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Biomasse et composition spécifique de la microflore des glaces saisonnières: influences de la lumière et de la vitesse de congélation

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Blocks of ice for studying the seasonal sea-ice microflora in the St. Lawrence Estuary, Canada, were collected during two successive winter periods in March 1979 and February 1980. Two distinct peaks of chlorophyll were observed, one in the middle section of the blocks of ice and the other, generally higher peak, in the frazil (the unconsolidated ice found at the bottom of the ice cover). Chlorophyll concentrations in the frazil were 40 to 50 times higher than those in the water column beneath. The internal chlorophyll content of the cells increased from the surface of the ice down to the frazil layer. The taxonomic composition of the algal community was different for the two years. In 1979, benthic diatoms constituted as much as 50% of the ice community, while in 1980 the ice microflora was entirely dominated by pelagic taxa, particularly microflagellates. Our results suggest that the active growth of ice algae occurs mainly in the frazil layer, and that light plays a major role by controlling both the specific composition of the ice community and the concentration of chlorophyll also determine the cell density inside the blocks of ice. Strong interannual differences in taxonomic composition were also observed.

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Communicated by R. W. Doyle, Halifax

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Demers, S., Therriault, J.-. & Descolas-Gros, C. Biomasse et composition spécifique de la microflore des glaces saisonnières: influences de la lumière et de la vitesse de congélation. Mar. Biol. 78, 185–191 (1984). https://doi.org/10.1007/BF00394699

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