Genetically differentiated races and speciation-with-gene-flow in the sunflower maggot, Strauzia longipennis

Andrew Forbes; Patrick Kelly; Kara Middleton; Marty Condon

doi:10.1007/s10682-012-9622-y

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Genetically differentiated races and speciation-with-gene-flow in the sunflower maggot, Strauzia longipennis

Journal article

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Genetically differentiated races and speciation-with-gene-flow in the sunflower maggot, Strauzia longipennis

Andrew Forbes, Patrick Kelly, Kara Middleton and Marty Condon

Evolutionary Ecology, Vol.27(5), pp.1017-1032

09/2013

DOI: 10.1007/s10682-012-9622-y

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Abstract

The ecological interactions parasitic insects have with their hosts may contribute to their prodigious diversity, which is unrivaled among animals. Many insects assumed to be polyphagous generalists have been shown to consist of several differentiated races, each occupying a different host-niche. The sunflower maggot fly, Strauzia longipennis, has long been thought to consist of two or more races due to its substantial intra-specific morphological variation. Here, we use nuclear and mitochondrial markers to test the hypothesis that S. longipennis is a complex of two or more partially reproductively isolated races. We collected S. longipennis flies as pupae from roots of Jerusalem artichoke (Helianthus tuberosus) and as adults swept from leaves of mature H. tuberosus across the breadth of a field season. Flies were scored for morphological variety (typica or vittigera), mitochondrial haplotype (A or B) and a panel of 176 AFLP loci. Bayesian clustering and neighbor-joining phylogenetic analyses of AFLP data supported the existence of at least three, possibly four, genetic races of Strauzia (clusters I, II, III, and V), as well as a small number of putative interracial hybrids (cluster IV). Clusters I and III each consisted of flies of both morphological varieties and both haplotype groups, while flies in cluster II were all of variety typica and all but one was of mitochondrial haplotype B. Flies in cluster II were also collected only as adults on H. tuberosus and not among flies reared from pupae collected from H. tuberosus roots, suggesting that they use a different plant as their larval host. Mean capture date was significantly different between flies of each genetic race, indicating that partial allochronic isolation may be one contemporary barrier to gene flow between races. Evidence that mitochondrial genomes and morphological traits have moved between lineages implies a model of speciation-with-gene-flow for S. longipennis races.

Life Sciences

Evolutionary Biology

Plant Sciences

Human Genetics

Helianthus tuberosus

Reproductive barriers

Speciation continuum

Incipient species

Mitochondrial introgression

Details

Title: Subtitle: Genetically differentiated races and speciation-with-gene-flow in the sunflower maggot, Strauzia longipennis
Creators: Andrew Forbes - Department of Biology The University of Iowa 434A Biology Building Iowa City IA 52242 USA
Patrick Kelly - Department of Biology The University of Iowa 434A Biology Building Iowa City IA 52242 USA
Kara Middleton - Department of Biology Cornell College Mount Vernon IA 52314-1098 USA
Marty Condon - Department of Biology Cornell College Mount Vernon IA 52314-1098 USA
Resource Type: Journal article
Publication Details: Evolutionary Ecology, Vol.27(5), pp.1017-1032
DOI: 10.1007/s10682-012-9622-y
ISSN: 0269-7653
eISSN: 1573-8477
Publisher: Springer Netherlands; Dordrecht
Language: English
Date published: 09/2013
Academic Unit: Biology
Record Identifier: 9983992083602771

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