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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... temperature 100–10−1 system scour of stationary substrates; seasonal changes; accumulation of fines; macrophyte growth and cropping periphyton growth aSpace and time scales indicated are appropriate for a second- or third-order stream ...
... temperatures are moderated by interstitial flow. Relative to surface temperatures, ground water from the hyporheic zone is cool in the summer and warm in the winter. Regional patterns of hyporheic flow appear to be critical to rivers in ...
... temperature and ocean productivity (Chapter 10). Hilborn et al. (2003) indicate that conditions in freshwater habitats, such as water flow, lake levels, ice cover, and temperature, were associated with major shifts in the PDO index ...
... temperatures exceeding upper lethal limits for salmonids. ODFW 1990 John Day Juvenile Chinook salmon generally not found in the river Lindsay et al. where temperatures reach 68 ̊F. High stream temperature 1981; ODFW eliminates juvenile ...
... temperature level) describe the static-state conditions that are to be achieved through restoration (ISAB 2003). Traditional approaches to habitat restoration, such as the nearly universal reliance on placement of instream structures ...
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Return to the River: Restoring Salmon to the Columbia River Richard Nicholas Williams Недоступно для просмотра - 2006 |