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The taxonomy and autecology of Colpomenia peregrina (Sauv.) Hamel (Phaeophyceae) Vandermeulen, Herbert


Collection and quantitative observation of Colpomenia peregrina (Sauvageau) Hamel (Phaeophyta) and its associated algal community was made over a three year period at two marine sites, Bath Island and Bamfield (British Columbia). Percent cover values were compared to measurements of salinity, water temperature, irradiance, daylength and tidal cycles via several ordination methods. Colpomenia occurred in low density when environmental parameters were at the high or low end of their normal range. Experiments indicated that wood is a better substratum than Plexiglas for C. peregrina growth in the field, Plants produce zoospore dispersal shadows of approximately 4 m in diameter. Manipulations of overstory plant density in the field did not affect the percent cover of C. peregrina at the same spot. No consistent relationships could be found between C. peregrina percent cover and the cover of other members of the algal community. The effects of daylength, temperature, nutrients and salinity on the microscopic stages of the plant were studied in culture. The laboratory work confirmed field observations. Low salinity and low temperature inhibited the formation of uprights. Daylength and irradiance were of secondary importance. The morphology of fresh adult plants was compared to that of herbarium specimens using methacrylate-embedded thin sections. Colpomenia peregrina and C. bullosa (Saunders! Yamada are the only species of Colpomenia found at the study sites. Type specimens were designated for C. sinuosa (F.C. Mertens ex Roth) Derbes et Solier, C. bullosa (Saunders). Yamada and C. peregrina (Sauvageau) Hamel.

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