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Particulate dimethylsulfoniopropionate and dimethylsulfoxide in relation to iron availability and algal community structure in the Peru Upwelling System

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The influence of iron on phytoplankton biogenic sulfur production, physiological status, and community structure in the Peruvian Upwelling System was investigated in September 2000. Vertical profiles of particulate dimethylsulfoniopropionate (DMSPp) and dimethylsulfoxide (DMSOp) were measured at stations along two transects passing from the high-iron waters of the continental shelf, across the Peru trench, to low-iron open-ocean waters. Although chlorophyll a (Chl a) biomass decreased significantly across the shelf, DMSPp and DMSOp concentrations relative to Chl a were higher at the offshore stations (DMSPp:Chl a 2.3–6.4 times greater and DMSOp:Chl a 2.6–4 times greater). These changes were associated with lower iron concentrations, as well as a shift from diatom-dominated communities to ones dominated by cryptophytes and haptophytes (based on algal pigment concentrations). The results of a shipboard iron-addition incubation experiment were similar to patterns observed on the transects. DMSPp:Chl a ratios decreased with increasing iron and diatoms preferentially outgrew other taxa. The possible role of DMSPp and DMSOp as free radical scavengers (stimulated by iron limitation) was supported by the increased concentrations of these compounds measured under low-iron conditions, as well as by the positive correlations (r2 = 0.69 and 0.82, respectively) observed between these compounds and the known antioxidant -carotene.

En septembre 2000, nous avons étudié l'influence du fer sur la production biogénique de soufre, ainsi que l'état physiologique et la composition de la communauté dans le système de la résurgence du Pérou. Nous avons mesuré les profils verticaux du diméthylsulfoniopropionate (DMSPp) et du sulfoxyde de diméthyle (DMSOp) particulaires à des stations le long de deux transects partant des eaux riches en fer du plateau continental, traversant la fosse du Pérou et rejoignant les eaux pauvres en fer de la haute-mer. Bien que la biomasse de chlorophylle décroisse significativement à travers le plateau continental, les concentrations de DMSPp et de DMSOp en fonction de la chlorophylle a sont plus élevées aux stations du large (DMSPp:Chl a 2.3–6,4 fois plus élevé et DMSOp:Chl a 2,6–4 fois plus élevé). Ces changements sont associés à des concentrations réduites de fer, ainsi qu'à un remplacement des communautés dominées par les diatomées par d'autres dominées par les cryptophytes et les haptophytes (d'après les concentrations des pigments des algues). Une expérience d'incubation avec addition de fer faite à bord a donné des résultats similaires aux patterns observés dans les transects. Un accroissement du fer s'accompagne d'un déclin des rapports DMSPp:Chl a et une croissance préférentielles des diatomées par rapport aux autres taxons. Le rôle possible du DMSPp et du DMSOp comme « éboueurs » de radicaux libres (stimulés par la limitation du fer) est appuyé par l'augmentation des concentrations de ces composés dans les conditions de faibles concentrations de fer, ainsi que par les corrélations positives (r2 = 0,69 et 0,82, respectivement) observées entre ces composés et l'antioxydant reconnu, la -carotène. [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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