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The effect of dreissenid invasions on chlorophyll and the chlorophyll : total phosphorus ratio in north-temperate lakes

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Abstract:

We investigated the effects of dreissenid mussel (Dreissena polymorpha and D. rostriformis bugensis) invasions on the concentrations of chlorophylla (Chl) and total phosphorus(TP), and the Chl:TP ratio within 27 north-temperate lakes that spanned large gradients in lake size and trophic status, using two approaches: (i) regression analysis and (ii) hierarchical modeling. Overall, Chl declined by 40%–45% after dreissenid invasion and the magnitude of effect was structured by epilimnetic volume within stratified, but not nonstratified (mixed) lakes. Declines in TP over the invasion period were significant only for stratified systems and were smaller (~16% reduction from pre-invasion values) than for Chl. Across the complete trophic gradient (i.e., among lakes) the regression approach (analysis of covariance) indicated a significant decline in the intercept of the Chl:TP, but not the slope. In contrast, hierarchical modeling indicated a decline in the slope of Chl:TP among lakes between pre- and post-invasion periods. As with Chl, the effect of dreissenids on Chl:TP declined with increases in epilimnetic volume in stratified, but not nonstratified lakes. Dreissenid effects on Chl were prolonged, with no indication of diminishing within 7–10years of invasion.

Nous étudions les effets des invasions de moules dreissenidées (Dreissena polymorpha et D. rostriformis bugensis) sur la chlorophylle a (Chl), le phosphore total (TP) et la relation Chl:TP dans 27 lacs tempérés nordiques qui couvrent de vastes gradients de tailles et de statuts trophiques lacustres au moyen de deux méthodes, l'analyse de régression et la modélisation hiérarchique. Globalement, la Chl diminue de 40–45% après l'invasion des dreissenidés et l'importance de l'effet est conditionnée par le volume de l'épilimnion dans les lacs stratifiés, mais non dans les lacs non stratifiés (à brassage intégral). Les déclins du TP durant la période d'invasion ne sont significatifs que dans les systèmes stratifiés et sont moins importants (~16% de réduction par rapport aux valeurs d'avant l'invasion) que dans le cas de la Chl. Sur l'ensemble du gradient trophique (c'est-à-dire entre les lacs), la méthode de régression (analyse de covariance) indique une réduction significative de l'ordonnée à l'origine, mais non de la pente, dans la relation Chl:TP. En revanche, la modélisation hiérarchique montre un déclin de la pente de la relation Chl:TP entre les lacs entre les périodes qui précèdent et qui suivent l'invasion. Comme dans le cas de la Chl, l'effet des dreissenidés sur la relation Chl:TP diminue en fonction de l'augmentation du volume de l'épilimnion dans les lacs stratifiés, mais non dans les lacs non stratifiés. Les effets des dreissenidés sur la Chl sont prolongés, sans indication de diminution 7–10 ans après l'invasion.

Document Type: Research Article

Publication date: February 1, 2011

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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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