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Influences Of Elevation Stream Size And Land Use On Structure Function And Production Of Benthic Macroinvertebrate Communities In Two Southern River Ecosystems
Download Influences Of Elevation Stream Size And Land Use On Structure Function And Production Of Benthic Macroinvertebrate Communities In Two Southern River Ecosystems full books in PDF, epub, and Kindle. Read online Influences Of Elevation Stream Size And Land Use On Structure Function And Production Of Benthic Macroinvertebrate Communities In Two Southern River Ecosystems ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Influences of Elevation, Stream Size, and Land Use on Structure, Function, and Production of Benthic Macroinvertebrate Communities in Two Southern River Ecosystems by : Jack William Grubaugh
Download or read book Influences of Elevation, Stream Size, and Land Use on Structure, Function, and Production of Benthic Macroinvertebrate Communities in Two Southern River Ecosystems written by Jack William Grubaugh and published by . This book was released on 1994 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impacts of Land Use on the Habitat and Macroinvertebrate Assemblage of the Tributaries of the Lower Brazos River by : Frances Patricia Lash
Download or read book Impacts of Land Use on the Habitat and Macroinvertebrate Assemblage of the Tributaries of the Lower Brazos River written by Frances Patricia Lash and published by . This book was released on 2011 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecological research on stream and river ecosystems aims to gain an understanding of the dynamic and complex impacts of environmental factors on biotic communities within riverine landscape (riverscape). Human activities significantly impact both terrestrial and aquatic ecosystems. Local environmental factors are known to influence the structure and function of stream ecosystems and biodiversity. The patterns of benthic macroinvertebrate distribution are related to the natural and human influenced variation of environmental factors. Ecologists assess stream physical and biological conditions in response to human land use activities using ecological indicators. This study is an assessment of the ecological condition of the Lower Brazos River Watershed. Macroinvertebrate assemblage structure was compared from 33 sites within the 6 subbasins differing in land use type and degree. Land use within the subbasins was measured using data from the National Land Use Database. Benthic macroinvertebrate samples were collected and a variety of physiochemical variables were measured. Multivariate analysis grouped the subbasins using habitat variables and macroinvertebrate assemblages. Decreasing habitat heterogeneity resulted in a decline of diversity and richness of organisms. Differences in the richness and diversity of the macroinvertebrate assemblages are attributed to habitat structure and land use. This study highlights the importance of considering both local habitat and landscape parameters of watersheds in stream biological assessments to understand the response of benthic communities to disturbances.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1995 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Stream Habitat and Land Use on Benthic Macroinvertebrate Indicators of Stream Quality of Selected Above-tidal Streams in the Houston-Galveston Area Council Service Area, Texas, 1997-98 by : James Bruce Moring
Download or read book Influence of Stream Habitat and Land Use on Benthic Macroinvertebrate Indicators of Stream Quality of Selected Above-tidal Streams in the Houston-Galveston Area Council Service Area, Texas, 1997-98 written by James Bruce Moring and published by . This book was released on 2001 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Nile written by Henri J. Dumont and published by Springer Science & Business Media. This book was released on 2009-05-06 with total page 819 pages. Available in PDF, EPUB and Kindle. Book excerpt: What have we learnt about the Nile since the mid-1970s, the moment when Julian Rzóska decided that the time had come to publish a comprehensive volume about the biology, and the geological and cultural history of that great river? And what changes have meanwhile occurred in the basin? The human popu- tion has more than doubled, especially in Egypt, but also in East Africa. Locally, industrial development has taken place, and the Aswan High Dam was clearly not the last major infrastructure work that was carried out. More dams have been built, and some water diversions, like the Toshka lakes, have created new expanses of water in the middle of the Sahara desert. What are the effects of all this on the ec- ogy and economy of the Basin? That is what the present book sets out to explore, 33 years after the publi- tion of “The Nile: Biology of an Ancient River”. Thirty-seven authors have taken up the challenge, and have written the “new” book. They come from 13 different countries, and 15 among them represent the largest Nilotic states (Egypt, Sudan, Ethiopia, Uganda, and Kenya). Julian Rzóska died in 1984, and most of the - authors of his book have now either disappeared or retired from research. Only Jack Talling and Samir Ghabbour were still available to participate again.
Book Synopsis Riparian Areas by : National Research Council
Download or read book Riparian Areas written by National Research Council and published by National Academies Press. This book was released on 2002-10-10 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Clean Water Act (CWA) requires that wetlands be protected from degradation because of their important ecological functions including maintenance of high water quality and provision of fish and wildlife habitat. However, this protection generally does not encompass riparian areasâ€"the lands bordering rivers and lakesâ€"even though they often provide the same functions as wetlands. Growing recognition of the similarities in wetland and riparian area functioning and the differences in their legal protection led the NRC in 1999 to undertake a study of riparian areas, which has culminated in Riparian Areas: Functioning and Strategies for Management. The report is intended to heighten awareness of riparian areas commensurate with their ecological and societal values. The primary conclusion is that, because riparian areas perform a disproportionate number of biological and physical functions on a unit area basis, restoration of riparian functions along America's waterbodies should be a national goal.
Book Synopsis Land-use Changes and the Physical Habitat of Streams by : Robert B. Jacobson
Download or read book Land-use Changes and the Physical Habitat of Streams written by Robert B. Jacobson and published by Geological Survey (USGS). This book was released on 2001 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Water Velocity on Aquatic Macroinvertebrate Functional Structure and Production in the Cache River in Southern Illinois by : Eric A. Scholl
Download or read book The Influence of Water Velocity on Aquatic Macroinvertebrate Functional Structure and Production in the Cache River in Southern Illinois written by Eric A. Scholl and published by . This book was released on 2013 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cache River, located in southern Illinois, faces a unique set of restoration challenges due to multiple anthropogenic modifications to the watershed. In 1915 the Cache River was disconnected and divided into two sub-watersheds, the upper Cache River (UCR) and the lower Cache River (LCR). This alteration has led to impairments in both sections of the Cache River. The UCR currently suffers from channel incision and wetland loss due to an increase in channel slope, while the LCR experiences decreased flows and related habitat degradation. Currently, watershed managers are proposing to restore a more natural flow regime to the LCR through some degree of hydrologic reconnection. Effects of small-scale differences are quantified in flow velocities on snag-dwelling aquatic macroinvertebrates in the UCR and LCR. This study was designed to provide critical information on potential ecological responses to proposed reconnection of the Cache River by examining the effects of flow on elements of ecosystem structure (macroinvertebrate community structure, diversity, richness, evenness, biomass, and abundance) and function (secondary production). Given the degraded water quality in the LCR, the ultimate fate of this production is not clear. The more natural flow regime in the UCR is likely driving many of the differences between the UCR and LCR that I observed, but relationships may be complex, as flow influences biota in numerous direct and indirect ways. This study is the first to examine the structure and function of macroinvertebrate communities prior to hydrologic restoration of a river. Results will assist resource managers in the justification, planning, and execution of hydrologic restoration in the Cache watershed. Given that many river restoration projects are not based on sound ecological information and principles, this project can also serve as a model for future river restoration efforts.
Book Synopsis Aquatic Insects of China Useful for Monitoring Water Quality by : John C. Morse
Download or read book Aquatic Insects of China Useful for Monitoring Water Quality written by John C. Morse and published by . This book was released on 1994 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Relationships Between Upstream Land Use at Multiple Spatial Scales and Benthic Macroinvertebrate Community Composition in the Deerfield River Watershed of Vermont and Massachusetts by : Jason Saltman
Download or read book Relationships Between Upstream Land Use at Multiple Spatial Scales and Benthic Macroinvertebrate Community Composition in the Deerfield River Watershed of Vermont and Massachusetts written by Jason Saltman and published by . This book was released on 2009 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, I examined relationships between land-use patterns and macroinvertebrate communities in 45 first through fourth-order stream reaches in four subwatersheds within a New England watershed. Land-use patterns were quantified in GIS at three spatial scales to determine the effect of scale on the strength of relationships between instream biological conditions and adjacent land-use conditions. A GIS was used to quantify forest, agricultural, and developed land use at three spatial scales, including the entire upstream catchment area and two sub-corridors. Macroinvertebrate communities were analyzed using a multimetric approach and a multivariate approach to relate community composition to land-use variables measured at each spatial scale. Among community metrics, richness, EPT richness, percent affinity, and total metric scores were significantly correlated with quantified land-use variables, including percent forest, percent agriculture, percent developed, and percent agriculture + developed at the upstream catchment scale. Land-use variables also showed significant correlations with community composition as indicated by ordination axes resulting from multivariate analysis. Results of the approaches were in general agreement with each other, each indicating that relationships between instream benthic conditions and adjacent land use were strongest at the entire-upstream-catchment scale. These results suggest that conditions and processes occurring at this scale appear to be more influential than are localized adjacent land-use conditions in shaping community composition and in-stream biological conditions.
Book Synopsis Effects of Land-use Change on Benthic Macroinvertebrates in the Upper Reaches of the Apies-Pienaar Catchment by : Joseph Alexander Mulders
Download or read book Effects of Land-use Change on Benthic Macroinvertebrates in the Upper Reaches of the Apies-Pienaar Catchment written by Joseph Alexander Mulders and published by . This book was released on 2015 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Urbanisation of catchment areas is a major cause of freshwater ecosystem degradation worldwide. As catchments become more developed and river ecosystems become increasingly engulfed in various land use activities, there is a growing need to understand these impacts on freshwater ecosystems. Benthic macroinvertebrates are extensively used as indicators of ecosystem health and have been an instrumental tool in ecosystem monitoring and management. The effects of changing land use on macroinvertebrates at a fine scale however, have not been extensively investigated. Therefore an investigation was conducted to compare chemical, physical and biological surface water quality parameters and aquatic macroinvertebrate community composition along the first 8 km of the Hartbeesspruit, which contains multiple land use types, in the upper Apies-Pienaar catchment in Gauteng, South Africa. Five sampling sites corresponding to changes in land use were sampled four times at six-week intervals from September 2013 to February 2014. Influential variables that were recorded included in-stream habitat, riparian cover, flow regime and surface water quality parameters. Physical surface water parameters that were tested in situ included pH, salinity, total dissolved solutes, temperature, clarity and conductivity. Ex situ surface water parameters that were tested included physical parameters (alkalinity and turbidity), chemical parameters (major ions, metal ions and nutrients), and biological parameters (bacteria, coliforms and Escherichia coli). Macroinvertebrates were sampled using Hester-Dendy artificial samplers, which, following a 6 week exposure period, were sampled three times from November 2013 to February 2014. Macroinvertebrates were identified to family level and counted. Macroinvertebrate community composition across sites was assessed through macroinvertebrate abundance, family richness, SASS score, ASPT, Shannon-Wiener index, Pielou s evenness, non-metric multidimensional scaling and Indval analyses. Nineteen families were collected, of which only three made up 80% of macroinvertebrates sampled. These families were Hirudinea, Chironomidae and Oligochaeta. Indices of macroinvertebrate community composition indicated a general increase in value from upstream to downstream which showed similar comparative variation between sites to physical water quality parameters (except temperature and clarity), major ions (except arsenic), the metal ion magnesium and nutrient sulphate. Surface water parameters showed patterns indicative of effects due to evaporation, dilution and connectivity of water flow along the stream due to the presence of dams and wetlands. Temperature was an important influence on macroinvertebrate abundance and family richness at a temporal scale. On a spatial scale the most influential parameters on macroinvertebrate composition were seen to be depth, turbidity and conductivity, and temperature to a lesser extent. The land use types that showed the greatest association with various assemblages were the urban, recreational and least transformed wetland land uses. Although major influential factors, this pattern was not seen to be strictly due to the input of contaminants arising from associated activities, nor the variation in physical characteristics, but rather the discontinuity in flow regime. It was concluded that at a fine scale, the strongest factors that influenced macroinvertebrate community composition along the Hartbeesspruit, was not land use type but rather the hydrological pathways of connectivity and stream flow that exist within the system. The hydrological pathways influenced values and concentrations of chemical and physical surface water parameters which in turn further influenced macroinvertebrate assemblages present.
Book Synopsis Effects of urban development on stream ecosystems in nine metropolitan study areas across the United States by : James F. Coles
Download or read book Effects of urban development on stream ecosystems in nine metropolitan study areas across the United States written by James F. Coles and published by . This book was released on 2012 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determining the Association Between the Structure of Stream Benthic Macroinvertebrate Communities and Agricultural Best Management Practices by : Roger Holmes (M.Sc.)
Download or read book Determining the Association Between the Structure of Stream Benthic Macroinvertebrate Communities and Agricultural Best Management Practices written by Roger Holmes (M.Sc.) and published by . This book was released on 2014 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Farmers have been encouraged to adopt more sustainable farming practices (BMPs) that mitigate adverse agricultural effects on the natural environment. However, the ability of BMPs to protect or restore riverine systems continues to be questioned due to limited evidence directly linking BMP use with improved ecological conditions. The exclusion of hydrological pathways in previous field studies may explain why a direct link has not yet been established. The goal of this study was to assess the association between benthic macroinvertebrate community structure and the number and location of agricultural BMPs. Macroinvertebrates and water chemistry were sampled in 30 headwater catchments in the Grand River Watershed. Catchments exhibited gradients of BMP use and location as measured by the degree of hydrologic connectedness. Stepwise ordination regressions and variance partitioning were used to determine which environmental variables (i.e., BMP metrics, water chemistry parameters, habitat characteristics, and land use variables) were associated with benthic macroinvertebrate community structure. Water chemistry parameters were negatively associated with BMP metrics suggesting BMPs were mitigating losses of nutrients and sediments. However, BMP abundance and location explained minimal variation in benthic macroinvertebrate structure within the 30 sampled catchments. The absence of a strong association between BMPs and benthic macroinvertebrates may indicate a need for greater numbers and targeted siting of BMPS to improve water quality beyond a threshold point that would allow recolonization of intolerant invertebrate taxa. Focusing of conservation goals on ecological conditions and the promotion of BMPs that enhance in-stream habitat may also be required.
Book Synopsis Benthic Macroinvertebrate Community Structure Along a Southern Appalachian Stream Continuum by : Debra Leslie Wohl
Download or read book Benthic Macroinvertebrate Community Structure Along a Southern Appalachian Stream Continuum written by Debra Leslie Wohl and published by . This book was released on 1994 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Benthic Barriers on Macroinvertebrate Communities by : Barry S. Payne
Download or read book Effects of Benthic Barriers on Macroinvertebrate Communities written by Barry S. Payne and published by . This book was released on 1993 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Restoration of Aquatic Ecosystems by : National Research Council
Download or read book Restoration of Aquatic Ecosystems written by National Research Council and published by National Academies Press. This book was released on 1992-01-01 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aldo Leopold, father of the "land ethic," once said, "The time has come for science to busy itself with the earth itself. The first step is to reconstruct a sample of what we had to begin with." The concept he expressedâ€"restorationâ€"is defined in this comprehensive new volume that examines the prospects for repairing the damage society has done to the nation's aquatic resources: lakes, rivers and streams, and wetlands. Restoration of Aquatic Ecosystems outlines a national strategy for aquatic restoration, with practical recommendations, and features case studies of aquatic restoration activities around the country. The committee examines: Key concepts and techniques used in restoration. Common factors in successful restoration efforts. Threats to the health of the nation's aquatic ecosystems. Approaches to evaluation before, during, and after a restoration project. The emerging specialties of restoration and landscape ecology.
Download or read book Ecology Abstracts written by and published by . This book was released on 1998 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.
