178 



WARD, CANTON, AND GRAY 



TROUT 

 CREEK 



COLORADO 



km 



Fig. 1 Map of Trout Creek showing sampling stations and mine 

 spoils. Station TC-7 is about 3 km downstream from TC-6. 



sampling at one or two sites on three occasions. A 929-cm^ Surber 

 sampler with net mesh apertures of ~700 /jm was used to take five or 

 more replicate samples at each site. The organisms in each sample 

 were enumerated separately, and numbers were pooled for diversity 

 index calculations. The Shannon— Weaver index with logarithms to 

 base 2 (bits per individual) was used to calculate macroinvertebrate 

 diversity. Analysis of variance (f-distribution) was calculated on log 

 transformations of raw density data to allow use of parametric tests 

 (Elliott, 1973). 



RESULTS 



A total of 88 macroinvertebrate taxa were identified from the 

 seven sampling stations on Trout Creek. A list of taxa, detailed 

 methods, and site descriptions are given in Canton and Ward (1978). 



