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Climate-related differences in the dominance of submerged macrophytes in shallow lakes

Authors

  • SARIAN KOSTEN,

    1. Department of Aquatic Ecology and Water Quality Management, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
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  • AMY KAMARAINEN,

    1. Center for Limnology, University of Wisconsin, 680 N. Park St, Madison, WI, 53706, USA
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  • ERIK JEPPESEN,

    1. Department of Freshwater Ecology, National Environmental Research Institute, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
    2. Department of Plant Biology, Aarhus University, Ole Worms Allé 135, 8000 Aarhus, Denmark
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  • EGBERT H. VAN NES,

    1. Department of Aquatic Ecology and Water Quality Management, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
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  • EDWIN T. H. M. PEETERS,

    1. Department of Aquatic Ecology and Water Quality Management, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
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  • NÉSTOR MAZZEO,

    1. Facultad de Ciencias, Universidad de la República, Iguá 4225, CP 11400, Montevideo, Uruguay
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  • LAURA SASS,

    1. Illinois Natural History Survey, University of Illinois at Urbana-Champaign, One Natural Resources Way, Springfield, IL 62702, USA
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  • JENNIFER HAUXWELL,

    1. Wisconsin Department of Natural Resources, Science Operations Center, 2801 Progress Road, Madison, WI 53716, USA
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  • NICOLE HANSEL-WELCH,

    1. Shallow Lakes Program, Minnesota Department of Natural Resources, 1601 Minnesota Drive, Brainerd, MN 56401, USA
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  • TORBEN L. LAURIDSEN,

    1. Department of Freshwater Ecology, National Environmental Research Institute, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
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  • MARTIN SØNDERGAARD,

    1. Department of Freshwater Ecology, National Environmental Research Institute, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
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  • ROGER W. BACHMANN,

    1. Department of Fisheries and Aquatic Sciences, University of Florida 7922 NW 71st Street, Gainesville, FL 32653, USA
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  • GISSELL LACEROT,

    1. Department of Aquatic Ecology and Water Quality Management, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
    2. Facultad de Ciencias, Universidad de la República, Iguá 4225, CP 11400, Montevideo, Uruguay
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  • MARTEN SCHEFFER

    1. Department of Aquatic Ecology and Water Quality Management, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands
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Sarian Kosten, tel. +31 317 485 429, fax +31 317 419 000, e-mail: sarian.kosten@wur.nl

Abstract

It has been suggested that shallow lakes in warm climates have a higher probability of being turbid, rather than macrophyte dominated, compared with lakes in cooler climates, but little field evidence exists to evaluate this hypothesis. We analyzed data from 782 lake years in different climate zones in North America, South America, and Europe. We tested if systematic differences exist in the relationship between the abundance of submerged macrophytes and environmental factors such as lake depth and nutrient levels. In the pooled dataset the proportion of lakes with substantial submerged macrophyte coverage (> 30% of the lake area) decreased in a sigmoidal way with increasing total phosphorus (TP) concentration, falling most steeply between 0.05 and 0.2 mg L−1. Substantial submerged macrophyte coverage was also rare in lakes with total nitrogen (TN) concentrations above 1–2 mg L−1, except for lakes with very low TP concentrations where macrophytes remain abundant until higher TN concentrations. The deviance reduction of logistic regression models predicting macrophyte coverage from nutrients and water depth was generally low, and notably lowest in tropical and subtropical regions (Brazil, Uruguay, and Florida), suggesting that macrophyte coverage was strongly influenced by other factors. The maximum TP concentration allowing substantial submerged macrophyte coverage was clearly higher in cold regions with more frost days. This is in agreement with other studies which found a large influence of ice cover duration on shallow lakes' ecology through partial fish kills that may improve light conditions for submerged macrophytes by cascading effects on periphyton and phytoplankton. Our findings suggest that, in regions where climatic warming is projected to lead to fewer frost days, macrophyte cover will decrease unless the nutrient levels are lowered.

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