Détail de la notice
Titre du Document
Host-associated genetic differentiation in the goldenrod elliptical-gall moth, Gnorimoschema gallaesolidaginis (Lepidoptera: Gelechiidae)
Auteur(s)
NASON John D. ; HEARD Stephen B. ; WILLIAMS Frederick R.
Résumé
Careful study of apparently generalist phytophagous insects often reveals that they instead represent complexes of genetically differentiated host races or cryptic species. The goldenrod elliptical-gall moth, Gnorimoschema gallaesolidaginis, attacks two goldenrods in the Solidago canadensis complex: S. altissima and S. gigantea (Asteraceae). We tested for host-associated genetic differentiation in G. gallaesolidaginis via analysis of variation at 12 allozyme loci among larvae collected at six sites in Iowa, Minnesota, and Nebraska. Gnorimoschema gallaesolidaginis from each host are highly polymorphic (3.6-4.7 alleles/locus and expected heterozygosity 0.28-0.38 within site-host combinations). Although there were no fixed differences between larvae from S. altissima and S. gigantea at any site, these represent well differentiated host forms, with 11 of 12 loci showing significantly different allele frequencies between host-associated collections at one or more sites. Host plant has a larger effect on genetic structure among populations than does location (Wright's FST = 0.16 between host forms vs. FST = 0.061 and 0.026 among altissima and gigantea populations, respectively). The estimated FST between host forms suggests that the historical effective rate of gene flow has been low (Nem 1.3). Consistent with this historical estimate is the absence of detectable recombinant (hybrid and introgressant between host form) individuals in conte
Editeur
Blackwell
Identifiant
PMID : 12206247 ISSN : 0014-3820
Source
Evolution A. 2002, vol. 56, n° 7, pp. 1475-1488 [14 pages]
Langue
Anglais
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