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Multimetric Fish Indices for Midcontinent (USA) Great Rivers
Author(s) -
Pearson Mark S.,
Angradi Ted R.,
Bolgrien David W.,
Jicha Terri M.,
Taylor Debra L.,
Moffett Mary F.,
Hill Brian H.
Publication year - 2011
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1080/00028487.2011.639269
Subject(s) - electrofishing , environmental science , index of biological integrity , minnow , fish <actinopterygii> , hydrology (agriculture) , range (aeronautics) , quantile , pluvial , fishery , ecology , statistics , geology , biology , oceanography , mathematics , materials science , geotechnical engineering , composite material
We developed fish assemblage–based multimetric indices as indicators of ecological conditions for the lower Missouri, impounded upper Mississippi, unimpounded upper Mississippi, and Ohio rivers. Using data from 475 daytime electrofishing samples, we calculated 81 candidate fish metrics. We screened these metrics for their range and their responsiveness to a multimetric stressor gradient that included water chemistry, human disturbance, and landscape‐scale indicators of human disturbance and stress. Each reach‐specific great‐river fish index (GRFIn) included 8–10 nonredundant metrics scored on a continuous scale from 0 to 10 (10 = good). No metrics were common to all four GRFIns; one metric (the number of minnow species) was common to three GRFIns. We determined the least disturbed conditions from the y ‐intercepts of the quantile regressions between the GRFIn scores and the corresponding stressor gradients. Ecological condition as indicated by GRFIn score varied among reaches; 44 ± 8% (95% confidence interval around the mean) of the lower Missouri River (by length), 51 ± 20% of the unimpounded upper Mississippi River, 43 ± 8% of the impounded upper Mississippi River, and 39 ± 7% of the Ohio River was most disturbed.