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s•,irrounding zlgae a^.d de~is and identi°ying them to the loxest taxa <br />• practical. <br />In initial October samples all organisms in the sample xere counted. <br />In subseeuent samples ail of the larger organisms were counted and the number <br />of smaller organisms were estimated from a 25-50o sub-sample. O'_igochaete <br />worms we=e not counted because of their tendency to break into several <br />nieces and the excessive time that would have been involved. <br />A number of basic keys were used for identifying benthic organisms and <br />specimen identification was ver ified by a second party. References used are <br />listed in the bibliography. <br />In addition to the courts and identification of organisms, wet weight <br />biomass values xere taken from the March and July samples as folloxs: <br />1) the organisms were placed on filter paper for abut 15-30 seconds to remove <br />• excess moisture, 2) they were then placed in a graduated centrifuge tube <br />containing 70~ EtOH,3) displacement was then measured, with 1.0 ml dis- <br />placement assumed to equal 1.0 gram wet weight. This pxrocedure has been <br />used extensively for a number of yezss, and eras originally described, in a <br />modiried form, in Welch's Limnolo~ical Methods (1448). <br />5.2 Res_lts and Discussion <br />Substrate from which samples were taken were ~isarily cobble s(2-14 inch <br />diameter) on the si~-f'ace with fine sand and silt and more cobbl6 belox. <br />During October, 197E there was a great deal of filimentous algae on the <br />cobble, during Afarch there was very little,and d•.LYing July, 1977 a moder- <br />ate amount. There were no strong spring freshets in 1977 to f'_ush out the <br />finer pzrticles,and low tc very lex flows were the rule during most of the yeas <br /> <br />5-2 <br />