NON-DIATOM ALGAE 



The uppermost site at Lehfeldt (PRl-3) was dominated by the 

 filamentous chrysophyte Vaucheria (Table 4) . Vaucheria is a cool 

 season taxon that grows on moist soil or on rocks in flowing 

 water. The presence of this alga indicates a persistent source 

 of water at this site. 



The site at Paulson (PR2-1) was dominated by the filamentous 

 green alga Cladophora , with a lesser amount of the filamentous 

 red alga Audouinella (Table 4) Dominance by Cladophora and the 

 presence of Audouinella indicate cool and relatively fresh water 

 at this site. 



Rhizoclonium replaced Cladophora as the dominant alga at the 

 Buffalo Highway (PR2-3) . These are closely related genera that 

 differ primarily in the degree of branching. Rhizoclonium tends 

 to be found in slower, warmer, saltier and siltier waters than 

 Cladophora . The appearance of Oedogonium and Anabaena at this 

 site also indicate warmer water than upstream. 



Painted Robe Creek near the mouth (PR2-14) supported an 

 algal flora that was similar to the one at the Buffalo Highway. 



DIATOMS 



The diatom association at Lehfeldt (PRl-3) was dominated by 

 Navicula gregaria (Table 5) . This widely distributed diatom is 

 motile, which allows it to live in waters that are subject to 

 siltation. It prefers cool and somewhat brackish waters ranging 

 from 500 to 10,000 mg/L salinity (Lowe 1974) . An abundance of 

 Navicula gregaria and other motile diatoms at this site resulted 

 in a siltation index that indicated moderate impairment and 



8 



