Water-Quality Assessment of Two Slow-Moving Sandy-Bottom Sites on the Saw Mill River, New York

We selected 2 sites on the Saw Mill River and conducted biological assessments of water quality using macroinvertebrate composition. Assessment metrics used were: Shannon-Weiner diversity, evenness, species richness, Hilsenhoff biotic index (HBI), Ephemeroptera—Plecoptera—Trichoptera richness (EPT),...

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Bibliographic Details
Published in:Northeastern naturalist 2015-01, Vol.22 (1), p.NENHC-56-NENHC-69
Main Authors: Warkentine, Barbara E, Rachlin, Joseph W
Format: Article
Language:English
Subjects:
Biodiversity
Creeks & streams
Floods
Hypotheses
Organic chemicals
Rivers
SPECIAL SECTION: PAPERS FROM NENHC 2014
Urbanization
Vegetation
Water quality
Water shortages
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Summary:We selected 2 sites on the Saw Mill River and conducted biological assessments of water quality using macroinvertebrate composition. Assessment metrics used were: Shannon-Weiner diversity, evenness, species richness, Hilsenhoff biotic index (HBI), Ephemeroptera—Plecoptera—Trichoptera richness (EPT), and non-Chironomidae and Oligochaete (NCO) richness. Water temperature, pH, conductivity, total dissolved solids, dissolved oxygen, and water flow and velocity were not significantly different across sites. Shannon-Weiner diversity values were 2.32 (evenness = 0.20) for Chappaqua and 2.68 (evenness = 0.31) for Hawthorne. Species and NCO richness for Chappaqua were 49 and 22, respectively, and for Hawthorne were 44 and 23, respectively. HBI was 7.99 for Chappaqua and 7.69 for Hawthorne. Both sites had equal EPT values of 5. Based on macroinvertebrate assessment indices, we classified water quality at these sites as non-impacted.
ISSN:1092-6194
1938-5307
DOI:10.1656/045.022.0114