2005
González-Rodríguez, Antonio; Oyama, Ken
Leaf morphometric variation in Quercus affinis and Q. laurina (Fagaceae), two hybridizing Mexican red oaks Artículo de revista
En: Botanical Journal of the Linnean Society, vol. 147, iss. 4, pp. 427-435, 2005, ISSN: 00244074.
Resumen | Enlaces | Etiquetas: Foliar traits, Geographical variation, Hybrid zones, Phenotypic plasticity, Population differentiation
@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}
}
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.
2004
González-Rodríguez, Antonio; Arias, Dulce M.; Valencia, Susana; Oyama, Ken
Morphological and RAPD analysis of hybridization between Quercus affinis and Q. laurina (Fagaceae), two Mexican red oaks Artículo de revista
En: American Journal of Botany, vol. 91, iss. 3, pp. 401-409, 2004, ISSN: 00029122.
Resumen | Enlaces | Etiquetas: Hybrid zones, Hybridization, Quercus affinis, Quercus laurina, RAPD markers
@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}
}
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.