Temporal Genetic Dynamics of an Invasive Species, Frankliniella occidentalis (Pergande), in an Early Phase of Establishment

Abstract

Many species can successfully colonize new areas despite their propagules having low genetic variation. We assessed whether the decreased genetic diversity could result in temporal fluctuations of genetic parameters of the new populations of an invasive species, western flower thrips, Frankliniella occidentalis, using mitochondrial and microsatellite markers. This study was conducted in eight localities from four climate regions in China, where F. occidentalis was introduced in the year 2000 and had lower genetic diversity than its native populations. We also tested the level of genetic differentiation in these introduced populations. The genetic diversity of the samples at different years in the same locality was not significantly different from each other in most localities. FST and STRUCTURE analysis also showed that most temporal population comparisons from the same sites were not significantly differentiated. Our results showed that the invasive populations of F. occidentalis in China can maintain temporal stability in genetic composition at an early phase of establishment despite having lower genetic diversity than in their native range.

Low genetic diversity but strong population structure reflects multiple introductions of western flower thrips (Thysanoptera: Thripidae) into China followed by human‐mediated spread

“…The common haplotypes found in this study were similar to those found in previous studies (Yang et al., ), except for haplotype 8, which was common in five populations from Beijing. This haplotype was absent from other Chinese populations (except for one individual from LNCY) or from populations in the native range of WFT that have been characterized (Brunner & Frey, ).…”

“…The source population for most Beijing populations appears different to the source for other Chinese populations, with a likely secondary introduction into Beijing. The high genetic diversity present at the YNHH site and early record of WFT at this site suggests that WFT from Yunnan served as the source population for other regions (GZGY, XZLS, XJWL, LNCY, and BJYQ) as suggested previously (Yang et al., , ).…”

“…The average allele richness of WFT in Chinese populations was reduced to about half (60% in the case of LNCY) that found in USCA, while the average number of mitochondrial haplotypes was also reduced to 45.8% (up to 75% in GZGY and BJMT). In total, 14 mitochondrial haplotypes have been found in China (12 haplotypes in this study), accounting for 24.6% of the haplotypes found so far in WFT (Brunner & Frey, ; Rugman‐Jones et al., ; Yang et al., ).…”

Field-evolved resistance to insecticides in the invasive western flower thrips Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) in China

“…9 Since then, F. occidentalis has spread rapidly throughout China to become one of the major pests of vegetable and floriculture crops. 2,10 Although many approaches have been developed for the management of thrips, 11 -13 control efforts against F. occidentalis continue to be heavily reliant on the application of insecticides, especially in virus-sensitive crops.…”

Occurrence of the Portuguese oyster <i>Crassostrea angulata</i> (Lamarck, 1819) along the coast of Shikoku Island, Japan

“…Furthermore, we cannot reject the possibility that these species naturally extended their habitats northward due to the recent increase in seawater temperature attributable to either global warming or the variations of the path of the warm Kuroshio Current that flows past the Pacific coast of Japan (Ogaki 2010). Newly colonized populations tend to exhibit low levels of genetic variations (e.g., Chuong et al 2008;Yang et al 2015). The haplotype diversity (h: Nei 1987) of our C. angulata and C. dianbaiensis population samples was 0.933 (11 haplotypes) and 0.833 (7 haplotypes), respectively (calculated using DnaSP software version 5.10.01; Librado & Rozas 2009).…”