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Article

Principal Determinants of Aquatic Macrophyte Communities in Least-Impacted Small Shallow Lakes in France

1
Aquabio, 10 Rue Hector Guimard, 63800 Cournon-d’Auvergne, France
2
University of Rennes, CNRS, ECOBIO-UMR 6553, 35042 Rennes, France
*
Author to whom correspondence should be addressed.
Water 2021, 13(5), 609; https://doi.org/10.3390/w13050609
Received: 22 December 2020 / Revised: 17 February 2021 / Accepted: 20 February 2021 / Published: 26 February 2021
(This article belongs to the Section Water Quality and Contamination)
Small shallow lakes (SSL) support exceptionally high and original biodiversity, providing numerous ecosystem services. Their small size makes them especially sensitive to anthropic activities, which cause a shift to dysfunctional turbid states and induce loss of services and biodiversity. In this study we investigated the relationships between environmental factors and macrophyte communities. Macrophytes play a crucial role in maintaining functional clear states. Better understanding the factors determining the composition and richness of aquatic plant communities in least-impacted conditions may be useful to protect these shallow lakes. We inventoried macrophyte communities and collected chemical, climatic, and morphological data from 89 least-impacted SSL widely distributed in France. SSL were sampled across four climatic ecoregions, various geologies, and elevations. Hierarchical cluster analysis showed a clear separation of four macrophyte assemblages strongly associated with mineralization. Determinant factors identified by distance-based redundancy analysis (db-RDA) analysis were, in order of importance, geology, distance from source (DIS, a proxy for connectivity with river hydrosystems), surface area, climate, and hydroperiod (water permanency). Surprisingly, at a country-wide scale, climate and hydroperiod filter macrophyte composition weakly. Geology and DIS are the major determinants of community composition, whereas surface area determines floristic richness. DIS was identified as a determinant in freshwater lentic ecosystems for the first time. View Full-Text
Keywords: depressional wetlands; ponds; alkalinity; geology; distance from source; connectivity; climate; altitude; hydroperiod depressional wetlands; ponds; alkalinity; geology; distance from source; connectivity; climate; altitude; hydroperiod
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MDPI and ACS Style

Labat, F.; Thiébaut, G.; Piscart, C. Principal Determinants of Aquatic Macrophyte Communities in Least-Impacted Small Shallow Lakes in France. Water 2021, 13, 609. https://doi.org/10.3390/w13050609

AMA Style

Labat F, Thiébaut G, Piscart C. Principal Determinants of Aquatic Macrophyte Communities in Least-Impacted Small Shallow Lakes in France. Water. 2021; 13(5):609. https://doi.org/10.3390/w13050609

Chicago/Turabian Style

Labat, Frédéric, Gabrielle Thiébaut, and Christophe Piscart. 2021. "Principal Determinants of Aquatic Macrophyte Communities in Least-Impacted Small Shallow Lakes in France" Water 13, no. 5: 609. https://doi.org/10.3390/w13050609

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