FIELD AND SAMPLE NOTES 



Mizpah Creek UMC-1. The sample from this site contained 

 Myriophyllum and bits of terrestrial plants. A small flat piece 

 of a Nostoc colony was observed in this sample, as well as 

 isolated filaments. The Phorrnidium species here had very narrow 

 filaments and most of the diatom frustules in this sample were 

 empty . 



Mizpah Creek LMC-7. The sample collected here contained 

 bits of aquatic macrophytes . Monostroma occurred here as an 

 expanded sheet one cell thick; cells were mutually compressed and 

 not in groups of four. Most of the diatoms in this sample were 

 alive (contained chloroplasts and protoplasm) . 



NON- DIATOM ALGAE 



Cyanobacteria and chrysophytes, including diatoms and 

 Trihonewa, were the only algae observed in the sample collected 

 at UMC-1 (Table 4) . Trijbone/na prefers cool, fresh waters (Smith 

 1950) . Green algae were not present at the upstream site. 



Only four genera of non-diatom algae were observed at UMC-1. 

 Least -impaired prairie streams contain an average of 13 genera 

 (Bahls 1993). Although they were only common, diatoms accounted 

 for most of the biomass as UMC-1. The relative abundance of 

 cyanobacteria, particularly the nitrogen- fixer Nostoc, the 

 absence of green algae, and the small number of algal genera 

 probably indicate nitrogen deficiency at this site. 



In contrast, green algae and diatoms were abundant at LMC-7 

 (Table 4) . This site supported 9 genera of non-diatom algae, 

 including two reliable indicators of organic loading: Euglena 

 and Stigeoclonium. The most abundant green alga at LMC-7 was 

 Monostroma, which is a good indicator of brackish water (Smith 

 1950) . The appearance of Oedogoniuw, Anabaena, and Nodular ia, 



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