Temporal and spatial variation in the benthic invertebrate fauna of Lake George, Uganda PDF Download

Author: J P E C. Darlington
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Bryan R. Davies
Publisher: Springer Science & Business Media
ISBN: 9400955227
Category : Science
Languages : en
Pages : 268

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This book contains the Proceedings of the Symposium on Perspectives in Southern Hemisphere Limnology which was held from 3-13 July 1984 in Wilderness, South Africa. It can be asked why this Symposium was necessary at a time when conferences, symposia and other gatherings of learned people abound. Limnologists in the Southern Hemisphere have for some time been pointing out that limnological theory and inland water management practices have been developed almost exclusively in Northern Hemisphere temperate latitudes. Most of the land masses of the Southern Hemisphere fall within lower latitudes, 0 from 20-40 S, where the climate tends to be dry, with low cloud cover and with high levels of incident radiation and high water temperatures. Wide extremes are experienced in both rainfall and runoff, which occur mainly in summer. Sedimentary geological structures give rise to dispersive soils and highly turbid waters. Physiological, behavioural or developmental adaptations in the floral and faunal components are necessary to cope with desiccation and low visibility.

Author: John Francis Talling
Publisher: Cambridge University Press
ISBN: 9780521621151
Category : Nature
Languages : en
Pages : 456

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A synthesis of tropical freshwater systems which illustrates the basic theory of freshwater biology.

Author: Villy Christensen
Publisher: WorldFish
ISBN: 9711022842
Category : Aquatic ecology
Languages : en
Pages : 402

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Author: David S Brown
Publisher: CRC Press
ISBN: 0203481445
Category : Science
Languages : en
Pages : 687

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The first half of this book is primarily a systematic survey of the snails, beginning with glossaries, keys for identification to genera and a checklist of species. This is followed by a synopsis of species, with brief notes on ecology, distribution and parasites. Relationships are then described between snails and schistosomes and with other parasites. The book goes on to consider the factors affecting snail populations and possible methods for population control.

Author: M. Kalk
Publisher: Springer Science & Business Media
ISBN: 9400995946
Category : Science
Languages : en
Pages : 444

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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.

Author: J.P. Carmouze
Publisher: Springer Science & Business Media
ISBN: 9400972660
Category : Science
Languages : en
Pages : 584

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Author: Robert A. Francis
Publisher: Routledge
ISBN: 1136461248
Category : Science
Languages : en
Pages : 918

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Invasive non-native species are a major threat to global biodiversity. Often introduced accidentally through international travel or trade, they invade and colonize new habitats, often with devastating consequences for the local flora and fauna. Their environmental impacts can range from damage to resource production (e.g. agriculture and forestry) and infrastructure (e.g. buildings, road and water supply), to human health. They consequently can have major economic impacts. It is a priority to prevent their introduction and spread, as well as to control them. Freshwater ecosystems are particularly at risk from invasions and are landscape corridors that facilitate the spread of invasives. This book reviews the current state of knowledge of the most notable global invasive freshwater species or groups, based on their severity of economic impact, geographic distribution outside of their native range, extent of research, and recognition of the ecological severity of the impact of the species by the IUCN. As well as some of the very well-known species, the book also covers some invasives that are emerging as serious threats. Examples covered include a range of aquatic and riparian plants, insects, molluscs, crustacea, fish, amphibians, reptiles and mammals, as well as some major pathogens of aquatic organisms. The book also includes overview chapters synthesizing the ecological impact of invasive species in fresh water and summarizing practical implications for the management of rivers and other freshwater habitats.

Author: Fisheries Research Station (Sri Lanka)
Publisher:
ISBN:
Category : Aquatic biology
Languages : en
Pages : 136

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Author: Jean-Pierre Carmouze
Publisher:
ISBN:
Category : Biological productivity
Languages : en
Pages : 600

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