Alteration and Recovery of a Stream Macroinvertebrate Community Exposed to Fly Ash Effluent and an Analysis of the Causative Factors PDF Download

Author: Winona L. Specht
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Category : Coal ash sites
Languages : en
Pages : 420

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Author:
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Category : Dissertations, Academic
Languages : en
Pages : 740

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Author:
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ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 696

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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 984

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Author: John J. Magnuson
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Category : Aquatic animals
Languages : en
Pages : 172

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Fly ash from the 527-MW Coal-fired Columbia Generating Station Unit I (Columbia Co., Wisconsin) is discharged as a slurry into an adjacent ashpit. Water from the ashpit is pumped to a ditch that joins the ashpit drain and Rocky Run Creek before they reach the Wisconsin River. Habitat alterations have been noted as relatively minor changes in water quality parameters (e.g., alkalinity, hardness, pH, and turbidity), as increased amounts of some dissolved trace elements (Cr, Ba, Al, Cd, and Cu), and as the precipitation of trace elements (Al, Ba, and Cr) into a floc that coats the stream bottoms. The ashpit drain became an unsuitable habitat for aquatic invertebrates after Columbia I began operating. Rocky Run Creek is still a suitable habitat for many aquatic invertebrates, but evidence of sublethal stresses and habitat avoidance exists.

Author: Michelle Bailey Lakly
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Category :
Languages : en
Pages : 272

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Author: Zoe Masters
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Category : Acid pollution of rivers, lakes, etc
Languages : en
Pages : 424

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Author: Sara Eileen Henderson
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Category : Freshwater ecology
Languages : en
Pages : 44

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Flooding is an important disturbance structuring stream communities. Understanding macroinvertebrate post flood dynamics is critical for informing key ecosystem processes such as food web dynamics and organic matter processing in these systems. While flooding has been investigated in a diversity of freshwater ecosystems, there are fewer studies focused on urban streams. The overall objective of this research is to quantify changes in macroinvertebrate populations in urban restored streams following flood events.

Author:
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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).

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

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