. The Canadian field-naturalist. 374 The Canadian Field-Naturalist Vol. 89 CHRYSOPHYTA. Figure 2. (1) Cymbella stuxbergii; (2) Dinobiyon bavaricum; (3) Pinnu- loria nodosa; (4) Fragilaria crotonensis; (5) Diatoma hieinale; (6) Pinnularia nobilis; (7) Pinnularia dactyhis; (8) Synedra tabulata; (9) Achnanthes lanceolata. Periphyton of MeacJi Lake Meach Lake contained the highest diversity of periphyton species with 117 diatom species, 23 Cyanophyta, 26 Chlorophyta, and 12 spe- cies from other classes giving a total of 178 periphyton species (Table 1). This high di- versity is attributed to three

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. The Canadian field-naturalist. 374 The Canadian Field-Naturalist Vol. 89 CHRYSOPHYTA. Figure 2. (1) Cymbella stuxbergii; (2) Dinobiyon bavaricum; (3) Pinnu- loria nodosa; (4) Fragilaria crotonensis; (5) Diatoma hieinale; (6) Pinnularia nobilis; (7) Pinnularia dactyhis; (8) Synedra tabulata; (9) Achnanthes lanceolata. Periphyton of MeacJi Lake Meach Lake contained the highest diversity of periphyton species with 117 diatom species, 23 Cyanophyta, 26 Chlorophyta, and 12 spe- cies from other classes giving a total of 178 periphyton species (Table 1). This high di- versity is attributed to three major factors: (1) Meach Lake receives a continuous sup- ply of algal cells from Lac Mousseau and Lac Philippe because it is at the base of the watershed. (2) Meach Lake, hke Lac Philippe, ap- pears to be in transition between oligotrophy and eutrophy and both types of indicator species are present. For example, Tabellaria jenestrata, Navicula vulpina (Figure 3), and Fragilaria crotonensis (Figure 2) are all in- dicators of mesotrophic to eutrophic conditions (Patrick and Reimer 1966) while Pinnularia diver gens and Diatoma hiemale (Figure 2), two more or less oligotrophic species (Patrick and Reimer 1966), are also found in Meach. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club