Water quality of selected effluent-dependent stream reaches in southern Arizona as indicated by concentrations of periphytic chlorophyll a and aquatic-invertebrate communities

Water-Resources Investigations Report 98-4199
National Water-Quality Assessment Program, Central Arizona Basins Study Unit
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Abstract

Concentrations of chlorophyll a and indices computed for aquatic- invertebrate communities in two effluent-dependent stream reaches on the Santa Cruz River and one on the Salt River were compared to those in noneffluent-dependent streams to examine potential differences in water quality. Periphytic chlorophyll a from riffle habitats and aquatic-invertebrate communities from riffle and multiple habitats were used for the comparison. Concentrations of chlorophyll a from effluent-dependent streams were elevated compared with concentrations in noneffluent- dependent streams. Aquatic-invertebrate communities from effluent-dependent streams were characterized by an abundant, yet taxonomically depauperate fauna of tolerant organisms; whereas, noneffluent-dependent streams supported a diverse assemblage of aquatic invertebrates including taxa considered sensitive to water-quality degradation. These results indicate that water quality of the effluent-dependent streams is poor compared with water quality of noneffluent-dependent streams. Patterns of taxonomic composition of aquatic-invertebrate communities and abundances of aquatic invertebrates from effluent- dependent streams are the same as patterns discussed in the scientific literature.

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Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Water quality of selected effluent-dependent stream reaches in southern Arizona as indicated by concentrations of periphytic chlorophyll a and aquatic-invertebrate communities
Series title Water-Resources Investigations Report
Series number 98-4199
DOI 10.3133/wri984199
Year Published 1998
Language English
Publisher U.S. Geological Survey
Publisher location Tucson, AZ
Description ii, 12 p.
Country United States
State Arizona
Other Geospatial Central Arizona Basins
Projection Albers Equal-Area Conic projection
Scale 100000
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