. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 18, No. 2 Algae of Huntington Canyon, Utah 37 Table 3. Percent occurrence of selected genera of periphyton and nannoplankton at plant site (Site 3). 5/13 1971 6/29 1971 7/30 1971 8/20 1971 10/8 1971 11/15 1971 12/17 1971 2/19 1972 Navicula Periphyton Nanno Cymbella Periphyton Nanno Gomphonema Periphyton Nanno Synedra Periphyton Nanno Nitzschia Periphyton Nanno Achnanthes Periph3rton Nanno Hannaea Periphyton Nanno Diatoma Periphyton Nanno Other Diatoms Periphyton Nanno Nondiatoms Periphyton Nanno 1
. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 18, No. 2 Algae of Huntington Canyon, Utah 37 Table 3. Percent occurrence of selected genera of periphyton and nannoplankton at plant site (Site 3). 5/13 1971 6/29 1971 7/30 1971 8/20 1971 10/8 1971 11/15 1971 12/17 1971 2/19 1972 Navicula Periphyton Nanno Cymbella Periphyton Nanno Gomphonema Periphyton Nanno Synedra Periphyton Nanno Nitzschia Periphyton Nanno Achnanthes Periph3rton Nanno Hannaea Periphyton Nanno Diatoma Periphyton Nanno Other Diatoms Periphyton Nanno Nondiatoms Periphyton Nanno .6 .5 .3 .3 .1 .3 .5 .4 .8 .8 .9 .3 A comparison of the total number of algae colonizing periphyton sampling slides with the total nannoplankton at the plant site for the studv period is illuminating (Fig. 27). General- ly speaking, the nannoplankton were dependent upon the periphyton and the peaks and lows for the two corresponded. However, through the summer, especially in July, the production of periphyton was high due to a heavy colonization of Achnanthes (mostly A. minutissima) and Navicula spp. This summer periphyton increase was followed by an early fall nannoplankton in- crease. Tliis nannoplankton pulse was caused by such genera as Navicula, Cymbella, Gompho- nema, Synedra, Nitzschia, and Achnanthes (Fig. 28). Tliese genera had developed on the creek bottom throughout the spring and early summer and apparently
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