Step-by-step calculation and spreadsheet tools for predicting stressor levels that extirpate genera and species.

ABSTRACT: In 2011, the United States Environmental Protection Agency (USEPA) released a field-based method for estimating the extirpation of freshwater aquatic benthic invertebrates by ionic mixtures dominated by HCO₃^- , SO₄^2- , and Ca²⁺ measured as specific conductivity (SC). The estimate of extirpation was SC at the 95^th centile (XC95) of a weighted cumulative frequency distribution (CFD) of a genus or species over a range of SC. A CFD of XC95 values was used to predict the SC at which 5% of genera were likely to be extirpated. Because there are many uses for XC95 values and many data sets that could be analyzed using this method, we laid out a step-by-step method for calculating XC95 values and the stressor level that predicts a 5%

SUBMITTER: Cormier SM 

PROVIDER: S-EPMC7241421 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature