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Population Dynamics Of The Coho Salmon And Its Response To Logging In Three Coastal Streams
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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 An Annotated Bibliography of the Effects of Logging on Fish of the Western United States and Canada by : Dave R. Gibbons
Download or read book An Annotated Bibliography of the Effects of Logging on Fish of the Western United States and Canada written by Dave R. Gibbons and published by . This book was released on 1974 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotations accompany 278 entries on logging effects on fish in the western U.S. (particularly the Pacific Northwest, California, and Alaska) and western Canada. An additional non-annotated 39 entries are listed.
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 Hydrological and Biological Responses to Forest Practices by : John D. Stednick
Download or read book Hydrological and Biological Responses to Forest Practices written by John D. Stednick and published by Springer Science & Business Media. This book was released on 2007-12-03 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Alsea Logging and Aquatic Resources Study, commissioned by the Oregon Legislature in 1959, marked the beginning of four decades of research in the Pacific Northwest devoted to understanding the impacts of forest practices on water quality, water quantity, aquatic habitat, and aquatic organism popu- tions. While earlier watershed research examined changes in runoff and erosion from various land uses, this study was the first watershed experiment to focus so heavily on aquatic habitat and organism response to forest practices. The Alsea Watershed Study, as it came to be known, extended over 15 years with seven years of pretreatment calibration measurements, a year of treatment, and seven years of post-treatment monitoring. The research was a cooperative effort with scientists from Oregon State University, Oregon Department of Fish and Wildlife, the U.S. Geological Survey, and the U.S. Environmental Protection Agency. Cooperating landowners included the Georgia-Pacific Corporation, the U.S. Forest Service, and a local rancher. It was a remarkable 15-year partnership marked by excellent cooperation among the participants and outstanding coordination among the scientists, many of whom participated actively for the entire period.
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 1310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spatial and Regional Analysis Methods in Forestry Economics by : Alex Obiya
Download or read book Spatial and Regional Analysis Methods in Forestry Economics written by Alex Obiya and published by . This book was released on 1986 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis User's Manual for a Computer Program for Simulating Intensively Managed Allowable Cut by : Robert W. Sassaman
Download or read book User's Manual for a Computer Program for Simulating Intensively Managed Allowable Cut written by Robert W. Sassaman and published by . This book was released on 1972 with total page 768 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 Government Reports Announcements by :
Download or read book Government Reports Announcements written by and published by . This book was released on 1974 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Index written by and published by . This book was released on 1972 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research Natural Areas in Oregon and Washington by : Sarah Greene
Download or read book Research Natural Areas in Oregon and Washington written by Sarah Greene and published by . This book was released on 1986 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecology and the Environment by : University Microfilms International
Download or read book Ecology and the Environment written by University Microfilms International and published by . This book was released on 1976 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Grant-in-Aid for Fisheries Program Activities by : United States. National Marine Fisheries Service
Download or read book Grant-in-Aid for Fisheries Program Activities written by United States. National Marine Fisheries Service and published by . This book was released on 1973 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alsea Watershed Study by : John R. Moring
Download or read book Alsea Watershed Study written by John R. Moring and published by . This book was released on 1975 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Grant-in-aid for Fisheries Program Activities by : United States. National Marine Fisheries Service
Download or read book Grant-in-aid for Fisheries Program Activities written by United States. National Marine Fisheries Service and published by . This book was released on 1972 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fishery Research Report written by and published by . This book was released on 1965 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: