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• W2034995293 abstract "Even though the uptake and assimilation of organic compounds by phytoplankton has been long recognized, very little is still known about its potential ecological role in natural marine communities and whether it varies depending on the light regimes the algae experience. We combined measurements of size-fractionated assimilation of trace additions of (3)H-leucine and (35)S-dimethylsulfoniopropionate (DMSP) with microautoradiography to assess the extent and relevance of osmoheterotrophy in summer phytoplankton assemblages from Arctic and Antarctic waters, and the role of solar radiation on it was further investigated by exposing samples to different radiation spectra. Significant assimilation of both substrates occurred in the size fraction containing most phytoplankton (>5 µm), sunlight exposure generally increasing (35)S-DMSP-sulfur assimilation and decreasing (3)H-leucine assimilation. Microautoradiography revealed that the capacity to take up both organic substrates seemed widespread among different polar algal phyla, particularly in pennate and centric diatoms, and photosynthetic dinoflagellates. Image analysis of the microautoradiograms showed for the first time interspecific variability in the uptakes of (35)S-DMSP and (3)H-leucine by phytoplankton depending on the solar spectrum. Overall, these results suggest that the role of polar phytoplankton in the utilization of labile dissolved organic matter may be significant under certain conditions and further confirm the relevance of solar radiation in regulating heterotrophy in the pelagic ocean." @default.
• W2034995293 created "2016-06-24" @default.
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• W2034995293 date "2012-09-19" @default.
• W2034995293 modified "2023-10-15" @default.
• W2034995293 title "Sunlight Effects on the Osmotrophic Uptake of DMSP-Sulfur and Leucine by Polar Phytoplankton" @default.
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• W2034995293 doi "https://doi.org/10.1371/journal.pone.0045545" @default.
• W2034995293 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3446903" @default.
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