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At different times of the year and at different sampling sites several <br />• groups contributed a significant amount to the total biomass (i.e. more than <br />2 g/ 2.)Table 5-L1 & -12 indicate the contribution of the several groups for <br />Mazch and July. <br />During March, averaging over all stations combined, the caddisflies t~.0 q), <br />t_ruef lies (3.9 g), snails (2.2 g), and stoneflies (1.0 g) provided the bulk of the <br />biomassf~ a grand average of approximately 16 g~m2. During July, similar averages <br />showed the bulk of the biomass to come fm m mayflies (1.2 g), snails (0.6 g}, and <br />trueflles (0.5 g) for a grand average of approximately 2.6 g~m2. Thus the March <br />sample averaged about 6 times greater in weight compared to the July average. <br />Overall biomass differences between stations were not marked in March except <br />for the very high weight obtained for station NF-2. As mentioned, this xas <br />Primarily due to large numbers of caddisflies. Other station differences were due <br />• do particular groups of organisms. Mayflies and stoneflies contributed relatively <br /> urge weights at upstream stations NF-1 & 2 compared to the lower stations. <br />Dipterans were high in the lower stations compared to the upper stations. <br />In July, the upper stations as a whole had larger weights compared to the <br />lower stations, Nz'-1 (3.5 B). NF-2 (4.4 g), A1F-3 (2.0), h'F'J+ (0.35 g). BY <br />groups,mayf lies, caddisflies,and snails produced greater weights in the upstream <br />stations; and station 4, below Stevens Gulch Creek, was especially lox in biomass <br />for all taxa. <br />5.2.3 Uniqueness <br />The benthlc fauna contained no unusual or rare species and is not con- <br />sidered unique from the standpoint of unusual communities nor especially high <br />productivity. <br />• <br />5-8 <br />