Publicaciones

@article{nokey,

title = {Even more oak species in Mexico? Genetic structure and morphological differentiation support the presence of at least two specific entities within Quercus laeta},

author = {Saddan Morales-Saldaña and Susana Valencia-Ávalos and Ken Oyama and Efraín Tovar-Sánchez and Andrew L. Hipp and Antonio González-Rodríguez},

doi = {10.1111/jse.12818},

issn = {17596831},

year  = {2022},

date = {2022-01-01},

journal = {Journal of Systematics and Evolution},

volume = {60},

issue = {5},

pages = {1124-1139},

publisher = {John Wiley and Sons Inc},

abstract = {Differentiation among populations, sometimes despite ongoing gene exchange, is a key step in speciation. Therefore, comparison of intra- and interspecific differentiation patterns is of great significance to understanding speciation. The genus Quercus is an interesting system to test speciation models in the presence of gene flow, due to its weak interspecific reproductive barriers. The aim of the present study was to characterize the degree and pattern of morphological and genetic differentiation among different morphotypes in the white oak Quercus laeta, some corresponding to the previously described species Quercus centralis, Q. laeta, Quercus prinopsis, and Quercus transmontana, as well as geographically structured variation within Q. transmontana not described previously. Our goal was to evaluate if some of these can be considered distinct specific entities or are rather part of a continuum of variation. Nine microsatellite loci and two intergenic regions of chloroplast DNA were analyzed. Morphological differences were evaluated using geometric morphometrics. Chloroplast DNA showed low differentiation, suggesting introgression or sharing of ancestral haplotypes among the Q. laeta morphotypes. Nuclear microsatellites indicated differentiation into two distinct main genetic groups, which were congruent with morphological differentiation. In conclusion, nuclear markers and morphological variations suggest the existence of at least two different entities within Q. laeta.},

keywords = {gene flow, genetic differentiation, leaf morphometrics, microsatellite loci, morphotype, population assignment, species delimitation},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Landscape genetics of the tropical willow Salix humboldtiana: influence of climate, salinity, and orography in an altitudinal gradient},

author = {Mariana S. Hernández-Leal and Marco Suárez-Atilano and Sergio Nicasio-Arzeta and Daniel Piñero and Antonio González-Rodríguez},

doi = {10.1002/ajb2.1824},

issn = {15372197},

year  = {2022},

date = {2022-01-01},

journal = {American Journal of Botany},

volume = {109},

issue = {3},

pages = {456-469},

publisher = {John Wiley and Sons Inc},

abstract = {Premise: Gene flow in riparian ecosystems is influenced by landscape features such as orography, climate, and salinity. The downstream increase in genetic diversity (DIGD) hypothesis states that the unidirectionality of the watercourse causes an accumulation of genetic diversity toward downstream populations, while upstream populations are more structured and less diverse, especially in water-dispersed organisms. Methods: We used chloroplast and nuclear microsatellites to characterize genetic diversity, structure, and gene flow patterns among populations of Salix humboldtiana across an elevation and salinity gradient on three rivers (Actopan, Antigua, and Blanco) in Mexico. We used optimization of resistance surface methods to determine whether genetic distances between populations are correlated with landscape features. Results: Positive FIS values evidenced biparental inbreeding in some populations, particularly at higher elevations where lower niche availability constrains colonization and persistence. Four genetic groups were distinguished, corresponding to populations on the Actopan and Antigua rivers and upstream and downstream on the Blanco, but with high admixture between populations on the Actopan and Antigua rivers. Higher gene flow rates were found among proximate populations on the same river than among different rivers. Genetic diversity increased toward the river mouths, in support of the DIGD hypothesis, probably due to greater niche availability and larger population size. Differences among rivers in precipitation patterns and salinity, as well as geographic distance, were significant predictors of gene flow. Conclusions: Our results depict that the DIGD and gene flow patterns in S. humboldtiana result from the complex interaction among physiography, climate, river salinity, and life-history traits of the species.},

keywords = {DIGD hypothesis, gene flow, genetic structure, Mexico, resistance analysis, riparian tree, Salicaceae},

pubstate = {published},

tppubtype = {article}

}

@article{Rodriguez-Correa2018,

title = {Contrasting Patterns of Population History and Seed-mediated Gene Flow in Two Endemic Costa Rican Oak Species},

author = {Hernando Rodríguez-Correa and Ken Oyama and Mauricio Quesada and Eric J. Fuchs and Antonio González-Rodríguez},

doi = {10.1093/jhered/esy011},

issn = {14657333},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Heredity},

volume = {109},

issue = {5},

pages = {530-542},

abstract = {Lower Central America is an important area to study recent population history and diversification of Neotropical species due to its complex and dynamic geology and climate. Phylogeographic studies in this region are few in comparison with other regions and even less for tree species. The aim of the present study was to characterize the phylogeographic structure in 2 partially co-distributed endemic oak species (Quercus costaricensis and Q. bumelioides) of the Costa Rican mountains using chloroplast short sequence repeats (cpSSRs), and to test for the effect of geological and palaeoclimatic processes on their population history. Genetic diversity and structure, haplotype networks, patterns of seed-mediated gene flow and historical demography were estimated for both species. Results suggested contrasting patterns. Quercus costaricensis exhibited high values of genetic diversity, a marked phylogeographic structure, a north-to-south genetic diversity gradient and evidence of a demographic expansion during the Quaternary. Quercus bumelioides did not show significant genetic structure and the haplotype network and historical demography estimates suggested a recent population expansion probably during the Pleistocene-Holocene transition. The phylogeographic structure of Q. costaricensis seems to be related to Pleistocene altitudinal migration due to its higher altitudinal distribution. Meanwhile, historical seed-mediated gene flow through the lower altitudinal distribution of Q. bumelioides may have promoted the homogenization of genetic variation. Population expansion and stable availability of suitable climatic areas in both species probably indicate that palaeoclimatic changes promoted downwards altitudinal migration and formation of continuous forests allowing oak species to expand their distribution into the Panamanian mountains during glacial stages.},

keywords = {chloroplast microsatellites, Fagaceae, gene flow, Middle America, Phylogeography, Quercus},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Phylogeography and climate-associated morphological variation in the endemic white oak Quercus deserticola (Fagaceae) along the Trans-Mexican Volcanic Belt},

author = {Flor Rodríguez-Gómez and Ken Oyama and Magaly Ochoa-Orozco and Luis Mendoza-Cuenca and Ricardo Gaytán-Legaria and Antonio González-Rodríguez},

doi = {10.1139/cjb-2017-0116},

issn = {19162804},

year  = {2018},

date = {2018-01-01},

journal = {Botany},

volume = {96},

issue = {2},

pages = {121-131},

publisher = {Canadian Science Publishing},

abstract = {Mexico is a center of diversification for the genus Quercus, with an important number of taxa occurring along the Trans-Mexican Volcanic Belt (TMVB). However, the impact of the interaction between historical and current climatic variation and geological heterogeneity in the TMVB on the genetic and phenotypic diversification within oak species has been scarcely investigated. We used chloroplast DNA microsatellites and a geometric morphometrics analysis of leaf shape to understand differentiation between populations of Quercus deserticola Trel., which inhabits dry highlands along the TMVB. Ecological niche modeling for present-day conditions and projections into past scenarios were performed to evaluate the influence of environmental variables on the evolutionary history of the species. Results showed high genetic diversity (hS = 0.774) and high genetic structure (RST = 0.75) and the morphological subdivision of populations into two clusters, corresponding to the west/south and east/north sectors of the Q. deserticola geographic distribution. Ecological niche modeling indicated that the potential distribution of the species has remained similar from the late Pleistocene to the present. Seemingly, the phylogeographic structure of the species has been shaped by low seed-mediated gene flow and mostly local migration patterns. In turn, leaf shape is responding to climate differences either through phenotypic plasticity or local adaptation.},

keywords = {ecological niche modeling, gene flow, Last Glacial Maximum, Mexican oaks},

pubstate = {published},

tppubtype = {article}

}

@article{Oyama2017,

title = {Gene flow interruption in a recently human-modified landscape: The value of isolated trees for the maintenance of genetic diversity in a Mexican endemic red oak},

author = {Ken Oyama and María Luisa Herrera-Arroyo and Víctor Rocha-Ramírez and Julieta Benítez-Malvido and Eduardo Ruiz-Sánchez and Antonio González-Rodríguez},

url = {http://dx.doi.org/10.1016/j.foreco.2017.01.018},

doi = {10.1016/j.foreco.2017.01.018},

issn = {03781127},

year  = {2017},

date = {2017-01-01},

journal = {Forest Ecology and Management},

volume = {390},

pages = {27-35},

publisher = {Elsevier B.V.},

abstract = {Gene flow within and among populations is an important factor to maintain genetic cohesiveness and diversity across landscapes. Nowadays, human land use has led to a large forest conversion, creating many fragmented areas where remnant trees play an important role in conserving biodiversity. In this study, we analyzed the effects of a recent anthropogenic forest fragmentation on the genetic diversity and genetic heterogeneity of pollen pools accepted by individuals of the red oak Quercus castanea growing in forest patches and as isolated trees in central Mexico. Pollen movement was also evaluated by the analysis of outcrossing rates using seven nuclear microsatellites. We assumed that adult trees are remnants of the populations that existed previous to the forest fragmentation, while progenies of these trees are the result of recent reproductive events occurring after the fragmentation. We found high genetic diversity in both adult trees and progenies, even though progenies of isolated trees showed a significant reduction in heterozygosity as compared to their mother trees. However, the results of TWOGENER and mating system analyses indicated similar numbers of pollen donors in the progenies of mother trees from fragments and in isolated trees. Overall, our results suggest that gene flow is still extensive among forest fragments and isolated trees, conferring them a great value for the conservation of genetic diversity and connectivity.},

keywords = {Forest fragmentation, gene flow, Genetic diversity, Isolated trees, Outcrossing rates, Quercus castanea},

pubstate = {published},

tppubtype = {article}

}

@article{Balvino-Olvera2017,

title = {Latitudinal structured populations of the Mexican wild squash Cucurbita argyrosperma subsp. sororia revealed by microsatellite markers},

author = {Francisco J. Balvino-Olvera and Karman F. Sánchez-Gómez and Jorge Arturo Lobo and Germán Avila-Sakar and Rogelio Cruz-Reyes and Gumersindo Sánchez-Montoya and Yvonne Herrerías-Diego and Antonio González-Rodríguez and Mauricio Quesada},

doi = {10.1071/CP17341},

issn = {18365795},

year  = {2017},

date = {2017-01-01},

journal = {Crop and Pasture Science},

volume = {68},

issue = {9},

pages = {850-858},

abstract = {Crop wild relatives represent an important agronomic resource for crop improvement and biodiversity conservation. The wild squash Cucurbita argyrosperma subsp. sororia. (Cucurbitaceae) has been considered the wild ancestor of cultivated forms of C. argyrosperma. In order to characterise the geographic patterns of genetic variation in this wild cucurbit and to identify priority areas for conservation, we analysed the genetic diversity and structure of natural populations along the Mexican Pacific coast. By using 14 polymorphic microsatellites, we genotyped 378 individuals sampled from 61 locations. Standard population genetics analyses and group testing were conducted on the genotypes with the aid of principal coordinate analysis and Bayesian analysis. Overall, we found an average of 12.3 alleles per locus and an expected heterozygosity of 0.756. We found greater genetic diversity in southern populations. The fixation index was 0.113, suggesting a mixed mating system. The Mantel test revealed a minor distance effect on genetic differentiation between individuals (r≤0.321). Finally, we found three main groups of populations arranged in a mostly latitudinal pattern, from Sinaloa (north-west) to Oaxaca-Guerrero (south-east). The greater genetic diversity and heterogeneity among southern populations (Guerrero-Oaxaca), suggests that this region is an important centre of diversity of this wild squash with important implications for conservation.},

keywords = {gene flow, genetic structure, plant mating systems, plant reproduction, SSR's, wild and cultivated species, wild gourds},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Perspectivas de la Ecología Molecular en un país megadiverso},

author = {Hernando Rodríguez-Correa and Antonio González-Rodríguez and Ken Oyama},

doi = {10.1016/j.rmb.2017.10.002},

issn = {18703453},

year  = {2017},

date = {2017-01-01},

journal = {Revista Mexicana de Biodiversidad},

volume = {88},

pages = {3-13},

publisher = {Universidad Nacional Autonoma de Mexico},

abstract = {A review of studies on Molecular Ecology in Mexico is presented. Between 1990 and 2016, we identified 656 published studies on Molecular Ecology. The best represented subject areas were population genetics (35.3% of the studies) and phylogeography (30.3%), while emergent fields in molecular ecology, such as landscape genomics, DNA-based trophic ecology, and kinship, parentage and behavior were scarcely represented. Most frequently studied systems were animals (58.5%) and plants (32.5%), while other organisms such as fungi, protozoa and bacteria have received much less attention. In general, a considerable development of Molecular Ecology is observable in our country. However, for this tendency to continue it will be necessary to incorporate more extensively technological advances such as next generation sequencing and bioinformatics, as well as to venture into the emergent areas of the discipline.},

keywords = {Conservation biology, gene flow, Genomics, Molecular markers, Next generation sequencing, Phylogeography, Population genetics},

pubstate = {published},

tppubtype = {article}

}