title: DNA Barcode Analysis of Thrips (Thysanoptera) Diversity in Pakistan Reveals Cryptic Species Complexes.
abstract: Although thrips are globally important crop pests and vectors of viral disease, species identifications are difficult because of their small size and inconspicuous morphological differences. Sequence variation in the mitochondrial COI-5' (DNA barcode) region has proven effective for the identification of species in many groups of insect pests. We analyzed barcode sequence variation among 471 thrips from various plant hosts in north-central Pakistan. The Barcode Index Number (BIN) system assigned these sequences to 55 BINs, while the Automatic Barcode Gap Discovery detected 56 partitions, a count that coincided with the number of monophyletic lineages recognized by Neighbor-Joining analysis and Bayesian inference. Congeneric species showed an average of 19% sequence divergence (range = 5.6% - 27%) at COI, while intraspecific distances averaged 0.6% (range = 0.0% - 7.6%). BIN analysis suggested that all intraspecific divergence >3.0% actually involved a species complex. In fact, sequences for three major pest species (Haplothrips reuteri, Thrips palmi, Thrips tabaci), and one predatory thrips (Aeolothrips intermedius) showed deep intraspecific divergences, providing evidence that each is a cryptic species complex. The study compiles the first barcode reference library for the thrips of Pakistan, and examines global haplotype diversity in four important pest thrips.
authors.affiliation: National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.
authors.forename: Romana
authors.initials: R
authors.lastname: Iftikhar
authors.affiliation: National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.|Centre for Biodiversity Genomics, Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, Canada.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Ashfaq
authors.affiliation: National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.
authors.forename: Akhtar
authors.initials: A
authors.lastname: Rasool
authors.affiliation: Centre for Biodiversity Genomics, Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, Canada.
authors.forename: Paul D N
authors.initials: PD
authors.lastname: Hebert
mesh_terms: D000818:Animals; D001499:Bayes Theorem; D018556:Crops, Agricultural / Q000469:parasitology; D058893:DNA Barcoding, Taxonomic; D003576:Electron Transport Complex IV / Q000235:genetics*; D006239:Haplotypes; D019476:Insect Proteins / Q000235:genetics*; D024101:Mitochondrial Proteins / Q000235:genetics*; D005810:Multigene Family; D010154:Pakistan; D010802:Phylogeny; D061149:Thysanoptera / Q000145:classification / Q000235:genetics*
chemical_list: D019476:Insect Proteins; D024101:Mitochondrial Proteins; D003576:Electron Transport Complex IV