Studies in the Quercus Undulata Complex I. A Preliminary Statement

Tucker, John M.

doi:10.1002/j.1537-2197.1961.tb11626.x

Cited by 30 publications

(17 citation statements)

References 3 publications

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“…Hybrid progeny within these complexes are often colloquially referred to as "Q. undulata" (Tucker 1961). In the San Mateo Mountains of central New Mexico, a two-species hybrid complex exists between Q. gambelii and Q. grisea (Preszler and Boecklen 1994).…”

Section: Study Systemmentioning

confidence: 99%

No simple sum: seasonal variation in tannin phenotypes and leaf-miners in hybrid oaks

2007

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Parent-hybrid asymmetries in the biosynthesis of defense chemistry are believed to affect the distribution of herbivorous insects within plant hybrid zones. While tannins are often produced as complex, dynamic mixtures, the ecological effects of biological and ontogenetic variation in tannin metabolism within hybrid zones are poorly understood. Here, we examine correlations between the seasonal variation of absolute and relative concentrations of individual ellagitannins and total proanthocyanidins in the Quercus gambelii Q. grisea hybrid complex and a community of leaf-mining Lepidoptera (Gracillariidae, Heliozelidae, Nepticulidae, Tischeriidae), and examine the interactive effects between tannins on leaf-miner abundance. We found strong seasonal variation in oak tannin phenotypes, but two general phenotypes are characteristic of oaks of the Q. gambelii Q. grisea complex, based upon biosynthetic variation in high molecular weight ellagitannins. Leaf-miner community structure was significantly correlated with the dominant tannin phenotypes in the Q. gambelii Q. grisea hybrid zone in mid-summer (July, August). Additionally, leaf-miner density was significantly negatively correlated with the ratio of vescalagin-derivatives and total proanthocyanidins in August and September. Overall, hybridization affects biological and ontogenetic variation in ellagitannin and proanthocyanidin biosynthesis within the Q. gambelii Q. grisea hybrid complex and this variation correlates with herbivore distribution and abundance. Future studies of phenolic chemistry in plant-herbivore interactions in hybrid zones should include a more rigorous quantification of tannin phenotypes as complex, temporally dynamic mixtures.

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Section: Study Systemmentioning

confidence: 99%

No simple sum: seasonal variation in tannin phenotypes and leaf-miners in hybrid oaks

2007

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“…It is widely understood that hybridization and hybrid zones are common among oaks (Trelease 1924;Palmer 1948;Muller 1952;Tucker 1961;Cottam et al 1982;Spellenberg 1995); and oaks have played a central role in the debate over the importance of introgression in plant evolution (Anderson 1949;Whittemore and Schaal 1991;Rieseberg and Wendel 1993), stimulated thinking on the role of ecological factors in limiting hybridization (Stebbins et al 1947;Muller 1952;Rushton 1993), and served as model organisms in the development of species concepts that rely on ecological criteria (Van Valen 1976). Despite the perception that hybrid zones are a well-documented phenomenon among oaks, few genetic analyses of oak hybrid zones exist.…”

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confidence: 99%

“…The two taxa are sympatric at various sites, particularly in New Mexico. Where they occur together, they exhibit varying levels of hybridization, according to morphological classification of trees (Tucker 1961;R. Spellenberg, pers.…”

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confidence: 99%

How Discrete are Oak Species? Insights from a Hybrid Zone Between Quercus grisea and Quercus gambelii

Howard¹,

Preszler²,

Williams³

et al. 1997

Evolution

102

120

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The white oaks Quercus gambelii and Q. grisea overlap in distribution in New Mexico and Arizona. Within the region of overlap, there are numerous instances of contact between the two taxa. In some areas of contact morphologically, intermediate trees are common, whereas in others, morphologically intermediate trees are rare or absent. We describe a set of RAPD markers that distinguish between the two species and use these markers to examine patterns of gene exchange in an area of contact in the San Mateo Mountains of New Mexico. The markers are highly coincident with morphology and confirm that hybridization between the two species takes place. Despite the occurrence of hybrids, both species remain distinct, even in areas of sympatry, and marker exchange appears to be limited.

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“…IN A RECENT paper (Tucker, 1961) Quercus undulata was discussed as a highly variable complex of the Southwest, putatively of hybrid origin between Q. gambelii and a number of other species. Quercus turbinella was indicated as being one con-I Received for publication October 22, 1960. This study was aided by a National Science Foundation Grant to the senior author (G-9088) and travel assistance to the junior authors from the research fund of the University of Utah.…”

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confidence: 99%

“…1) . than is any other species involved in the Q. undulate (Specimens and their locations are listed in the complex (Tucker, 1961, fig. 1).…”

mentioning

confidence: 99%

Studies in the Quercus Undulata Complex. Ii. The Contribution of Quercus Turbinella

Tucker

Cottam

Drobnick

1961

American J of Botany

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Tucker, J. M. (U. California, Davis), W. P. Cottam, and R. Drobnick. Studies in the Quercus undulata complex. II. The contribution of Quercus turbinella. Amer. Jour. Bot. 48(4): 329–339. Illus. 1961.—Quercus undulata has been interpreted as a hybrid complex involving Q. gambelii and several other species, including Q. turbinella (Tucker, 1961). In the present paper, the total distribution of the hybrids between Q. gambelii and Q. turbinella is given. Lacking direct genetic evidence, proof of hybridity is sought in a demonstration of the morphological intermediacy of these putative hybrids. Population samples of both parental species, other samples containing hybrids, and numerous individual hybrids, are analyzed on the basis of 6 differences between the parental species. The data obtained, presented in the form of pictorialized scatter diagrams, clearly show the general intermediacy of the hybrids. Of the various binomials that have been applied to forms in the Q. undulata complex, Quercus pauciloba Rydb. applies to this hybrid. The appropriate change in status (Quercus × pauciloba Rydb.) is made.

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Studies in the Quercus Undulata Complex I. A Preliminary Statement

Cited by 30 publications

References 3 publications

No simple sum: seasonal variation in tannin phenotypes and leaf-miners in hybrid oaks

No simple sum: seasonal variation in tannin phenotypes and leaf-miners in hybrid oaks

How Discrete are Oak Species? Insights from a Hybrid Zone Between Quercus grisea and Quercus gambelii

Studies in the Quercus Undulata Complex. Ii. The Contribution of Quercus Turbinella

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