AQUATIC MACROINVERTEBRATES 



Study Area 



Aquatic macroinvertebrate sample sites were located at three stations 

 (Upper, Middle and Lower), which correspond to the same stations at which fish 

 population data were collected. The Upper, Middle and Lower stations corre- 

 spond to the Below Edward Creek, Below Beef straight Creek and Durant Sections, 

 respectively, described in the Fisheries section. 



Methods 



Aquatic macroinvertebrates were collected with a modified Surber sampler 

 which had a one square foot sample surface area. Three square foot samples 

 were collected from each of the three sample sites on May 21, 1984 and 

 August 6, 1984. The sampler was placed in riffle habitats which had cobble 

 substrates (3" to 6") and depths of approximately 6 inches. Invertebrates 

 were collected by scrubbing the larger cobble with a brush and disturbing the 

 finer substrate with a three-pronged garden claw. Samples were concentrated 

 in a series 30 sieve, transferred to labelled containers and preserved in 10% 

 formalin. The samples were returned to the laboratory where macroinverte- 

 brates were separated from the gravel and detritus by order and transferred to 

 labelled vials containing 70% ethanol. 



Macroinvertebrates were identified to the lowest practicable taxon, 

 usually genus or species, and enumerated. Identifications were made by using 

 keys written by Allen and Edmunds (1962 and 1963), Bauman et al (1977), 

 Brinkhurst and Jamieson (1971), Brown (1972), Edmunds et al (1976), Hamilton 



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