2022
Hernández-Leal, Mariana S.; Suárez-Atilano, Marco; Nicasio-Arzeta, Sergio; Piñero, Daniel; González-Rodríguez, Antonio
Landscape genetics of the tropical willow Salix humboldtiana: influence of climate, salinity, and orography in an altitudinal gradient Artículo de revista
En: American Journal of Botany, vol. 109, iss. 3, pp. 456-469, 2022, ISSN: 15372197.
Resumen | Enlaces | Etiquetas: DIGD hypothesis, gene flow, genetic structure, Mexico, resistance analysis, riparian tree, Salicaceae
@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}
}
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.
2021
López-Barrera, Gabriela; Ochoa-Zavala, Maried; Quesada, Mauricio; Harvey, Nick; Núñez-Farfán, Juan; González-Rodríguez, Antonio; Rocha-Ramírez, Víctor; Oyama, Ken
Genetic imprints of Brosimum alicastrum Sw. in Mexico Artículo de revista
En: American Journal of Botany, vol. 108, iss. 9, pp. 1793-1807, 2021, ISSN: 15372197.
Resumen | Enlaces | Etiquetas: Brosimum alicastrum, Genetic diversity, geographical barriers, lowland tropical trees, Mexico, Moraceae, population genetic structure
@article{nokey,
title = {Genetic imprints of Brosimum alicastrum Sw. in Mexico},
author = {Gabriela López-Barrera and Maried Ochoa-Zavala and Mauricio Quesada and Nick Harvey and Juan Núñez-Farfán and Antonio González-Rodríguez and Víctor Rocha-Ramírez and Ken Oyama},
doi = {10.1002/ajb2.1725},
issn = {15372197},
year = {2021},
date = {2021-01-01},
journal = {American Journal of Botany},
volume = {108},
issue = {9},
pages = {1793-1807},
publisher = {John Wiley and Sons Inc},
abstract = {Premise: The mechanisms generating the geographical distributions of genetic diversity are a central theme in evolutionary biology. The amount of genetic diversity and its distribution are controlled by several factors, including dispersal abilities, physical barriers, and environmental and climatic changes. We investigated the patterns of genetic diversity and differentiation among populations of the widespread species Brosimum alicastrum in Mexico. Methods: Using nuclear DNA microsatellite data, we tested whether the genetic structure of B. alicastrum was associated with the roles of the Trans-Mexican Volcanic Belt and the Isthmus of Tehuantepec as geographical barriers to gene flow and to infer the role of past events in the genetic diversity patterns. We further used a maximum-likelihood population-effects mixed model (MLPE) to identify the main factor affecting population differentiation in B. alicastrum. Results: Our results suggested that Mexican B. alicastrum is well differentiated into three main lineages. Patterns of the genetic structure at a finer scale did not fully correspond to the current geographical barriers to gene flow. According to the MLPE mixed model, isolation by distance is the best model for explaining the genetic differentiation of B. alicastrum in Mexico. Conclusions: We propose that the differentiation patterns might reflect (1) an ancient differentiation that occurred in Central and South America, (2) the effects of past climatic changes, and (3) the functions of some physical barriers to gene flow. This study provides insights into the possible mechanisms underlying the geographic genetic variation of B. alicastrum along a moisture gradient in tropical lowland forests.},
keywords = {Brosimum alicastrum, Genetic diversity, geographical barriers, lowland tropical trees, Mexico, Moraceae, population genetic structure},
pubstate = {published},
tppubtype = {article}
}
Premise: The mechanisms generating the geographical distributions of genetic diversity are a central theme in evolutionary biology. The amount of genetic diversity and its distribution are controlled by several factors, including dispersal abilities, physical barriers, and environmental and climatic changes. We investigated the patterns of genetic diversity and differentiation among populations of the widespread species Brosimum alicastrum in Mexico. Methods: Using nuclear DNA microsatellite data, we tested whether the genetic structure of B. alicastrum was associated with the roles of the Trans-Mexican Volcanic Belt and the Isthmus of Tehuantepec as geographical barriers to gene flow and to infer the role of past events in the genetic diversity patterns. We further used a maximum-likelihood population-effects mixed model (MLPE) to identify the main factor affecting population differentiation in B. alicastrum. Results: Our results suggested that Mexican B. alicastrum is well differentiated into three main lineages. Patterns of the genetic structure at a finer scale did not fully correspond to the current geographical barriers to gene flow. According to the MLPE mixed model, isolation by distance is the best model for explaining the genetic differentiation of B. alicastrum in Mexico. Conclusions: We propose that the differentiation patterns might reflect (1) an ancient differentiation that occurred in Central and South America, (2) the effects of past climatic changes, and (3) the functions of some physical barriers to gene flow. This study provides insights into the possible mechanisms underlying the geographic genetic variation of B. alicastrum along a moisture gradient in tropical lowland forests.
2018
Oyama, Ken; Ramírez-Toro, Wilfrido; Peñaloza-Ramírez, Juan Manuel; Pedraza, Alberto Esteban Pérez; Torres-Miranda, César Andrés; Ruiz-Sánchez, Eduardo; González-Rodríguez, Antonio
High Genetic Diversity and Connectivity Among Populations of Quercus candicans , Quercus crassifolia , and Quercus castanea in a Heterogeneous Landscape in Mexico Artículo de revista
En: Tropical Conservation Science, vol. 11, pp. 194008291876619, 2018, ISSN: 1940-0829.
Resumen | Enlaces | Etiquetas: conservation genetics, genetic connectivity, genetic diversity and structure, Mexico, Quercus
@article{Oyama2018,
title = {High Genetic Diversity and Connectivity Among Populations of Quercus candicans , Quercus crassifolia , and Quercus castanea in a Heterogeneous Landscape in Mexico},
author = {Ken Oyama and Wilfrido Ramírez-Toro and Juan Manuel Peñaloza-Ramírez and Alberto Esteban Pérez Pedraza and César Andrés Torres-Miranda and Eduardo Ruiz-Sánchez and Antonio González-Rodríguez},
doi = {10.1177/1940082918766195},
issn = {1940-0829},
year = {2018},
date = {2018-01-01},
journal = {Tropical Conservation Science},
volume = {11},
pages = {194008291876619},
abstract = {Oaxaca state is one of the main hotspots of biodiversity in Mexico, containing almost 40% of the Mexican vascular flora, due to its high variability in habitat and climatic conditions coupled with high elevations in mountains and low elevations in valleys. We studied the genetic diversity and population structure of Quercus candicans, Quercus crassifolia, and Quercus castanea across their geographical distribution in Oaxaca state to understand how the heterogeneous physiography had driven the genetic diversity and population differentiation in these three oak species. We found high levels of genetic diversity but ca. 40% of the populations had significant values of Wright’s inbreeding coefficient. The analysis of molecular variance indicated that most of the variation occurred within populations in the three oak species. Resistance analyses showed connectivity among almost all the populations but barrier analysis found genetic breaks that limited gene flow among some populations of the oak species. Even in a heterogeneous environment such as in Oaxaca state, the oak species still have high levels of genetic diversity and landscape connectivity. However, it is necessary to maintain the genetic connectivity through the preservation of natural corridors with forests in good condition, which is necessary to maintain the cohesiveness of the species in the long term. It is also important to protect the centers of species diversity in Oaxaca state located in the subprovinces of Western Oaxacan Mountains and Valleys, Sierra Madre de Oaxaca, and Sierra Madre del Sur because they harbor most of the population genetic diversity and oak species richness, as has been shown in previous studies.},
keywords = {conservation genetics, genetic connectivity, genetic diversity and structure, Mexico, Quercus},
pubstate = {published},
tppubtype = {article}
}
Oaxaca state is one of the main hotspots of biodiversity in Mexico, containing almost 40% of the Mexican vascular flora, due to its high variability in habitat and climatic conditions coupled with high elevations in mountains and low elevations in valleys. We studied the genetic diversity and population structure of Quercus candicans, Quercus crassifolia, and Quercus castanea across their geographical distribution in Oaxaca state to understand how the heterogeneous physiography had driven the genetic diversity and population differentiation in these three oak species. We found high levels of genetic diversity but ca. 40% of the populations had significant values of Wright’s inbreeding coefficient. The analysis of molecular variance indicated that most of the variation occurred within populations in the three oak species. Resistance analyses showed connectivity among almost all the populations but barrier analysis found genetic breaks that limited gene flow among some populations of the oak species. Even in a heterogeneous environment such as in Oaxaca state, the oak species still have high levels of genetic diversity and landscape connectivity. However, it is necessary to maintain the genetic connectivity through the preservation of natural corridors with forests in good condition, which is necessary to maintain the cohesiveness of the species in the long term. It is also important to protect the centers of species diversity in Oaxaca state located in the subprovinces of Western Oaxacan Mountains and Valleys, Sierra Madre de Oaxaca, and Sierra Madre del Sur because they harbor most of the population genetic diversity and oak species richness, as has been shown in previous studies.
Oyama, Ken; Ramírez-Toro, Wilfrido; Peñaloza-Ramírez, Juan Manuel; Pedraza, Alberto Esteban Pérez; Torres-Miranda, César Andrés; Ruiz-Sánchez, Eduardo; González-Rodríguez, Antonio
High Genetic Diversity and Connectivity Among Populations of Quercus candicans, Quercus crassifolia, and Quercus castanea in a Heterogeneous Landscape in Mexico Artículo de revista
En: Tropical Conservation Science, vol. 11, 2018, ISSN: 19400829.
Resumen | Enlaces | Etiquetas: conservation genetics, genetic connectivity, genetic diversity and structure, Mexico, Quercus
@article{Oyama2018b,
title = {High Genetic Diversity and Connectivity Among Populations of Quercus candicans, Quercus crassifolia, and Quercus castanea in a Heterogeneous Landscape in Mexico},
author = {Ken Oyama and Wilfrido Ramírez-Toro and Juan Manuel Peñaloza-Ramírez and Alberto Esteban Pérez Pedraza and César Andrés Torres-Miranda and Eduardo Ruiz-Sánchez and Antonio González-Rodríguez},
doi = {10.1177/1940082918766195},
issn = {19400829},
year = {2018},
date = {2018-01-01},
journal = {Tropical Conservation Science},
volume = {11},
publisher = {SAGE Publications Inc.},
abstract = {Oaxaca state is one of the main hotspots of biodiversity in Mexico, containing almost 40% of the Mexican vascular flora, due to its high variability in habitat and climatic conditions coupled with high elevations in mountains and low elevations in valleys. We studied the genetic diversity and population structure of Quercus candicans, Quercus crassifolia, and Quercus castanea across their geographical distribution in Oaxaca state to understand how the heterogeneous physiography had driven the genetic diversity and population differentiation in these three oak species. We found high levels of genetic diversity but ca. 40% of the populations had significant values of Wright’s inbreeding coefficient. The analysis of molecular variance indicated that most of the variation occurred within populations in the three oak species. Resistance analyses showed connectivity among almost all the populations but barrier analysis found genetic breaks that limited gene flow among some populations of the oak species. Even in a heterogeneous environment such as in Oaxaca state, the oak species still have high levels of genetic diversity and landscape connectivity. However, it is necessary to maintain the genetic connectivity through the preservation of natural corridors with forests in good condition, which is necessary to maintain the cohesiveness of the species in the long term. It is also important to protect the centers of species diversity in Oaxaca state located in the subprovinces of Western Oaxacan Mountains and Valleys, Sierra Madre de Oaxaca, and Sierra Madre del Sur because they harbor most of the population genetic diversity and oak species richness, as has been shown in previous studies.},
keywords = {conservation genetics, genetic connectivity, genetic diversity and structure, Mexico, Quercus},
pubstate = {published},
tppubtype = {article}
}
Oaxaca state is one of the main hotspots of biodiversity in Mexico, containing almost 40% of the Mexican vascular flora, due to its high variability in habitat and climatic conditions coupled with high elevations in mountains and low elevations in valleys. We studied the genetic diversity and population structure of Quercus candicans, Quercus crassifolia, and Quercus castanea across their geographical distribution in Oaxaca state to understand how the heterogeneous physiography had driven the genetic diversity and population differentiation in these three oak species. We found high levels of genetic diversity but ca. 40% of the populations had significant values of Wright’s inbreeding coefficient. The analysis of molecular variance indicated that most of the variation occurred within populations in the three oak species. Resistance analyses showed connectivity among almost all the populations but barrier analysis found genetic breaks that limited gene flow among some populations of the oak species. Even in a heterogeneous environment such as in Oaxaca state, the oak species still have high levels of genetic diversity and landscape connectivity. However, it is necessary to maintain the genetic connectivity through the preservation of natural corridors with forests in good condition, which is necessary to maintain the cohesiveness of the species in the long term. It is also important to protect the centers of species diversity in Oaxaca state located in the subprovinces of Western Oaxacan Mountains and Valleys, Sierra Madre de Oaxaca, and Sierra Madre del Sur because they harbor most of the population genetic diversity and oak species richness, as has been shown in previous studies.
2017
Pérez-Crespo, María José; Ornelas, Juan Francisco; González-Rodríguez, Antonio; Ruiz-Sanchez, Eduardo; Vásquez-Aguilar, Antonio Acini; Ramírez-Barahona, Santiago
En: Journal of Biogeography, vol. 44, iss. 11, pp. 2501-2514, 2017, ISSN: 13652699.
Resumen | Enlaces | Etiquetas: Loranthaceae, Mesoamerica, Mexico, Mistletoes, Phylogeography, Pleistocene, Psittacanthus, Trans-Mexican Volcanic Belt
@article{nokey,
title = {Phylogeography and population differentiation in the Psittacanthus calyculatus (Loranthaceae) mistletoe: a complex scenario of climate–volcanism interaction along the Trans-Mexican Volcanic Belt},
author = {María José Pérez-Crespo and Juan Francisco Ornelas and Antonio González-Rodríguez and Eduardo Ruiz-Sanchez and Antonio Acini Vásquez-Aguilar and Santiago Ramírez-Barahona},
doi = {10.1111/jbi.13070},
issn = {13652699},
year = {2017},
date = {2017-01-01},
journal = {Journal of Biogeography},
volume = {44},
issue = {11},
pages = {2501-2514},
publisher = {Blackwell Publishing Ltd},
abstract = {Aim: The formation of the Trans-Mexican Volcanic Belt (TMVB) played an important role in driving inter- and intraspecific diversification at high elevations. However, Pleistocene climate changes and ecological factors might also contribute to plant genetic structuring along the volcanic belt. Here, we analysed phylogeographical patterns of the parrot-mistletoe Psittacanthus calyculatus to determine the relative contribution of these different factors. Location: Trans-Mexican Volcanic Belt. Methods: Using nuclear and chloroplast DNA sequence data for 370 individuals, we investigate the genetic differentiation of 35 populations across the species range. We conducted phylogenetic, population and spatial genetic analyses of P. calyculatus sequences along with ecological niche modelling and Bayesian inference methods to gain insight into the structuring of genetic variation of these populations. Results: Our analyses revealed population structure with three genetic groups corresponding to individuals from Oaxaca and those from the central-eastern and western TMVB regions. A significant genetic signal of demographic expansion, an east-to-west expansion predicted by species distribution modelling, and approximate Bayesian computation analyses strongly supported a scenario of habitat isolation and invasion of TMVB by P. calyculatus during the late-Pleistocene. Main conclusions: The genetic differentiation of P. calyculatus may be explained by the combined effects of (1) geographical isolation linked to the effects of the glacial/interglacial cycles and environmental factors, driving genetic differentiation from congeners into more xeric vegetation and (2) the invasion of TMVB from east to west, suggesting a role for both colonization and glacial/interglacial cycles models.},
keywords = {Loranthaceae, Mesoamerica, Mexico, Mistletoes, Phylogeography, Pleistocene, Psittacanthus, Trans-Mexican Volcanic Belt},
pubstate = {published},
tppubtype = {article}
}
Aim: The formation of the Trans-Mexican Volcanic Belt (TMVB) played an important role in driving inter- and intraspecific diversification at high elevations. However, Pleistocene climate changes and ecological factors might also contribute to plant genetic structuring along the volcanic belt. Here, we analysed phylogeographical patterns of the parrot-mistletoe Psittacanthus calyculatus to determine the relative contribution of these different factors. Location: Trans-Mexican Volcanic Belt. Methods: Using nuclear and chloroplast DNA sequence data for 370 individuals, we investigate the genetic differentiation of 35 populations across the species range. We conducted phylogenetic, population and spatial genetic analyses of P. calyculatus sequences along with ecological niche modelling and Bayesian inference methods to gain insight into the structuring of genetic variation of these populations. Results: Our analyses revealed population structure with three genetic groups corresponding to individuals from Oaxaca and those from the central-eastern and western TMVB regions. A significant genetic signal of demographic expansion, an east-to-west expansion predicted by species distribution modelling, and approximate Bayesian computation analyses strongly supported a scenario of habitat isolation and invasion of TMVB by P. calyculatus during the late-Pleistocene. Main conclusions: The genetic differentiation of P. calyculatus may be explained by the combined effects of (1) geographical isolation linked to the effects of the glacial/interglacial cycles and environmental factors, driving genetic differentiation from congeners into more xeric vegetation and (2) the invasion of TMVB from east to west, suggesting a role for both colonization and glacial/interglacial cycles models.
2014
Maldonado-López, Yurixhi; Cuevas-Reyes, Pablo; González-Rodríguez, Antonio; Pérez-López, Griselda; Acosta-Gómez, Carlos; Oyama, Ken
Relationships among plant genetics, phytochemistry and herbivory patterns in Quercus castanea across a fragmented landscape Artículo de revista
En: Ecological Research, vol. 30, iss. 1, pp. 133-143, 2014, ISSN: 14401703.
Resumen | Enlaces | Etiquetas: Folivores, Leaf miners, Mexico, Microsatellites, Oak
@article{Maldonado-Lopez2014,
title = {Relationships among plant genetics, phytochemistry and herbivory patterns in Quercus castanea across a fragmented landscape},
author = {Yurixhi Maldonado-López and Pablo Cuevas-Reyes and Antonio González-Rodríguez and Griselda Pérez-López and Carlos Acosta-Gómez and Ken Oyama},
doi = {10.1007/s11284-014-1218-2},
issn = {14401703},
year = {2014},
date = {2014-01-01},
journal = {Ecological Research},
volume = {30},
issue = {1},
pages = {133-143},
abstract = {Herbivorous insects respond to the chemical variation of their host plants which, in turn, usually has a genetic component. Therefore, it is expected that individual host plants with similar genotypes will have similar secondary chemistries and herbivore communities. However, natural or anthropogenic environmental variation can also influence secondary chemistry and herbivore abundance and composition. Here, we determined the relationships among plant genetics, phytochemistry, and herbivory levels by leaf chewers and miners in the red oak Quercus castanea, across a fragmented landscape. Ten oak individuals were sampled at each of four sites in the Cuitzeo basin, central Mexico. Two sites were small and fragmented forest patches and two were large and continuous patches. Individuals were genotyped with six nuclear microsatellites, and analyzed chemically to determine foliar concentrations of water, total nonstructural carbohydrates, and secondary compounds. Damage by leaf chewers was higher in the small fragments than in the large fragments. Mantel tests indicated significant correlations of the genetic distance among individuals with their chemical similitude, and also of chemical similitude with damage levels by leaf miners, but not with damage by folivores. There was no direct relationship between genetic distance and herbivory levels by any of the two insect guilds. Our results suggest that variation in concentration of secondary metabolites in Q. castanea has a genetic component and that plant chemistry acts as an intermediate link between plant genes and the community of associated herbivores. However, this effect was only apparent for herbivory by leaf miners, probably because these insects interact more intimately with the host, while free-living leaf chewers may be more responsive to environmental variation.},
keywords = {Folivores, Leaf miners, Mexico, Microsatellites, Oak},
pubstate = {published},
tppubtype = {article}
}
Herbivorous insects respond to the chemical variation of their host plants which, in turn, usually has a genetic component. Therefore, it is expected that individual host plants with similar genotypes will have similar secondary chemistries and herbivore communities. However, natural or anthropogenic environmental variation can also influence secondary chemistry and herbivore abundance and composition. Here, we determined the relationships among plant genetics, phytochemistry, and herbivory levels by leaf chewers and miners in the red oak Quercus castanea, across a fragmented landscape. Ten oak individuals were sampled at each of four sites in the Cuitzeo basin, central Mexico. Two sites were small and fragmented forest patches and two were large and continuous patches. Individuals were genotyped with six nuclear microsatellites, and analyzed chemically to determine foliar concentrations of water, total nonstructural carbohydrates, and secondary compounds. Damage by leaf chewers was higher in the small fragments than in the large fragments. Mantel tests indicated significant correlations of the genetic distance among individuals with their chemical similitude, and also of chemical similitude with damage levels by leaf miners, but not with damage by folivores. There was no direct relationship between genetic distance and herbivory levels by any of the two insect guilds. Our results suggest that variation in concentration of secondary metabolites in Q. castanea has a genetic component and that plant chemistry acts as an intermediate link between plant genes and the community of associated herbivores. However, this effect was only apparent for herbivory by leaf miners, probably because these insects interact more intimately with the host, while free-living leaf chewers may be more responsive to environmental variation.
Hernández-Calderón, Erasto; Méndez-Alonzo, Rodrigo; Martínez-Cruz, Juan; González-Rodríguez, Antonio; Oyama, Ken
Altitudinal changes in tree leaf and stem functional diversity in a semi-tropical mountain generic
2014.
Resumen | Enlaces | Etiquetas: Altitude, Community assembly, Community-weighted mean, Functional traits, Huber value, Mexico, Tree allometry, Tree height
@generic{Hernandez-Calderon2014,
title = {Altitudinal changes in tree leaf and stem functional diversity in a semi-tropical mountain},
author = {Erasto Hernández-Calderón and Rodrigo Méndez-Alonzo and Juan Martínez-Cruz and Antonio González-Rodríguez and Ken Oyama},
doi = {10.1111/jvs.12158},
issn = {16541103},
year = {2014},
date = {2014-01-01},
journal = {Journal of Vegetation Science},
volume = {25},
issue = {4},
pages = {955-966},
abstract = {Question: Along an altitudinal gradient of 2000 m in a semi-tropical mountain, we explored the relation between tree specific diversity and community functional composition by studying variations in tree allometry, stem and leaf functional traits, and their relationship with temperature and precipitation. Location: Tequila Volcano, Jalisco, Mexico (20°48′ N, 103°51′ W). Methods: We surveyed tree specific diversity, five forest structural parameters and six functional traits in ten horizontal transects (50-75 m in length) located every 200 m along a 2000-m gradient (from 800 to 2800 m a.s.l.). We calculated alpha and beta diversity, and quantified the community-weighted means for wood and bark density, Huber value (sapwood to leaf area ratio), leaf area, leaf dry mass content and leaf mass per unit area. The patterns of association were explored using Pearson correlations, and summarized using PCA. Results: Alpha diversity was independent of altitude, and species turnover was almost complete between consecutive transects. Altitude (and its associated abiotic factors, temperature and precipitation) were highly correlated with functional traits. Maximum tree height, total basal area and the community-weighted mean values for leaf mass per unit area, leaf dry mass content, and the Huber values were positively correlated with altitude, and the opposite was found for the number of basal stems. Stem and leaf trait values were correlated along the altitudinal gradient. Conclusions: Altitude imposes environmental filters at the community scale that determine a high species replacement. Stem and leaf traits were correlated along the gradient; trees at higher altitudes were taller with a single stem, higher density of wood and bark, and leaves with higher leaf mass per area and dry mass content than in the low-altitude sites. These results suggest the consistency of a fast-slow acquisitive trade-off across environments, tending to promote slow acquisition and high longevity at higher altitudes. © 2014 International Association for Vegetation Science.},
keywords = {Altitude, Community assembly, Community-weighted mean, Functional traits, Huber value, Mexico, Tree allometry, Tree height},
pubstate = {published},
tppubtype = {generic}
}
Question: Along an altitudinal gradient of 2000 m in a semi-tropical mountain, we explored the relation between tree specific diversity and community functional composition by studying variations in tree allometry, stem and leaf functional traits, and their relationship with temperature and precipitation. Location: Tequila Volcano, Jalisco, Mexico (20°48′ N, 103°51′ W). Methods: We surveyed tree specific diversity, five forest structural parameters and six functional traits in ten horizontal transects (50-75 m in length) located every 200 m along a 2000-m gradient (from 800 to 2800 m a.s.l.). We calculated alpha and beta diversity, and quantified the community-weighted means for wood and bark density, Huber value (sapwood to leaf area ratio), leaf area, leaf dry mass content and leaf mass per unit area. The patterns of association were explored using Pearson correlations, and summarized using PCA. Results: Alpha diversity was independent of altitude, and species turnover was almost complete between consecutive transects. Altitude (and its associated abiotic factors, temperature and precipitation) were highly correlated with functional traits. Maximum tree height, total basal area and the community-weighted mean values for leaf mass per unit area, leaf dry mass content, and the Huber values were positively correlated with altitude, and the opposite was found for the number of basal stems. Stem and leaf trait values were correlated along the altitudinal gradient. Conclusions: Altitude imposes environmental filters at the community scale that determine a high species replacement. Stem and leaf traits were correlated along the gradient; trees at higher altitudes were taller with a single stem, higher density of wood and bark, and leaves with higher leaf mass per area and dry mass content than in the low-altitude sites. These results suggest the consistency of a fast-slow acquisitive trade-off across environments, tending to promote slow acquisition and high longevity at higher altitudes. © 2014 International Association for Vegetation Science.
2011
Gugger, Paul F.; Gonzalez-Rodriguez, Antonio; Rodriguez-Correa, Hernando; Sugita, Shinya; Cavender-Bares, Jeannine
Southward Pleistocene migration of Douglas-fir into Mexico: Phylogeography, ecological niche modeling, and conservation of 'rear edge' populations Artículo de revista
En: New Phytologist, vol. 189, iss. 4, pp. 1185-1199, 2011, ISSN: 0028646X.
Resumen | Enlaces | Etiquetas: CpDNA, CpSSR, ecological niche modeling, Mexico, MtDNA, Phylogeography, Pseudotsuga menziesii, Rear edge
@article{Gugger2011,
title = {Southward Pleistocene migration of Douglas-fir into Mexico: Phylogeography, ecological niche modeling, and conservation of 'rear edge' populations},
author = {Paul F. Gugger and Antonio Gonzalez-Rodriguez and Hernando Rodriguez-Correa and Shinya Sugita and Jeannine Cavender-Bares},
doi = {10.1111/j.1469-8137.2010.03559.x},
issn = {0028646X},
year = {2011},
date = {2011-01-01},
journal = {New Phytologist},
volume = {189},
issue = {4},
pages = {1185-1199},
abstract = {Poleward Pleistocene plant migration has been an important process structuring modern temperate and boreal plant communities, but the contribution of equatorward migration remains poorly understood. Paleobotanical evidence suggests Miocene or Pleistocene origin for temperate 'sky island' plant taxa in Mexico. These 'rear edge' populations situated in a biodiversity hotspot may be an important reserve of genetic diversity in changing climates. We used mtDNA sequences, cpDNA sequences and chloroplast microsatellites to test hypotheses of Miocene vs Pleistocene colonization of temperate Douglas-fir in Mexico, explore geographic patterns of molecular variation in relation to Pleistocene climate history using ecological niche models, and assess the taxonomic and conservation implications. We found strong evidence for Pleistocene divergence of Douglas-fir in Mexico (958 thousand yr before present (ka) with the 90% highest posterior density interval ranging from 1.6 million yr before present (Ma) to 491ka), consistent with the southward Pleistocene migration hypothesis. Genetic diversity was high and strongly partitioned among populations. Spatial patterns of molecular variation and ecological niche models suggest a complex late Pleistocene history involving periods of isolation and expansion along mountain corridors. These results highlight the importance of southward Pleistocene migration in establishing modern high-diversity plant communities and provide critical insights into proposals to conserve the unique biodiversity of Mexican Douglas-fir and associated taxa. © 2010 The Authors. New Phytologist © 2010 New Phytologist Trust.},
keywords = {CpDNA, CpSSR, ecological niche modeling, Mexico, MtDNA, Phylogeography, Pseudotsuga menziesii, Rear edge},
pubstate = {published},
tppubtype = {article}
}
Poleward Pleistocene plant migration has been an important process structuring modern temperate and boreal plant communities, but the contribution of equatorward migration remains poorly understood. Paleobotanical evidence suggests Miocene or Pleistocene origin for temperate 'sky island' plant taxa in Mexico. These 'rear edge' populations situated in a biodiversity hotspot may be an important reserve of genetic diversity in changing climates. We used mtDNA sequences, cpDNA sequences and chloroplast microsatellites to test hypotheses of Miocene vs Pleistocene colonization of temperate Douglas-fir in Mexico, explore geographic patterns of molecular variation in relation to Pleistocene climate history using ecological niche models, and assess the taxonomic and conservation implications. We found strong evidence for Pleistocene divergence of Douglas-fir in Mexico (958 thousand yr before present (ka) with the 90% highest posterior density interval ranging from 1.6 million yr before present (Ma) to 491ka), consistent with the southward Pleistocene migration hypothesis. Genetic diversity was high and strongly partitioned among populations. Spatial patterns of molecular variation and ecological niche models suggest a complex late Pleistocene history involving periods of isolation and expansion along mountain corridors. These results highlight the importance of southward Pleistocene migration in establishing modern high-diversity plant communities and provide critical insights into proposals to conserve the unique biodiversity of Mexican Douglas-fir and associated taxa. © 2010 The Authors. New Phytologist © 2010 New Phytologist Trust.
Gugger, Paul F.; Gonzalez-Rodriguez, Antonio; Rodriguez-Correa, Hernando; Sugita, Shinya; Cavender-Bares, Jeannine
Southward Pleistocene migration of Douglas-fir into Mexico: Phylogeography, ecological niche modeling, and conservation of 'rear edge' populations Artículo de revista
En: New Phytologist, vol. 189, iss. 4, pp. 1185-1199, 2011, ISSN: 0028646X.
Resumen | Enlaces | Etiquetas: CpDNA, CpSSR, ecological niche modeling, Mexico, MtDNA, Phylogeography, Pseudotsuga menziesii, Rear edge
@article{Gugger2011b,
title = {Southward Pleistocene migration of Douglas-fir into Mexico: Phylogeography, ecological niche modeling, and conservation of 'rear edge' populations},
author = {Paul F. Gugger and Antonio Gonzalez-Rodriguez and Hernando Rodriguez-Correa and Shinya Sugita and Jeannine Cavender-Bares},
doi = {10.1111/j.1469-8137.2010.03559.x},
issn = {0028646X},
year = {2011},
date = {2011-01-01},
journal = {New Phytologist},
volume = {189},
issue = {4},
pages = {1185-1199},
abstract = {Poleward Pleistocene plant migration has been an important process structuring modern temperate and boreal plant communities, but the contribution of equatorward migration remains poorly understood. Paleobotanical evidence suggests Miocene or Pleistocene origin for temperate 'sky island' plant taxa in Mexico. These 'rear edge' populations situated in a biodiversity hotspot may be an important reserve of genetic diversity in changing climates. We used mtDNA sequences, cpDNA sequences and chloroplast microsatellites to test hypotheses of Miocene vs Pleistocene colonization of temperate Douglas-fir in Mexico, explore geographic patterns of molecular variation in relation to Pleistocene climate history using ecological niche models, and assess the taxonomic and conservation implications. We found strong evidence for Pleistocene divergence of Douglas-fir in Mexico (958 thousand yr before present (ka) with the 90% highest posterior density interval ranging from 1.6 million yr before present (Ma) to 491ka), consistent with the southward Pleistocene migration hypothesis. Genetic diversity was high and strongly partitioned among populations. Spatial patterns of molecular variation and ecological niche models suggest a complex late Pleistocene history involving periods of isolation and expansion along mountain corridors. These results highlight the importance of southward Pleistocene migration in establishing modern high-diversity plant communities and provide critical insights into proposals to conserve the unique biodiversity of Mexican Douglas-fir and associated taxa. © 2010 The Authors. New Phytologist © 2010 New Phytologist Trust.},
keywords = {CpDNA, CpSSR, ecological niche modeling, Mexico, MtDNA, Phylogeography, Pseudotsuga menziesii, Rear edge},
pubstate = {published},
tppubtype = {article}
}
Poleward Pleistocene plant migration has been an important process structuring modern temperate and boreal plant communities, but the contribution of equatorward migration remains poorly understood. Paleobotanical evidence suggests Miocene or Pleistocene origin for temperate 'sky island' plant taxa in Mexico. These 'rear edge' populations situated in a biodiversity hotspot may be an important reserve of genetic diversity in changing climates. We used mtDNA sequences, cpDNA sequences and chloroplast microsatellites to test hypotheses of Miocene vs Pleistocene colonization of temperate Douglas-fir in Mexico, explore geographic patterns of molecular variation in relation to Pleistocene climate history using ecological niche models, and assess the taxonomic and conservation implications. We found strong evidence for Pleistocene divergence of Douglas-fir in Mexico (958 thousand yr before present (ka) with the 90% highest posterior density interval ranging from 1.6 million yr before present (Ma) to 491ka), consistent with the southward Pleistocene migration hypothesis. Genetic diversity was high and strongly partitioned among populations. Spatial patterns of molecular variation and ecological niche models suggest a complex late Pleistocene history involving periods of isolation and expansion along mountain corridors. These results highlight the importance of southward Pleistocene migration in establishing modern high-diversity plant communities and provide critical insights into proposals to conserve the unique biodiversity of Mexican Douglas-fir and associated taxa. © 2010 The Authors. New Phytologist © 2010 New Phytologist Trust.
2010
Peñaloza-Ramírez, Juan Manuel; González-Rodríguez, Antonio; Mendoza-Cuenca, Luis; Caron, Henri; Kremer, Antoine; Oyama, Ken
Interspecific gene flow in a multispecies oak hybrid zone in the Sierra Tarahumara of Mexico. Artículo de revista
En: Annals of botany, vol. 105, iss. 3, pp. 389-399, 2010, ISSN: 10958290.
Resumen | Enlaces | Etiquetas: altitudinal cline, Hybridization, introgression, leaf shape variation, Mexico, nuclear microsatellites, quercus hypoleucoides, quercus scytophylla, quercus sideroxyla, red oak
@article{Penaloza-Ramirez2010,
title = {Interspecific gene flow in a multispecies oak hybrid zone in the Sierra Tarahumara of Mexico.},
author = {Juan Manuel Peñaloza-Ramírez and Antonio González-Rodríguez and Luis Mendoza-Cuenca and Henri Caron and Antoine Kremer and Ken Oyama},
doi = {10.1093/aob/mcp301},
issn = {10958290},
year = {2010},
date = {2010-01-01},
journal = {Annals of botany},
volume = {105},
issue = {3},
pages = {389-399},
abstract = {BACKGROUND AND AIMS: Interspecific gene flow can occur in many combinations among species within the genus Quercus, but simultaneous hybridization among more than two species has been rarely analysed. The present study addresses the genetic structure and morphological variation in a triple hybrid zone formed by Q. hypoleucoides, Q. scytophylla and Q. sideroxyla in north-western Mexico. METHODS: A total of 247 trees from ten reference and 13 presumed intermediate populations were characterized using leaf shape variation and geometric morphometrics, and seven nuclear microsatellites as genetic markers. Discriminant function analysis was performed for leaf shape variation, and estimates of genetic diversity and structure, and individual Bayesian genetic assignments were obtained. KEY RESULTS: Reference populations formed three completely distinct groups according to discriminant function analysis based on the morphological data, and showed low, but significant, genetic differentiation. Populations from the zone of contact contained individuals morphologically intermediate between pairs of species in different combinations, or even among the three species. The Bayesian admixture analysis found that three main genetic clusters best fitted the data, with good correspondence of reference populations of each species to one of the genetic clusters, but various degrees of admixture evidenced in populations from the contact area. CONCLUSIONS: The three oak species have formed a complex hybrid zone that is geographically structured as a mosaic, and comprising a wide range of genotypes, including hybrids between different species pairs, backcrosses and probable triple hybrids.},
keywords = {altitudinal cline, Hybridization, introgression, leaf shape variation, Mexico, nuclear microsatellites, quercus hypoleucoides, quercus scytophylla, quercus sideroxyla, red oak},
pubstate = {published},
tppubtype = {article}
}
BACKGROUND AND AIMS: Interspecific gene flow can occur in many combinations among species within the genus Quercus, but simultaneous hybridization among more than two species has been rarely analysed. The present study addresses the genetic structure and morphological variation in a triple hybrid zone formed by Q. hypoleucoides, Q. scytophylla and Q. sideroxyla in north-western Mexico. METHODS: A total of 247 trees from ten reference and 13 presumed intermediate populations were characterized using leaf shape variation and geometric morphometrics, and seven nuclear microsatellites as genetic markers. Discriminant function analysis was performed for leaf shape variation, and estimates of genetic diversity and structure, and individual Bayesian genetic assignments were obtained. KEY RESULTS: Reference populations formed three completely distinct groups according to discriminant function analysis based on the morphological data, and showed low, but significant, genetic differentiation. Populations from the zone of contact contained individuals morphologically intermediate between pairs of species in different combinations, or even among the three species. The Bayesian admixture analysis found that three main genetic clusters best fitted the data, with good correspondence of reference populations of each species to one of the genetic clusters, but various degrees of admixture evidenced in populations from the contact area. CONCLUSIONS: The three oak species have formed a complex hybrid zone that is geographically structured as a mosaic, and comprising a wide range of genotypes, including hybrids between different species pairs, backcrosses and probable triple hybrids.
2004
González-Rodríguez, A.; Bain, J. F.; Golden, J. L.; Oyama, K.
Chloroplast DNA variation in the Quercus affinis-Q. laurina complex in Mexico: Geographical structure and associations with nuclear and morphological variation Artículo de revista
En: Molecular Ecology, vol. 13, iss. 11, pp. 3467-3476, 2004, ISSN: 09621083.
Resumen | Enlaces | Etiquetas: Chloroplast dna, Geographical structure, Hybridization, Mexico, Population history, Quercus
@article{Gonzalez-Rodriguez2004,
title = {Chloroplast DNA variation in the Quercus affinis-Q. laurina complex in Mexico: Geographical structure and associations with nuclear and morphological variation},
author = {A. González-Rodríguez and J. F. Bain and J. L. Golden and K. Oyama},
doi = {10.1111/j.1365-294X.2004.02344.x},
issn = {09621083},
year = {2004},
date = {2004-01-01},
journal = {Molecular Ecology},
volume = {13},
issue = {11},
pages = {3467-3476},
abstract = {The geographical distribution of chloroplast DNA (cpDNA) variation in 39 populations of two hybridizing Mexican red oaks, Quercus affinis and Q. laurina, was investigated using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Six haplotypes were identified. Of these, two (H1 and H4), separated by four mutations, had high frequencies (58 and 23% of the individuals, respectively) and were present across the whole geographical range of both species, often co occurring in the same populations. The other four haplotypes were rare, geographically restricted, and are probably derived from the two frequent haplotypes. Latitudinal or other clinal patterns in diversity levels or haplotype composition of populations were not apparent. The pattern of haplotype distribution was characterized by some mosaicism, with contrasting populations often situated in proximity. Average within-population diversity (hS = 0.299) and population differentiation (GST = 0.499) were, respectively, higher and lower than values reported in previous studies of oak species. There was evidence for phylogeographical structure, as indicated by NST (0.566) being significantly higher than GST. Haplotypic variation was largely species-independent, although some very weak associations were detected between haplotypes H1 and H4 and morphological and nuclear molecular variation correspondingly characterizing Q. affinis and Q. laurina. These oaks probably did not experience a marked restriction to one or a few particular subregions of their present range during the last glacial cycle. It is more likely that substantial populations persisted throughout several episodes of climatic change, but experienced recurrent latitudinal and altitudinal migrations which may have caused the widespread distribution of haplotypes H1 and H4 and frequent intermixing of populations.},
keywords = {Chloroplast dna, Geographical structure, Hybridization, Mexico, Population history, Quercus},
pubstate = {published},
tppubtype = {article}
}
The geographical distribution of chloroplast DNA (cpDNA) variation in 39 populations of two hybridizing Mexican red oaks, Quercus affinis and Q. laurina, was investigated using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Six haplotypes were identified. Of these, two (H1 and H4), separated by four mutations, had high frequencies (58 and 23% of the individuals, respectively) and were present across the whole geographical range of both species, often co occurring in the same populations. The other four haplotypes were rare, geographically restricted, and are probably derived from the two frequent haplotypes. Latitudinal or other clinal patterns in diversity levels or haplotype composition of populations were not apparent. The pattern of haplotype distribution was characterized by some mosaicism, with contrasting populations often situated in proximity. Average within-population diversity (hS = 0.299) and population differentiation (GST = 0.499) were, respectively, higher and lower than values reported in previous studies of oak species. There was evidence for phylogeographical structure, as indicated by NST (0.566) being significantly higher than GST. Haplotypic variation was largely species-independent, although some very weak associations were detected between haplotypes H1 and H4 and morphological and nuclear molecular variation correspondingly characterizing Q. affinis and Q. laurina. These oaks probably did not experience a marked restriction to one or a few particular subregions of their present range during the last glacial cycle. It is more likely that substantial populations persisted throughout several episodes of climatic change, but experienced recurrent latitudinal and altitudinal migrations which may have caused the widespread distribution of haplotypes H1 and H4 and frequent intermixing of populations.