Return to the River: Restoring Salmon Back to the Columbia RiverRichard N. Williams Elsevier, 21 нояб. 2005 г. - Всего страниц: 720 Return to the River will describe a new ecosystem-based approach to the restoration of salmon and steelhead populations in the Columbia River, once one of the most productive river basins for anadromous salmonids on the west coast of North America. The approach of this work has broad applicability to all recovery efforts throughout the northern hemisphere and general applicability to fisheries and aquatic restoration efforts throughout the world. The Pacific Northwest is now embroiled in a major public policy debate over the management and restoration of Pacific salmon. The outcome of the debate has the potential to affect major segments of the region's economy - river transportation, hydroelectric production, irrigated agriculture, urban growth, commercial and sport fisheries, etc. This debate, centered as it is on the salmon in all the rivers, has created a huge demand for information. The book will be a powerful addition to that debate.
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... survival of juvenile emigrants. 3c. There is a limited period of time within which yearling juvenile emigrants 2—3 must reach the estuary to successfully move from the freshwater to the marine phase of the life cycle. 4c. Yearling ...
... survival (Bottom 1997, Lichatowich 1999). Protection of biodiversity and the natural processes that maintained it were viewed as constraints on production optimization, rather than as legitimate management goals themselves (Cortner and ...
... survival and reproduction and accessible to organisms. Habitat connectivity provides the opportunity for species to reach habitats critical for completion of their life histories (Schlosser 1991) and is vitally important for (a) highly ...
... survival of anadromous fishes. Historically, in the development of management and restoration plans, as well as in the population models they used to set escapement and harvest levels, salmon managers acted as though ocean resources ...
... survival (p. 207).” We interpret Thompson's chain of interconnected habitats as temporal and spatial “pathways” through a diverse ecosystem (freshwater, estuarine, and marine). Salmonids following a particular chain of habitats—a ...
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Return to the River: Restoring Salmon to the Columbia River Richard Nicholas Williams Недоступно для просмотра - 2006 |