SELECTION AND DISPERSAL IN A MULTISPECIES OAK HYBRID ZONE
Identifieur interne : 000153 ( France/Analysis ); précédent : 000152; suivant : 000154SELECTION AND DISPERSAL IN A MULTISPECIES OAK HYBRID ZONE
Auteurs : Richard S. Dodd [États-Unis] ; Zara Afzal-Rafii [France]Source :
- Evolution [ 0014-3820 ] ; 2004-02.
Descripteurs français
- Wicri :
- topic : Climat.
English descriptors
Abstract
Abstract The four western North American red oak species (Quercus wislizeni, Q. parvula, Q. agrifolia, and Q. kelloggii) are known to produce hybrid products in all interspecific combinations. However, it is unknown whether hybrids are transitory resulting from interspecific gene flow or whether they are maintained through extrinsic selection. Here, we examine cryptic hybrid structure in Q. wislizeni through a broad region including contact and isolation from three other western North American red oaks using amplified fragment length polymorphism molecular markers. All four species were simultaneously detected in the genetic background of individuals morphologically assigned to Q. wislizeni, although the contribution of Q. kelloggii was minor. In some cases, introgression was detected well outside the region of sympatry with one of the parental species. Molecular structure at the individual level indicated this was due to long‐distance pollen dispersal and not to local extinction of parental species. Species admixture proportions were correlated with climatic variables and greater proportions of Q. agrifolia and Q. parvula were present in the genetic background of Q. wislizeni in sites with cooler and more humid summers, corresponding with habitat preferences of the parental species. Partial Mantel tests indicated that climate was more important than distance from pollen source in this association. Despite high levels of introgression, species integrity was maintained in some populations in close proximity to the other species, providing further support to environmental selection in determining population genetic structure. Thus, the contribution of species mixtures to population genetic structure varies across the landscape according to availability of pollen, but more importantly to varying environmental selection pressures that produce a complex pattern of hybrid and pure gene pools.
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DOI: 10.1111/j.0014-3820.2004.tb01643.x
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Dodd</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Californie</region></placeName><wicri:cityArea>Department of Environmental Science Policy and Management, University of California, 145 Mulford Hall, Berkeley</wicri:cityArea></affiliation></author><author><name sortKey="Afzal Afii, Zara" sort="Afzal Afii, Zara" uniqKey="Afzal Afii Z" first="Zara" last="Afzal-Rafii">Zara Afzal-Rafii</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>IMEP, Faculté des Sciences St. Jérôme, Université d'Aix‐Marseille III, 13397 Marseille</wicri:regionArea><placeName><region type="region" nuts="2">Provence-Alpes-Côte d'Azur</region><settlement type="city">Marseille</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Evolution</title><idno type="ISSN">0014-3820</idno><idno type="eISSN">1558-5646</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2004-02">2004-02</date><biblScope unit="volume">58</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="261">261</biblScope><biblScope unit="page" to="269">269</biblScope></imprint><idno type="ISSN">0014-3820</idno></series><idno type="istex">C9A6D2CB4B6B2CBDD69CD1112B514736FBB47EDB</idno><idno type="DOI">10.1111/j.0014-3820.2004.tb01643.x</idno><idno type="ArticleID">EVO261</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0014-3820</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Climate</term><term>Quercus wislizeni</term><term>hybridization</term><term>introgression</term><term>pollen dispersal</term><term>red oaks</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Climat</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Abstract The four western North American red oak species (Quercus wislizeni, Q. parvula, Q. agrifolia, and Q. kelloggii) are known to produce hybrid products in all interspecific combinations. However, it is unknown whether hybrids are transitory resulting from interspecific gene flow or whether they are maintained through extrinsic selection. Here, we examine cryptic hybrid structure in Q. wislizeni through a broad region including contact and isolation from three other western North American red oaks using amplified fragment length polymorphism molecular markers. All four species were simultaneously detected in the genetic background of individuals morphologically assigned to Q. wislizeni, although the contribution of Q. kelloggii was minor. In some cases, introgression was detected well outside the region of sympatry with one of the parental species. Molecular structure at the individual level indicated this was due to long‐distance pollen dispersal and not to local extinction of parental species. Species admixture proportions were correlated with climatic variables and greater proportions of Q. agrifolia and Q. parvula were present in the genetic background of Q. wislizeni in sites with cooler and more humid summers, corresponding with habitat preferences of the parental species. Partial Mantel tests indicated that climate was more important than distance from pollen source in this association. Despite high levels of introgression, species integrity was maintained in some populations in close proximity to the other species, providing further support to environmental selection in determining population genetic structure. Thus, the contribution of species mixtures to population genetic structure varies across the landscape according to availability of pollen, but more importantly to varying environmental selection pressures that produce a complex pattern of hybrid and pure gene pools.</div></front></TEI><affiliations><list><country><li>France</li><li>États-Unis</li></country><region><li>Californie</li><li>Provence-Alpes-Côte d'Azur</li></region><settlement><li>Marseille</li></settlement></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Dodd, Richard S" sort="Dodd, Richard S" uniqKey="Dodd R" first="Richard S." last="Dodd">Richard S. Dodd</name></region></country><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Afzal Afii, Zara" sort="Afzal Afii, Zara" uniqKey="Afzal Afii Z" first="Zara" last="Afzal-Rafii">Zara Afzal-Rafii</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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