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Main Title The evaluation of methods for creating defensible, repeatable, objective and accurate tolerance values for aquatic taxa [electronic resource] /
Author Blocksom, Karen A. ; Winters, L.
Other Authors
Author Title of a Work
Winters, Lori.
CORP Author Environmental Protection Agency, Cincinnati, OH. National Exposure Research Lab. ;Oak Ridge Inst. for Science and Education, TN.;Environmental Protection Agency, Washington, DC. Office of Research and Development.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory,
Year Published 2006
Report Number EPA 600/R-06/045
Stock Number PB2007-102023
Subjects Aquatic invertebrates--Effect of water quality on ; Water quality ; Water--Analysis
Additional Subjects Aquatic biology ; Tolerances(Physiology) ; Bioassessment ; Environmental degradation ; Taxa ; Genus ; Species ; Metrics ; HBI(Hilsenhoff biotic index)
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB2007-102023 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation xiii, 52 p. : digital, PDF file.
In the field of bioassessment, tolerance has traditionally referred to the degree to which organisms can withstand environmental degradation. This concept has been around for many years and its use is widespread. In numerous cases, tolerance values (TVs) have been assigned to individual taxa or groups of taxa to represent their tolerance to pollution. The TVs are then often combined into metrics which describe characteristics of aquatic communities. Perhaps the most familiar example is the Hilsenhoff Biotic Index (HBI) (Hilsenhoff, 1977), an index that has been incorporated into many bioassessment programs. The HBI is typically very useful in distinguishing among sites of higher and lower water quality. To calculate the HBI, each environmental agency or organization typically uses its own set of tolerance values. However, the origins of these values, and rationales for their selection, are often obscure and unverifiable. Available methods for deriving TVs more objectively vary substantially in approach and complexity. Therefore, this study conducted systematic comparisons of existing lists of macroinvertebrate TVs and their resulting HBI scores. It also compared several objective TV derivation approaches, as well as bioassessment metrics derived from each, to determine their repeatability and sensitivity to disturbance. All analyses were run at the family and genus levels.
Title from title screen (viewed Sept. 19, 2007). "May 2006." "EPA 600/R-06/045."