| Autor: |
Shults, Phillip, Ho, Alphina, Martin, Estelle M, McGregor, Bethany L, Vargo, Edward L |
| Zdroj: |
Journal of Medical Entomology; July 2020, Vol. 57 Issue: 4 p1324-1327, 4p |
| Abstrakt: |
Much of the bluetongue (BT) and epizootic hemorrhagic disease (EHD) research in North America focuses on white-tail deer and Culicoides sonorensis(Wirth & Jones) (Diptera: Ceratopogonidae), though several other biting midge species have been suggested as vectors. Culicoides stellifer(Coquillett) has been associated with hosts susceptible to hemorrhagic disease (HD), and more recently, specimens from Florida have tested positive for EHD and BT viral RNA. If C. stelliferis acting as a vector, this could have an impact on the distribution of HD in North America. To determine if gene flow is occurring across the range of C. stelliferwithin the southeast United States, a mitochondrial haplotype analysis was performed using the COIgene. Our haplotype network showed no population structure in C. stelliferfrom Florida, Texas, and South Carolina, as the overall genetic divergence between these sites was equal to the genetic divergence within each. We also compared these haplotypes to published sequences of C. stellifercollected in Ontario, Canada. Surprisingly, the genetic diversity of the flies from Ontario was two times greater than what was observed between the southeast U.S. collection sites. This considerable divergence could be evidence of a cryptic species. A better understanding of the connectivity between C. stelliferpopulations across all of North America will give insight into the distribution of HD. Our results show that gene flow is occurring between sites in the southeastern United States and potentially throughout the eastern distribution of the species. |
| Databáze: |
Supplemental Index |
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