High genetic diversity and stable Pleistocene distributional ranges in the widespread Mexican red oakQuercus castaneaNee (1801) (Fagaceae)
Por:
Peñaloza-Ramírez J.M., Rodriguez-Correa, Hernando, Gonzalez-Rodriguez, Antonio, Rocha-Ramirez, Victor, Oyama, Ken
Publicada:
1 may 2020
Resumen:
The Mexican highlands are areas of high biological complexity where taxa
of Nearctic and Neotropical origin and different population histories
are found. To gain a more detailed view of the evolution of the biota in
these regions, it is necessary to evaluate the effects of historical
tectonic and climate events on species. Here, we analyzed the
phylogeographic structure, historical demographic processes, and the
contemporary period, Last Glacial Maximum (LGM) and Last Interglacial
(LIG) ecological niche models ofQuercus castanea, to infer the
historical population dynamics of this oak distributed in the Mexican
highlands. A total of 36 populations ofQ. castaneawere genotyped with
seven chloroplast microsatellite loci in four recognized biogeographic
provinces of Mexico: the Sierra Madre Occidental (western mountain
range), the Central Plateau, the Trans-Mexican Volcanic Belt (TMVB,
mountain range crossing central Mexico from west to east) and the Sierra
Madre del Sur (SMS, southern mountain range). We obtained standard
statistics of genetic diversity and structure and tested for signals of
historical demographic expansions. A total of 90 haplotypes were
identified, and 29 of these haplotypes were restricted to single
populations. The within-population genetic diversity was high (meanh(S)
= 0.72), and among-population genetic differentiation showed a strong
phylogeographic structure (N-ST = 0.630 > G(ST) = 0.266;p < .001).
Signals of demographic expansion were identified in the TMVB and the
SMS. The ecological niche models suggested a considerable percentage of
stable distribution area for the species during the LGM and connectivity
between the TMVB and the SMS. High genetic diversity, strong
phylogeographic structure, and ecological niche models suggest in situ
permanence ofQ. castaneapopulations with large effective population
sizes. The complex geological and climatic histories of the TMVB help to
explain the origin and maintenance of a large proportion of the genetic
diversity in this oak species.
Filiaciones:
Peñaloza-Ramírez J.M.:
Escuela Nacional de Estudios Superiores (ENES) Unidad Morelia, Universidad Nacional Autónoma de México (UNAM), Morelia, Mexico
Rodriguez-Correa, Hernando:
Escuela Nacional de Estudios Superiores (ENES) Unidad Morelia, Universidad Nacional Autónoma de México (UNAM), Morelia, Mexico
Univ Nacl Autonoma Mexico, Unidad Morelia, Escuela Nacl Estudios Super ENES, Antigua Carretera Patzcuaro 8701 Col Ex Hacienda, Morelia 58190, Michoacan, Mexico
Gonzalez-Rodriguez, Antonio:
Instituto de Investigaciones en Ecosistemas y Sustentabilidad, UNAMMorelia, Mexico
UNAM, Inst Invest Ecosistemas & Sustentabilidad, Morelia, Michoacan, Mexico
Rocha-Ramirez, Victor:
Instituto de Investigaciones en Ecosistemas y Sustentabilidad, UNAMMorelia, Mexico
UNAM, Inst Invest Ecosistemas & Sustentabilidad, Morelia, Michoacan, Mexico
Oyama, Ken:
Escuela Nacional de Estudios Superiores (ENES) Unidad Morelia, Universidad Nacional Autónoma de México (UNAM), Morelia, Mexico
Univ Nacl Autonoma Mexico, Unidad Morelia, Escuela Nacl Estudios Super ENES, Antigua Carretera Patzcuaro 8701 Col Ex Hacienda, Morelia 58190, Michoacan, Mexico
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super ENES, Unidad Morelia, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
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