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The Population Dynamics Of Coho Salmon Oncorhynchus Kisutch In A West Coast Rain Forest Stream Subjected To Logging
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Book Synopsis The Population Dynamics of Coho Salmon (Oncorhynchus Kisutch) in a West Coast Rain Forest Stream Subjected to Logging by : L. B. Holtby
Download or read book The Population Dynamics of Coho Salmon (Oncorhynchus Kisutch) in a West Coast Rain Forest Stream Subjected to Logging written by L. B. Holtby and published by . This book was released on 1982 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Streamside Management by : Ernest Olavi Salo
Download or read book Streamside Management written by Ernest Olavi Salo and published by . This book was released on 1987 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Population Dynamics of the Coho Salmon and Its Response to Logging in Three Coastal Streams by : David Wah Kwai Au
Download or read book Population Dynamics of the Coho Salmon and Its Response to Logging in Three Coastal Streams written by David Wah Kwai Au and published by . This book was released on 1972 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examines the ecology and dynamics of coho salmon (Oncorhynchus kisutch) in environments experimentally altered by logging. The objective was to evaluate processes that stabilize or regulate the populations. Two small watersheds in Oregon's Coast Range were logged in 1966, one clear-cut, the other patch-cut. A third adjacent watershed was left uncut as a control. The influence of these treatments on the biology of the coho was assessed. Attention was concentrated on populations of the six year classes 1963 to 1968. The natural variability of streamflow-related conditions influencing both the magnitude and pattern of coho recruitment each year was increased in the logged watersheds. Peak flow during storms increased; intragravel dissolved oxygen levels decreased in the stream draining the clear-cut watershed. These changes, however, were apparently within the range of variation that the coho naturally experience. Increased stream temperatures and mortalities, due to the logging effects, altered the post-recruitment life conditions of the coho in that stream but did not significantly affect the final smolt yield. The nocturnal behavior of recently emerged fry leads to recruitment along the stream length. Fry tend to emerge en masse from the redds at night, and large numbers proceed immediately to disperse downstream. This migration continues for several successive nights, beginning each night soon after dark. Evidence is presented indicating that fry emigration is primarily a dispersal mechanism that distributes fry from redd sites to nursery areas. It is hypothesized that the series of events leading from fry dispersal to be quiescent behavior at night, characteristic of resident fry, is a developmental sequence involving the physiology and maturity of the fry, modified by agonistic activity. Adjustments in coho population size were largely accomplished by fall, resulting in stable and characteristic population levels in each stream. A stable smolt yield was a further result. These adjustments are accomplished through high mortality during the months of the first spring and summer. This mortality is likely density dependent and related to the territorial and agonistic behavior of the fish. Growth, biomass, and net production varied greatly during each year. Seasonal changes in growth rate resulted in seasonal variations in biomass that were in contrast to the stabilized trends of population number. The pattern of net production rate was also largely determined by the seasonal growth pattern, and like biomass, did not show: a tendency to stabilize with time. It averaged 5 g/m2 among the three streams for the period June 1 to April 15. The coho populations seem naturally regulated most importantly with respect to number. The patterns of biomass and rate of net production may be understood as an interaction of seasonally variable growth rate with stabilizing population numbers. This study has shown that coho streams normally produce characteristic levels of smolt yield in spite of large natural variations in fry input and conditions for growth. The range of environmental variation for which this result holds may include short-term changes due to logging. However a normal population response to such a severe alteration as occurred on Needle Branch is very likely conditional upon a program that at least includes vigorous stream clearance, the restriction of additional mortality to early summer, when population adjustments are far from complete, and the encouragement of streamside revegetation. A streamside buffer strip of trees is an effective way of protecting aquatic resources.
Book Synopsis Cushman Hydroelectric Project, North Fork Skokomish River, Mason County by :
Download or read book Cushman Hydroelectric Project, North Fork Skokomish River, Mason County written by and published by . This book was released on 1996 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee Publisher : ISBN 13 : Total Pages :496 pages Book Rating :4.0/5 ( download)
Book Synopsis Glossing Over the Truth about the Tongass National Forest by : United States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee
Download or read book Glossing Over the Truth about the Tongass National Forest written by United States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee and published by . This book was released on 1990 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :T. W. Chamberlin Publisher :Nanaimo, B.C. : Carnation Creek Steering Committee ISBN 13 : Total Pages :252 pages Book Rating :4.:/5 (319 download)
Book Synopsis Proceedings of the Workshop by : T. W. Chamberlin
Download or read book Proceedings of the Workshop written by T. W. Chamberlin and published by Nanaimo, B.C. : Carnation Creek Steering Committee. This book was released on 1988 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings, representing 17 years of results from the Carnation Creek watershed study, contains 17 technical papers about the physical and biological processes of the Carnation Creek ecosystem. After each session of technical papers, the proceedings contain commentaries from 6 panels of fish and forest agency staff and forest industry representatives. Finally, the verbatim questions and answers of the audience to each session of technical papers and panelists are also included so that the extent of understanding or uncertainties is preserved.
Book Synopsis Proceedings of the Carnation Creek Workshop by : G. F. Hartman
Download or read book Proceedings of the Carnation Creek Workshop written by G. F. Hartman and published by . This book was released on 1982 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Logging and Mass Wasting on Juvenile Salmonid Populations in Streams on the Queen Charlotte Islands by : D. B. Tripp
Download or read book The Effects of Logging and Mass Wasting on Juvenile Salmonid Populations in Streams on the Queen Charlotte Islands written by D. B. Tripp and published by Victoria, B.C.: Research Branch, Ministry of Forests. This book was released on 1992 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of logging and mass wasting on juvenile coho salmon and Dolly Varden char were assessed in streams on the Queen Charlotte Islands. Fish densities and habitat characteristics of 27-33 stream reaches were measured during summer and fall. Reach samples included undisturbed, unlogged old-growth forest, logged streams not directly affected by recent mass wasting (logged), and logged streams directly affected by recent debris torrents and slides (mass wasted). Overwinter survivals and smolt yields in three mass wasted and three non-mass wasted streams (all logged) were also estimated in a downstream spring fish trapping program, after determining the number of fish present in each stream the previous fall.
Book Synopsis Proceedings of the Western Association of Fish and Wildlife Agencies and the Western Division, American Fisheries Association by : Western Association of Fish and Wildlife Agencies (U.S.)
Download or read book Proceedings of the Western Association of Fish and Wildlife Agencies and the Western Division, American Fisheries Association written by Western Association of Fish and Wildlife Agencies (U.S.) and published by . This book was released on 1986 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Information Reports written by and published by . This book was released on 1981 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Western Association of Fish and Wildlife Agencies by : Western Association of Fish and Wildlife Agencies (U.S.)
Download or read book Proceedings of the Western Association of Fish and Wildlife Agencies written by Western Association of Fish and Wildlife Agencies (U.S.) and published by . This book was released on 1985 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Physical Habitats Limiting the Production of Coho Salmon in Western Oregon and Washington by : Gordon H. Reeves
Download or read book Identification of Physical Habitats Limiting the Production of Coho Salmon in Western Oregon and Washington written by Gordon H. Reeves and published by . This book was released on 1989 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influences of Forest and Rangeland Management on Salmonid Fishes and Their Habitats by : William R. Meehan
Download or read book Influences of Forest and Rangeland Management on Salmonid Fishes and Their Habitats written by William R. Meehan and published by . This book was released on 1991 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Canadian Technical Report of Fisheries and Aquatic Sciences by :
Download or read book Canadian Technical Report of Fisheries and Aquatic Sciences written by and published by . This book was released on 1988 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impacts of Clearcut Logging on the Fish and Wildlife Resources of Southeast Alaska by :
Download or read book Impacts of Clearcut Logging on the Fish and Wildlife Resources of Southeast Alaska written by and published by . This book was released on 1985 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Canadian Journal of Fisheries and Aquatic Sciences by :
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1990 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Workshop on Sediments, February 3-7, 1992, Corvallis, Oregon by :
Download or read book Technical Workshop on Sediments, February 3-7, 1992, Corvallis, Oregon written by and published by . This book was released on 1993 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: