HABITAT ASSOCIATIONS AND EFFECTS OF URBANIZATION ON MACROINVERTEBRATES OF A SMALL, HIGH-PLAINS STREAM

We described the relations between abundance of macroinvertebrates and several habitat variables in Crow Creek within F.E. Warren Air Force Base, Laramie County, Wyoming. Water velocity and longitudinal locatio n showed the highest numbers of significant correlations with abundanc e of macroinvertebrate taxa. Changes in the macroinvertebrate communit y with changes in longitudinal location appeared to result from increa sing urbanization with downstream movement. Caenis lattipennis, Cerato pogonidae, and Dubiraphia sp. were rare in the downstream portion of t he study reach that has received substantial human disturbance.