Species status of hybridizing oaks

Muir, G. W.; Fleming, Colin C.; Schl��tterer, Christian

doi:10.1038/35016640

Cited by 135 publications

(130 citation statements)

References 6 publications

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“…This low rate was consistent with the relatively large genetic differentiation between these two oak species. Whilst Muir et al (2000) failed in the assignment of 22% of individuals to Q. petraea or Q. robur using 20 microsatellites, four microsatellites were sufficient to assign almost all individuals in a mixed Q. lobata and Q. douglasii population (Craft et al, 2002). In our study, using five microsatellite markers, we were able to infer the degree of introgression in Montejo, which is similar to that reported by Craft et al (2002).…”

Section: Genetic Differentiation and Introgression Between Speciessupporting

confidence: 74%

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Gene flow and hybridisation in a mixed oak forest (Quercus pyrenaica Willd. and Quercus petraea (Matts.) Liebl.) in central Spain

Valbuena‐Carabaña¹,

González‐Martínez²,

Sork³

et al. 2005

Heredity

116

103

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Oaks are long-standing models for the study of gene flow and hybridisation. Temperate (Quercus petraea) and subMediterranean (Quercus pyrenaica) oaks coexist in central Spain, showing remarkable differences in population size and structure. Q. petraea has a scattered distribution in central Spain, where it is at one of the southernmost limits of its range, and forms low-density stands; in contrast, Q. pyrenaica is widespread in the region. We selected a mixed population of the two species (B13 ha, 176 adults and 96 saplings) to compare the patterns of gene flow within each species and the extent of introgression between them. Using five nuclear microsatellite markers, we performed a parentage analysis and found considerable immigration from outside the stand (B38% for Q. petraea and B34% for Q. pyrenaica), and estimated average seed-dispersal distances of 42 and 14 m for Q. petraea and Q. pyrenaica, respectively. Introgression between species was also estimated using our microsatellite battery. First, we developed a multivariate discriminant approach and, second, we compared our results with a widely used clustering method (STRUCTURE). Both analyses were consistent with a low level of introgression between Q. petraea and Q. pyrenaica. Indeed, only 15 adult trees, B8.5%, were identified as putative hybrids when both methods of analysis were combined. Hybrids may be most common in contact zones due merely to physical proximity. Heredity (2005) 95, 457-465.

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Section: Genetic Differentiation and Introgression Between Speciessupporting

confidence: 74%

“…In this genus, longdistance gene flow is suggested, then, to break the ecological isolation needed for new species formation, resulting in complex hybrid systems (eg, white oaks, including the Quercus petraea-Q. robur complex; Whittemore and Schaal, 1991;Muir et al, 2000;Petit et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Gene flow and hybridisation in a mixed oak forest (Quercus pyrenaica Willd. and Quercus petraea (Matts.) Liebl.) in central Spain

Valbuena‐Carabaña¹,

González‐Martínez²,

Sork³

et al. 2005

Heredity

116

103

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“…For the present study, microsatellite markers were chosen due to their applicability in earlier studies of hybridization (Muir et al, 2000;Beaumont et al, 2001;Coart et al, 2003), codominance, and ease of interpretation in studies of population differentiation (Balloux and Lugon-Moulin, 2002), high level of diversity, and reproducibility allowing for future comparisons of European data (Jones et al, 1997). Potentially, homoplasy can pose a problem in delineating the relationship between taxonomic units (Goldstein & Pollock, 1997).…”

Section: Introductionmentioning

confidence: 99%

Hybridization and genetic variation in Danish populations of European crab apple (Malus sylvestris)

Larsen

Asmussen²,

Coart³

et al. 2006

Tree Genetics & Genomes

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The aim of the present study was to investigate the genetic variation in Danish populations of the endangered European crab apple (Malus sylvestris). Special emphasis was given to hybridization between the wild species and its cultivated relative Malus ×domestica. A total of 178 wild individuals from four Danish populations were studied along with a reference sample of 29 old cultivars. The genetic variation within and among samples was studied at ten microsatellite marker loci. Additionally, a morphological analysis was carried out to identify hybrids and test for correspondence between phenotypic and genotypic indices of hybridization.From application of ordination and a model based cluster analysis to the molecular data, two clusters were identified consisting of wild and cultivated individuals respectively. This indicates that pronounced admixture between the two species is not present. At the population level, a high correspondence was found between geographic isolation from M. ×domestica and genotypic and morphological indices of hybridization. As expected, isolated populations appeared less affected by hybridization than poorly isolated populations. Isolated 'pure' M. sylvestris populations could thus be identified. However, morphological and molecular evidence of hybridization was found to be divergent at the individual level. This is suggestive of some historical introgression into the M. sylvestris gene pool, and indicates that relying exclusively on either morphological or molecular characters as diagnostic markers in studies of hybridization between M. ×domestica and M. sylvestris might lead to fallible results. Combined application of genetic and morphological markers is therefore recommended.3

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“…Also in other locations of Japan, most Quercus trees can be differentiated into either of the parental species (Ohba 1989;Ishida et al 2003;Kanno et al 2004;Okaura et al 2007;Matsumoto et al 2009). The maintenance of species distinctiveness despite frequent hybridization has also been reported for a number of hybridizing Quercus species pairs, e.g., Q. grisea -Q. gambelii (Howard et al 1997), Q. robur -Q. petrea (Muir et al 2000), Q. lobata -Q. douglasii (Craft et al 2002) In the principle component analysis on Phyllonorycter (leafminers) and Tuberculatus (aphids) compositions, the first axis (PC1) showed a strong correlation with CV1, indicating that the compositions differed between Q. dentata and Q. crispula (or Q. serrata). On the other hand, none of PC scores was significantly correlated with CV2, suggesting that the compositions did not differ between Q. crispula and Q. serrata.…”

Section: Discussionmentioning

confidence: 72%

Differences in leafminer (Phyllonorycter, Gracillariidae, Lepidoptera) and aphid (Tuberculatus, Aphididae, Hemiptera) composition amongQuercus dentata,Q. crispula,Q. serrata, and their hybrids

Hata

Hashiba

Nakamura

et al. 2011

Journal of Forest Research

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Differences in leafminer (Phyllonorycter, Gracillariidae, Lepidoptera) and aphid (Tuberculatus, Aphididae, Hemiptera) compositions among Quercus dentata, Q. crispula, Q. serrata and their hybridsYoshihiro Hata  Takuto Hashiba  Takashi Nakamura  Masashi Kitamura  Takahide 2 Abstract Leafminer (Phyllonorycter, Gracillariidae, Lepidoptera) and aphid (Tuberculatus, Aphididae, Hemiptera) compositions were studied in three deciduous oak species, Quercus dentata, Q. crispula and Q. serrata, and their hybrids in Tomakomai Experimental Forest of Hokkaido University, Hokkaido, northern Japan. Identification of trees in this forest was done mainly on the basis of discriminant analysis on leaf morphology with reference to trees in pure Q. dentata and Q. crispula stands and a Q. serrata stand mixed with Q. crispula. The results suggested that hybridization occurred in all combinations (i.e., Q. dentata-Q. crispula, Q. crispula-Q. serrata, and Q. serrata-Q. dentata) and the frequency of hybrids was about 10 %. The composition of Phyllonorycter and Tuberculatus species differed between Q. dentata and Q. crispula or Q. serrata, but did not differ between Q. crispula and Q. serrata. Thus, Q. dentata would differ from Q. crispula and Q. serrata in chemical properties that determine herbivore host selection, survival and performance, possibly reflecting their eco-physiological differences or phylogenetic distances. The study insects were divided into three groups; species specialized to Q. dentata (three Phyllonorycter and one Tuberculatus species), those to Q. crispula and Q. serrata (six Phyllonorycter and two Tuberculatus species), and a species collected at least from Q. dentata and Q. crispula (one Tuberculatus species). Putative hybrid trees of Q. dentata and Q. crispula harbored both Q. dentata-and Q. crispula-specific insects.

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Species status of hybridizing oaks

Cited by 135 publications

References 6 publications

Gene flow and hybridisation in a mixed oak forest (Quercus pyrenaica Willd. and Quercus petraea (Matts.) Liebl.) in central Spain

Gene flow and hybridisation in a mixed oak forest (Quercus pyrenaica Willd. and Quercus petraea (Matts.) Liebl.) in central Spain

Hybridization and genetic variation in Danish populations of European crab apple (Malus sylvestris)

Differences in leafminer (Phyllonorycter, Gracillariidae, Lepidoptera) and aphid (Tuberculatus, Aphididae, Hemiptera) composition amongQuercus dentata,Q. crispula,Q. serrata, and their hybrids

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