2 9 '82 



samples were preserved in formalin and supplied to me by Mr. Al Wipperman. 



Methods 



A portion of the raw sample was used to prepare a wet mount which was examined 

 under 400 X. The wet mount was scanned until most of the algal genera were identi- 

 fied and their approximate rank by volume was estimated. Members of the microfauna 

 were also indentified when possible. 



About half the raw sample was acidified and oxidized over heat to remove the 

 organic matter. The remaining material, consisting mostly of empty diatom frustules 

 along with particles of silt and clay, was washed and a portion taken to prepare a 

 permanent diatom mount. 



Each diatom slide was then examined. First it was scanned and a flora for 

 that slide was prepared. Then, beginning at the edge of the coverslip, successive 

 fields were observed until between 300 and 400 diatom cells were identified and 

 tabulated. Abundance or the percentage contribution of each taxon was then com- 

 puted. Taxa observed during the scanning but not later were tabulated with a 

 "t" (trace). 



Results 



Each raw sample consisted of between 85 and 90 percent unidentifiable and 

 mostly organic detritus. In addition, insect appendages were common in all three 

 samples. Identifiable members of the microfauna included a "little water bear" 

 (Tardigrada), a tiny chironomid larva, and a Vorticella , all at sation 001. 



The remaining 10 to 15 percent of each raw sample consisted of algae, com- 

 prising four divisions and 28 genera (see Table I). In all cases, the most abun- 

 dant alga by volume was Cladophora , a common sessile, branched, filamentous green 

 alga. All specimens of Cladophora were in a degenerate condition, however. As 



