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Titolo:
Mitochondrial DNA variation and GIS analysis confirm a secondary origin ofgeographical variation in the bushcricket Ephippiger ephippiger (Orthoptera : Tettigonioidea), and resurrect two subspecies
Autore:
Ritchie, MG; Kidd, DM; Gleason, JM;
Indirizzi:
Univ St Andrews, St Andrews KY16 9TS, Fife, Scotland Univ St Andrews St Andrews Fife Scotland KY16 9TS Y16 9TS, Fife, Scotland Univ Portsmouth, Dept Geog, Portsmouth PO1 3HE, Hants, England Univ Portsmouth Portsmouth Hants England PO1 3HE PO1 3HE, Hants, England
Titolo Testata:
MOLECULAR ECOLOGY
fascicolo: 3, volume: 10, anno: 2001,
pagine: 603 - 611
SICI:
0962-1083(200103)10:3<603:MDVAGA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
GENE FLOW; HYBRID ZONES; MEDITERRANEAN RAGWORT; POPULATION-STRUCTURE; SPECIATION; EVOLUTIONARY; ASTERACEAE; DIVERGENCE; EXPANSION; EUROPE;
Keywords:
genetic distance; GIS; geographical variation; hybrid zone; Mantel analysis; mtDNA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Ritchie, MG Univ St Andrews, Bute Med Bldg, St Andrews KY16 9TS, Fife, Scotland Univ St Andrews Bute Med Bldg St Andrews Fife Scotland KY16 9TS
Citazione:
M.G. Ritchie et al., "Mitochondrial DNA variation and GIS analysis confirm a secondary origin ofgeographical variation in the bushcricket Ephippiger ephippiger (Orthoptera : Tettigonioidea), and resurrect two subspecies", MOL ECOL, 10(3), 2001, pp. 603-611

Abstract

Geographic variation within species can originate through selection and drift in situ (primary variation) or from vicariant episodes (secondary variation). Most patterns of subspecific variation within European flora and fauna are thought to have secondary origins, reflecting isolation in refugia during Quaternary ice ages. The bushcricket Ephippiger ephippiger has an unusual pattern of geographical variability in morphology, behaviour and allozymes in southern France, which has been interpreted as reflecting recent primary origins rather than historical isolation. Re-analysis of this variation using Geographical Information Systems (GIS) suggests a possible zone ofhybridization within a complex pattern of geographical variation. Here we produce a genetic distance matrix from restriction fragment length polymorphism (RFLP) bandsharing of an approximately 4.5 kb fragment of mitochondrial DNA (mtDNA), and compare this with predictions resulting from the GIS analysis. The mtDNA variation supports a postglacial origin of geographical variation. Partial Mantel test comparisons of genetic distances with matricesof geographical distance, relevant environmental characteristics and possible refugia show refugia to be the best predictors of genetic distance. There is no evidence to support isolation by distance. However, environmental contrasts do explain significant variation in genetic distance after allowing for the effect of refugial origin. Also, a neighbour-joining tree has a major division separating eastern and western forms. We conclude that the major source of variation within the species is historical isolation in glacial refugia, but that dispersal, hybridization and selection associated with environmental features has influenced patterns of mtDNA introgression. Atleast two valid subspecies can be defined.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 12:06:12