Using Comparisons of Macroinvertebrate Communities and Nutrient Concentrations as Water Quality Indicators in Two Rural Streams PDF Download
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Author: Dawn Connell
Publisher:
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Category :
Languages : en
Pages : 144
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Author: Dawn Connell
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Macroinvertebrates in urban streams in Ohio are potentially compromised by habitat loss, by the annual peak discharge event, and by degraded water quality. The Mill Creek in Southwest Ohio is a significantly channelized river that collects storm water runoff, wastewater treatment plant effluent, permitted dischargers, sanitary sewers, and combined sewers. Channelization areas have had 12-40 years to re-grow. Most of the riparian zone, although narrow, is lined with trees that shade the channel. The result is eutrophication by nutrient loading, some toxic chemical spills, and habitat simplification. This study was designed to show the relative impacts of habitat and water quality on the macroinvertebrate community in a multi-stressed urban stream. Possible limiting factors were quantified and evaluated along the main-stem of the Mill Creek and related to the macroinvertebrates five times over the summer of 2000. The habitat was characterized using the Ohio EPA's QHEI, the estimated peak flow, and pebble counts. Water quality was quantified by the nutrient concentrations found. Both habitat and water parameters were compared to macroinvertebrate density, taxa richness, and the calculated metric, invertebrate community index. Data was collected for base flow in the summer and autumn of 2000-2001. The QHEI and the ICI were linearly related over transects done in four non-consecutive years within a decade. Multiple regression showed several habitat variables correlated to taxa richness. ANOVA identified average species richness was significantly impacted by both water quality and habitat variables. A non-parametric method (detrended canonical correspondence analysis) separated the determinants for invertebrate communities along a nutrient (19.1% of variance) and habitat axis (11.1% of variance).
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Category : Eutrophication
Languages : en
Pages : 258
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Author:
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Category : Benthic animals
Languages : en
Pages : 90
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Author: John Douglas Stark
Publisher:
ISBN:
Category : Freshwater invertebrates
Languages : en
Pages : 62
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Category : Ecology
Languages : en
Pages : 182
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Author: Mark D. Munn
Publisher: United States Department of the Interior
ISBN: 9781411341838
Category : Biotic communities
Languages : en
Pages : 92
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"National Water-Quality Assessment Project."
Author: Kathryn Jordan McCrary
Publisher:
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Category :
Languages : en
Pages :
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Over the last few decades, increased urbanization has led to a new recognition in stream health - the urban stream or the urban stream syndrome. Understanding urban water quality is important for identifying those factors or sources that contribute to impairment. Many streams are listed as impaired because of the increased concentrations of pathogens. While wastewater treatment plants (WWTPs) discharge effluent that has been disinfected, often downstream from WWTPs point sources are high numbers of indicator bacteria, Escherichia coli. This study collected data on the recovery and regrowth of E. coli by collecting ultraviolet light treated effluent from the Carters Creek WWTP and spiked it with three different concentrations of DOC derived from a leaf and grass extract. Escherichia coli were enumerated at 6, 12, 18, 24, 36, 48, and 72 hours. After 6 h growth for each of the grass treatments, except for the control and high grass treatment exceeded the primary contact recreation standard for surface water quality. At 18h the low and high leaf treatments exceeded the primary contact recreation standard for surface water quality. The chemistry of each flask was analyzed for DOC, total N, NO3N, NH4N, Na+, K+, Mg+2, Ca+2, F−, Cl−, SO4−2 and PO4−3 at t=0 and t=72 h. CNP values for both leaf and grass treatments ranged from 2.22 - 36.5. Regrowth was not observed in those treatments with a CNP value below 5. Biodegradability of the treatments was examined to identify the limiting nutrient. By focusing on reducing the CNP value below 5 of the receiving water, recovery and regrowth of E. coli downstream from WWTPs can be reduced. The biodegradability test suggested that in the presence of excess DOC, N is the limiting nutrient. Certain macroinvertebrate species, Ephermeroptera, Trichoptera, and Plecoptera (EPT), are indicators of good stream health. Macroinvertebrates were collected at nine watersheds within the Bryan/College Station area, a rapidly urbanizing community, upstream and downstream from WWTPs and analyzed for relative abundance of pollution intolerant (% EPT) and pollution tolerant species. All sites downstream from a WWTP had percent EPT present in the collection.
Author:
Publisher:
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Category : Science
Languages : en
Pages : 176
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Author: Thomas Heatherly
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Illinois streams are subject to numerous stressors that can negatively impact their biological integrity. This study was to determine the effects of measured physicochemical properties on benthic macroinvertebrate assemblages in Illinois streams, evaluate multimetric and multivariate bioassessment approaches, and make recommendations to water resource managers. Benthic macroinvertebrate and physicochemical data were collected from 55 streams in March 2005. Macroinvertebrates were collecting according to rapid bioassessment protocols. Physicochemical data were collected by grab sample, survey, and from historical records. I identified a gradient that showed streams with high quality habitat usually had relatively low nutrient concentrations. Streams that were placed into groups using a cluster analysis aligned well along this gradient in an ordination. The macroinvertebrate communities reflected nonpoint sources of impact, which were identifiable using a combination of multimetric and multivariate methods.
