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Littoral zones as sources of biodegradable dissolved organic carbon in lakes

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Abstract:

A survey of 12 lakes in Minnesota, USA, was conducted to examine the factors controlling variability in biodegradable dissolved organic carbon (BDOC) concentration. The principal question addressed was whether BDOC concentration was more strongly related to lake trophic status or morphometric parameters. BDOC concentration was determined by incubating filtered lake water for a period of 15months and fitting an exponential decay curve to measured DOC concentrations. BDOC concentrations varied from 73 to 427mol C·L–1 and composed 15%–63% of the total DOC pool. There were no significant correlations between BDOC and measures of lake trophic status. Instead, BDOC was most closely associated with the percentage of lake area covered by littoral zone, suggesting a significant source of BDOC from aquatic macrophytes and lake surface sediments.

Un inventaire de 12 lacs du Minnesota, É.-U., nous a servi à examiner les facteurs qui contrôlent la variabilité des concentrations de carbone organique dissous biodégradable (BDOC). La question centrale était de savoir si les concentrations de BDOC étaient plus fortement reliées au statut trophique du lac ou à ses variables morphométriques. Les concentrations de BDOC ont été mesurées par l’incubation pendant 15 mois d’eau de lac filtrée et par l’ajustement d’une courbe exponentielle de dégradation à des concentrations mesurées de DOC. Les concentrations de BDOC varient de 73 à 427 mol C·L–1 et représentent 15%–63% du pool total de DOC. Il n’existe pas de corrélations significatives entre le BDOC et les mesures de statut trophique des lacs. En revanche, le BDOC est le plus fortement relié au pourcentage de la surface du lac couverte par la zone littorale, ce qui laisse croire que les macrophytes aquatiques et les sédiments lacustres superficiels sont des sources importantes de BDOC.

Document Type: Research Article

Publication date: November 1, 2008

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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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