Download or read book Biophysical Factors Driving the Distribution and Abundance of Redband steelhead Trout Oncorhynchus Mykiss Gairdneri in the South Fork John Day River Basin Oregon USA written by Luis Francisco Madriñán and published by . This book was released on 2008 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall goal of this study was to identify multiple scales of habitat use and habitat electivity by redband/steelhead trout and define the limiting factors affecting the distribution patterns of this species during summer flows. The main objective in chapter 2 was to identify the most important habitat associations that control the distribution patterns of threatened populations of redband/steelhead trout in the South Fork John Day River Basin. I found that the factors influencing the distribution patterns of trout in the basin were dependent on the thermal context and spatial extent of analysis. The inclusion of water temperature alone at large spatial scales explained most of the distribution of trout at the basin scale and that channel morphology was a very important factor at small spatial scales. The main objective in chapter 3 was to identify geophysical factors influencing the distribution pattern of threatened populations of redband/steelhead trout in the basin at multiple spatial scales. I found that the trout distribution patterns in the area could be described as a clustered distribution, with a strong selection for upstream-cold water reaches and small, well oxygenated, running water pools. My study reveals that the most influential factor at large spatial scales was water temperature and smaller scale channel morphology. Chapter 4 examines whether longitudinal-summer-stream temperature profiles in semi arid-environment streams can be used to index carrying capacities of threatened populations of redband/steelhead trout. My results show that, in the South Fork John Day Basin, stream temperature can be used as indicator of trout carrying capacity. The distribution redband/steelhead trout in summer is largely determined by the- physiologically influenced-preference that individuals have for habitats within specific temperature ranges.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2014-05 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Using Network Models to Predict Steelhead Abundance Middle Fork John Day Or written by Monica R. Blanchard and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the management of threatened and endangered species, informed population estimates are essential to gage whether or not recovery goals are being met. In the case of Pacific salmonids, this evaluation often involves sampling a small subset of the population and scaling up to estimate larger distinct populations segments. This is made complicated by the fact that fish populations are not evenly distributed along riverscapes but respond to physical and biological stream properties at varying spatial extents. We used rapid assessment survey methods and the River Styles classification to explore fish-habitat relationships at a continuous network scale. Semi-continuous surveys were conducted across nine streams in the upper Middle Fork John Day River watershed and increased the number of sites surveyed eight-fold over other monitoring methods within the watershed. Using this increased sample size and continuous habitat metrics we improved watershed-wide steelhead (Oncorhynchus mykiss) abundance models. We first validated the distinctions among River Styles through a classification analysis using physical metrics measured at the rapid assessment sites. Overall classification accuracy, using a combination of reach and landscape scale metrics, was 88.3% and suggested that River Style classification was identifying variations in physical morphology within the watershed that was quantifiable at the reach scale. Leveraging the continuous River Styles classification of physical habitat and a continuous model of primary production improved the prediction of steelhead abundance across the network. Using random forest regressions, a model that included only habitat metrics resulted in R2 = 0.34, while using the continuous variables improved the model accuracy greatly to R2 = 0.65. Random forest allowed for further investigation into the predictor variables through the analysis of the partial dependence plots and identified a gross primary production threshold, below which production might be limiting steelhead populations. This method also identified the rarest River Style surveyed within the watershed, Confined-Valley Step Cascade, as the morphology that had the largest marginal effect on steelhead. The inherent physical properties and boundary conditions unique to each River Style has the potential to inform fish-habitat relationships across riverscapes and improve abundance estimates on a continuous spatial scale.
Download or read book Steelhead Production Factors written by Robert Bryan Lindsay and published by . This book was released on 1992 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steelhead Production Factors written by and published by . This book was released on 1983 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effectiveness of Livestock Exclosures in the Restoration of Steelhead onchorychus Mykiss Habitat and Populations in the John Day River Basin of Eastern Oregon written by Matthew Archibald and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: On March 25, 1999, the National Marine Fisheries Service (NMFS) listed the anadromous Oncorhynchus mykiss (O. mykiss), or steelhead, population in the Middle Columbia Evolutionarily Significant Unit (ESU) as threatened under the Endangered Species Act, and deemed that the federal Columbia River Hydropower System (FCRPS) posed jeopardy to this ESU. To mitigate for the impacts of the dams, the FCRPS Biological Opinion issued by NMFS, emphasized improving spawning and juvenile rearing habitat in the tributaries to achieve recovery of the population.
Download or read book Native Trout of Western North America written by Robert J. Behnke and published by . This book was released on 1992 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trout and Salmon of North America written by Robert Behnke and published by Simon and Schuster. This book was released on 2010-07-06 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This beautiful and definitive guide brings together the world's lead leading expert on North American trout and salmon, Robert Behnke, and the foremost illustrator in the field, Joseph Tomelleri. North America is graced with the greatest diversity of trout and salmon on earth. From tiny brook trout in mountain streams of the Northeast, to cutthroat trout in the rivers of the Rockies, to Chinook salmon of the Pacific, the continent is home to more than 70 types of trout and salmon. How this came to be, how they are related, and what makes them unique -- and so breathtaking -- is the story of Trout and Salmon of North America. The more than 100 illustrations of trout and salmon by Joseph Tomelleri showcased here exhibit a genius for detail, coloration, and proportion. Each portrait is made from field notes, streamside observations, photographs, and specimens collected by the artist. The result is a set of the most accurate and stunning illustrations of fish ever created. Robert Behnke has distilled 50 years of his research and writing about trout and salmon in completing this book. No one understands better than Behnke the diversity and conservation issues concerning these fishes or communicates so lucidly the biological wonders and complexities of their particular beauty. Also included are more than 40 richly detailed maps that clearly show the ranges of populations of trout and salmon throughout North America. An irresistible delight for anyone who appreciates natural history, Trout and Salmon of North America is a master guide to the natural elegance of our native fishes.
Download or read book Geology Geomorphology written by David Ambrose and published by . This book was released on 2005 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Channel Processes written by Asher P. Schick and published by . This book was released on 1984 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Genetics and Fishery Management written by Nils Ryman and published by . This book was released on 2009-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the first publication of "Population Genetics and Fishery Management" in 1987, significant technological, analytical, and conceptual changes have occurred. By explaining basic population genetics in a fisheries context, the text continues to serve as an excellent starting point for approaching complex recent developments.
Download or read book Grizzly Bear Recovery Plan written by Christopher Servheen and published by . This book was released on 1997 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grizzly Bear Recovery in the Bitterroot Ecosystem written by and published by . This book was released on 1997 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guidelines for the Promotion of Environmental Management of Coastal Aquaculture Development written by Uwe C. Barg and published by Food & Agriculture Org.. This book was released on 1992 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document is directed to aquaculture development specialists, coastal resource use planners and government officials involved and interested in the planning and management of coastal aquaculture development within the wider context of resource use in coastal areas. It is intended to serve in the promotion of environmental management of coastal aquaculture. Guidelines are given for improved environmental management of coastal aquaculture based on an overview of selected published experiences and concepts. Potential adverse environmental effects of and on coastal aquaculture practices are addressed with consideration of main socio-economic and bio-physical factors. Methodologies are presented for the assessment and monitoring of environmental hazards and impacts of coastal aquaculture. Selected environmental management options are described for application both at policy-level and farm-level.
Download or read book Who Owns the West written by William Kittredge and published by . This book was released on 1996 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, in "Departures," Kittredge turns his eye to the West today, the "new heartland nation" that is being born from the pain and the glory of the past and the struggles and anger of the present.
Download or read book Aggravations and Ameliorations written by and published by B. Jain Publishers. This book was released on with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
