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New and regenerated primary production in a productive reservoir ecosystem

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The concept of new and regenerated production has been used extensively in marine ecosystems but rarely in freshwaters. We assessed the relative importance of new and regenerated phosphorus (P) in sustaining phytoplankton production in Acton Lake, a eutrophic reservoir located in southwestern Ohio, USA. Sources of nutrients to the euphotic zone, including watershed loading, fluxes from sediments, and excretion by sediment-feeding fish (gizzard shad, Dorosoma cepedianum), were considered sources of new P input that support new primary production and were quantified over the course of a growing season. Regenerated production was estimated by the difference between new and total primary production. New production represented 32%–53% of total primary production, whereas regenerated production represented 47%–68% of total primary production. P excretion by gizzard shad supplied 45%–74% of new P and 24% of P required for total production. In summary, fluxes of P from the watershed and those from sediment-feeding fish need to be considered in strategies to reduce eutrophication in reservoir ecosystems.

Le concept de production nouvelle et régénérée a été souvent utilisé dans les écosystèmes marins, mais rarement en eaux douces. Nous évaluons l’importance relative du phosphore (P) nouveau et régénéré dans le soutien de la production du phytoplancton dans le lac Acton, un réservoir eutrophe du sud-ouest de l’Ohio, É.-U. Les sources de nutriments vers la zone euphotique, en particulier la charge provenant du bassin versant, les flux issus des sédiments et l’excrétion par un poisson qui se nourrit dans les sédiments (l’alose à gésier, Dorosoma cepedianum), sont considérées comme des apports de P nouveau qui alimente une nouvelle production primaire; nous les avons quantifiées tout au cours d’une saison de croissance. La production régénérée est représentée par la différence entre les productions primaires nouvelle et totale. La nouvelle production représente 32–53 % de la production primaire totale, alors que la production régénérée constitue 47–68 % de la production primaire totale. L’excrétion de P par l’alose à gésier fournit 45–74 % du P nouveau et 24 % du P nécessaire à la production totale. En résumé, il est nécessaire de tenir compte des flux de P provenant du bassin hydrographique et de ceux produits par les poissons qui se nourrissent dans les sédiments dans les stratégies pour réduire l’eutrophisation dans les écosystèmes de réservoirs.

Document Type: Research Article

Publication date: 2010-02-01

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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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