Download or read book Fish and Invertebrates of Revetments and Other Habitats in the Willamette River Oregon written by Randy C. Hjort and published by . This book was released on 1984 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental and Water Quality Operational Studies Fish and Invertebrates of Revetments and Other Habitats in the Willamette River Oregon written by R. C. Hjort and published by . This book was released on 1984 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, physical and biological parameters were compared at revetments and other aquatic habitats in the Willamette River below Salem, Oregon. The purpose was to determine if revetments affect the distribution and abundance of fishes and invertebrates, and to examine relationships between the physical parameters and the biological community. Sampling sites included two revetments, two natural banks, two side channels, and an abandoned channel. The study was conducted in 1982 at two flow levels. Sampling periods were June when flows were moderate (283-425 cu m/sec) and August when flows were low (221-238 cu m/sec). The physical parameters included water quality indices (temperature, dissolved oxygen, pH, redox potential, turbidity, and conductivity), water velocity, and sediment analysis. The biological parameters were fish and invertebrate densities and fish weight. During each study period, water quality indices were similar at all stations except for those in the abandoned channel, which was generally higher in water temperatures and conductivities and more variable in dissolved oxygen. Water temperatures and turbidities were higher during the August sampling period compared to June. Water current velocities were highest at the natural bank sites followed by the revetments and secondary channels. The abandoned channel had little or no water flowing through it.
Download or read book Summary of Information on Aquatic Biota and Their Habitats in the Willamette Basin Oregon Through 1995 written by Bob Altman and published by . This book was released on 1997 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of Information on Aquatic Biota and Their Habitats in the Willamette Basin Oregon Through 1995 written by Bob Altman and published by . This book was released on 1997 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water resources Investigations Report written by and published by . This book was released on 1997 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book River Quality written by David A. Dunnette and published by CRC Press. This book was released on 2018-05-04 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is involved in restoring a river? River Quality: Dynamics and Restoration answers this question through a series of articles and case studies written by some of the field's leading researchers and practitioners. The first part of the book covers the physical, chemical, and biological dynamics of a river system. The second part describes monitoring programs and remedial measures used to restore river systems back to healthy and functional states. The Willamette River in Oregon and the Vistula River in Poland are used to illustrate the dynamic and restoration processes. Each river is in a different stage of restoration and is subjected to different degrees of stress from agriculture, industry, and urbanization. The Willamette is an internationally cited example of a restored river, while the Vistula is a river that has just recently begun the restoration process. Contrasts and comparisons of the two river systems enable readers to learn the limitations of restoration processes and what is involved in the different stages of restoration.
Download or read book Proceedings of the Fifth Federal Interagency Sedimentation Conference 1991 written by Shou-shan Fan and published by . This book was released on 1991 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book River Ecology and Management written by Robert Naiman and published by Springer Science & Business Media. This book was released on 2001-02-16 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the vast expanses of natural forests and the great populations of salmonids are harvested to support a rapidly expanding human population, the need to understand streams as ecological systems and to manage them effectively becomes increasingly urgent. The unfortunate legacy of such natural resource exploitation is well documented. For several decades the Pacific coastal ecoregion of North America has served as a natural laboratory for scientific and managerial advancements in stream ecology, and much has been learned about how to better integrate ecological processes and characteristics with a human-dominated environment. These in sightful but hard-learned ecological and social lessons are the subject of this book. Integrating land and rivers as interactive components of ecosystems and watersheds has provided the ecological sciences with impor tant theoretical foundations. Even though scientific disciplines have begun to integrate land-based processes with streams and rivers, the institutions and processes charged with managing these systems have not done so successfully. As a result, many of the watersheds of the Pacific coastal ecoregion no longer support natural settings for environmental processes or the valuable natural resources those processes create. An important role for scientists, educators, and decision makers is to make the integration between ecology and con sumptive uses more widely understood, as well as useful for effective management.
Download or read book Oregon Chub Oregonichthys Crameri written by and published by . This book was released on 1998 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book COMPARISON OF HABITATS NEAR SPUR DIKES CONTINUOUS REVETMENTS AND NATURAL BANKS FOR LARVAL JUVENILE AND ADULT FISHES OF THE WILLAMETTE RIVER written by Hiram W. Li and published by . This book was released on 1984 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Effects of Dikes and Revetments on Large Riverine Systems written by Mark B. Sandheinrich and published by . This book was released on 1986 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of pertinent research, suggests that dikes and revetments have short-term and long-term effects on major riverine ecosystems. Short-term effects may be beneficial and include increases in aquatic habitat diversity physical stability which, in turn, results in high densities and diversities of fish and macroinvertebrates within the main stem of the river. Dike fields are intermediate physically, chemically, and biologically to the main channel and backwaters of rivers. Dike fields often support the most diverse fish and macroinvertebrate community of any habitat within the river. But community composition is less stable than backwaters and is dependent upon river stage and water velocity. Moderate and slow-water areas within dike fields provide important spawning and nursery areas for many lotic species of fish within the modified river. Revetments of broken rock stabilize banks and provide additional hard substrate for colonization by dense populations of invertebrates. Interstitial spaces between rocks may provide areas of moderate flow for juvenile and forage fish. Long-term effects of river training structures may be detrimental to the biotic integrity of the river.
Download or read book Folsom Dam and Reservoir Reoperation written by and published by . This book was released on 1992 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Water Quality Operational Studies written by and published by . This book was released on 1984-04 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sacramento River Bank Protection Project written by and published by . This book was released on 1973 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book List of Publications of the U S Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1993 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fish and Amphibian Use of Intermittent Streams Within the Upper Willamette Basin Oregon written by Randall William Colvin and published by . This book was released on 2005 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the fall through spring of 2002/03 and 2003/04, the composition of fish and amphibian communities were examined in intermittent streams in the upper Willamette river basin in western Oregon. I recorded standard aquatic habitat variables and water nutrient concentrations (nitrate and phosphate) and correlated them with fish and amphibian communities present. Fish and amphibian communities were also compared between seasons (winter and spring), capture method (minnowtrap and backpack electrofishing) and channel morphology (incised and gently sloping channels). Fish were tagged with visual implant elastomer to assess movement and distribution. Fourteen species of fish and five species of amphibians were present in these habitats over two field seasons. Fish and amphibian species composition and abundance was correlated with characteristics of the upper Willamette basin. The regional characteristics associated with the differences were a) the amount of the watershed covered in forest and b) upstream slope; whereas mean maximum water velocity separated fish dominated communities from amphibian dominated communities. Approximately 99% of fish and amphibian species caught were native to the Willamette river basin and the number of fish species decreased as the sampling distance from perennial water increased. Significant differences were found in fish and amphibian community composition between winter and spring and between capture methods. Surface/mid-water feeding fish were more abundant in gently sloping channels than benthic feeding fishes. Only 2.6% of the 498 tagged fish were recaptured between December and April. In the fall through spring 2003/04, the composition of fish communities and their invertebrate diets were compared between 12 sites on four intermittent streams. The distance between consecutive sites was approximately 900 to 1500-m. Two intermittent streams had incised channels, confining high flows to a narrow channel. The remaining two streams had gently sloping channels, where flood waters had access to the floodplain. Two hundred and thirty individual diets were sampled from cutthroat trout, northern pikeminnow, redside shiner, sculpin, speckled dace, threespine stickleback in both winter and spring. About 60% of the stomach samples contained invertebrates and approximately 90% of them were aquatic species. There was a significant difference in the numbers of invertebrates consumed by redside shiners, sculpins and speckled dace. These three fish species fed most often on benthic invertebrates compared to surf ace/midwater invertebrates, but only sculpins and redside shiners were significantly different. However, the proportions of benthic and surface/midwater invertebrates in the diet of these fish species were not significantly different between seasons or channel types. This thesis inventories fish and amphibian species found in intermittent stream habitats of the upper Willamette basin, and identifies the main habitat features that influence the distribution of those species. It also examines the diet composition of a subset of widely distributed fish species. The findings of this study can be used to understand how land uses, such as grass seed agriculture, affect intermittent streams, and to design future studies on the effectiveness of habitat enhancement conservation practices (such as grassed waterways, residue management, filter strips, streambank protection, etc.) to improve and/or protect these important seasonal habitats in the upper Willamette basin.
Download or read book Rivers of North America written by Arthur C. Benke and published by Elsevier. This book was released on 2011-09-06 with total page 1168 pages. Available in PDF, EPUB and Kindle. Book excerpt: AWARDS:2006 Outstanding Academic Title, by CHOICEThe 2005 Award for Excellence in Professional and Scholarly Publishing by the Association of American Publishers (AAP) Best Reference 2005, by the Library JournalRivers of North America is an important reference for scientists, ecologists, and students studying rivers and their ecosystems. It brings together information from several regional specialists on the major river basins of North America, presented in a large-format, full-color book. The introduction covers general aspects of geology, hydrology, ecology and human impacts on rivers. This is followed by 22 chapters on the major river basins. Each chapter begins with a full-page color photograph and includes several additional photographs within the text. These chapters feature three to five rivers of the basin/region, and cover several other rivers with one-page summaries. Rivers selected for coverage include the largest, the most natural, and the most affected by human impact. This one-of-a-kind resource is professionally illustrated with maps and color photographs of the key river basins. Readers can compare one river system to another in terms of its physiography, hydrology, ecology, biodiversity, and human impacts.* Extensive treatment provides a single source of information for North America's major rivers* Regional specialists provide authoritative information on more than 200 rivers* Full-color photographs and topographical maps demonstrate the beauty, major features, and uniqueness of each river system* One-page summaries help readers quickly find key statistics and make comparisons among rivers
