Abstract
We compared the macroinvertebrate assemblage of Doe Run Creek, Kentucky, in 1990 with that found by Minckley in 1960. Physico-chemical variables such as discharge, current velocity, temperature, dissolved oxygen, and pH were similar in both studies, although dissolved iron concentration increased and light transmission to the stream's surface decreased. Similarly differences between 1960 and 1990 in total invertebrate density and taxonomic richness did not exceed annual, seasonal, and among-habitat differences. Although individual invertebrate-habitat associations often changed between the two studies, differences were also within the range seen annually or seasonally. This spring-fed stream is thus a fairly stable ecological system, at least in terms of system-level parameters like total abundance and taxonomic richness.
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