[PDF] Rapports Et Proces Verbaux Des Reunions 1970 Aarhus Proceedings Of A Symposium Held In Aarhus 7 1 0 July 1970 eBook

Author : Frederick T. Short
Publisher : Univ of California Press
Page : 336 pages
File Size : 40,56 MB
Release : 2003
Category : Nature
ISBN : 9780520240476

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Seagrasses are a vital and widespread but often overlooked coastal marine habitat. This volume provides a global survey of their distribution and conservation status.

Author : Stig S. Gezelius
Publisher : Springer Science & Business Media
Page : 246 pages
File Size : 45,87 MB
Release : 2008-07-15
Category : Science
ISBN : 1402086288

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The state of the Northeast Atlantic fisheries in recent years has highlighted - plementation as the Achilles heel of modern fisheries management: discards and unreported or misreported landings are in many cases recognised to effectively subvert sound conservation goals. Social science literature on fisheries mana- ment has tended to regard the implementation of resource conservation policies mainly as a question of effective enforcement. This literature regards surveillance and penalty as the key mechanism through which fishermen keep to catch restr- tions and loyally report their catches. This book emerged because several years of research on fishermen’s compliance had made us uneasy about this rather narrow approach to the problem of implementation. This uneasiness motivated us to widen the approach to the question of implementing conservation policies in the fisheries. Taking Norway as an example, its fishing fleet consists of some 7,000 vessels spread along a coastline of more than 20,000 km, populated by less than 5 million people. The idea of ensuring desirable behaviour through surveillance and - forcement alone is almost absurd in such a context, as the task is impossible by any reasonable means. The Norwegian implementation system has thus had to rely heavily on the incentives provided by the rules and legitimacy created through a century of state/industry collaboration. Different coastal states face very different conditions in terms of solving typical implementation problems such as discards and misreporting.

Author : National Research Council
Publisher : National Academies Press
Page : 422 pages
File Size : 43,81 MB
Release : 2000-08-17
Category : Science
ISBN : 0309069483

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Environmental problems in coastal ecosystems can sometimes be attributed to excess nutrients flowing from upstream watersheds into estuarine settings. This nutrient over-enrichment can result in toxic algal blooms, shellfish poisoning, coral reef destruction, and other harmful outcomes. All U.S. coasts show signs of nutrient over-enrichment, and scientists predict worsening problems in the years ahead. Clean Coastal Waters explains technical aspects of nutrient over-enrichment and proposes both immediate local action by coastal managers and a longer-term national strategy incorporating policy design, classification of affected sites, law and regulation, coordination, and communication. Highlighting the Gulf of Mexico's "Dead Zone," the Pfiesteria outbreak in a tributary of Chesapeake Bay, and other cases, the book explains how nutrients work in the environment, why nitrogen is important, how enrichment turns into over-enrichment, and why some environments are especially susceptible. Economic as well as ecological impacts are examined. In addressing abatement strategies, the committee discusses the importance of monitoring sites, developing useful models of over-enrichment, and setting water quality goals. The book also reviews voluntary programs, mandatory controls, tax incentives, and other policy options for reducing the flow of nutrients from agricultural operations and other sources.

Author : Canadian Environmental Assessment Research Council
Publisher : [Hull, Que.] : CEARC
Page : 52 pages
File Size : 49,91 MB
Release : 1988
Category : Science
ISBN :

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Summary: "Cumulative effects associated with multiple activities can create irreversible changes in such systems or changes that are different in nature from those caused by any single activity or impact"--p. 1.

Author : J. M. Elliott
Publisher : Oxford University Press, USA
Page : 302 pages
File Size : 37,51 MB
Release : 1994-02-17
Category : Brown trout
ISBN : 0191588962

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This book provides, for the first time, a synthesiws of quantitative information on the ecology of the brown trout, including sea-trout, and comparisons with closely related species such as the Atlantic salmon, Pacific salmon, and rainbow trout. Much of this work, especially the case studies, is relevant to general problems in quantitative animal ecology as well as to fisheries management. One theme emphasized throughout is the development, testing, and use of realistic mathematical models as important tools for conservation and management of fish and other animals. - ;Covering not only brown trout, but also their close relatives, this book provides valuable information which is also relevant to animal ecology. The book highlights the global success of the species and provides a long-term case study of population dynamics of one population. It also considers growth and energetics, ecological differences between brown trout populations, natural selection and genetic differences between brown trout, and the mechanisms responsible for population regulation in juvenile trout. Emphasizing the value of such long-term studies to species management and conservation, the book stresses the importance of development, testing and use of realistic models when considering species such as brown trout. -