. Critical trends assessment Program 2003-04 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Critical Trends Assessment Program 2003-2004 Report. Figure 1. Map of Illinois split into the Illinois Department of Natural Resources 5 management regions. The highest abundances are collected when volunteers sampled a combination of either nffle/leaf pack or riffle/snag. The lowest abundances occur when volunteer sample either snag/undercut bank or leaf pack/sediment. Sediment habitat samples have abundances that are only statisti
. Critical trends assessment Program 2003-04 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Critical Trends Assessment Program 2003-2004 Report. Figure 1. Map of Illinois split into the Illinois Department of Natural Resources 5 management regions. The highest abundances are collected when volunteers sampled a combination of either nffle/leaf pack or riffle/snag. The lowest abundances occur when volunteer sample either snag/undercut bank or leaf pack/sediment. Sediment habitat samples have abundances that are only statistically different from undercut bank samples but not the other habitats (see Figure 2c). Sites experiencing a'high percentage of taxa dominance also collect more macroinvertebrates and have increased mean abundances (p < ). The other variables including year the sample is collected, number of times the site is monitored, and time spent monitoring explain less than 1% of the variance combined. Therefore, these variables were dropped from the model and further analysis. Discussion Our results suggest that collecting adequate abundances is mostly related to the population dynamics of different macroinvertebrate taxa rather than to volunteer ability. The strongest predictor for high sample abundance is the presence of facultative/stress tolerant (FST) taxa. 91. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Illinois. Natural History Survey Division; Critical Trends Assessment Project. [Illinois] : Illinois Dept. of Natural Resources, Office of Realty and Environmental Palnning : Office of Scientific Research and Analysis, Natural History Survey Division
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