Publicaciones

@article{Cuevas-Reyes2011a,

title = {Effects of generalist and specialist parasitic plants (Loranthaceae) on the fluctuating asymmetry patterns of ruprestrian host plants},

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

doi = {10.1016/j.baae.2011.04.004},

issn = {16180089},

year  = {2011},

date = {2011-01-01},

journal = {Basic and Applied Ecology},

volume = {12},

issue = {5},

pages = {449-455},

abstract = {Leaf fluctuating asymmetry (FA) is an important indicator of plant responses to various sources of stress, which range from poor nutritional and harsh environmental conditions to herbivory and parasitism. Mistletoes are important hemiparasites, which represent a source of stress for their host plants but, in spite of being common in all major biogeographical regions of the world, no study has measured the response of their hosts in terms of leaf FA. We addressed the effect of mistletoes on host-plant foliar FA by comparing parasitized and non-parasitized individuals of four host species in two sites in southeastern Brazil, Serra do Cipó and Serra do Rola Moça. In the four host species, parasitized individuals presented significantly higher levels of leaf FA than unattacked plants. The specialist mistletoe Phoradendron cf. amplexicaule induced higher levels of FA on its host Erythroxylum suberosum (Erythroxylaceae) than the generalist mistletoe Struthanthus flexicaulis did on either Mimosa calodendron (Fabaceae), Lychnophora pinaster (Asteraceae) or Stachytarpheta glabra (Verbenaceae). We hypothesized that specialized parasites could be more damaging to their hosts than generalist mistletoes, which could explain the higher FA levels observed. Significant differences in FA levels among parasitized individuals within species were found, which were significantly correlated with intensity of infection (number of mistletoes per host individual). The results indicate that mistletoes represent an important factor of stress for their host plants, and that FA can be an excellent instrument for evaluating the effects of infections by parasitic plants. © 2011 Gesellschaft für Ökologie.},

keywords = {Fluctuating asymmetry, Host parasite-relationships, mistletoe, Parasitism impact, Rupestrian fields, Serra do Cipó, Serra do Rola Moça},

pubstate = {published},

tppubtype = {article}

}

@article{Cuevas-Reyes2011,

title = {Contrasting herbivory patterns and leaf fluctuating asymmetry in Heliocarpus pallidus between different habitat types within a Mexican tropical dry forest},

author = {Pablo Cuevas-Reyes and Ken Oyama and Antonio González-Rodríguez and G. Wilson Fernandes and Luis Mendoza-Cuenca},

doi = {10.1017/S026646741100006X},

issn = {14697831},

year  = {2011},

date = {2011-01-01},

journal = {Journal of Tropical Ecology},

volume = {27},

issue = {4},

pages = {383-391},

abstract = {Leaf fluctuating asymmetry (FA) is considered an important indicator of environmentally induced stress in plants, but the relationship between herbivory and FA levels is not clear. In this study we compared leaf size and shape, leaf area consumed by herbivorous insects, and FA levels between individuals of Heliocarpus pallidus (Tiliaceae) from two adjacent and contrasting habitat types (deciduous and riparian) in the Chamela-Cuixmala tropical dry-forest biosphere reserve. Ten individuals of H. pallidus were collected in each habitat type. Leaf shape was assessed using geometric morphometric techniques. Results indicated statistically significant differences in leaf shape between individuals from the two habitat types. In individuals from the riparian habitat leaf area (mean = 42.3 ± 1.2 cm2), herbivory levels (mean = 25.5% ± 1.8%) and FA levels (mean = 0.38 ± 0.04 cm) were significantly higher than in individuals from the deciduous habitat (17.2 ± 3.5 cm2; 9.6% ± 1.0% and 0.18 ± 0.04 cm, respectively). Within habitats, significant correlations were found between total leaf area and percentage leaf area removed by insects (R2 = 0.92 in riparian habitats},

keywords = {Fluctuating asymmetry, geometric morphometrics, Herbivory, leaf size, tropical dry forest},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Albarran-Lara2010,

title = {Leaf fluctuating asymmetry increases with hybridization and introgression between quercus magnoliifolia and quercus resinosa (fagaceae) through an altitudinal gradient in Mexico},

author = {Ana Luisa Albarrán-Lara and Luis Mendoza-Cuenca and Susana Valencia-Avalos and Antonio González-Rodríguez and Ken Oyama},

doi = {10.1086/650317},

issn = {10585893},

year  = {2010},

date = {2010-01-01},

journal = {International Journal of Plant Sciences},

volume = {171},

issue = {3},

pages = {310-322},

abstract = {We tested the effects of hybridization and introgression on the levels of leaf fluctuating asymmetry (FA) in a hybrid zone between Quercus magnoliifolia and Quercus resinosa at the Tequila volcano, Jalisco state, Mexico, in which the species are distributed along an altitudinal gradient ranging from 1400 to 2100 m. Bayesian clustering analysis was performed with STRUCTURE on data for eight nuclear microsatellite loci to assign individuals from reference populations and from the hybrid zone to pure or hybrid genotypic classes. To test the performance of the assignment procedure and to determine optimal thresholds for genetic assignment pure, hybrid and backcrossed genotypes were simulated (from the allelic frequencies found in real pure populations of the two species) and reanalyzed with STRUCTURE. Leaf FA and morphological identification of parental and hybrid individuals were obtained using geometric morphometric techniques. We found genetic and morphological evidence of a hybrid zone by secondary contact at the Tequila volcano. The genotypes and phenotypes were significantly correlated with altitude along the mountain, but no correlation between them was found. FA was higher in F1 hybrids and backcrossed genotypes than in pure species. Levels of FA were more correlated with the proportion of genetic ancestry of each individual than with leaf morphology or altitude, supporting the hypothesis that hybridization is associated with development instability potentially caused by disruption of coadapted gene complexes characteristic of each species. © 2010 by The University of Chicago. All rights reserved.},

keywords = {Genetic assignment, Hybridization, introgression, Leaf fluctuating asymmetry, Quercus.},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Parra2010,

title = {Evolution under domestication: Ongoing artificial selection and divergence of wild and managed Stenocereus pruinosus (Cactaceae) populations in the Tehuacán Valley, Mexico},

author = {Fabiola Parra and Alejandro Casas and Juan Manuel Peñaloza-Ramírez and Aurea C. Cortés-Palomec and Víctor Rocha-Ramírez and Antonio González-Rodríguez},

doi = {10.1093/aob/mcq143},

issn = {10958290},

year  = {2010},

date = {2010-01-01},

journal = {Annals of Botany},

volume = {106},

issue = {3},

pages = {483-496},

abstract = {Background and AimsThe Tehuacán Valley in Mexico is a principal area of plant domestication in Mesoamerica. There, artificial selection is currently practised on nearly 120 native plant species with coexisting wild, silvicultural and cultivated populations, providing an excellent setting for studying ongoing mechanisms of evolution under domestication. One of these species is the columnar cactus Stenocereus pruinosus, in which we studied how artificial selection is operating through traditional management and whether it has determined morphological and genetic divergence between wild and managed populations.MethodsSemi-structured interviews were conducted with 83 households of three villages to investigate motives and mechanisms of artificial selection. Management effects were studied by comparing variation patterns of 14 morphological characters and population genetics (four microsatellite loci) of 264 plants from nine wild, silvicultural and cultivated populations.Key ResultsVariation in fruit characters was recognized by most people, and was the principal target of artificial selection directed to favour larger and sweeter fruits with thinner or thicker peel, fewer spines and pulp colours others than red. Artificial selection operates in agroforestry systems favouring abundance (through not felling plants and planting branches) of the preferred phenotypes, and acts more intensely in household gardens. Significant morphological divergence between wild and managed populations was observed in fruit characters and plant vigour. On average, genetic diversity in silvicultural populations (HE = 0·743) was higher than in wild (HE = 0·726) and cultivated (HE = 0·700) populations. Most of the genetic variation (90·58 ) occurred within populations. High gene flow (NmFST > 2) was identified among almost all populations studied, but was slightly limited by mountains among wild populations, and by artificial selection among wild and managed populations.ConclusionsTraditional management of S. pruinosus involves artificial selection, which, despite the high levels of gene flow, has promoted morphological divergence and moderate genetic structure between wild and managed populations, while conserving genetic diversity. © The Author 2010.},

keywords = {Cactaceae, Columnar cacti, crop evolution, domestication, Mesoamerica, Stenocereus pruinosus, traditional plant management},

pubstate = {published},

tppubtype = {article}

}

@article{Uribe-Salas2008,

title = {Foliar morphological variation in the white oak Quercus rugosa Née (Fagaceae) along a latitudinal gradient in Mexico: Potential implications for management and conservation},

author = {Dolores Uribe-Salas and Cuauhtémoc Sáenz-Romero and Antonio González-Rodríguez and Oswaldo Téllez-Valdéz and Ken Oyama},

doi = {10.1016/j.foreco.2008.08.002},

issn = {03781127},

year  = {2008},

date = {2008-01-01},

journal = {Forest Ecology and Management},

volume = {256},

issue = {12},

pages = {2121-2126},

abstract = {Quercus rugosa Nee (section Quercus) has a distribution from the southern United States to Honduras. This study characterized leaf variation across the whole distribution of the species in Mexico. Ten foliar morphometric characters were scored in each of 241 individuals from 25 localities. A principal component analysis resolved four principal components (PCs) that explained 76.4% of the total variation. A nested analysis of variance revealed significant differences among populations (29.2% average contribution to total variance for the four PCs) and among-trees within populations (39.2%), while 31.6% was due to intra-individual variation. For the first PC (related to leaf size), 52.1% resulted from among population differences. This variation was negatively correlated with latitude (r = -0.86; P < 0.0001), indicating a steep clinal reduction in leaf size from south to north. Mean annual precipitation and an annual aridity index also significantly decreased and increased with latitude, respectively. It is suggested that the morphological cline is the result of plastic and/or adaptive responses to environmental conditions, and indicative of further ecophysiological latitudinal differences among Q. rugosa populations. Additionally, we estimated the magnitude of the least significant difference among populations for the first PC and translated it into a delineation of six latitudinal zones (each with a width of 2°30′), to be considered as preliminary zones for the movement of Q. rugosa seeds with management and conservation purposes, including management in response to global warming. © 2008 Elsevier B.V. All rights reserved.},

keywords = {Annual moisture index, Foliar morphological variation, leaf size, Phenotypic cline, Quercus rugosa, Seed zoning},

pubstate = {published},

tppubtype = {article}

}

@article{Scareli-Santos2007,

title = {Comparative analysis of micromorphological characters in two distantly related Mexican oaks, Quercus conzattii and Q. eduardii (Fagaceae), and their hybrids},

author = {Claudia Scareli-Santos and María Luisa Herrera-Arroyo and María L. Sánchez-Mondragón and Antonio González-Rodríguez and Jeffrey Bacon and Ken Oyama},

doi = {10.1663/0007-196X(2007)59[37:CAOMCI]2.0.CO;2},

issn = {0007196X},

year  = {2007},

date = {2007-01-01},

journal = {Brittonia},

volume = {59},

issue = {1},

pages = {37-48},

abstract = {Interspecific hybridization occurs with high frequency in the genus Quercus, but few studies have analyzed and compared micromorphological characters in putative parental species and their hybrids, Quercus eduardii and Q. conzattii are two Mexican black oak species that, although distantly related, have formed at least one population of hybrid origin, where individuals with intermediate macromorphology are present. The purpose of this investigation was to analyze the degree of differentiation in micromorphological characters between the two species and to assess the expression of these characters in individuals with intermediate macromorphology. Foliar trichomes, epicuticular waxes, stomata, and pollen grains, were examined using scanning electron microscopy (SEM) in the three types of individuals (Q. conzattii, Q. eduardii, and intermediates). Trichome density was quantified with light microscopy. Types of trichomes present, length of trichome arms, types of epicuticular wax on the leaf surfaces, and the position of stomata with respect to the foliar surface were characters useful to differentiate between Q. conzattii and Q. eduardii. Plants with intermediate macromorphology displayed a pattern of micromorphological characters that were identical to one parental species (Q. conzattii), or extreme or novel relative to both species. © 2007, by The New York Botanical Garden Press.},

keywords = {Epicuticular wax, Hybridization, Micromorphology, Pollen, Quercus, SEM, Trichomes},

pubstate = {published},

tppubtype = {article}

}

@article{Verdugo2006,

title = {de México analizada con isoenzimas y rapds Número completo Mais artigos Home da revista no Redalyc Sistema de Informação Científica ESTRUCTURA Y DIFERENCIACIÓN DE MÉXICO ANALIZADA CON GENETIC STRUCTURE AND DIFFERENTIATION OF WILD AND DOMESTICATED POPULATI},

author = {Hernández Verdugo and González Rodríguez and Sánchez Peña and Revista Fitotecnia Mexicana and Sociedad Mexicana De Fitogenética and Nota Científica and Sergio Hernández Verdugo and Antonio González and Pedro Sánchez Peña and Alejandro Casas},

year  = {2006},

date = {2006-01-01},

journal = {Revista Fitotecnia Mexicana ISSN:},

keywords = {capsicum annuum, conservación de recursos genéticos, dife-, genética de poblaciones, renciación genética},

pubstate = {published},

tppubtype = {article}

}

@article{Oyama2006,

title = {Genetic structure of wild and domesticated populations of Capsicum annuum (Solanaceae) from northwestern Mexico analyzed by RAPDs},

author = {Ken Oyama and Sergio Hernández-Verdugo and Carla Sánchez and Antonio González-Rodríguez and Pedro Sánchez-Peña and José Antonio Garzón-Tiznado and Alejandro Casas},

doi = {10.1007/s10722-004-2363-1},

issn = {09259864},

year  = {2006},

date = {2006-01-01},

journal = {Genetic Resources and Crop Evolution},

volume = {53},

issue = {3},

pages = {553-562},

abstract = {Levels of genetic variation and genetic structure of 15 wild populations and three domesticated populations of Capsicum annuum were studied by RAPD markers. A total of 166 bands (all of them polymorphic) and 126 bands (125 of them polymorphic) were amplified in wild and domesticated populations, respectively. Mean percentage of polymorphism was 34.2% in wild populations and 34.7% in domesticated populations. Mean and total genetic diversity were 0.069 and 0.165 for wild populations and 0.081 and 0.131 for domesticated populations. Parameters of genetic diversity estimated from 54 bands with frequencies ≥1 - (3/n) (n = sample size) showed that 56.7% of the total variation was within and 43.3% among wild populations, whereas 67.8% of the variation was within and 32.2% among domesticated populations. AMOVA indicated that total genetic diversity was equally distributed within (48.9 and 50.0%) and among (50.0 and 51.1%) populations in both wild and domesticated samples. Wild and domesticated populations were clearly resolved in a UPGMA dendrogram constructed from Jaccard's distances (average GD = 0.197), as well as by AMOVA (17.2% of variance among populations types},

keywords = {capsicum annuum, crop evolution, domestication, Genetic resources conservation, RAPDs, Solanaceae},

pubstate = {published},

tppubtype = {article}

}

@article{Gonzalez-Rodriguez2005a,

title = {Leaf morphometric variation in Quercus affinis and Q. laurina (Fagaceae), two hybridizing Mexican red oaks},

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

doi = {10.1111/j.1095-8339.2004.00394.x},

issn = {00244074},

year  = {2005},

date = {2005-01-01},

journal = {Botanical Journal of the Linnean Society},

volume = {147},

issue = {4},

pages = {427-435},

abstract = {Leaf variation was examined in two hybridizing Mexican red oaks, Quercus affinis and Q. laurina. Data of nine traits were obtained for ten randomly chosen leaves in each of 512 individuals from 16 populations sampled along a geographical gradient, including the distribution area of both species and a putative area of secondary contact and hybridization. A cluster analysis recognized two main groups of populations, which were congruent with the taxonomic assignment of the predominant morphological type within the populations and were thus labelled 'Q. affinis-like' and 'Q. laurina-like' population groups. A nested analysis of variance revealed that the largest proportion of the total variation was contained within populations, as among-tree variation (28-54%, depending on the trait), and as intra-individual variation (17-56%). However, differences between the two groups of populations (3-27%) and among populations within groups (5-21%) were also significant for the nine traits. A distinct pattern of change across populations was observed for each trait. Variation was particularly pronounced along the geographical gradient for petiole length and leaf-margin teeth number, possibly implying selection on these two traits. Results suggest that phenotypic plasticity, gene flow, hybridization and natural selection have shaped foliar variation in this oak complex. © 2005 The Linnean Society of London.},

keywords = {Foliar traits, Geographical variation, Hybrid zones, Phenotypic plasticity, Population differentiation},

pubstate = {published},

tppubtype = {article}

}

@article{Gonzalez-Rodriguez2005,

title = {Genetic variation and differentiation of populations within the Quercus affinis - Quercus laurina (Fagaceae) complex analyzed with RAPD markers},

author = {Antonio González-Rodríguez and Dulce M. Arias and Ken Oyama},

doi = {10.1139/B04-162},

issn = {00084026},

year  = {2005},

date = {2005-01-01},

journal = {Canadian Journal of Botany},

volume = {83},

issue = {2},

pages = {155-162},

abstract = {The population genetics of two hybridizing Mexican red oaks, Quercus affinis Schweid. and Quercus laurina Humb. & Bonpl., was investigated with 54 randomly amplified polymorphic DNA (RAPD) markers scored in 415 individuals from 16 populations representing the distribution area of the two species and a probable secondary hybrid zone. Genetic relationships among populations, depicted in a unweighted pair group method with arithmetic averaging (UPGMA) dendrogram, were largely incongruent with the morphological classification of populations as Q. affinis-like or Q. laurina-like that was obtained in previous studies. In contrast, the two main population clusters in the UPGMA dendrogram corresponded to the location of populations in two distinct geographical areas: southwestern and northeastern. A Mantel test confirmed a significant association between geographic and genetic distances among populations. Analyses of molecular variance (AMOVA) indicated that most genetic variation is contained within populations (84%), while 10.5% (P < 0.0001) is among populations, and 5.1% (P = 0.007) is between the two morphological groups. Differentiation between the southwestern and northeastern geographical groups (as recognized by the UPGMA), was 7.8% (P < 0.0001). The incongruence between genetic and phenotypic patterns suggests that introgression of neutral markers has been considerable between the two species in the hybrid zone, while morphological differentiation has remained comparatively stable. © 2005 NRC.},

keywords = {Hybridization, Population genetics, Quercus, RAPD markers},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Gonzalez-Rodriguez2004a,

title = {Morphological and RAPD analysis of hybridization between Quercus affinis and Q. laurina (Fagaceae), two Mexican red oaks},

author = {Antonio González-Rodríguez and Dulce M. Arias and Susana Valencia and Ken Oyama},

doi = {10.3732/ajb.91.3.401},

issn = {00029122},

year  = {2004},

date = {2004-01-01},

journal = {American Journal of Botany},

volume = {91},

issue = {3},

pages = {401-409},

abstract = {Quercus affinis and Q. laurina are two closely related Mexican red oaks with partially overlapping distributions. Within the area of overlap, there are localities where morphological intergradation occurs. A previous hypothesis explained this pattern as a result of secondary contact between the two species, followed by hybridization and introgression. This possibility was analyzed here by examining foliar and genetic variation in 16 localities situated along a macrogeographic gradient, which included morphologically representative populations of both species and populations from within the area of overlap. Maximum-likelihood hybrid index scores calculated from nine semi-diagnostic RAPD markers indicated a shift in the genetic composition of populations from one species to the other along the macrogeographic gradient, with genetically intermediate populations situated in the area of overlap. Foliar variation followed a partially congruent pattern, but Q. laurina-like morphology predominated in some of the genetically intermediate populations. There were several instances of correlated frequency changeovers of single RAPD markers and morphological characters along the macrogeographic gradient and a few cases of markedly parallel patterns between markers. The results were interpreted as consistent with a hypothesis of secondary contact between the two oak species that has resulted in some differential introgression among markers.},

keywords = {Hybrid zones, Hybridization, Quercus affinis, Quercus laurina, RAPD markers},

pubstate = {published},

tppubtype = {article}

}

@article{Gonzalez-Rodriguez2002,

title = {Inter- and intraspecific genetic variation and differentiation in the sibling bean weevils Zabrotes subfasciatus and Z. sylvestris (Coleoptera: Bruchidae) from Mexico},

author = {A. González-Rodríguez and B. Benrey and A. Callejas and K. Oyama},

doi = {10.1079/ber2001140},

issn = {0007-4853},

year  = {2002},

date = {2002-01-01},

journal = {Bulletin of Entomological Research},

volume = {92},

issue = {2},

pages = {185-189},

publisher = {UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{GonzLez-rodrGuez2000,

title = {Population Genetic Structure of Acanthoscelides obtectus and A. obvelatus (Coleoptera: Bruchidae) from Wild and Cultivated Phaseolus spp. (Leguminosae)},

author = {Antonio Gonz Lez-rodr Guez and Betty Benrey and Amé Rica Casta Eda and Ken Oyama},

url = {https://watermark.silverchair.com/aesa93-1100.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAAcowggHGBgkqhkiG9w0BBwagggG3MIIBswIBADCCAawGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQM7bK_-Wh3uy_rcNruAgEQgIIBfSAZ3rVg_lhEVSNQzXQPceTiL7CsY6xIwQukGPZkXDc},

year  = {2000},

date = {2000-01-01},

journal = {Entomol. Soc. Am},

volume = {04510},

issue = {935},

pages = {1100-1107},

abstract = {Allozyme electrophoresis was conducted on Acanthoscelides obtectus Say and A. obvelatus Bridwell collected from seeds of wild and cultivated populations of Phaseolus vulgaris L. and P. coccineus L. from Mexico to test for evidence of host-related and regional genetic differen-tiation. In total, Þve enzymes representing six different loci were resolved for the two beetle species. SigniÞcant genetic differentiation was found at the regional level for A. obtectus, but not among populations within regions or between hosts. In A. obvelatus, differentiation was not signiÞcant. Gene ßow values were high among insect populations within regions despite their association with different wild and cultivated species and subspecies of beans. Populations belonging to the same region cluster together in a unweighted pair-group method with arithmetic average dendrogram, based on NeiÕs unbiased genetic distances. A comparison of average expected heterozygosities revealed that A. obtectus had signiÞcantly higher levels of genetic variation than A. obvelatus, which may be explained by differences in life history traits and the geographic ranges of the two bruchids.},

keywords = {Acanthoscelides, allozymes, bruchids, gene ßow, Phaseolus, Population genetics},

pubstate = {published},

tppubtype = {article}

}