Author: Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 436
Book Description
Special Scientific Report
Author: General Technical Report PNW-GTR
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 598
Book Description
Horizontal and Vertical Distribution of Juvenile Salmonids in Upper Mayfield Reservoir, Washington
Author: Jim Ross SmithPublisher:
ISBN:
Category : Fishes
Languages : en
Pages : 286
Book Description
N.O.A.A. Technical Report NMFS SSRF
Author: Return to the River
Author: Richard N. WilliamsPublisher: Elsevier
ISBN: 0080454305
Category : Science
Languages : en
Pages : 720
Book Description
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. - A 15 year collaboration by a diverse group of scientists working on the management and recovery of salmon, steelhead trout, and wildlife populations in the Pacific Northwest - Includes over 200 figures, with four-color throughout the book - Discusses complex issues such as habitat degradation, juvenile survival through the hydrosystem, the role of artificial production, and harvest reform
Sea-bottom Photographs and Macrobenthos Collections from the Continental Shelf Off Massachusetts
Author: Roland L. WigleyPublisher:
ISBN:
Category : Benthos
Languages : en
Pages : 670
Book Description
Fishery Leaflet
Author: List of Special Scientific Reports and Special Scientific Report--fisheries of the U.S. Fish and Wildlife Service
Author: U.S. Fish and Wildlife ServicePublisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 56
Book Description
Historical Changes in Stream Habitats in the Columbia River Basin
Author: Bruce A. McIntoshPublisher:
ISBN:
Category : Aquatic habitats
Languages : en
Pages : 388
Book Description
Knowledge of how stream habitats change over time in natural and human-influenced ecosystems at large, regional scales is currently limited. A historical stream survey (1934-1945) was compared to current surveys to assess changes in poo1 habitats in the Columbia River basin. Streams from across the basin, representing a wide range of geologies, stream sizes and land-use histories, were used to evaluate habitat change. We classified streams as managed or unmanaged, based on their land-use histories. Managed basins were watersheds managed predominantly for multiple-use (e.g., timber harvest, livestock grazing) and unmanaged basins were minimally affected by human disturbance (e.g., wilderness/roadless areas). The quantity and quality of pool habitats increased or remained the same in unmanaged streams, and decreased in managed streams since the 1930s. Despite differences in stream size and land-use history, the magnitude and direction of theses changes were consistent. In addition, the decrease in pool habitats did not differ between public and private lands. Ecoregions were used to assess regional patterns to these changes. Our analysis showed that pool habitats decreased in all Ecoregions except the North Cascades Ecoregion. Regional land-use histories were documented for the study streams. The overgrazing of most rangelands had been documented by 1900. Grazing practices began to change after 1930, but current information suggests that while uplands have improved, riparian areas have not. By World War II, stream habitats had been affected by the loss of riparian vegetation, large woody debris, and aquatic habitats due to splash dams, log drives, and riparian timber harvest. Timber harvest expanded to the uplands after World War II, as the demand for timber expanded. Rapidly developing road networks increased runoff and sedimentation, which continued the impact of timber harvest on already damaged stream ecosystems. Almost 90% of managed streams had roads along the channel or within the floodplain. "Stream improvements," such as channelization and stream cleaning, also affected stream ecosystems. We concluded that the chronic and persistent effects of land-use practices had simplified stream channels and reduced habitat complexity in most managed watersheds in the Columbia River basin
Author: