Effects of two classification strategies on a Benthic Community Index for streams in the Northern Lakes and Forests Ecoregion

Ecological Indicators
By: , and 

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Abstract

Ninety-four sites were used to analyze the effects of two different classification strategies on the Benthic Community Index (BCI). The first, a priori classification, reflected the wetland status of the streams; the second, a posteriori classification, used a bio-environmental analysis to select classification variables. Both classifications were examined by measuring classification strength and testing differences in metric values with respect to group membership. The a priori (wetland) classification strength (83.3%) was greater than the a posteriori (bio-environmental) classification strength (76.8%). Both classifications found one metric that had significant differences between groups. The original index was modified to reflect the wetland classification by re-calibrating the scoring criteria for percent Crustacea and Mollusca. A proposed refinement to the original Benthic Community Index is suggested. This study shows the importance of using hypothesis-driven classifications, as well as exploratory statistical analysis, to evaluate alternative ways to reveal environmental variability in biological assessment tools.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Effects of two classification strategies on a Benthic Community Index for streams in the Northern Lakes and Forests Ecoregion
Series title Ecological Indicators
DOI 10.1016/S1470-160X(03)00043-8
Volume 3
Issue 3
Year Published 2003
Language English
Publisher Elsevier
Contributing office(s) Great Lakes Science Center
Description 8 p.
First page 195
Last page 202
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
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