| Summary: | 碩士 === 國立中興大學 === 昆蟲學系所 === 101 === Invasive species are highly aggressive, and negatively effect on human economies and biodiversity. Successful biological invasions usually result from several evolutionary events that improve a species ability to survive in new habitats. The aim of this study is to quantify the roles of expansion route and environmental factors in the genetic variation of red import fire ant (Solenopsis invicta) in 16 cities of China by a novel analysis. We based on 211 S. invicta microsatellite data with 53 loci, and used Bayesian inference to calculate dissimilarity of environmental variables and expansion routes, and test relationships in expansion route, environmental factors and their interaction with the genetic variation of S. invicta. The deviance information coefficient weight (DIC weight) was used to select the best model. The importance of each factor in the best model was quantified by calculating the semi-partial R^2. Expansion route, environmental factors and their interaction all affected the genetic variation of S. invicta in China. Expansion route contributed more than environmental factors and their interaction (semi-partial R^2=0.37, 0.01 and 0.02, respectively). Different expansion routes increase the gene pool in China that increase the chance of variation. Environmental isolation explained very little of the genetic variation of S. invicta, indicating isolation-by-environmental contributed very little that environmental adaptations might not happen in China.
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