Hybridization in natural sympatric populations of Dermacentor ticks in northwestern North America.

Araya-Anchetta, A. and Scoles, G. A. and Giles, J. and Busch, J. D. and Wagner, D. M. (2013) Hybridization in natural sympatric populations of Dermacentor ticks in northwestern North America. Ecology and Evolution, 3 (3). pp. 714-724. ISSN 2045-7758

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Abstract

Hybridization in ticks has been described in a handful of species and mostly as a result of laboratory experiments. We used 148 AFLP loci to describe putative hybridization events between D. andersoni and D. variabilis in sympatric populations from northwestern North America. Recently, D. variabilis has expanded its range westward into the natural range of D. andersoni. Using a sample of 235 D. andersoni and 62 D. variabilis, we identified 31 individuals as putative hybrids: four F2 individuals and 27 backcrosses to D. andersoni (as defined by NewHybrids). We found no evidence of hybrids backcrossing into D. variabilis. Furthermore, all hybrids presented 16S mtDNA signatures characteristic of D. andersoni, which indicates the directionality of the hybrid crosses: female D. andersoni × male D. variabilis. We also discovered 13 species-specific AFLP fragments for D. andersoni. These loci were found to have a decreased occurrence in the putative hybrids and were absent altogether in D. variabilis samples. AFLP profiles were also used to determine the levels of genetic population structure and gene flow among nine populations of D. andersoni and three of D. variabilis. Genetic structure exists in both species (D. andersoni, ΦST = 0.110; D. variabilis, ΦST = 0.304) as well as significant estimates of isolation by distance (D. andersoni, ρ = 0.066, P = 0.001; D. variabilis, ρ = 0.729, P = 0.001).

Item Type:	Article
Publisher’s Statement:	Authors retain copyright. Creative Commons Attribution License.
ID number or DOI:	10.1002/ece3.496
Keywords:	boophilus-annulatus; Dermacentor andersoni; dna-sequence variation; D. variabilis; genetic-structure; Hybridization; hybrids; ixodes-pacificus acari; Ixodidae; lyme-disease; dermacentor andersoni; d. variabilis; Hybridization; Population Structure; ticks; population structure; population structure; Ribosomal DNA; seasonal activity; ticks; united-states
Subjects:	Q Science > QH Natural history Q Science > QL Zoology
Department/Unit:	Research Centers > Center for Microbial Genetics and Genomics
Date Deposited:	08 Oct 2015 17:37
URI:	http://openknowledge.nau.edu/id/eprint/664

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