Determination of Benthic-Invertebrate Indices and Water-Quality Trends of Selected Streams in Chester County, Pennsylvania, 1969-80
Moore, CR
| HERO ID | 4543979 |
|---|---|
| In Press | No |
| Year | 1987 |
| Title | Determination of Benthic-Invertebrate Indices and Water-Quality Trends of Selected Streams in Chester County, Pennsylvania, 1969-80 |
| Authors | Moore, CR |
| Abstract | The trends of biological and chemical data collected for 12 years (1969-80) from 46 sites in Chester County were evaluated by using the seasonal Kendall test. Calculated Brillouin 's diversity indices were plotted against time for each site. Seven sites had upward trends significant at the 99% confidence level, 9 sites had upward trends significant at the 95 to 98% confidence level, 11 sites had upward trends significant at the 90 to 94% confidence level. Of the remaining 19 sites, 17 had upward and 2 had downward trends, but these trends were not statistically significant. The seasonal Kendall test was used to test the chemical data for temporal trends at eight sites having stream discharge data. Significant trends were found at one or more sites for specific conductance, pH, total nitrate, total phosphorus, dissolved chloride, and dissolved sulfate. The chemical data for 11 sites, which were not flow adjusted were tested for trends by plotting against time and determining a correlation coefficient. Significant trends were found in nitrate and chloride. Selected chemical constituents were tested by regression analysis for correlation with diversity index. Only total dissolved solids correlated significantly with diversity index. Several suggestions are made to improve the monitoring program. (USGS) |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Bioindicators; Water pollution; Benthic invertebrates; Species diversity; Trend analysis; Water quality; Limnology; Pennsylvania; Urbanization; Biology; Chester County |
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