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Genetic structure and demographic history of the melon fly Zeugodacus cucurbitae (Coquillet) (Diptera: Tephritidae) in Thailand

Kunprom, Chonticha, Pramual, Pairot
Agricultural and forest entomology 2018 v.20 no.2 pp. 180-190
fruits, haplotypes, host plants, glaciation, cytochrome-c oxidase, genetic drift, mitochondria, pests, population growth, genetic variation, vegetables, population structure, Zeugodacus cucurbitae, Thailand
The melon fly Zeugodacus cucurbitae (Coquillett) (Diptera: Tephritidae) is among the most economically important pests of fruits and fleshy vegetables. The genetic diversity, genetic structure and demographic history of Z. cucurbitae in Thailand were investigated based on mitochondrial cytochrome c oxidase I (COI) sequences. Low genetic variation was found in populations of Z. cucurbitae in Thailand, which is consistent with other studies of this species. Demographic history analysis detected a signal of population expansion dating back to 140 000 years ago, which possibly followed increases in host plants after climatic recovery of the penultimate Pleistocene glaciation. Population genetic structure analysis found that 51% of pairwise comparisons are genetically significantly different. Because populations that contributed markedly to genetic structuring possessed very low haplotype diversity, the effect of genetic drift could be a factor driving population differentiation. Comparisons of genetic differentiation between flies from different host plant species found no evidence of isolation. However, most haplotypes are unique for each host plant species, indicating that there are some degrees of isolation.