Fish Assemblages in Iowa's Non-wadeable Rivers PDF Download

Author: Travis Edward Neebling
Publisher:
ISBN:
Category :
Languages : en
Pages : 123

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Author: Timothy Patrick Parks
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 0

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Author: David Charles Rowe
Publisher:
ISBN:
Category :
Languages : en
Pages : 143

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Book Description
Fish assemblages play a key role in stream ecosystems, and play a crucial role in the assessment of stream health. Physical habitat is a key component of stream ecosystems and plays a major role in determining biotic assemblages and stream integrity. There is increasing recognition of the role landscape factors play in determining biotic assemblages and stream integrity. Landscapes in Iowa and other Midwestern states have been profoundly altered by conversion of native prairies and wetlands to agriculture. We analyzed fish assemblages, physical habitat and landscape characteristics from 93 randomly selected sites on wadeable Iowa streams to explore relationships between fish assemblage, reach scale physical habitat and landscape characteristics at multiple spatial scales. Non-metric multidimensional scaling ordination and stepwise multiple regression were used to explore, identify and quantify relationships. Ordination of sites by species abundance showed significant gradients related to stream size and stream health. Thirty variables were identified as significantly correlated to the ordination of fish assemblage and significantly differed between healthy and impaired sites. Eighteen variables of physical habitat were identified as predictors of fish assemblage metrics. Variables described channel morphology, channel cross section and bank morphology, residual pool volume, relative bed stability, large woody debris, riparian vegetation, fish cover, human disturbance and substrate composition. Fish assemblages in Iowa wadeable streams are associated with the quality of the instream physical conditions that constitute an important part of their habitat. Ordination of sites by physical habitat showed significant gradients of channel shape and habitat complexity, substrate composition and stream size. Land cover variables were strongly correlated with channel shape and habitat complexity, and catchment land area and gradient were correlated with stream size. Fish assemblage was associated with gradients of land cover and stream size. Our results support hierarchical stream system theory and support the view that landscape factors strongly influence mainly physical habitat characteristics in streams, and that in turn these physical habitat characteristics strongly influence stream fish assemblages.

Author: United States. Environmental Protection Agency. Office of Water
Publisher:
ISBN:
Category : Water quality bioassay
Languages : en
Pages : 344

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Author: Michael D. Delong
Publisher: Academic Press
ISBN: 0128188480
Category : Nature
Languages : en
Pages : 1109

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Book Description
Rivers of North America, Second Edition features new updates on rivers included in the first edition, as well as brand new information on additional rivers. This new edition expands the knowledge base, providing readers with a broader comparative approach to understand both the common and distinct attributes of river networks. The first edition addressed the three primary disciplines of river science: hydrology, geomorphology, and ecology. This new edition expands upon the interactive nature of these disciplines, showing how they define the organization of a riverine landscape and its processes. An essential resource for river scientists working in ecology, hydrology, and geomorphology. - Provides a single source of information on North America's major rivers - Features authoritative information on more than 200 rivers from regional specialists - Includes full-color photographs and topographical maps to illustrate the beauty, major features, and uniqueness of each river system - Offers one-page summaries help readers quickly find key statistics and make comparisons among rivers

Author: Iowa Cooperative Fish and Wildlife Research Unit
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 374

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Author: Seth Eugene Meek
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 42

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Author: Vaughn L. Paragamian
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 56

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Book Description

Author: Iowa State University
Publisher:
ISBN:
Category : Commencement ceremonies
Languages : en
Pages : 492

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Book Description

Author: Henry W. Robison
Publisher:
ISBN: 1682261034
Category : Nature
Languages : en
Pages : 995

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Book Description
The second edition of Fishes of Arkansas, in development for more than a decade, is an extensive revision and expansion of the first edition, including reclassifications, taxonomic changes, and descriptions of more than thirty new species. An invaluable reference for anyone interested in the state's fish population--from professional ichthyologists, fisheries biologists, and managers of aquatic resources, to amateur naturalists and anglers--this new edition provides updated taxonomic keys as well as detailed descriptions, photographs, and line drawings to aid identification of the state's 241 fish species. There is also much information on the distribution and biology of each species, including descriptions of habitat, foods eaten, reproductive biology, and conservation status. This project and the preparation of this publication was funded in part by a grant from the Arkansas Game and Fish Commission.