In situ patterns of intracellular photosynthate allocation by sea ice algae in the Canadian high arctic |
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Authors: | Ralph E. H. Smith Alex W. Herman |
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Affiliation: | (1) Biology Department, University of Waterloo, N2L 3G1 Waterloo, Ontario, Canada;(2) Metrology Division, Department of Fisheries and Oceans Canada, Bedford Institute of Oceanography, B2Y 4A2 Dartmouth, Nova Scotia, Canada |
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Abstract: | Summary A novel sampling/incubating device was used to determine the in situ patterns of intracellular photosynthate allocation by algae living in the bottom of annual sea ice in the Canadian arctic. During the seasonal decline of the bloom in late May and June, the average allocation pattern after 24 h incubation in the bottom 1 cm of ice (where the bulk of the algae are found) was 30.5% to low molecular weight materials, 10.6% to lipid, 48.8% to polysaccharide and 8.8% to protein. Allocation patterns were vertically stratified and light-dependent within the bottom ice community, with higher allocation to lipid in the upper, better-illuminated, strata. Chlorophyll-specific photosynthesis rates were extremely low (<0.031 gC·g Chl a–1·h–1). Short incubations (ca. 1h) gave similar results to the 24 h incubations. The in situ allocation patterns were atypical of those normally expected for light-limited microalgae, but were consistent with a physiological response to inorganic nutrient limitation in the late stages of the bloom. |
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