Population genetic structure of the oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) from Yunnan province (China) and nearby sites across the border

Abstract

Bactrocera dorsalis (Diptera: Tephritidae) is an important pest for many tropical and subtropical fruits. The fly is probably introduced in Yunnan, a southwestern province of China that shares borders with Vietnam, Laos and Myanmar. Depending on local environmental conditions, this species occurs either only in the most favorable seasons or year-round. To infer the genetic diversity and structure of the fly in the region, and to understand the relationships between the flies of year-round and seasonal areas, we analyzed 304 individuals from 14 populations using the mitochondrial cytochrome oxidase I gene (COI). The sampled populations were structured into four groups, probably isolated by the main natural barriers in Yunnan such as mountain ranges and rivers. Our data suggest either that B. dorsalis in Yunnan originated from multiple introductions events, even if the source populations still need to be identified; or that Yunnan is a natural origin of this species (i.e., that it is not invasive there). Finally, we found some evidences that the seasonal populations were colonized from nearby year-round populations.

Population genetic structure of the melon fly, Bactrocera cucurbitae (Coquillett) (Diptera: Tephritidae) based on mitochondrial cytochrome oxidase (COI) gene sequences

“…This study also supports the fact that B. cucurbitae populations are homogeneous irrespective of their geographical distribution as evident from very low intra-specific pair wise genetic distance. Contrary to this high intra-specific distances have also been reported for the other fruit flies (Mun et al 2003;Nardi et al 2005;Ochando and Reyes 2000;Shi et al 2005Shi et al , 2010. Based on studies of insect mtDNA, Brower (1994b) suggested that the molecular clock could be calibrated to 2.3 % pairwise sequence divergence per million years.…”

Population genetics and demographic history of guava fruit fly Bactrocera correcta (Diptera: Tephritidae) in northeastern Thailand

“…Several studies have shown that COI sequences can be used for population genetic studies of fruit flies (Mun et al, 2003;Nardi et al, 2005;Shi et al, 2005Shi et al, , 2010Shi et al, , 2012Hu et al, 2008;Prabhakar et al, 2012Prabhakar et al, , 2013Meeyen et al, 2014). We also investigated the genetic relationship between B. correcta in Thailand and samples from other geographic regions.…”

Genetic variations of Chrysomya megacephala populations in Malaysia (Diptera: Calliphoridae)

“…This grouping could be the result of the natural barrier afforded by Titiwangsa range as mentioned above. Natural barriers such as mountain ranges and rivers have also been reported to cause a similar population structure in the oriental fruit fly, Bactrocera dorsalis in Yunnan [42].…”