Out of Anatolia: Longitudinal gradients in genetic diversity support an eastern origin for a circum-Mediterranean oak gallwasp Andricus quercustozae

Antonis Rokas, Rachel J. Atkinson, Lucy M I Webster, G. Csóka, Graham N. Stone

Research output: Article

111 Citations (Scopus)

Abstract

Many studies have addressed the latitudinal gradients in intraspecific genetic diversity of European taxa generated during postglacial range expansion from southern refugia. Although Asia Minor is known to be a centre of diversity for many taxa, relatively few studies have considered its potential role as a Pleistocene refugium or a potential source for more ancient westward range expansion into Europe. Here we address these issues for an oak gallwasp, Andricus quercustozae (Hymenoptera: Cynipidae), whose distribution extends from Morocco along the northern coast of the Mediterranean through Turkey to Iran. We use sequence data for a fragment of the mitochondrial gene cytochrome b and allele frequency data for 12 polymorphic allozyme loci to answer the following questions: (1) which regions represent current centres of genetic diversity for A. quercustozae? Do eastern populations represent one refuge or several discrete glacial refugia? (2) Can we infer the timescale and sequence of the colonization processes linking current centres of diversity? Our results suggest that A. quercustozae was present in five distinct refugia (Iberia, Italy, the Balkans, southwestern Turkey and northeastern Turkey) with recent genetic exchange between Italy and Hungary. Genetic diversity is greatest in the Turkish refugia, suggesting that European populations are either (a) derived from Asia Minor, or (b) subject to more frequent population bottlenecks. Although Iberian populations show the lowest diversity for putatively selectively neutral markers, they have colonized a new oak host and represent a genetically and biologically discrete entity within the species.

Original languageEnglish
Pages (from-to)2153-2174
Number of pages22
JournalMolecular Ecology
Volume12
Issue number8
DOIs
Publication statusPublished - aug. 1 2003

Fingerprint

Andricus
longitudinal gradient
refugium
refuge habitats
Quercus
genetic variation
Turkey
Cytochromes b
center of diversity
Turkey (country)
Isoenzymes
range expansion
Coastal zones
Genes
Italy
Population
Balkan Peninsula
Cynipidae
Morocco
Hymenoptera

ASJC Scopus subject areas

  • Ecology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Out of Anatolia : Longitudinal gradients in genetic diversity support an eastern origin for a circum-Mediterranean oak gallwasp Andricus quercustozae. / Rokas, Antonis; Atkinson, Rachel J.; Webster, Lucy M I; Csóka, G.; Stone, Graham N.

In: Molecular Ecology, Vol. 12, No. 8, 01.08.2003, p. 2153-2174.

Research output: Article

Rokas, Antonis ; Atkinson, Rachel J. ; Webster, Lucy M I ; Csóka, G. ; Stone, Graham N. / Out of Anatolia : Longitudinal gradients in genetic diversity support an eastern origin for a circum-Mediterranean oak gallwasp Andricus quercustozae. In: Molecular Ecology. 2003 ; Vol. 12, No. 8. pp. 2153-2174.
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