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Insectes Sociaux

, Volume 58, Issue 4, pp 445–452 | Cite as

Population structure of Apis cerana in Thailand reflects biogeography and current gene flow rather than Varroa mite association

  • O. RueppellEmail author
  • A. M. Hayes
  • N. Warrit
  • D. R. Smith
Research Article

Abstract

Concordance between the mitochondrial haplotypes of the Eastern honey bee, Apis cerana, and its ectoparasitic Varroa mites across the Isthmus of Kra in Thailand has suggested that local host–pathogen co-evolution may be responsible for the geographic distribution of particular genotypes. To investigate nuclear microsatellites population structure in A. cerana, single workers of A. cerana colonies from Thailand were genotyped at 18 microsatellite loci. The loci showed intermediate to high levels of heterozygosity and a range of allele numbers. The analyses confirmed a fundamental subdivision of the Thai A. cerana population into the “Asia Mainland” and “Sundaland” regions at the Isthmus of Kra. However, the nuclear microsatellite differentiation was less distinct than mtDNA haplotype differences, suggesting male-biased dispersal and population admixture. Overall, samples showed a weak isolation-by-distance effect. The isolated population on Samui island was most differentiated from the other samples. The results do not support our initial hypothesis of local host–pathogen co-evolution, which predicts a strict correspondence between the nuclear genome and the lineage of parasitic Varroa mite of the A. cerana samples, because the gene flow indicated by our nuclear microsatellite markers should also mix potential Varroa resistance alleles among subpopulations. Instead, our study suggests that the coincidental distribution of Varroa lineages and A. cerana population structure in Thailand are the result of biogeographic history and current migration patterns.

Keywords

Biogeography Co-evolution Local adaptation Microsatellites Population structure 

Notes

Acknowledgments

We would like to thank Stephen Brown for practical assistance in the lab. Members of the UNCG social insect lab and the North Carolina Honey Bee Research Consortium improved the study through many comments and discussions. The study was further improved by constructive criticisms by three anonymous reviewers and our editor. This study was financially supported by the National Science Foundation (#0615502) and USDA-NIFA (AFRI #2010-65-104-20533).

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Copyright information

© International Union for the Study of Social Insects (IUSSI) 2011

Authors and Affiliations

  • O. Rueppell
    • 1
    Email author
  • A. M. Hayes
    • 1
  • N. Warrit
    • 2
  • D. R. Smith
    • 3
  1. 1.Department of BiologyUniversity of North Carolina at GreensboroGreensboroUSA
  2. 2.Department of Biology, Faculty of SciencesChulalongkorn UniversityBangkokThailand
  3. 3.Department of Ecology and Evolutionary BiologyUniversity of KansasLawrenceUSA

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