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

Tucker, John M.; Cottam, Walter P.; Drobnick, Rudy

doi:10.1002/j.1537-2197.1961.tb11647.x

Cited by 9 publications

(1 citation statement)

References 8 publications

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“…Among such species the ability to form hybrids is common and may even be selectively advantageous. Relatively recent climatic changes have been cited as important factors altering the distribution of modem oaks resulting in new opportunities for hybridization (Maze, 1968;Tucker, 1961;Tucker, Cottam and Drobnick, 1961;Tucker and Muller, 1956). It seems reasonable to suggest that hybridization precipitated by changes in distribution associated with late Eocene climatic change and subsequent selection for hybrids adapted to new environmental conditions might have been important in the modernization and diversification of the Quercoideae.…”

Section: Systematics-familymentioning

confidence: 99%

Oak Catkins, Leaves and Fruits from the Oligocene Catahoula Formation and Their Evolutionary Significance

Daghlian

Crepet

1983

American Journal of Botany

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Remains of staminate inflorescences, leaves, and fruits of Quercus from the Oligocene Catahoula Formation show striking similarity to modern subgenera Erythrobalanus (catkins and leaves) and Lepidobalanus (fruits). The appearance of modern subgenera in the Oligocene, only a short period of time after the first occurrences of Quercus in the fossil, record suggest a period of rapid evolution resulting in the modernization of Quercus. It is suggested that this period of relatively rapid evolution was in response to global climatic changes initiated at the Eocene-Oligocene boundary that may have been exaggerated by an Oligocene global lowstand of sea level. The climatic deterioration induced by these events may have allowed Paleogene Quercus to enter new adaptive zones through migration and hybridization culminating in the final major modernization of the oaks.

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Section: Systematics-familymentioning

confidence: 99%

Oak Catkins, Leaves and Fruits from the Oligocene Catahoula Formation and Their Evolutionary Significance

Daghlian

Crepet

1983

American Journal of Botany

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Studies in the Quercus Undulata Complex. Iii. The Contribution of Q. Arizonica

Tucker

1963

American J of Botany

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Tucker, J. M. (U. California, Davis.) Studies in the Quercus undulata complex. III. The contribution of Q. arizonica. Amer. Jour. Bot. 50(7): 699–708. Illus. 1903.—Of the 7 oak species involved in the Quercus undulata complex, Q. arizonica contributes the least of all. The latter has hybridized with Q. gambelii at a few widely separated localities (listed in Table 1) in central Arizona, and northern Sonora and Chihuahua, Mexico. The putative hybrids (identifiable as Quercus undulata) occur as isolated individuals with the parental species. The parents, although regionally sympatric, are usually ecologically isolated. They differ in a number of morphological characters, 6 of which were analyzed in detail. The resulting data, presented as pietorialized scatter diagrams, demonstrate that the putative hybrids are intermediate, in general. This is taken as evidence of their hybrid nature. Factors limiting hybridization in oaks are discussed. It is speculated that hybridization between Q. arizonica and Q. gambelii has occurred since the postglacial hypsithermal interval.

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Studies in the Quercus Undulata Complex. Iv. The Contribution of Quercus Havardii

Tucker

1970

American J of Botany

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Scrub oak populations in the semidesert area of northeastern Arizona and southeastern Utah are ordinarily identified in regional manuals as Quercus undulata. They are very similar, both morphologically and ecologically, to Q. havardii of the Staked Plain of the Texas Panhandle and southeastern New Mexico. They differ, however, in a number of inconspicuous characters. Population sample analyses indicate that most of these differences are suggestive of Q. gambelii, and the deviant populations are thus interpreted as having been derived from ancestral Q. havardii through introgression by Q. gambelii. Two differences are not in accord with this interpretation; these are regarded as possible cases of transgressive segregation. Considering the evolution of these hybridized populations, it is speculated that the ancestral Q. havardii occurred to the south and west of the present range of this species during the Kansan period of the Pleistocene. During subsequent northward dispersal, it became split in two. The eastern portion ultimately came to occupy the present range of the species in the Staked Plain; the western portion—lying to the west of a north‐south mountain barrier in central New Mexico—became introgressed by Q. gambelii (and locally by Q. turbinella), resulting in the present populations of Arizona and Utah.

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

Cited by 9 publications

References 8 publications

Oak Catkins, Leaves and Fruits from the Oligocene Catahoula Formation and Their Evolutionary Significance

Oak Catkins, Leaves and Fruits from the Oligocene Catahoula Formation and Their Evolutionary Significance

Studies in the Quercus Undulata Complex. Iii. The Contribution of Q. Arizonica

Studies in the Quercus Undulata Complex. Iv. The Contribution of Quercus Havardii

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