost of prolonging diapause duration is genetically based, and that these life-history traits respond to natural selection acting on them simultaneously.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Katsura Ito

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus kanzawai