. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 36 Critical Trends in Illinois Ecosystems Table 14. Basins with Notably Better or Worse Indicator Values Relative to the Average. Most streams that drain prairie landforms have been straightened, their canopies removed, and their watersheds tiled to drain fields more rapidly. HBI MBI EPT EPT Taxa Taxa Native Darter Exotic Habitat Richness TaxafRW) Richness Dominance Fish Richness Species Score Rock - + - - Fox/Des
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 36 Critical Trends in Illinois Ecosystems Table 14. Basins with Notably Better or Worse Indicator Values Relative to the Average. Most streams that drain prairie landforms have been straightened, their canopies removed, and their watersheds tiled to drain fields more rapidly. HBI MBI EPT EPT Taxa Taxa Native Darter Exotic Habitat Richness TaxafRW) Richness Dominance Fish Richness Species Score Rock - + - - Fox/Des Plaincs - " - + KaakakeeA'ermilion/ Mackinaw + - + + + - - Spoon + + + + + + - + Sangamon + + - + + + LaMoine - - - + + Kaskaskia - - - - - - - - - EmbarrasAfermilion - - + + + + + + Little Wabash + - - - - + + + + Big Muddy/SaUne/ Cache - + + + + + - Note: Blank cells indicate values near the average,'+' indicates greater than 1/2 standard deviation above the average, '-'indicates more than 1/2 standard deviation below the average. CORRELATING AQUATIC INDICATORS CTAP uses several aquatic indicators to monitor stream quality. The most valuable indica- tors are those that contribute unique information about stream quality and are also correlated with other indicators. The table below shows where relationships between indicators are strongest. For example, EPT richness is significantly corre- lated, in a negative fashion, with the HBI; RiverWatch EPT taxa richness is similarly corre- lated with the MBI. This fits the hypothesis that when water quality is good, the number of EPT taxa should be higher and the HBI and MBI should be lower since many organisms are present that are less tolerant of pollution. >X^ile the correlations confirmed this rela- tionship, sampling results did not always fit this model. A sampling site may have high EPT richness, indicating species diversity, while the HBI value reflects a large number of pollution tol- erant organisms. ()ne explanation
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