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Book Secondary Production Rates Consumption Rates and Trophic Basis of Production of Fishes in the Colorado River Grand Canyon AZ

Download or read book Secondary Production Rates Consumption Rates and Trophic Basis of Production of Fishes in the Colorado River Grand Canyon AZ written by Kevin Christopher Donner and published by . This book was released on 2011 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Regulation of the flows of large rivers has contributed to the decline and extirpation of native fishes worldwide. The impact of altered physical habitats on fishes in these rivers is well studied however, the potential impact of altered food resources and competition for food is relatively unknown. I investigate fish assemblage secondary production rates, consumption rates, trophic basis of production, and coefficients of potential competition for food in a regulated section of the Colorado River. Simuliidae and Chironomidae fueled 41-57% of secondary production by the entire fish assemblage at all sites. Competition coefficients between individual species and the fish assemblage exceeded 1 for six of ten species indicating strong potential of competition for food. Simplified trophic basis of production and competition for depauperate food resources in regulated rivers potentially results in unstable food web structure and may partly explain erratic shifts in abundance or extirpation of native fishes.

Book Aquatic Study

Download or read book Aquatic Study written by and published by . This book was released on 1980 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Lost a Desert River and Its Native Fishes

Download or read book Lost a Desert River and Its Native Fishes written by Gordon Mueller and published by . This book was released on 2002 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Colorado River had one of the most unique fish communities in the world. Seventy-five percent of those species were found nowhere else in the world. Settlement of the lower basin brought dramatic change to both the river and its native fish. Those changes began more than 120 years ago as settlers began stocking nonnative fishes. By 1930, nonnative fish had spread throughout the lower basin and replaced native communities. All resemblance of historic river conditions faded with the construction of Hoover Dam in 1935 and other large water development projects. Today, few remember what the Colorado River was really like. Seven of the nine mainstream fishes are now Federally-protected as endangered. Federal and state agencies are attempting to recover these fish. However, progress has been frustrated due to the severity of human impact. This report represents testimony, old descriptions, and photographs describing the changes that have taken place in hopes that it will provide managers, biologists, and the interested public a better appreciation of the environment that shaped these unique fish.

Book Annotated Bibliography for Aquatic Resource Management of the Upper Colorado River Ecosystem

Download or read book Annotated Bibliography for Aquatic Resource Management of the Upper Colorado River Ecosystem written by and published by . This book was released on 1980 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of water and other natural resources in the Upper Colorado River Basin will continue to have an impact on the ecology of this unique ecosystem. Numerous water-development projects have been completed on the river, others are in progress, and still others are contemplated, to provide water necessary for municipalities, irrigated agriculture, and energy production. Although much information is already available on this river, it is widely scattered in the published literature and unpublished reports of various state and federal agencies. This annotated bibliography contains 1,109 published or readily available unpublished references that should be useful in decisions regarding effective management of the Upper Colorado River Basin. Selected key words were assigned to all references and indexed for ease of locating references on particular subjects.

Book Report

Download or read book Report written by Upper Colorado River Commission and published by . This book was released on 1953 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Colorado River Fish Monitoring in Grand Canyon Arizona

Download or read book Colorado River Fish Monitoring in Grand Canyon Arizona written by Andrew S. Makinster and published by . This book was released on 2010 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Controlled Flood in Grand Canyon

Download or read book The Controlled Flood in Grand Canyon written by Robert H. Webb and published by American Geophysical Union. This book was released on 1999-01-26 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 110. The natural flow of almost every river in the United States has been modified to meet various socioeconomic goals—navigation, irrigation, power generation and flood control. The success of the dams and reservoirs built to achieve these goals has been accompanied by changes in the status of riverine resources downstream, a cause of growing environmental and ecological concern. For example, before Glen Canyon Dam was completed, the Colorado River transported large quantities of sediment in floods as large as 8500 m3/s. After the dam was closed in 1963, dam releases typically were less than the powerplant capacity of 890 m3/s and exhibited large daily flow fluctuations. The river carried little sediment. The daily fluctuations in flow eroded sand bars, and the smaller, controlled flow did not redeposit them. The clear, cold water resulted in increased aquatic productivity such that rainbow trout and other nonnative fishes thrived while most native species were lost or endangered.

Book Habitat Relationships of Small Bodied Fish in the Grand Canyon Reach of the Colorado River Arizona

Download or read book Habitat Relationships of Small Bodied Fish in the Grand Canyon Reach of the Colorado River Arizona written by Michael James Dodrill and published by . This book was released on 2012 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many management actions in aquatic ecosystems are directed at restoring or improving specific habitats to improve fish growth and survival. In the Grand Canyon reach of the Colorado River, experimental flow operations as part of the Glen Canyon Dam Adaptive Management Program often consider the creation of sandbars and associated backwater habitats as critical for juvenile native fish conservation. These habitats are thought to be warmer and more similar to the pre-dam environment thus providing areas for improved growth and survival for native fish. Previous research has demonstrated that both native and nonnative fishes occur in backwater habitats, including the federally endangered humpback chub Gila cypha, yet little is known about the distribution of fish among other habitat types.

Book Entomology Abstracts

Download or read book Entomology Abstracts written by and published by . This book was released on 2001 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Dissertation Abstracts International

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Dams and Rivers

Download or read book Dams and Rivers written by Michael Collier and published by . This book was released on 1996 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Outlines the role of science in restoring or otherwise altering unwanted downstream effects of dams, including eroding river banks, changes in waterfowl habitat, threats to safe recreational use, and the loss of river sand bars, examining seven selected areas of the country -- the upper Salt River in central Arizona; the Snake River in Idaho, Oregon and Washington; the Rio Grande in New Mexico and Texas; the Chattahoochee River in Georgia; the Platte River in Wyoming, Colorado and Nebraska; the Green River in Utah; and the Colorado River in Arizona -- to focus on specific downstream effects of dams and the management issues related to their operation.