Molecular phylogeny and evolution of host‐plant use in conifer seed chalcids in the genus Megastigmus (Hymenoptera: Torymidae)
Identifieur interne : 001147 ( Istex/Curation ); précédent : 001146; suivant : 001148Molecular phylogeny and evolution of host‐plant use in conifer seed chalcids in the genus Megastigmus (Hymenoptera: Torymidae)
Auteurs : Marie-Anne Auger-Rozenberg [France] ; Carole Kerdelhué ; Emmanuelle Magnoux ; Jean Turgeon [Canada] ; Jean-Yves Rasplus [France] ; Alain RoquesSource :
- Systematic Entomology [ 0307-6970 ] ; 2006-01.
Abstract
Abstract. Phylogenetic relationships amongst Megastigmus species (Chalcidoidea: Torymidae) associated with conifer seeds were inferred from DNA sequence data. Twenty‐nine species of seed chalcids were analysed using two different genes, cytochrome b (mitochondrial DNA) and the D2 domain of the 28S ribosomal DNA. Maximum‐parsimony and maximum‐likelihood analyses showed that taxa formed two monophyletic groups, one clade comprising all species associated with Cupressaceae and Taxodiaceae hosts with the exception of Chamaecyparis, and the other clade composed of species associated with Pinaceae. Species infesting Cupressaceae and Taxodiaceae seemed to be specialized to particular host genera or even to be species specific, which was consistent with a taxonomic radiation following initial host adaptation. By contrast, Megastigmus species associated with Pinaceae appeared capable of shifting onto different congeneric species or even onto a new host genus, with their evolution apparently less constrained by plant association. We hypothesized that the Megastigmus group associated with Pinaceae may have a much higher invasive potential than that related to Cupressaceae. The study also confirmed the presence of invasive Nearctic species in the Palaearctic, and demonstrated the existence of a cryptic species complex.
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DOI: 10.1111/j.1365-3113.2005.00310.x
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Carole Kerdelhué<affiliation><mods:affiliation>INRA, Unité de Zoologie Forestière, Ardon, Olivet, France,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation><affiliation><mods:affiliation>INRA, Unité de Zoologie Forestière, Ardon, Olivet, France,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation><affiliation><mods:affiliation>INRA, Unité de Zoologie Forestière, Ardon, Olivet, France,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation>Le document en format XML
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wicri:rule="url">France</country></affiliation></author><author><name sortKey="Kerdelhue, Carole" sort="Kerdelhue, Carole" uniqKey="Kerdelhue C" first="Carole" last="Kerdelhué">Carole Kerdelhué</name><affiliation><mods:affiliation>INRA, Unité de Zoologie Forestière, Ardon, Olivet, France,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation></author><author><name sortKey="Magnoux, Emmanuelle" sort="Magnoux, Emmanuelle" uniqKey="Magnoux E" first="Emmanuelle" last="Magnoux">Emmanuelle Magnoux</name><affiliation><mods:affiliation>INRA, Unité de Zoologie Forestière, Ardon, Olivet, France,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation></author><author><name sortKey="Turgeon, Jean" sort="Turgeon, Jean" uniqKey="Turgeon J" first="Jean" last="Turgeon">Jean Turgeon</name><affiliation wicri:level="1"><mods:affiliation>Natural Resources Canada – Canadian Forest Service, Great Lakes Forestry Centre, Ontario, Canada 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code="subField"></wicri:noCountry></affiliation></author></analytic><monogr></monogr><series><title level="j">Systematic Entomology</title><idno type="ISSN">0307-6970</idno><idno type="eISSN">1365-3113</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK; Malden, USA</pubPlace><date type="published" when="2006-01">2006-01</date><biblScope unit="volume">31</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="47">47</biblScope><biblScope unit="page" to="64">64</biblScope></imprint><idno type="ISSN">0307-6970</idno></series><idno type="istex">A9F14EDE7E87E31AB8B68B3002D0FE1D644C66E9</idno><idno type="DOI">10.1111/j.1365-3113.2005.00310.x</idno><idno type="ArticleID">SYEN310</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0307-6970</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Abstract. Phylogenetic relationships amongst Megastigmus species (Chalcidoidea: Torymidae) associated with conifer seeds were inferred from DNA sequence data. Twenty‐nine species of seed chalcids were analysed using two different genes, cytochrome b (mitochondrial DNA) and the D2 domain of the 28S ribosomal DNA. Maximum‐parsimony and maximum‐likelihood analyses showed that taxa formed two monophyletic groups, one clade comprising all species associated with Cupressaceae and Taxodiaceae hosts with the exception of Chamaecyparis, and the other clade composed of species associated with Pinaceae. Species infesting Cupressaceae and Taxodiaceae seemed to be specialized to particular host genera or even to be species specific, which was consistent with a taxonomic radiation following initial host adaptation. By contrast, Megastigmus species associated with Pinaceae appeared capable of shifting onto different congeneric species or even onto a new host genus, with their evolution apparently less constrained by plant association. We hypothesized that the Megastigmus group associated with Pinaceae may have a much higher invasive potential than that related to Cupressaceae. The study also confirmed the presence of invasive Nearctic species in the Palaearctic, and demonstrated the existence of a cryptic species complex.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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