Publicaciones

@article{nokey,

title = {High genetic diversity and stable Pleistocene distributional ranges in the widespread Mexican red oak Quercus castanea Née (1801) (Fagaceae)},

author = {Juan Manuel Peñaloza-Ramírez and Hernando Rodríguez-Correa and Antonio González-Rodríguez and Víctor Rocha-Ramírez and Ken Oyama},

doi = {10.1002/ece3.6189},

issn = {20457758},

year  = {2020},

date = {2020-01-01},

journal = {Ecology and Evolution},

volume = {10},

issue = {10},

pages = {4204-4219},

publisher = {John Wiley and Sons Ltd},

abstract = {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 of Quercus castanea, to infer the historical population dynamics of this oak distributed in the Mexican highlands. A total of 36 populations of Q. castanea were 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 (mean hS = 0.72), and among-population genetic differentiation showed a strong phylogeographic structure (NST = 0.630 > GST = 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 of Q. castanea populations 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.},

keywords = {genetic variation, historical demography, Mexican Highlands, Neotropical trees, Oaks, Phylogeography},

pubstate = {published},

tppubtype = {article}

}

@article{Figueredo2015,

title = {Genetic structure of coexisting wild and managed agave populations: implications for the evolution of plants under domestication},

author = {Carmen Julia Figueredo and Alejandro Casas and Antonio González-Rodríguez and Jafet M. Nassar and Patricia Colunga-GarcíaMarín and Víctor Rocha-Ramírez},

doi = {10.1093/aobpla/plv114},

issn = {2041-2851},

year  = {2015},

date = {2015-01-01},

journal = {AoB Plants},

pages = {plv114},

abstract = {Domestication is a continuous evolutionary process guided by humans. This process leads to divergence in characteristics such as behavior, morphology, or genetics, between wild and managed populations. Agaves have been important resources for Mesoamerican peoples since prehistory. Some species are domesticated and others vary in degree of domestication. Agave inaequidens is used in central Mexico to produce mescal, and a management gradient from gathered wild and silvicultural populations, as well as cultivated plantations, has been documented. Significant morphological differences were reported among wild and managed populations, and a high phenotypic variation in cultivated populations composed by plants from different populations. We evaluated levels of genetic diversity and structure associated with management, hypothesizing that high morphological variation would be accompanied by high genetic diversity in populations with high gene flow and low genetic structure among managed and unmanaged populations. Wild, silvicultural, and cultivated populations were studied, collecting tissue of 19 to 30 plants per population. Through 10 nuclear microsatellite loci we compared population genetics parameters. We analysed partition of variation associated with management categories to estimate gene flow among populations. A. inaequidens exhibits high levels of genetic diversity (He=0.707) and moderate genetic structure (FST=0.112). No differences were found in levels of genetic diversity among wild (He=0.704), silviculturally managed (He=0.733), and cultivated (He=0.698) populations. Bayesian analysis indicated that five genetic clusters best fit the data, with genetic groups corresponding to habitats where populations grow rather than to management. Migration rates ranged from zero between two populations to markedly high among others (M=0.73-35.25). Natural mechanisms of gene flow and the dynamic management of agave propagules among populations favor gene flow and the maintenance of high levels of variation within all populations. The slight differentiation associated with management indicates that domestication is in an incipient stage.},

keywords = {agave inaequidens, agaves, conservation genetics, domestication, genetic structure, genetic variation},

pubstate = {published},

tppubtype = {article}

}

@article{Herrera-Arroyo2013,

title = {Seed-mediated connectivity among fragmented populations of Quercus castanea (Fagaceae) in a Mexican landscape},

author = {M. Luisa Herrera-Arroyo and Victoria L. Sork and Antonio González-Rodríguez and Víctor Rocha-Ramírez and Ernesto Vega and Ken Oyama},

doi = {10.3732/ajb.1200396},

issn = {00029122},

year  = {2013},

date = {2013-01-01},

journal = {American Journal of Botany},

volume = {100},

issue = {8},

pages = {1663-1671},

abstract = {Premise of study: Anthropogenic fragmentation is an ongoing process in many forested areas that may create loss of connectivity among tree populations and constitutes a serious threat to ecological and genetic processes. We tested the central hypothesis that seed dispersal mitigates the impact of fragmentation by comparing connectivity and genetic diversity of adult vs. seedling populations in recently fragmented populations of the Mexican red oak Quercus castanea. Methods: Adult individuals, established before fragmentation, and seedlings, established after fragmentation, were sampled at 33 forest fragments of variable size (0.2 to 294 ha) within the Cuitzeo basin, Michoacán state, and genotyped using seven highly polymorphic chloroplast microsatellite markers (cpSSRs). To test whether seed dispersal retains connectivity among fragmented populations, we compared genetic diversity and connectivity networks between adults and progeny and determined the effect of fragment size on these values. • Key results: Seventy haplotypes were identified, 63 in the adults and 60 in the seedlings, with average within-population diversity (h S) values of 0.624 in the adults and 0.630 in the seedlings. A positive correlation of genetic diversity values with fragment size was found in the seedling populations but not in the adult populations. The network connectivity analysis revealed lower connectivity among seedling populations than among adults. The number of connections (edges) as well as other network properties, such as betweenness centrality, node degree and closeness, were significantly lower in the seedlings network. • Conclusions: Habitat fragmentation in this landscape is disrupting seed-dispersal-mediated genetic connectivity among extant populations. © 2013 Botanical Society of America.},

keywords = {Chloroplast dna, Fagaceae, Forest fragmentation, genetic connectivity, genetic variation, Microsatellites, Quercus castanea},

pubstate = {published},

tppubtype = {article}

}