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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 324
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Book Description
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 324
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Book Description
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 1106
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Book Description
Author: United States. Bureau of Sport Fisheries and Wildlife
Publisher:
ISBN:
Category : Fish-culture
Languages : en
Pages : 32
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Book Description
Author: Robert E. Gresswell
Publisher:
ISBN:
Category : Cutthroat trout
Languages : en
Pages : 162
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Book Description
Author: Robert J. Behnke
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 310
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Book Description
Author: David Dudgeon
Publisher: Cambridge University Press
ISBN: 1108882625
Category : Nature
Languages : en
Pages : 517
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Book Description
Growing human populations and higher demands for water impose increasing impacts and stresses upon freshwater biodiversity. Their combined effects have made these animals more endangered than their terrestrial and marine counterparts. Overuse and contamination of water, overexploitation and overfishing, introduction of alien species, and alteration of natural flow regimes have led to a 'great thinning' and declines in abundance of freshwater animals, a 'great shrinking' in body size with reductions in large species, and a 'great mixing' whereby the spread of introduced species has tended to homogenize previously dissimilar communities in different parts of the world. Climate change and warming temperatures will alter global water availability, and exacerbate the other threat factors. What conservation action is needed to halt or reverse these trends, and preserve freshwater biodiversity in a rapidly changing world? This book offers the tools and approaches that can be deployed to help conserve freshwater biodiversity.
Author: Donald A. Duff
Publisher: DIANE Publishing
ISBN: 0788145673
Category :
Languages : en
Pages : 199
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Book Description
This document focuses on the current status, distribution and range for five subspecies of cutthroat trout Oncorhynchus clarki, which are found largely on national forest system lands and ecosystems in the Rocky Mountain and Intermountain West within the U.S. from the Canadian to the Mexican border. The 5 subspecies -- Westslope, Yellowstone, Bonneville, Rio Grande, and Colorado River cutthroat trout -- are designated either species of special concern or sensitive. These subspecies are presently restricted to a fragment of their former range. Includes assessment methods, and origins and taxonomic theory. Illustrated.
Author: Eleonora Trajano
Publisher: CRC Press
ISBN: 1439840482
Category : Science
Languages : en
Pages : 496
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Book Description
In most habitats, adaptations are the single most obvious aspects of an organism's phenotype. However, the most obvious feature of many subterranean animals are losses, not adaptations. Even Darwin saw subterranean animals as degenerates: examples of eyelessness and loss of structure in general. For him, the explanation was a straightforward Lamarc
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309097142
Category : Political Science
Languages : en
Pages : 505
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Book Description
For more than 100 years, the Coeur d' Alene River Basin has been known as "The Silver Valley" for being one of the most productive silver, lead, and zinc mining areas in the United States. Over time, high levels of metals (including lead, arsenic, cadmium, and zinc) were discovered in the local environment and elevated blood lead levels were found in children in communities near the metal-refining and smelter complex. In 1983, the U.S. Environmental Protection Agency (EPA) listed a 21-square mile mining area in northern Idaho as a Superfund site. EPA extended those boundaries in 1998 to include areas throughout the 1500-square mile area Coeur d'Alene River Basin project area. Under Superfund, EPA has developed a plan to clean up the contaminated area that will cost an estimated $359 million over 3 decades-and this effort is only the first step in the cleanup process. Superfund and Mining Megasites: Lessons from Coeur d'Alene River Basin evaluates the issues and concerns that have been raised regarding EPA's decisions about cleaning up the area. The scientific and technical practices used by EPA to make decisions about human health risks at the Coeur d'Alene River Basin Superfund site are generally sound; however, there are substantial concerns regarding environmental protection decisions, particularly dealing with the effectiveness of long-term plans.
Author: Peter B. Moyle
Publisher: Univ of California Press
ISBN: 9780520227545
Category : Nature
Languages : en
Pages : 542
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Book Description
Table of contents
