Chloroplast DNA polymorphism reveals geographic structure and introgression in theQuercus crassifolia ×Quercus crassipeshybrid complex in Mexico

Tovar-Sánchez, Efraı́n; Mussali-Galante, Patricia; Esteban-Jiménez, Rocío; Piñero, Daniel; Arias, Dulce M.; Dorado, Óscar; Oyama, Ken

doi:10.1139/b07-128

Cited by 25 publications

(21 citation statements)

References 62 publications

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“…This is because many oak species can be considered foundation species due to their wide geographic distribution (Valencia 2004) and dominance in the canopy of forests (TovarSánchez et al 2013) and because they are habitat to different species. They also show a high frequency of natural hybridization (Curtu et al 2007;Peñaloza-Ramírez et al 2010;Valencia-Cuevas et al 2015), a condition that can promote an increase in genetic diversity (Tovar-Sánchez et al 2008;Valencia-Cuevas et al 2014) and the appearance of new features in host plants (Tovar-Sánchez and Oyama 2004) which can be exploited by arthropod communities. However, to date, there are few studies that have evaluated the structure of arthropod communities associated with the canopy of oaks from a genetic perspective.…”

Section: Reviewmentioning

confidence: 99%

Oak canopy arthropod communities: which factors shape its structure?

Valencia-Cuevas

Tovar-Sánchez

2015

Rev. Chil. de Hist. Nat.

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Canopy of forest ecosystems has been recognized as a habitat that supports a wide variety of plants, vertebrates, invertebrates, and microbes. Within the invertebrate group, arthropods are characterized by their great abundance, diversity, and functional importance. Particularly in temperate forests, species of the genus Quercus (oaks) are one of the most important tree canopy groups, for its diversity and dominance. Different studies have shown that the oak canopy contains a high diversity of arthropods suggesting their importance as habitat for this group of organisms. In this review, we investigated the factors that determine the establishment, organization, and maintenance of arthropod communities in the oak canopy. In general, it was found that there is a lack of literature that addresses the study of oak canopy arthropod communities. Also, the following patterns were found: (a) the research has covered a wide variety of topics; however, there are differences in the depth to which each topic has been analyzed, (b) there are ambiguous criteria to define the structure of the canopy, (c) groups with different habitat preferences belonging to different guilds and uneven development stages have been studied, avoiding generalizations about patterns found, (d) the standardization in sampling techniques and collection has been difficult, (e) bias exists towards the study of phytophagous insects belonging to the Coleoptera, Hymenoptera, and Lepidoptera orders, and (f) there are few studies in other groups of arthropods, for example, acorn borers, whose activity has an impact on the fitness and dispersion of the host plants. Finally, we propose that the detection and study of patterns in oak canopy communities can be of great value to propose management and conservation strategies in these forests.

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Section: Reviewmentioning

confidence: 99%

Oak canopy arthropod communities: which factors shape its structure?

Valencia-Cuevas

Tovar-Sánchez

2015

Rev. Chil. de Hist. Nat.

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“…Oaks (Fagaceae, Quercus) are an ideal system to study the effects of host-plant species genetic diversity on their associated canopy communities because of their high levels of genetic variation (e.g., Tovar-Sánchez et al 2008;Valencia-Cuevas et al 2014, 2015; many of their species show a wide geographical distribution and canopy dominance (Valencia 2004), and constitute the habitat of different species. Therefore, some of them can be considered as foundation species.…”

Section: Introductionmentioning

confidence: 99%

Effect of host-plant genetic diversity on oak canopy arthropod community structure in central Mexico

Tovar-Sánchez

Valencia-Cuevas

Mussali-Galante

et al. 2015

Rev. Chil. de Hist. Nat.

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Background: Recently it has been proposed that the genetic diversity of foundation species influences the structure and function of the community by creating locally stable conditions for other species and modulating ecosystem dynamics. Oak species are an ideal system to test this hypothesis because many of them have a wide geographical distribution, and they are dominant elements of the forest canopy. In this study we explored the response of canopy arthropod community structure (diversity and biomass) to the level of genetic diversity of Quercus crassipes and Q. rugosa, two important canopy species. Also, we examined the effect of oak species and locality on some community structure parameters (diversity, biomass, rare species, and richness of arthropod fauna) of canopy arthropods. In total, 160 canopies were fogged in four localities at the Mexican Valley (ten trees per species per locality per season). Results: Q. crassipes registered the highest number of rare species, diversity index, biomass, and richness in comparison with Q. rugosa. We found a positive and significant relationship between genetic diversity parameters and canopy arthropod diversity. However, canopy arthropod biomass registered an inverse pattern. Our results support the hypothesis that the genetic diversity of the host-plant species influences the assemblage of the canopy arthropod community. Conclusions: The pattern found in our study provides a powerful tool when trying to predict the effects of the genetic diversity of the host-plant species on different community structure parameters, which permits assignment of a new conservation status to foundation species based on their genetic diversity.

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“…2004). Chloroplast DNA analyses revealed that for both species, colonization routes were in a north -south direction following the formation and retreat of glaciers during the Last Glacial Maximum (Tovar-Sánchez et al 2008). Quercus crassifolia colonized initially the northern part of SMOc, the entire FVT and the southern parts of SMOr.…”

Section: Methodsmentioning

confidence: 99%

“…Hybrid zones have been found between several Quercus species pairs (Tovar-Sánchez & Oyama 2004) and some authors have explored hybridization rates between three or more species of Quercus (Peñaloza-Ramírez et al 2010, Valencia-Cuevas et al 2014. Also, phylogeographical analyses have revealed a complex history of hybridization and introgression between oak species (González-Rodríguez et al 2004, Tovar-Sánchez et al 2008. Despite the high number of studies, the genus Quercus is still considered a "difficult" group for taxonomists.…”

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confidence: 99%

Micromorphological character expression of the hybrid Quercus × dysophylla and its parental species (Q. crassifolia and Q. crassipes)

López-Caamal¹,

Ruiz-Amaro²,

Zepeda-Rodríguez³

et al. 2017

Bot. Sci.

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Background: Hybridization leads to individuals with atypical phenotypes, leading to taxonomic confusion when hybridizing populations are studied. Micromorphological characters may enable taxonomists to discriminate between parental and hybrid categories due to their simple genetic inheritance. Species study: Three oak taxa distributed in the montane regions of the Mexico were studied: Quercus crassifolia, Q. crassipes and their hybrid Q. × dysophylla. Hypothesis: We describe the leaf micromorphological and macromorphological variation of these taxa. Specifically, we searched for a unique combination of micromorphological characters in hybrids. We hypothesize that spatial micromorphological variation will match the spatial pattern revealed by a previous genetic study. Study sites: Two allopatric stands for each parental species and seven hybrid zones were studied. Individuals within each stand were identified as belonging to parental or hybrid categories following previous genetic analyses. Methods: Stomata and trichome types for each taxa were determined through Scanning Electron Microscopy. Eight micromorphological characters for trichomes and stomata and four foliar macromorphological characters were measured. Results: We found the presence of both multirradiate and simple stellate non-glandular trichomes as a diagnostic feature of Q. × dysophylla. Overall populations, Q. × dysophylla showed intermediate phenotypes in 70 % of morphological characters. However, hybrid phenotype exhibited geographical variation. Lastly, spatial hybrid's phenotype variation did not correlate with the spatial genetic pattern previously identified. Conclusions:The micromorphological features of Q. × dysophylla may enable taxonomists to accurately discriminate between this taxon and its parental species. Finally, we suggest that micromorphological expression of both parental species and hybrids may be influenced by environmental gradients and microclimates. Keywords: hybrid phenotype, morphometrics, stomata, trichome. ResumenAntecedentes: La hibridación resulta en individuos con morfologías atípica, lo cual lleva a confusiones taxonómica al estudiar poblaciones en las que ocurre hibridación. Los caracteres micromorfológicos pueden ser útiles para diferenciar entre individuos híbridos y parentales. Especies de estudio: Se estudiaron tres taxones de encinos: Quercus crassifolia, Q. crassipes y Q. × dysophylla, el híbrido de estas especies. Hipótesis: Se describe la expresión de caracteres micromorfológicos y macromorfológicos de estos taxones. En particular, se buscó una combinación única de caracteres micromorfológicos en los híbridos. Asimismo, esperamos que la variación espacial fenotípica sea similar a la encontrada en un estudio genético previo. Sitio de estudio: Se estudiaron dos poblaciones alopátridas para cada especie parental y siete zonas híbridas. Los individuos fueron considerados como parentales o híbridos de acuerdo al estudio genético previo. Métodos: Los tipos de estomas y tricomas para cada taxón fueron ident...

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Chloroplast DNA polymorphism reveals geographic structure and introgression in theQuercus crassifolia ×Quercus crassipeshybrid complex in Mexico

Cited by 25 publications

References 62 publications

Oak canopy arthropod communities: which factors shape its structure?

Oak canopy arthropod communities: which factors shape its structure?

Effect of host-plant genetic diversity on oak canopy arthropod community structure in central Mexico

Micromorphological character expression of the hybrid <em>Quercus</em> × <em>dysophylla</em> and its parental species (<em>Q. crassifolia</em> and <em> Q. crassipes</em>)

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