Biomass and photosynthesis of size-fractionated phytoplankton in Canadian Shield lakes |
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Authors: | Michel Lafond Bernadette Pinel-Alloul Phillippe Ross |
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Institution: | (1) Département de Sciences biologiques and Centre de recherches écologiques de Montréal, Université de Montréal, C.P. 6128, Succ. A , H3C 3J7 Montréal, Québec, Canada;(2) Present address: IllinoisNatural History Survey, 607 East Peabody drive, 61280 Champaign, IL, USA |
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Abstract: | Both in situ primary production and biomass (chlorophyll ) of fractionated phytoplankton (<64,µ, <25 µm and < 10 µm) were studied in 10 Canadian Shield lakes to elucidate the spatial and temporal variability of the contribution of size fractions to the biomass and primary production of the phytoplankton community. Mean summer biomass and production of each size fraction varied significantly between lakes. Within lakes, temporal variation was low for biomass but great for production. However, temporal variation can be considered of minor importance during the sampling period, as compared to the spatial variation between lakes. Algae from the < 10 µm size fraction were the most important in biomass (41–65 %) and production (23–69%). The temporal trends for both phytoplankton variables thus generally followed closely that of the < 10 µm size fraction. Among the physical, chemical and morphometric variables of the studied lakes, water transparency (Secchi disk), total phosphorus, lake volume, lake area, and mean depth gave the best correlations with phytoplankton variables.Contribution number 354 from the Groupe de recherches en Ecologie des Eaux douces , Limnological Research Group, Université de Montréal. |
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Keywords: | phytoplankton nanoplankton size-fractions biomass primary production Canadian Shield lakes |
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