Prospection Des Hydrocarbures Dans La Mer De Beaufort Perspective Du Gouvernement F D Ral
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The Ecology Of River Systems
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Author : Bryan R. Davies
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
The Ecology Of River Systems written by Bryan R. Davies 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 2013-03-09 with Science categories.
Our understanding of the ecology of running waters has come a long way during the past few years. From being a largely descriptive subject, with a few under tones concerned with such things as fisheries, pollution or control of blackflies, it has evolved into a discipline with hypotheses, such as the River Continuum Concept (Vannote et a/. 1980), and even a book suggesting that it offers opportunity for the testing of ecological theory (Barnes & Minshall 1983). However, perusal of the literature reveals that, although some of the very early studies were concerned with large rivers (references in Hynes 1970), the great mass of the work that has been done on running water has been on streams and small rivers, and information on larger rivers is either on such limited topics as fisheries or plankton, scattered among the journals, or not available to the general limnologist. The only exceptions are a few books in this series of publications, such as those on the Nile (Rz6ska 1976), the Volga (Morduckai Boltovskoi 1979) and the Amazon {Sioli 1984), and the recent compendium by Whitton (1984) on European rivers, among which there are a few that rate as large.
Lake Chilwa
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Author : M. Kalk
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Lake Chilwa written by M. Kalk 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.
Leonard C. Beadle In contrast to the more sta bie oceans, inland waters are, on the geological time scale, short-lived and are subject to great fluctuations in chemical composition and physical features. Very few lakes and rivers have existed continuously for more than a million years, and the life of the majority is to be measured in thousands or less. Earth movements, erosion and long-term climatic changes in the past have caused many of them to appear and disappear. No wonder then that most freshwater organism are especially adapted to great changes and many even to temporary extinction of their environment. Recent studies of residual sediments from existing and extinct lakes in tropical Africa have told us much about their age and the past history of their faunas and floras, from which we may deduce something about the climate and the conditions in the water in the past. The forces that have formed and moulded the African Great Lakes have been catastrophic in their violence and effects. They are not yet finished, but the present rate of change is, in human terms, too slow for direct observation of the ecological effects. The large man-made lakes are providing very good opportunities for studying the chemi cal and biological consequences of the initial filling but, once filled, they are artificially protected against major fluctuations.
The Ecology And Management Of African Wetland Vegetation
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Author : Patrick Denny
language : en
Publisher: Springer
Release Date : 1986-08-14
The Ecology And Management Of African Wetland Vegetation written by Patrick Denny and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986-08-14 with Science categories.
Interest in the biology of African 'wetlands' was initiated in the last century with the hypothesis that Lake Tanganyika was once part of a Jurassic sea, and was furthered by Cunnington's expedition at the beginning of this century which proved that it was not. In the late 1920's, ecological studies, encouraged by the growing importance of inland fisheries, were started hy British, French and Belgian biologists. Some twenty years later several government limnological research centres and fishery departments were established in tropical Africa, and scientific progress was accelerated. Scientific collaboration between the regions south of the Sahara was started formally in 1951 by the Scientific Council for Africa and stimulated by the International Biological Programme (1964-74) with its emphasis on biological productivity. Some of its interests were takcn on by SCOPE which recently selected continental wetlands as a Special Project; hence this book. The five authors, with-Patrick Denny as editor, have made a very valuable contribution both to science and to thc management of Africa's natural rcsourccs: thcy have filled a gap in the synthesis of knowledge about Africa's environments which is long overdue. The term 'wetland' is used today in several different contexts. For this purpose, it excludes the seas and large open inland waters. which are too deep for rooted plants, but includes the huge areas of floodplains and dambos which may change seasonally from standing water to very dry lands.
Lake Sibaya
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Author : B.R. Allanson
language : en
Publisher: Springer Science & Business Media
Release Date : 1979-12-31
Lake Sibaya written by B.R. Allanson 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 1979-12-31 with Science categories.
The World Water Balance
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Author : Albert Baumgartner
language : en
Publisher: Elsevier Science & Technology
Release Date : 1975
The World Water Balance written by Albert Baumgartner and has been published by Elsevier Science & Technology this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Science categories.
The Bird Faunas Of Africa And Its Islands
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Author : Reginald Ernest Moreau
language : en
Publisher:
Release Date : 1966
The Bird Faunas Of Africa And Its Islands written by Reginald Ernest Moreau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Nature categories.
The Haplochromine Fishes Of The East African Lakes
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Author : Peter Humphry Greenwood
language : en
Publisher: Krause Publications
Release Date : 1981
The Haplochromine Fishes Of The East African Lakes written by Peter Humphry Greenwood and has been published by Krause Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.
Intermediate Hosts Of Schistosoma
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Author : G. Mandahl-Barth
language : en
Publisher:
Release Date : 1958
Intermediate Hosts Of Schistosoma written by G. Mandahl-Barth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1958 with Biomphalaria categories.