Influence of dinoflagellate diurnal vertical migrations on dimethylsulfoniopropionate and dimethylsulfide distribution and dynamics (St. Lawrence Estuary, Canada)

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The influence of the diurnal vertical migration of the dinoflagellates Alexandrium tamarense and Scrippsiella trochoidea on dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) dynamics was studied during a 34-h Lagrangian experiment in the St. Lawrence Estuary in July 2000. Particulate DMSP (DMSPp), dissolved DMSP (DMSPd), and DMS exhibited diel patterns with minimum concentrations during the night and maximum concentrations around noon. DMSPp concentrations were correlated with the abundance of the two vertically migrating DMSP-rich dinoflagellates. The DMSPp:Chl a ratio exhibited similar diel variations, suggesting a light-induced de novo DMSP synthesis during the day. Diel variations of the DMS:Chl a ratio suggest that the accumulation of DMS around noon resulted from physiological responses of the algae and (or) bacteria to light. Biological gross DMS production and bacterial DMS consumption were decoupled, leading to rapid fluctuations in DMS. These results show that in systems dominated by DMSP-rich dinoflagellates containing DMSP lyases, DMS concentrations may vary by as much as a factor of 10 over a 24-h period. Such diel variations must be considered when estimating the contribution of such systems to the DMS sea to air flux.

Nous avons étudié l'influence de la migration verticale journalière des dinoflagellés Alexandrium tomarense et Scrippsiella trochoidea sur la dynamique du déméthylsulfoniopropionate (DMSP) et du sulfure de diméthyle (DMS) dans une expérience de type lagrangien de 34 h dans l'estuaire du Saint-Laurent en juillet 2000. Le DMSP particulaire (DMSPp), le DMSP dissous (DMSPd) et le DMS suivent tous des patterns journaliers avec des concentrations minimales durant la nuit et des concentrations maximales vers midi. Les concentrations de DMSPp sont en corrélation avec l'abondance des deux dinoflagellés à migration verticale qui sont riches en DMSP. Le rapport DMSPp:Chl a suit des variations journalières semblables, ce qui indique une néosynthèse de DMSP induite par la lumière durant le jour. Les variations journalières du rapport DMS:Chl a indiquent que l'accumulation de DMS vers midi résulte de réactions physiologiques des algues et (ou) des bactéries à la lumière. La production biologique brute de DMS et la consommation bactérienne de DMS sont déphasées, ce qui entraîne des fluctuations rapides de DMS. Ces résultats démontrent que dans les systèmes dominés par des dinoflagellés riches en DMSP et contenant des DMSP lyases, les concentrations de DMS peuvent varier par un facteur allant jusqu'à 10 au cours d'une période 24 h. On doit tenir compte de ces variations journalières lorsqu'on estime la contribution de tels systèmes au flux de DMS de la mer à l'atmosphère.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2004

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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