A Taxonomic Study Of Western Canadian Species In The Genus Betula
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A Taxonomic Study Of Western Canadian Species In The Genus Betula
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Author : Janet R. Dugle
language : en
Publisher:
Release Date : 1966
A Taxonomic Study Of Western Canadian Species In The Genus Betula written by Janet R. Dugle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
A Taxonomic Study Of Western Canadian Species In The Genus Betula
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Author : Janet Rogge Dugle
language : en
Publisher:
Release Date : 1964
A Taxonomic Study Of Western Canadian Species In The Genus Betula written by Janet Rogge Dugle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Birch categories.
Five western North American birches, Betula fontinalis . B. glandulosa , B. pumila var. glandulifera , B. resinifera and B. papyrifera are studied taxonomically. Synonymy, descriptions, distribution and representative specimens examined are included. Four hybrid taxa, B. x winteri , B. x sargentii , B. x arbuscula, and B. x uliginosa , are described for the first time and three additional hybrids, B>. x utahensis , B. x eastwoodae and B. x sandbergii are also included. When birch species are in contact, they often hybridize. The populations so formed have been analyzed and the nature of several hybrid entities determined. The methods of analysis applied are as follows: chromatography of leaves and bark; hybrid index; polygonal graphs; chromosome numbers; pollen size, morphology and stainability; stomatal size; germination data; and pictorialized scatter diagrams. Betula x uliginosa (2n = 28-56) is the result of hybridization between B. resinifera and B. pumila var. glandulifera . In the population analyzed, introgression was in the direction of B. pumila var. glandulifera , the birch with the higher chromosome number. When B. pumila var. glandulifera is in contact with B. glandulosa , B. x sargentii (2n = 28-56) is produced. Introgression seems to be in both directions, although most of the gene flow is in the direction of the taxon with the higher chromosome number, B. pumila var. glandulifera . B. x eastwoodae (2n = 28) is the result of hybridization between B. glandulosa and B. fontinalis . Introgression was influenced very little by environmental selection, and B. x eastwoodae seemed to be as common as either of the parental species; and any gene flow was in either direction. B. x utahensis (2n = 28-84 with a concentration at 2n = 56) is the result of hybridization between B. papyrifera and B. fontinalis . In populations of these birches, introgression is mainly from B. fontinalis into B. papyrifera . Hybridization of B. x sargentii and B. papyrifera results in B. x arbuscula (2n = 28-84), a rare hybrid. Tentative conclusions are that introgression is in the direction of B. papyrifera , the taxon with the higher chromosome number. Hybridization of B, resinifera and B. papyrifera produces B. x winteri (2n = 28-84 with a concentration of individuals at 2n = 56). In the populations of these birches which were analyzed, introgression was in both directions. B. x sandbergii (2n = 56-84) results from hybridization of B. papyrifera and B. pumila var. glandulifera . As contrasted with the above, and probably as a result of strong environmental influence in the area in which this cross was analyzed, introgression was in the direction of J3. pumila var. glandulifera , the parental taxon with the lower chromosome number.
General Technical Report Int
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Author :
language : en
Publisher:
Release Date : 1992
General Technical Report Int written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Forests and forestry categories.
The Genus Betula
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Author : Kenneth Ashburner
language : en
Publisher: Botanical Magazine Monograph
Release Date : 2013
The Genus Betula written by Kenneth Ashburner and has been published by Botanical Magazine Monograph this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Science categories.
Birches or Betula are among the most attractive and common trees in the landscape and in gardens. The Genus Betula is the first monograph published on this plant group, the species of which have been notoriously difficult to identify. Accounts are given of all known birches found in Europe, Asia and North America, both white and brown barked, and a key for their identification. An invaluable tool for arboriculturalists and professional and amateur gardeners, and will also appeal to lovers of botanical art.
Agriculture Handbook
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Author :
language : en
Publisher:
Release Date : 1979
Agriculture Handbook written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Agriculture categories.
General Technical Report Nc
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Author :
language : en
Publisher:
Release Date : 1981
General Technical Report Nc written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Forests and forestry categories.
A Population Study Of The Birches Betula Alleghaniensis B Pumila And Their Hybrid
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Author : Bruce Paul Dancik
language : en
Publisher:
Release Date : 1967
A Population Study Of The Birches Betula Alleghaniensis B Pumila And Their Hybrid written by Bruce Paul Dancik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Hybridization categories.
Evolutionary Biology
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Author : Theodosius Dobzhansky
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Evolutionary Biology written by Theodosius Dobzhansky and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
1 On Some Fundamental Concepts of Darwinian Biology.- Vitalism, Mechanism, and Compositionism.- Adaptedness and Adaptation.- Adaptedness to Survive and to Reproduce.- Adaptability.- Evolutionary Plasticity.- The Problem of Quantification of Adaptedness.- Darwinian Fitness.- Varieties of Natural Selection.- Darwinian Fitness and Adaptedness.- Evolutionary Opportunism and Adaptive Radiation.- Progressive Evolution.- References.- 2 Cave Ecology and the Evolution of Troglobites.- Animal Life in Caves.- The Cave Ecosystem.- Regressive Evolution in Cave Animals.- Speciation and Adaptation in Troglob.
Doctoral Research On Canada And Canadians 1884 1983
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Author : Jesse John Dossick
language : en
Publisher: National Library of Canada = Bibliothèque nationale du Canada
Release Date : 1986
Doctoral Research On Canada And Canadians 1884 1983 written by Jesse John Dossick and has been published by National Library of Canada = Bibliothèque nationale du Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Education categories.
Proceedings Northeastern Forest Tree Improvement Conference
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Author :
language : en
Publisher:
Release Date : 1982
Proceedings Northeastern Forest Tree Improvement Conference written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Forest genetics categories.