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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... stocks (NPPC 1986; Nehlsen et al. 1991) (Chapter 4). Today, with few exceptions, most chum, pink, and wild coho stocks are extinct, and the other species are at risk of extinction. Nehlsen et al. (1991) identified 69 extinct stocks and ...
... stocks of anadromous salmonids in the Pacific Northwest and California. Fisheries 21:6–14. Independent Scientific Group (ISG). 1993. Critical uncertainties in the Columbia River Basin Fish and Wildlife Program. Bonneville Power ...
... stock in its natural state.” —M. C. Healey. 1994. Variation in the life history characteristics of Chinook salmon ... stocks in the Columbia Basin in the early 1990s, it is easy to look back at these historical management decisions as ...
... stocks (Lichatowich 1999). The causes for these declines were complex, but involved human activities such as habitat degradation, poor hatchery practices, overharvest, and barriers such as mainstem and tributary dams (Figure 3.1) that ...
... stocks and so ensure persistence is misguided. For example, over the long term, variable ocean conditions, when combined with continuous habitat degradation, can eventually lead to the demise of fish stocks, even though there may be ...
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Return to the River: Restoring Salmon to the Columbia River Richard Nicholas Williams Недоступно для просмотра - 2006 |