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Cytogenetic and molecular evidence for two species in the Anopheles barbirostris complex (Diptera: Culicidae) in Thailand

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Abstract

Seventeen isolines of Anopheles barbirostris derived from animal-biting female mosquitoes showed three karyotypic forms: Form A (X2, Y1) in five isolines from Phetchaburi province; Form B (X1, X3, Y2) in three and eight isolines from Chiang Mai and Ubon Ratchathani provinces, respectively; Form C (X2, Y3) in one isoline from Phetchaburi province. All 17 isolines exhibited an average branch summation of seta 2-VI pupal skins ranging from 12.1–13.0 branches, which was in the limit of A. barbirostris (6–18 branches). Of the 12 human-biting isolines from Chiang Mai province, five isolines showed Form B (X2, Y2), and seven isolines exhibited a new karyotypic form designated as Form E (X2, Y5). All of 12 isolines had an average branch summation of seta 2-VI pupal skins ranging from 22.4–24.5 branches, which was in the limit of Anopheles campestris (17–58 branches). Thus, they were tentatively designated as A. campestris-like Forms B and E. Hybridization between A. campestris-like Forms B and E showed that they were genetically compatible, yielding viable progeny for several generations suggesting conspecific relationships of these two karyotypic forms. Reproductive isolation among crosses between A. campestris-like Form B and A. barbirostris Forms A, B, and C strongly suggested the existence of these two species. In addition, the very low intraspecific variation (genetic distance <0.005) of the nucleotide sequence of ITS2 of the rDNA and COI and COII of mitochondrial DNA of the seven isolines of A. campestris-like Forms B and E supported their conspecific relationship. The large sequence divergence of ITS2 (0.203–0.268), COI (0.026–0.032), and COII (0.030–0.038) from genomic DNA of A. campestris-like Forms B and E and the A. barbirostris Forms A, B, and C clearly supported cytogenetic and morphological evidence.

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Acknowledgments

The authors sincerely thank the Biodiversity Research and Training Program (Grant No. BRT_249004) and the Thailand Research Fund through the Royal Golden Jubilee Ph.D Program (Grant No. PHD/0052/2548) for financially supporting this research project. We also thank Dr. Niwes Nantachit, Dean of the Faculty of Medicine, Chiang Mai University, for his interest in this research.

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Authors and Affiliations

  1. Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand

    Atiporn Saeung, Pradya Somboon, Benjawan Pitasawat, Benjawan Tuetun, Anuluck Junkum & Wej Choochote

  2. Department of Infectious Disease Control, Faculty of Medicine, Oita University, Hasama, Oita, 879-5593, Japan

    Yasushi Otsuka & Hiroyuki Takaoka

  3. Department of Biology and Center for Vectors and Vector-Borne Diseases, Faculty of Science, Mahidol University, Rama VI Road, Bangkok, 10400, Thailand

    Visut Baimai

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  1. Atiporn Saeung
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  2. Yasushi Otsuka
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  3. Visut Baimai
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  4. Pradya Somboon
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  5. Benjawan Pitasawat
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  9. Wej Choochote
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Correspondence to Wej Choochote.

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Saeung, A., Otsuka, Y., Baimai, V. et al. Cytogenetic and molecular evidence for two species in the Anopheles barbirostris complex (Diptera: Culicidae) in Thailand. Parasitol Res 101, 1337–1344 (2007). https://doi.org/10.1007/s00436-007-0645-1

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