. The Canadian field-naturalist. CYANOPHYTA. 11 10 Figure 1. (1) Spirogyia subsalsa; (2-5) Micrasterias; (6) Pleurotaenium; (7) Cosniariuin; (8) Closteriuiu\ (9-10) Anabeiia circinalis; (11) Gomphosphaeria lacustris. Periphyton of Pink Lake This study established a baseline for Pink Lake of 16 species of Cyanophyta (blue-green algae), 24 Chlorophyta (green algae), 86 Chrsyophyta (largely diatom species), and 8 species from the other algal divisions. Peri- phyton analysis indicated that of the five lakes studied in Gatineau Park, Pink Lake was unique in having indicator species of alkaline hard
. The Canadian field-naturalist. CYANOPHYTA. 11 10 Figure 1. (1) Spirogyia subsalsa; (2-5) Micrasterias; (6) Pleurotaenium; (7) Cosniariuin; (8) Closteriuiu\ (9-10) Anabeiia circinalis; (11) Gomphosphaeria lacustris. Periphyton of Pink Lake This study established a baseline for Pink Lake of 16 species of Cyanophyta (blue-green algae), 24 Chlorophyta (green algae), 86 Chrsyophyta (largely diatom species), and 8 species from the other algal divisions. Peri- phyton analysis indicated that of the five lakes studied in Gatineau Park, Pink Lake was unique in having indicator species of alkaline hard waters. For example, Navicula exigua (Figure 3), a diatom indicator of moderate hardness (Patrick and Reimer 1966), was found only in Pink Lake. Eunotia arcus (Fig- ure 3), one of the few members of the genus which grows in association with high concen- trations of calcium carbonate (Patrick and Reimer 1966), was restricted to Pink Lake as well. Another diatom, Amphipleura pellu- cida, which was unique to Pink Lake, is generally restricted to fairly hard waters (Patrick and Reimer 1966). Periphyton density in Pink Lake was low. Long strands of filamentous green algae or mats of blue-green algae in the littoral zone were never observed in the two years that we have been studying the lake. Spirogyra subsalsa (Figure 1) was present in low densities while Bulbochaeta and Oedogonium were only slight- ly more abundant. Pink Lake has proved to be unique in a number of ways all of which ultimately are related to its meromictic status as the only lake in the Gatineau Park with a permanent, deep, non-mixing bottom layer (Dickman and Peters, unpublished).. 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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