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Changes in seasonal energy dynamics of alewife (Alosa pseudoharengus) in Lake Michigan after invasion of dreissenid mussels

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The dreissenid mussel invasion of Lake Michigan during the 1990s has been linked to a concomitant decrease in the abundance of the amphipod Diporeia. We tracked the seasonal energy dynamics of alewife (Alosa pseudoharengus) in Lake Michigan during 2002–2004 and compared our findings with previously published results for years 1979–1981. Adult alewife energy density exhibited a pronounced seasonal cycle during both the pre-invasion and post-invasion periods, with energy density in October or November nearly twice as high as that in early summer. However, on average, adult alewife energy density was 23% lower during the post-invasion period compared with the pre-invasion period. This significant decline in energy density was attributable to decreased importance of Diporeia in adult alewife diet. In contrast, energy density of juvenile alewives did not significantly differ between the pre-invasion and post-invasion periods. To attain a weight of 8 kg by age 4, bioenergetics modeling indicated that a Chinook salmon (Oncorhynchus tshawytscha) in Lake Michigan would have to consume 22.1% more alewives during the post-invasion period compared with the pre-invasion period.

On a relié l'invasion du lac Michigan par les bivalves dreissénidés durant les années 1990 au déclin simultané de l'abondance de l'amphipode Diporeia. Nous avons suivi la dynamique énergétique saisonnière des gaspareaux (Alosa pseudoharengus) au lac Michigan en 2002–2004 et comparé nos résultats à ceux des années 1979–1981 dans la littérature scientifique. La densité énergétique des gaspareaux adultes suit un cycle saisonnier bien marqué, tant dans les périodes qui précèdent que celles suivent l'invasion; la densité énergétique en octobre ou novembre est presque deux fois plus grande qu'en début d'été. Cependant, en moyenne, la densité énergétique moyenne des gaspareaux adultes est de 23 % plus basse durant la période qui suit l'invasion que durant la période qui la précède. Ce déclin significatif de la densité énergétique s'explique par la diminution considérable des Diporeia dans le régime alimentaire des gaspareaux adultes. En revanche, la densité énergétique des jeunes gaspareaux après l'invasion ne diffère pas significativement de celle d'avant l'invasion. Les modèles bioénergétiques indiquent que, pour atteindre une masse de 8 kg à l'âge de 4 ans, les saumons quinnat (Oncorhynchus tshawytscha) du lac Michigan doivent consommer 22,1 % plus de gaspareaux durant la période qui suit l'invasion que durant la période qui la précède.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: April 1, 2006

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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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