Download or read book A Revision of the Genus Polylepis Rosaceae Sanguisorbeae written by Beryl Brintnall Simpson and published by . This book was released on 1979 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Species of Polylepis are shrubs or trees native to the mid- and high-elevation tropical Andes. Some species of Polylepis form woodlands growing well above normal treeline within grass and scrub associations at elevations over 5000 m. Consequently, Polylepis appears to be the highest natural occurring arborescent angiosperm genus in the world. The physiological basis allowing such high altitude growth is not understood, but evidence indicates that woodlands at these elevations are restricted to microsites where ecological conditions are similar to those of lower altitudes. The genus is distinct from other rosaceous members of the tribe Sanguisorbeae and is interpreted here as consisting of three species groups that appear to have spread independently north and south along the Andean chain. Because of the patchy distributions of populations and disturbances by man, species are often polytopic. As a result, numerous forms have been described as distinct taxa in the past. In addition, hybridization appears to occur between species making circumscription of some taxa difficult. In this revision, evidence from studies of gross morphology, leaflet anatomy, pollen morphology, and field observations of the autecology of various populations were used to ascertain the number of species within the genus and their relationships to one another. Data from these sources indicate that Polylepis should be considered as consisting of 15 species, one of which is first described in this treatment. A key for the identification of the species is provided. Each species is illustrated, discussed, and its modern distribution mapped.
Download or read book A Revision of the Genus Polylepis Rosaceae Sanguisorbeae written by Beryl B. Simpson and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Species of Polylepis are shrubs or trees native to the mid- and high-elevation tropical Andes. Some species of Polylepis form woodlands growing well above normal treeline within grass and scrub associations at elevations over 5000 m. Consequently, Polylepis appears to be the highest natural occurring arborescent angiosperm genus in the world. The physiological basis allowing such high altitude growth is not understood, but evidence indicates that woodlands at these elevations are restricted to microsites where ecological conditions are similar to those of lower altitudes. The genus is distinct from other rosaceous members of the tribe Sanguisorbeae and is interpreted here as consisting of three species groups that appear to have spread independently north and south along the Andean chain. Because of the pacthy distributions of populations and disturbences by man, species are often polytopic. Asa a result, numerous forms have been described as distinct taxa in the past. In addition, hybridization appears to occur between species making circumscription of some taxa difficult. In this revision, evidence from studies of gross morphology, leaflet anatomy, pollen morphology, and field observations of the autecology of various populations were used to ascertain the number of species within te genus and their relationships to one another. Data from these sources indicate that Polylepis should be considered as consisting of 15 species, one of which is first described in this treatment. A key for the identification of the species is provided. Each species is illustrated, discussed, and its modern distribution mapped.
Download or read book A Revisi n of the Genus Polylepis rosaceae written by Beryl Brintnall Simpson and published by . This book was released on 1979 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Insights Into the Evolutionary History of the Complex Andean Genus Polylepis Rosaceae Sanguisorbeae and Implications for Conservation and Management written by Maria Claudia Segovia Salcedo and published by . This book was released on 2014 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ploidies were detected: 6x (2n~42), 10x (2n~72), and 12x (2n~82). Chromosome counts, chromosome evolution models and flow cytometry results support the hypothesis that polyploidy and hybridization have played prominent roles in the evolution of this Andean tree. Finally, eight polymorphic dinucleotide microsatellite loci isolated from Polylepis racemosa are described, and I document their utility in the analysis of population differentiation and genetic diversity thoughout Polylepis.
Download or read book A Monograph of the Genus Polylepis Rosaceae written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Revision of the Lichen Family Thelotremataceae in Panama written by Mason E. Hale and published by . This book was released on 1978 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The genus Boerhavia is discussed, its infrageneric classification is reviewed, and four sub-genera are recognized. Distinctions of two Linnaean species, B. diffusa and B. repens are clarified. Boerhavia mutabilis R. Brown and B. pubescens R. Brown are typified. The Boerhavia repens group is discussed and delimited, as is B. rubicunda and several similar species. Boerhavia repens var. maris-indici, B. albiflora, B. crispifolia, and B. herbstii are described as new. A curious abnormal form of B. crispifolia is also described and discussed.
Download or read book Mountain Timberlines written by Friedrich-Karl Holtmeier and published by Springer Science & Business Media. This book was released on 2009-03-15 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 40 years I have been engaged in timberline research. Thus, one could suppose that writing this book should not have been too difficult. It was harder, however, than expected, and in the end I felt that more questions had arisen than could be answered within its pages. Perhaps it would have been easier to write the book 30 years ago and then leave the subject to mature. Lastly it was the late Prof. Heinz Ellenberg who had convinced me to portray a much needed and complete picture of what we know of the timberline with special respect to its great physiognomic, structural and ecological variety. The first version of this book was p- lished in the German language (Holtmeier, 2000). Nevertheless, I was very delighted when Prof. Martin Beniston encouraged me to prepare an English edition for the series ‘Advances in Global Change Research’, which guaranteed a wider circulation. Timberline is a worldwide and very heterogeneous phenomenon, which can only be presented by way of examples. My own field experience is necessarily limited to certain timberline areas, such as the Alps, northern Scandinavia, northern Finland and many high mountain ranges in the western United States and Canada. However, my own observations and the results of my and my previous collaborators research were essential for developing the concept of the book and became integrated into the picture of timberline that is presented in the following chapters.
Download or read book A Study of the Genus Schistocarpha Heliantheae Asteraceae written by Harold Robinson and published by . This book was released on 1979 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nature and Culture in the Andes written by Daniel W. Gade and published by Univ of Wisconsin Press. This book was released on 1999 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text reveals the intimate and unexpected relationships of plants, animals and people in western South America. Daniel Gade encourages the reader to look beyond the obvious to see the true complexity of ecological relationships.
Download or read book 1997 IUCN Red List of Threatened Plants written by World Conservation Monitoring Centre and published by IUCN. This book was released on 1998 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the most comprehensive compilation of data on threatened vascular plants ever published. It includes the names of some 33,000 plant species determined to be rare or threatened on a global scale. Conservation assessments were provided by the IUCN Species Survival Commission, the National Botanical Institute (South Africa), Environment Australia, and CSIRO, The Nature Conservancy, the Smithsonian Institution, and the Royal Botanic Gardens, Kew, together with hundreds of botanic gardens and botanists throughout the world. The Royal Botanic Gardens Edinburgh and the New York Botanical Garden have made major in-kind contributions.The result of 20 years work by botanists and conservationists around the world, it is intended as a conservation tool, a provider of baseline information to measure conservation progress and as a primary source of data on plant species. Most importantly, however, it provides the building blocks on which to base a worldwide effort to conserve plant species.
Download or read book Pollen Morphology and Phylogenetic Relationships of the Berberidaceae written by Joan W. Nowicke and published by . This book was released on 1981 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monitoring Biodiversity written by Alfonso Alonso and published by Smithsonian Institution. This book was released on 2014-01-01 with total page 769 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book compiles case studies regarding the biodiversity research and monitoring program of Andean species and habitats carefully chosen as indicators to assess the short- and long-term effects of a linear disturbance: the PERU LNG pipeline. Set in a scientifically unexplored region of the Andes, Monitoring Biodiversity clearly articulates the Smithsonian-led conceptual framework for the implementation in the field by scientists. It addresses scientific and conservation questions addressed by the research protocols, the experimental design, and data gathering. Moreover, the book covers a gap on how to integrate biodiversity research, monitoring, and conservation into sustainable development projects of national and international interest. The text is presented in both English and Spanish.
Download or read book Flowering Plants Dicotyledons written by Klaus Kubitzki and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiled and written for advanced students, this encyclopedia contains a comprehensive treatment of the taxonomy of the families and genera of ferns and seed plants. The present volume, the sixth in this series, deals with five groups of dicotyledons, the Celastrales, Oxalidales, Rosales, Cornales, and Ericales, comprising 48 families.
Download or read book Land Use Change and Mountain Biodiversity written by Eva M. Spehn and published by CRC Press. This book was released on 2006-01-13 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of the worldwide biodiversity program DIVERSITAS, the Global Mountain Biodiversity Assessment (GMBA) assesses the biological richness of high-elevation biota. GMBA's focus includes the uppermost forest regions or their substitute rangeland vegetation, the treeline ecotone, and the alpine and nival belts. Providing more than description, the GM
Download or read book A Scanning Electron Microscope Survey of the Epidermis of East African Grasses written by Alan P. Smith and published by . This book was released on 1980 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Consequences of Climate Change for Plant Biodiversity in High Mountain Ecosystems written by Angela Sierra-Almeida and published by Frontiers Media SA. This book was released on 2022-02-23 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physical Geography of South America written by Thomas T. Veblen and published by Oxford University Press. This book was released on 2015-12-01 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physical Geography of South America, the eighth volume in the Oxford Regional Environments series, presents an enduring statement on the physical and biogeographic conditions of this remarkable continent and their relationships to human activity. It fills a void in recent environmental literature by assembling a team of specialists from within and beyond South America in order to provide an integrated, cross-disciplinary body of knowledge about this mostly tropical continent, together with its high mountains and temperate southern cone. The authors systematically cover the main components of the South American environment - tectonism, climate, glaciation, natural landscape changes, rivers, vegetation, animals, and soils. The book then presents more specific treatments of regions with special attributes from the tropical forests of the Amazon basin to the Atacama Desert and Patagonian steppe, and from the Atlantic, Caribbean, and Pacific coasts to the high Andes. Additionally, the continents environments are given a human face by evaluating the roles played by people over time, from pre-European and European colonial impacts to the effects of modern agriculture and urbanization, and from interactions with El Niño events to prognoses for the future environments of the continent.
