Journal
EXPERIMENTAL AND APPLIED ACAROLOGY
Volume 47, Issue 2, Pages 99-109Publisher
SPRINGER
DOI: 10.1007/s10493-008-9201-7
Keywords
Dispersal; Gene flow; Insecticide management; Microsatellite; Population structure; Tetranychus urticae
Categories
Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- 21st Century COE Program for Innovative Food and Environmental Studies Pioneered by Entomomimetic Sciences at Kyoto University
- Japan Society for the Promotion of Science [192238, 2007]
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The fine-scale genetic structure of Tetranychus urticae Koch was studied to estimate local gene flow within a rose tree habitat in a commercial greenhouse using seven microsatellite markers. Two beds of rose trees with different population densities were selected and 18 consecutive quadrats of 1.2 m length were sequentially established in each bed. Heterozygote deficiency was positive within quadrats, which was most likely a result of the Wahlund effect because the mites usually form small breeding colonies. Low population density and frequent inbreeding could also accelerate genetic differentiation among the breeding colonies. A short-range (2.4-3.6 m) positive autocorrelation and clear genetic cline among quadrat populations was detected within a bed. This suggests that gene flow was limited to a short range even if population density was substantially increased. Therefore, large-scale dispersal such as aerial dispersal contributed very little to gene flow in the greenhouse.
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