EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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5/24/2018  |   10:15 AM - 10:30 AM   |  USING FIELD DATA TO ASSESS THE TOLERANCE OF FRESHWATER FISH TO ELEVATED IONIC CONCENTRATIONS   |  410 B

USING FIELD DATA TO ASSESS THE TOLERANCE OF FRESHWATER FISH TO ELEVATED IONIC CONCENTRATIONS

Recently, anthropogenic sources have increased ion concentrations in freshwaters. We used field data of fish occurrences and specific conductivity to assess the tolerance of freshwater fish to elevated ions. The concentration at which a species was expected to no longer be observed [the extirpation concentration (XC₉₅)] was identified from the 95th percentile of a weighted cumulative frequency distribution for fish species in streams of the central Appalachians. Comparing analyses with fish identified to species or genus, XC₉₅ for most fish genera was biased towards the XC₉₅ of the most tolerant species observed in the genus. Therefore, a genus-level effect threshold was not reliably predictive of species-level effects, unless only one species of a genus occurred in the fish assemblage. The lowest fish species XC₉₅ was 322 μS/cm, and 5% of XC₉₅s were less than 509 μS/cm. Above 509 μS/cm, 41 of 101 fish species declined in occurrence. In comparison, 5% of macroinvertebrate genera XC₉₅s in an analysis of data from the central Appalachians was 300 μS/cm, a value protective of fish. The views expressed are those of the authors and do not necessarily reflect the views or polices of USEPA.

• Salinity
• Assessment
• Ecotoxicology

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Presenters/Authors

Michael Griffith (), U.S. Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement and Modeling, Cincinnati, OH 45268, griffith.michael@epa.gov;

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Lei Zheng (), previously with Tetra Tech, Inc., lei.zheng@hotmail.com;

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Susan Cormier (), USEPA, Cormier, Susan ;

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