Publicaciones

@article{Martinez-Diaz2015,

title = {Geographic structure of chemical variation in wild populations of the fuel crop Jatropha curcas L. in Mexico},

author = {Yesenia Martínez-Díaz and Antonio González-Rodríguez and Guillermo Delgado-Lamas and Francisco J. Espinosa-García},

url = {http://dx.doi.org/10.1016/j.indcrop.2015.04.049},

doi = {10.1016/j.indcrop.2015.04.049},

issn = {09266690},

year  = {2015},

date = {2015-01-01},

journal = {Industrial Crops and Products},

volume = {74},

pages = {63-68},

publisher = {Elsevier B.V.},

abstract = {Jatropha curcas L. (Euphorbiaceae) is a shrub that produces seeds with a high oil content that can be converted to biodiesel. Some studies have shown that this plant contains phytochemicals that cause adverse effects on herbivores; however, it is not known whether the phytochemical variation is geographically structured and, in turn, if it is associated with herbivory intensity. This knowledge would enable the selection of individuals with adequate chemical variation to decrease the herbivory of this plant. With this objective, total foliar content of saponins, trypsin inhibitors, phytic acids, and phenols were analyzed and herbivory quantified in eight wild populations of J. curcas in Chiapas, Michoacán, and Veracruz, Mexico. Using principal components analysis (PCA), the content of phenols, saponins, trypsin inhibitors, and phytic acids grouped individuals to their state or frequently to their population. A multiple linear regression model considering total phytochemical content, altitude and precipitation, explained herbivory intensity (multiple adjusted R^{2}=0.62). The concentration of trypsin inhibitors (par. corr.=0.51, P<0.0001) and altitude (par. corr.=0.769, P<0.0001) were positively associated with herbivory, whereas the concentration of phytic acid (par. corr.=-0.299, P<0.019) and precipitation (par. corr.=-0.503, P<0.0001) were negatively associated. It can be concluded that phytochemical variation is structured geographically at the local level and that herbivory intensity is associated with the total phytochemical content, precipitation, and altitude.},

keywords = {Fuel crops, Geographic structure of phytochemical variation, Jatropha curcas plantations, Phytic acid, Trypsin inhibitors},

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{Cavender-Bares2015,

title = {Phylogeny and biogeography of the american live oaks (Quercus subsection Virentes): A genomic and population genetics approach},

author = {Jeannine Cavender-Bares and Antonio González-Rodríguez and Deren A. R. Eaton and Andrew A. L. Hipp and Anne Beulke and Paul S. Manos},

doi = {10.1111/mec.13269},

issn = {1365294X},

year  = {2015},

date = {2015-01-01},

journal = {Molecular Ecology},

volume = {24},

issue = {14},

pages = {3668-3687},

abstract = {The nature and timing of evolution of niche differentiation among closely related species remains an important question in ecology and evolution. The American live oak clade, Virentes, which spans the unglaciated temperate and tropical regions of North America and Mesoamerica, provides an instructive system in which to examine speciation and niche evolution. We generated a fossil-calibrated phylogeny of Virentes using RADseq data to estimate divergence times and used nuclear microsatellites, chloroplast sequences and an intron region of nitrate reductase (NIA-i3) to examine genetic diversity within species, rates of gene flow among species and ancestral population size of disjunct sister species. Transitions in functional and morphological traits associated with ecological and climatic niche axes were examined across the phylogeny. We found the Virentes to be monophyletic with three subclades, including a southwest clade, a southeastern US clade and a Central American/Cuban clade. Despite high leaf morphological variation within species and transpecific chloroplast haplotypes, RADseq and nuclear SSR data showed genetic coherence of species. We estimated a crown date for Virentes of 11 Ma and implicated the formation of the Sea of Cortes in a speciation event ~5 Ma. Tree height at maturity, associated with fire tolerance, differs among the sympatric species, while freezing tolerance appears to have diverged repeatedly across the tropical-temperate divide. Sympatric species thus show evidence of ecological niche differentiation but share climatic niches, while allopatric and parapatric species conserve ecological niches, but diverge in climatic niches. The mode of speciation and/or degree of co-occurrence may thus influence which niche axis plants diverge along.},

keywords = {Conservation, Ecological and climatic niches, Fossil calibration, Genomic data, introgression, Phylogeography, RADseq, Sea of Cortés, Virentes},

pubstate = {published},

tppubtype = {article}

}

@article{Chavez-Vergara2015,

title = {Foliar nutrient resorption constrains soil nutrient transformations under two native oak species in a temperate deciduous forest in Mexico},

author = {Bruno M. Chávez-Vergara and Antonio González-Rodríguez and Jorge D. Etchevers and Ken Oyama and Felipe García-Oliva},

doi = {10.1007/s10342-015-0891-1},

issn = {16124669},

year  = {2015},

date = {2015-01-01},

journal = {European Journal of Forest Research},

volume = {134},

issue = {5},

pages = {803-817},

abstract = {Foliar nutrient resorption (FNR) is a key process in the dynamics of nutrients in a forest ecosystem. Along with other factors, FNR regulates the chemical composition of the forest floor and, consequently, the rates of organic matter decomposition and soil nutrient availability. The main objective of the present study was to examine the effect of FNR of two deciduous oak species (Quercus castanea and Q. deserticola) in the litter and soil nutrient dynamics, in addition to analyze whether the interaction between two species was positive (synergistic) or negative (antagonistic) through the mixed litter from two species. For this purpose, the nutrient concentration of green leaves, litterfall, litter and soil was measured, as well as soil microbial activity. These measurements were taken in isolated stands with the presence of one of the oak species and stands with the two oak species mixed. Quercus deserticola, with lower FNR, produced litter with a higher N concentration, which apparently enhancing microbial activity in the forest floor litter and increased nutrient transformations and soil fertility. In contrast, Q. castanea has a higher FNR and produced litter with a lower nutrient concentration. The microbial soil community associated with Q. castanea must therefore invest more energy in metabolic processes at the expense of biomass growth. However, forest floor nutrient transformations were more intense and soil fertility increased in areas where both species intermix; in this case, the latter species received the rich-nutrient litterfall of Q. deserticola. These results suggest a strong footprint of species traits on microbial activities and soil nutrient transformations.},

keywords = {Biogeochemistry, Functional interactions, Microbial transformations, Quercus, Species footprint, Temperate deciduous forest},

pubstate = {published},

tppubtype = {article}

}

@article{Letelier2015,

title = {Isolation and Characterization of 12 Microsatellite Loci in Soapbark, Quillaja saponaria (Quillajaceae)},

author = {Luis Letelier and Nick Harvey and Aly Valderrama and Alexandra Stoll and Antonio González-Rodríguez},

doi = {10.3732/apps.1500024},

issn = {1537-2197},

year  = {2015},

date = {2015-01-01},

journal = {Applications in Plant Sciences},

volume = {3},

issue = {5},

pages = {1500024},

abstract = {Premise of the study: Microsatellite primers were developed for the 

endemic Chilean tree Quillaja saponaria (Quillajaceae), a common member 

of the sclerophyllous Mediterranean forest, to investigate intraspecific 

patterns of genetic diversity and structure. 

Methods and Results: Using an enriched library, 12 polymorphic 

microsatellite loci were developed in Q. saponaria. All loci consisted 

of dinucleotide repeats. The average number of alleles per locus was 5.3 

(2-13), with a total of 64 alleles recorded in 39 individuals from three 

populations. 

Conclusions: The microsatellite markers described here are the first 

characterized for Q. saponaria. The polymorphic loci will be useful in 

studies of genetic diversity and genetic population differentiation in 

natural populations of this species.},

keywords = {chile, Microsatellites, quillaja saponaria, quillajaceae, soapbark},

pubstate = {published},

tppubtype = {article}

}

@article{Parra2015,

title = {Spatial distribution of genetic variation of Stenocereus pruinosus (Otto) Buxb. in Mexico: analysing evidence on the origins of its domestication},

author = {Fabiola Parra and Alejandro Casas and Víctor Rocha and Antonio Gonzàlez-Rodríguez and Salvador Arias-Montes and Hernando Rodríguez-Correa and Janet Tovar},

doi = {10.1007/s10722-014-0199-x},

issn = {15735109},

year  = {2015},

date = {2015-01-01},

journal = {Genetic Resources and Crop Evolution},

volume = {62},

issue = {6},

pages = {893-912},

abstract = {We studied populations of Stenocereus pruinosus throughout Mexico, a species important for its edible fruit. The Tehuacán Valley is setting of ancient and the currently most active management of S. pruinosus; we hypothesized Tehuacán as the original area of domestication of S. pruinosus and expected to find there its highest genetic variation and original source of genes of cultivated plants. Through nuclear microsatellite loci we studied spatial distribution of genetic variation and population differentiation. We sampled wild and managed populations of the Central-western (Tehuacán, Central Valleys and Tehuantepec, Oaxaca), north-eastern (Huasteca) and south-eastern (Chiapas) regions. Differences among regions and populations were compared through homogeneity and exact test for FIS , AMOVA, Bayesian analysis, and genetic barriers. A niche analysis allowed corroborating taxonomic identity of populations. The highest genetic diversity was in Tehuantepec (HE = 0.841), decreasing towards the extremes of distribution (HE = 0.242 in Huasteca},

keywords = {Centre of origin, Columnar cacti, domestication, Genetic resources conservation, Mesoamerica, Stenocereus pruinosus},

pubstate = {published},

tppubtype = {article}

}

@article{Sanabria-Urban2015,

title = {Body size adaptations to altitudinal climatic variation in neotropical grasshoppers of the genus sphenarium (orthoptera: Pyrgomorphidae)},

author = {Salomón Sanabria-Urbán and Hojun Song and Ken Oyama and Antonio González-Rodríguez and Martin A. Serrano-Meneses and Raúl Cueva Del Castillo},

doi = {10.1371/journal.pone.0145248},

issn = {19326203},

year  = {2015},

date = {2015-01-01},

journal = {PLoS ONE},

volume = {10},

issue = {12},

pages = {1-24},

abstract = {Altitudinal clines in body size can result from the effects of natural and sexual selection on growth rates and developing times in seasonal environments. Short growing and reproductive seasons constrain the body size that adults can attain and their reproductive success. Little is known about the effects of altitudinal climatic variation on the diversification of Neotropical insects. In central Mexico, in addition to altitude, highly heterogeneous topography generates diverse climates that can occur even at the same latitude. Altitudinal variation and heterogeneous topography open an opportunity to test the relative impact of climatic variation on body size adaptations. In this study, we investigated the relationship between altitudinal climatic variation and body size, and the divergence rates of sexual size dimorphism (SSD) in Neotropical grasshoppers of the genus Sphenarium using a phylogenetic comparative approach. In order to distinguish the relative impact of natural and sexual selection on the diversification of the group, we also tracked the altitudinal distribution of the species and trends of both body size and SSD on the phylogeny of Sphenarium. The correlative evidence suggests no relationship between altitude and body size. However, larger species were associated with places having a warmer winter season in which the temporal window for development and reproduction can be longer. Nonetheless, the largest species were also associated with highly seasonal environments. Moreover, large body size and high levels of SSD have evolved independently several times throughout the history of the group and male body size has experienced a greater evolutionary divergence than females. These lines of evidence suggest that natural selection, associated with seasonality and sexual selection, on maturation time and body size could have enhanced the diversification of this insect group.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Eaton2015,

title = {Historical introgression among the American live oaks and the comparative nature of tests for introgression},

author = {Deren A. R. Eaton and Andrew L. Hipp and Antonio González-Rodríguez and Jeannine Cavender-Bares},

doi = {10.1111/evo.12758},

issn = {15585646},

year  = {2015},

date = {2015-01-01},

journal = {Evolution},

volume = {69},

issue = {10},

pages = {2587-2601},

abstract = {Introgressive hybridization challenges the concepts we use to define species and infer phylogenetic relationships. Methods for inferring historical introgression from the genomes of extant species, such as ABBA-BABA tests, are widely used, however, their results can be easily misinterpreted. Because these tests are inherently comparative, they are sensitive to the effects of missing data (unsampled species) and nonindependence (hierarchical relationships among species). We demonstrate this using genomic RADseq data sampled from all extant species in the American live oaks (Quercus series Virentes), a group notorious for hybridization. By considering all species and their phylogenetic relationships, we were able to distinguish true hybridizing lineages from those that falsely appear admixed. Six of seven species show evidence of admixture, often with multiple other species, but which is explained by introgression among a few related lineages occurring in close proximity. We identify the Cuban oak as the most admixed lineage and test alternative scenarios for its origin. The live oaks form a continuous ring-like distribution around the Gulf of Mexico, connected in Cuba, across which they could effectively exchange alleles. However, introgression appears highly localized, suggesting that oak species boundaries and their geographic ranges have remained relatively stable over evolutionary time.},

keywords = {Admixture, Cuba, Hybridization, phylogeny, Quercus, RADseq},

pubstate = {published},

tppubtype = {article}

}

@article{Rodriguez-Correa2015,

title = {How are oaks distributed in the neotropics? A perspective from species turnover, areas of endemism, and climatic niches},

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

doi = {10.1086/679904},

issn = {10585893},

year  = {2015},

date = {2015-01-01},

journal = {International Journal of Plant Sciences},

volume = {176},

issue = {3},

pages = {222-231},

abstract = {Premise of research. The most important diversity hot spot of genus Quercus (Fagaceae) in America is situated in southern Mexico. From this area down to the Colombian Andes, oak species diversity decreases considerably, but the pattern of species distribution and turnover has not been analyzed. This study aimed at determining geographical patterns of species turnover, species distribution, and endemism for Neotropical Quercus species. Methodology. Occurrence records for 58 oak species belonging to the Quercus and Lobatae sections were obtained. Patterns of species turnover were determined by comparing species composition among latitudinal/ longitudinal units. Areas of endemism were determined using weighted networks. The potential distribution of oak species was determined using ecological niche models. Finally, a principal component analysis was used to identify changes in the oak species’ ecological niche across areas. Pivotal results. The species composition analysis indicated that the Tehuantepec Isthmus, the Nicaraguan Depression, and the Panamanian Isthmus represent species turnover points. Nine areas of endemism were recovered, distributed through mountainous ranges from Mexico to Costa Rica. Most of these areas were delimited by the species turnover points detected. Ecological niche modeling indicated that the turnover points represent areas with low climatic suitability for most oak species and represent discontinuities in the distribution of Quercus. Niche comparisons suggest niche differentiation among species distributed in different areas of endemism or on opposite sides of turnover points. Conclusions. The results indicate that the Tehuantepec Isthmus, the Nicaraguan Depression, and the Panamanian Isthmus have acted as important barriers to the dispersal of oak species, influencing species diversity, biogeographic patterns, and niche divergence.},

keywords = {biogeography, Distribution, Diversity, Neotropical trees, Quercus},

pubstate = {published},

tppubtype = {article}

}

@article{Figueredo2014,

title = {Morphological variation, management and domestication of 'maguey alto' (Agave inaequidens) and 'maguey manso' (A. hookeri) in Michoacán, México},

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

doi = {10.1186/1746-4269-10-66},

issn = {17464269},

year  = {2014},

date = {2014-01-01},

journal = {Journal of Ethnobiology and Ethnomedicine},

volume = {10},

issue = {1},

pages = {1-12},

abstract = {Background: Agave inaequidens and A. hookeri are anciently used species for producing the fermented beverage 'pulque', food and fiber in central Mexico. A. inaequidens is wild and cultivated and A. hookeri only cultivated, A. inaequidens being its putative wild relative. We analysed purposes and mechanisms of artificial selection and phenotypic divergences between wild and managed populations of A. inaequidens and between them and A. hookeri, hypothesizing phenotypic divergence between wild and domesticated populations of A. inaequidens in characters associated to domestication, and that A. hookeri would be phenotypically similar to cultivated A. inaequidens. Methods: We studied five wild and five cultivated populations of A. inaequidens, and three cultivated populations of A. hookeri. We interviewed agave managers documenting mechanisms of artificial selection, and measured 25 morphological characters. Morphological similarity and differentiation among plants and populations were analysed through multivariate methods and ANOVAs. Results: People recognized 2-8 variants of A. inaequidens; for cultivation they select young plants collected in wild areas recognized as producing the best quality mescal agaves. Also, they collect seeds of the largest and most vigorous plants, sowing seeds in plant beds and then transplanting the most vigorous plantlets into plantations. Multivariate methods classified separately the wild and cultivated populations of A. inaequidens and these from A. hookeri, mainly because of characters related with plant and teeth size. The cultivated plants of A. inaequidens are significantly bigger with larger teeth than wild plants. A. hookeri are also significatly bigger plants with larger leaves but lower teeth density and size than A. inaequidens. Some cultivated plants of A. inaequidens were classified as A. hookeri, and nearly 10% of A. hookeri as cultivated A. inaequidens. Wild and cultivated populations of A. inaequidens differed in 13 characters, whereas A. hookeri differed in 23 characters with wild populations and only in 6 characters with cultivated populations of A. inaequidens. Conclusions: Divergence between wild and cultivated populations of A. inaequidens reflect artificial selection. A. hookeri is similar to the cultivated A. inaequidens, which supports the hypothesis that A. hookeri could be the extreme of a domestication gradient of a species complex.},

keywords = {domestication, Mescal agave, Phenotypic variation, Plant management, Pulque},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Cuevas-Reyes2013,

title = {Patterns of herbivory and fluctuating asymmetry in Solanum lycocarpum St. Hill (Solanaceae) along an urban gradient in Brazil},

author = {Pablo Cuevas-Reyes and Livia Gilberti and Antonio González-Rodríguez and G. Wilson Fernandes},

url = {http://dx.doi.org/10.1016/j.ecolind.2012.08.011},

doi = {10.1016/j.ecolind.2012.08.011},

issn = {1470160X},

year  = {2013},

date = {2013-01-01},

journal = {Ecological Indicators},

volume = {24},

pages = {557-561},

publisher = {Elsevier Ltd},

abstract = {The urbanization of the natural landscape has spread along the major axis of all large towns worldwide, what has resulted in an unprecedented increase in habitat fragmentation and ultimately in a mosaic of patches of native vegetation. These changes have a continuum of impacts on the processes and mechanisms that shape habitat diversity and species interactions. An important and overlooked aspect that may aid in the understanding of the effects of urbanization on species interactions is herbivory. Herbivores and leaf removal can signalize the effects of the habitat via their host plants. Another potentially useful measure for evaluating the effects of environmental stress on particular species is fluctuating asymmetry. We studied the herbivory levels and leaf fluctuating asymmetry on Solanum lycocarpum (Solanaceae) along an urban gradient in Brazil. The leaf area removed by folivores differed among sites and was significantly greater in the site with the higher level of urbanization. Also, the area removed varied significantly among individuals within urbanization sites. Similarly, the frequency of leaves with folivore damage was greater in the site with higher urbanization, although the area removed by them did not differ between shorter and larger plants. FA was significantly greater in the more urbanized sites in comparison with the other sites in the urbanization gradient and varied among individuals within site. Finally, we found a positive relationship between leaf area removed and FA values in the urbanization gradient. These results indicate that increased urbanization causes a reduction in habitat suitability for S. lycocarpum, which is reflected on higher FA levels. The leaf herbivores may benefit from the stress levels of hosts on more urbanized sites, which may have been caused by several factors acting in combination such as lower defenses, higher susceptibility and natural enemy pressures via habitat fragmentation/urbanization. This study exemplifies the variety of effects that urbanization exerts on remnant native populations and that fluctuating asymmetry could be a useful measure of the effects of these challenges on plant populations, and might also be used to assist management and conservation practices of natural areas within cities. © 2012 Elsevier Ltd. All rights reserved.},

keywords = {Fluctuating asymmetry, Herbivory, Solanum lycocarpum, Urbanization gradient},

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}

}

@article{Madeira2013,

title = {Tri-trophic interactions among congeneric sympatric host plants of Chamaecrista, seed predators and parasitoids},

author = {João A. Madeira and G. Wilson Fernandes and Antonio González-Rodríguez and Pablo Cuevas-Reyes},

doi = {10.1007/s11829-013-9255-2},

issn = {18728855},

year  = {2013},

date = {2013-01-01},

journal = {Arthropod-Plant Interactions},

volume = {7},

issue = {4},

pages = {403-413},

abstract = {The defensive role against seed predation of a set of plant traits in 13 congeneric sympatric taxa (Chamaecrista: Leguminosae), and the influence of the third trophic level on seed predators' performance and host range were investigated. Taxa co-occur in rupestrian grasslands in Serra do Cipó, Brazil, and belong to three taxonomic sections. Fruit production, fruit pubescence, and seed size were analyzed. Measures of these traits in the 13 taxa were regressed separately against seed predation rates by endophagous and ectophagous insects. Time of seed production and fruit pubescence showed no influence on seed predation rates by either predator type. Seed size was positively correlated to bruchid seed predation, but negatively related to ectophagous seed predation. There was a negative correlation between glandular fruit trichome length and parasitism rates of bruchids, suggesting that seed predation pressure may have produced evolutionary responses from plants (fruit trichome reduction), which should facilitate parasitoid action. © 2013 Springer Science+Business Media Dordrecht.},

keywords = {Bruchidae, Insect herbivory, Parasitoid wasps, Seed predation, Serra do Cipó},

pubstate = {published},

tppubtype = {article}

}

@article{Petit2013,

title = {Fagaceae trees as models to integrate ecology, evolution and genomics},

author = {Rémy J. Petit and John Carlson and Alexandru L. Curtu and Marie Laure Loustau and Christophe Plomion and Antonio González-Rodríguez and Victoria Sork and Alexis Ducousso},

doi = {10.1111/nph.12089},

issn = {0028646X},

year  = {2013},

date = {2013-01-01},

journal = {New Phytologist},

volume = {197},

issue = {2},

pages = {369-371},

keywords = {Biotic interactions, Bud burst, Hybridization, Modelling, phenology, phylogeny, speciation, Whole genome sequencing},

pubstate = {published},

tppubtype = {article}

}

@article{Magallan2013,

title = {Diversidad genética de Lilaea scilloides (Juncaginaceae) en el centro de México},

author = {Fabiola Magallán and Mahinda Martínez and Luis Hernández-Sandoval and Antonio González-Rodríguez and Ken Oyama},

url = {http://dx.doi.org/10.7550/rmb.18898},

doi = {10.7550/rmb.18898},

issn = {18703453},

year  = {2013},

date = {2013-01-01},

journal = {Revista Mexicana de Biodiversidad},

volume = {84},

issue = {1},

pages = {240-248},

publisher = {Elsevier},

abstract = {Lilaea scilloides (Juncaginaceae) is an aquatic species inhabiting temporary wetlands. It is an annual herbaceous emergent plant distributed from Canada to Argentina. This species reproduces both sexually and asexually, and is wind-pollinated. Flowers are highly heteromorphic with 5 different types of flowers. We hypothesized that, because of its pollination syndrome, wide distribution and local abundance, the species would have high genetic diversity, low endogamy, low genetic differentiation, and high gene flow. The objectives of this study were to determine the genetic diversity and structure of L. scilloides and compare with species with similar ecological and life history traits. We analyzed 40 individuals from 12 populations using isozyme electrophoresis in starch gels. The results showed a low within population genetic diversity (A= 1.77},

keywords = {Aneomophily, Aquatic plants, Lilaea, Temporary wetlands},

pubstate = {published},

tppubtype = {article}

}

@article{Hernandez-calderon2013,

title = {Contrasting leaf phenology in two white oaks,},

author = {Erasto Hernández-calderón and Antonio González-rodríguez and Rodrigo Méndez-alonzo and Ernesto Vega-peña and Ken Oyama},

doi = {10.1139/cjfr-2012-0406},

issn = {0045-5067},

year  = {2013},

date = {2013-01-01},

journal = {Canadian Journal of Forest Research of Forest},

volume = {43},

issue = {8701},

pages = {208-213},

abstract = {In tropical latitudes, the analysis of leaf phenology in tree species of lineages with temperate origin can help better understanding the potential effects of climate change on these forests. Over three years (2008–2010), we recorded the timing of bud burst (BB), leaf unfolding (LU), and leaf spreading (LS) and their relation to temperature, precipitation, and soil water potential in two deciduous oak species (Quercus magnoliifolia Née and Quercus resinosa Liebm.) along an altitudinal gradient at the Tequila Volcano, central Mexico. Quercus magnoliifolia was monitored at three altitudes, 1450, 1667, and 1787 m, and Q. resinosa was monitored at 1787, 2055, and 2110 m. The onset of BB, LU, and LS occurred earlier at lower elevations with higher temperature in Q. magnoliifolia, but in Q. resinosa only the onset of BB occurred later at lower elevations with higher temperature. BB, LU, and LS were not correlated with rainfall and soil water potential in the two species. The total duration time of leaf development was not significantly correlated with rainfall in Q. magnoliifolia, but a significant negative correlation with rainfall was found in Q. resinosa. Results indicated that leaf phenology of the two examined oak species exhibited contrasting responses to temperature and precipitation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Diversidad genética de Lilaea scilloides (Juncaginaceae) en el centro de México},

author = {Fabiola Magallán and Mahinda Martínez and Luis Hernández-Sandoval and Antonio González-Rodríguez and Ken Oyama},

doi = {10.7550/rmb.18898},

issn = {18703453},

year  = {2013},

date = {2013-01-01},

journal = {Revista Mexicana de Biodiversidad},

volume = {84},

issue = {1},

pages = {240-248},

publisher = {Universidad Nacional Autonoma de Mexico},

abstract = {Lilaea scilloides (Juncaginaceae) is an aquatic species inhabiting temporary wetlands. It is an annual herbaceous emergent plant distributed from Canada to Argentina. This species reproduces both sexually and asexually, and is wind-pollinated. Flowers are highly heteromorphic with 5 different types of flowers. We hypothesized that, because of its pollination syndrome, wide distribution and local abundance, the species would have high genetic diversity, low endogamy, low genetic differentiation, and high gene flow. The objectives of this study were to determine the genetic diversity and structure of L. scilloides and compare with species with similar ecological and life history traits. We analyzed 40 individuals from 12 populations using isozyme electrophoresis in starch gels. The results showed a low within population genetic diversity (A= 1.77},

keywords = {Aneomophily, Aquatic plants, Lilaea, Temporary wetlands},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Contrasting leaf phenology in two white oaks, Quercus magnoliifolia and Quercus resinosa, along an altitudinal gradient in Mexico},

author = {Erasto Hernández-Calderón and Antonio González-Rodríguez and Rodrigo Méndez-Alonzo and Ernesto Vega-Peña and Ken Oyama},

doi = {10.1139/cjfr-2012-0406},

issn = {00455067},

year  = {2013},

date = {2013-01-01},

journal = {Canadian Journal of Forest Research},

volume = {43},

issue = {2},

pages = {208-213},

abstract = {In tropical latitudes, the analysis of leaf phenology in tree species of lineages with temperate origin can help better understanding the potential effects of climate change on these forests. Over three years (2008-2010), we recorded the timing of bud burst (BB), leaf unfolding (LU), and leaf spreading (LS) and their relation to temperature, precipitation, and soil water potential in two deciduous oak species (Quercus magnoliifolia Née and Quercus resinosa Liebm.) along an altitudinal gradient at the Tequila Volcano, central Mexico. Quercus magnoliifolia was monitored at three altitudes, 1450, 1667, and 1787 m, and Q. resinosa was monitored at 1787, 2055, and 2110 m. The onset of BB, LU, and LS occurred earlier at lower elevations with higher temperature in Q. magnoliifolia, but in Q. resinosa only the onset of BB occurred later at lower elevations with higher temperature. BB, LU, and LS were not correlated with rainfall and soil water potential in the two species. The total duration time of leaf development was not significantly correlated with rainfall in Q. magnoliifolia, but a significant negative correlation with rainfall was found in Q. resinosa. Results indicated that leaf phenology of the two examined oak species exhibited contrasting responses to temperature and precipitation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pacheco-Olvera2012,

title = {Genetic diversity and structure of pepper (Capsicum annuum L.) from northwestern Mexico analyzed by microsatellite markers},

author = {Antonio Pacheco-Olvera and Sergio Hernández-Verdugo and Víctor Rocha-Ramírez and Antonio González-Rodríguez and Ken Oyama},

doi = {10.2135/cropsci2011.06.0319},

issn = {0011183X},

year  = {2012},

date = {2012-01-01},

journal = {Crop Science},

volume = {52},

issue = {1},

pages = {231-241},

abstract = {The analysis of the variability and genetic structure of wild and landrace populations of pepper (Capsicum annuum L.) is important for the management and conservation of valuable genetic resources and to understand the consequences of domestication on the patterns of neutral genetic variation. For this purpose, 12 populations of wild peppers, 3 landrace populations and 7 hybrid populations from northwestern Mexico were studied using microsatellites. On average, 3.62 alleles per locus were detected in the wild relatives, 3.37 in the landraces, and 3.08 in the hybrids. According to the average values of expected heterozygosity (He), slightly greater genetic diversity was found among the wild relatives (He = 0.466) than in the hybrids (He = 0.440) or the landraces (He = 0.422). In terms of the average number of alleles per locus and the average expected heterozygosity, reductions of 8.18 and 10.25% were found in the genetic diversity of the landraces and hybrids, respectively, with respect to the wild populations. The genetic differentiation among the populations was the highest among hybrids (GST = 0.324), followed by landraces (0.309) and wild relatives (the lowest, at 0.208). Cluster analysis clearly demarcated the wild relatives and domesticated populations into different groups. The high levels of genetic diversity found among C. annuum in northwestern Mexico suggest that the wild and landrace populations are a valuable resource that should be conserved. © Crop Science Society of America.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Round and large: Morphological and genetic consequences of artificial selection on the gourd tree Crescentia cujete by the Maya of the Yucatan Peninsula, Mexico},

author = {Xitlali Aguirre-Dugua and Luis E. Eguiarte and Antonio González-Rodrgíuez and Alejandro Casas},

doi = {10.1093/aob/mcs068},

issn = {03057364},

year  = {2012},

date = {2012-01-01},

journal = {Annals of Botany},

volume = {109},

issue = {7},

pages = {1297-1306},

abstract = {Background and AimsArtificial selection, the main driving force of domestication, depends on human perception of intraspecific variation and operates through management practices that drive morphological and genetic divergences with respect to wild populations. This study analysed the recognition of varieties of Crescentia cujete by Maya people in relation to preferred plant characters and documents ongoing processes of artificial selection influencing differential chloroplast DNA haplotype distribution in sympatric wild and home-garden populations. MethodsFifty-three home gardens in seven villages (93 trees) and two putative wild populations (43 trees) were sampled. Through semi-structured interviews we documented the nomenclature of varieties, their distinctive characters, provenance, frequency and management. Phenotypic divergence of fruits was assessed with morphometric analyses. Genetic analyses were performed through five cpDNA microsatellites. Key ResultsThe Maya recognize two generic (wild/domesticated) and two specific domesticated (white/green) varieties of Crescentia cujete. In home gardens, most trees (68%) were from domesticated varieties while some wild individuals (32%) were tolerated. Cultivation involves mainly vegetative propagation (76%). Domesticated fruits were significantly rounder, larger and with thicker pericarp than wild fruits. Haplotype A was dominant in home gardens (76%) but absent in wild populations. Haplotypes B-F were found common in the wild but at low frequency (24%) in home gardens. ConclusionsThe gourd tree is managed through clonal and sexual propagules, fruit form and size being the main targets of artificial selection. Domesticated varieties belong to a lineage preserved by vegetative propagation but propagation by seeds and tolerance of spontaneous trees favour gene flow from wild populations. Five mutational steps between haplotypes A and D suggest that domesticated germplasm has been introduced to the region. The close relationship between Maya nomenclature and artificial selection has maintained the morphological and haplotypic identity (probably for centuries) of domesticated Crescentia despite gene flow from wild populations. © The Author 2012. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.},

keywords = {Artificial selection, Bignoniaceae, Crescentia cujete, domestication, Maya, Mesoamerica, Microsatellites, traditional plant management},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Cavender-Bares2011,

title = {Phylogeography and climatic niche evolution in live oaks (Quercus series Virentes) from the tropics to the temperate zone},

author = {Jeannine Cavender-Bares and Antonio Gonzalez-Rodriguez and Annette Pahlich and Kari Koehler and Nicholas Deacon},

doi = {10.1111/j.1365-2699.2010.02451.x},

issn = {13652699},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Biogeography},

volume = {38},

issue = {5},

pages = {962-981},

abstract = {Aim We investigated the phylogeography, geographical variation in leaf morphology, freezing tolerance and climatic niches of two widespread evergreen sister oak species (Quercus) in the series Virentes. Location South-eastern USA, Mexico and Central America. Methods Nuclear microsatellites and non-recombining nuclear and chloroplast DNA sequences were obtained from trees throughout the range of two sister lineages of live oaks, represented by Quercus virginiana in the temperate zone and Q. oleoides in the tropics. Divergence times were estimated for the two major geographical and genetic breaks. Differentiation in leaf morphology, analysed from field specimens, was compared with the molecular data. Freezing sensitivities of Q. virginiana and Q. oleoides populations were assessed in common garden experiments. Results The geographical break between Q. virginiana and Q. oleoides was associated with strong genetic differentiation of possible early Pleistocene origin and with differentiation in freezing sensitivity, climatic envelopes and leaf morphology. A second important geographical and genetic break within Q. oleoides between Costa Rica and the rest of Central America showed a mid-Pleistocene divergence time and no differentiation in leaf morphology. Population genetic differentiation was greater but genetic diversity was lower within the temperate Q. virginiana than within the tropical Q. oleoides, and genetic breaks largely corresponded to breaks in leaf morphology. Main conclusions Two major breaks, one between Mexico and the USA at the boundary of the two species, and a more recent one within Q. oleoides between Honduras and Costa Rica, implicate climatic changes as potential causes. The latter break may be associated with the formation of the Cordillera de Guanacaste, which was followed by seasonal changes in precipitation. In the former case, an 'out of the tropics' scenario is hypothesized, in which the acquisition of freezing tolerance in Q. virginiana permitted colonization of and expansion in the temperate zone, while differences in climatic tolerances between the species limited secondary contact. More pronounced Pleistocene changes in climate and sea level in the south-eastern USA relative to coastal Mexico and Central America may explain the greater population differentiation within temperate Q. virginiana and greater genetic diversity in tropical Q. oleoides. These patterns are predicted to hold for other taxa that span temperate and tropical zones of North and Central America. © 2011 Blackwell Publishing Ltd.},

keywords = {Central America, chloroplast DNA sequences, Climatic niches, Freezing tolerance, Leaf morphology, Nuclear DNA, Pleistocen glacial cycles, Sea-level rise, South-eastern North America, Species boundaries},

pubstate = {published},

tppubtype = {article}

}