Abstract
Water quality of Menard Creek in the Big Thicket National Preserve of southeast Texas was studied from July 1978 to June, 1979 utilizing physicochemical parameters, bacteriological data, and benthic macroinvertebrates.
Physicochemical conditions generally indicated good water quality. Dissolved oxygen concentrations were always high and all other parameters were within the expected ranges for small streams in this area. Conductivity and chlorides indicated low concentrations of oil field brines at Stations 4 and 5.
Numbers of fecal bacteria were higher than acceptable at all stations during much of the study period. Highest numbers were generally found after heavy rains and surface runoff. Fecal coliform to fecal streptococci ratios indicated human contamination in 53 percent of the 60 samples, while non-human contamination was found in 12 percent of the samples.
125 taxa and 7,462 individuals of benthic macroinvertebrates were collected. Chironomids (44.8%, 38 sp.) and oligochaetes (32.1%, 13 sp.) were the dominant groups. The oligochaete Aulodrilus pigueti and the trichopterans Lype diversa and Brachycentrus numerosus were reported in Texas for the first time. The greatest number of taxa was found at Station 1 (79), while Station 5 had the fewest (61). Station 1 had the highest annual species diversity ({xxd}) of 4.37. The other stations had intermediate to high values indicating moderately stressed conditions during high discharge. Sørenson's (1948) index of similarity showed relatively high coefficients of faunal similarity between stations, depending on discharge.
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This research was financed by contract number PX 7029-8-0789 from the National park Service and Lamar University research funds
This research was financed by contract number PX 7029-8-0789 from the National park Service and Lamar University research funds
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Bass, D., Harrel, R.C. Water quality of a southeast Texas stream. Hydrobiologia 76, 69–79 (1981). https://doi.org/10.1007/BF00014036
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DOI: https://doi.org/10.1007/BF00014036