Over 50 years of fish community monitoring in Illinois’ large rivers: The evolution of methods used by the Illinois Natural History Survey’s Long-term Survey and Assessment of Large-River Fishes in Illinois

摘要: This document describes the methodological evolution of Long-Term Illinois Rivers Fish Population Monitoring Program since its inception. The principal changes include a shift from fixed-site sampling to stratified random at reach scale benefit statistical robustness and concurrent AC electrofishing pulsed-DC increase breadth diversity size classes fishes encountered. These in methodology were implemented during 2016 field season are based on quantitative assessments program data other results recent peer-reviewed publications. refinements will likely improve program’s ability detect describe patterns trends fish assemblages River large rivers Midwest.