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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.

Geospatial Extents

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
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