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Hybridization of Quercus castanea (Fagaceae) across a red oak species gradient in Mexico

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Abstract

Interspecific gene flow between more than two species is a common phenomenon in oaks, which can occur simultaneously among different species, promoting the transfer of genetic material across species boundaries. However, the hybridization dynamics in multispecies hybrid zones remain unknown. In this study, we provide genetic evidence of hybridization and introgression of Quercus castanea across a natural gradient of red oak species richness. We analyzed five populations recognized morphologically as “pure” Q. castanea, one allopatric and four sympatric populations, where the number of red oak species associated with Q. castanea ranged from one to four. Also, one allopatric population of each red oak species that occurs in sympatry with Q. castanea was chosen as reference population (Q. crassipes, Q. laurina, Q. mexicana and Q. crassifolia). In total, six nSSRs were used in 10 and 20 individuals from each allopatric and sympatric populations, respectively. Our results showed that allopatric populations formed completely distinct genetic clusters. In sympatric populations, we found evidence of hybridization and introgression among Q. castanea and three of its associated red oak species. However, the occurrence and frequency of hybrids between Q. castanea and these species varied among stands. Our analyses provide evidence and new insights into hybridization and introgression dynamics within a Mexican red oak species complex, through a focal species, Q. castanea.

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Acknowledgments

The authors thank Gabriel Flores, Mauricio Mora, Efraín Ramirez, and Guillermo Sánchez for their help with field collections. We also thank Laura Marquez for technical assistance and Tatiana Cervantes for help with the red oaks leaves illustrations. This research was supported by grants from CONACYT- Mexico (61725) to E.T.S. Also, this research was supported by scholarship from CONACYT-SEP Mexico to L.V.C. We also thank the Posgrado en Ciencias Biológicas (UNAM).

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  1. Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Apartado Postal 70-181, Delegación Coyoacán, 04510, Mexico, DF, Mexico

    Leticia Valencia-Cuevas & Elgar Castillo-Mendoza

  2. Departamento de Sistemática y Evolución, Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, CP 62209, Cuernavaca, Morelos, Mexico

    Patricia Mussali-Galante, Guadalupe Rangel-Altamirano & Efraín Tovar-Sánchez

  3. Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Delegación Coyoacán, 04510, Mexico, DF, Mexico

    Daniel Piñero

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  1. Leticia Valencia-Cuevas
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Correspondence to Efraín Tovar-Sánchez.

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Valencia-Cuevas, L., Mussali-Galante, P., Piñero, D. et al. Hybridization of Quercus castanea (Fagaceae) across a red oak species gradient in Mexico. Plant Syst Evol 301, 1085–1097 (2015). https://doi.org/10.1007/s00606-014-1151-4

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