Abstract
Recovery of the submersed vegetation is a target for the management of soft-water shallow lakes if they are to meet water quality and biodiversity standards. Knowledge of patterns of macrophyte space occupation and time to recovery is poor and mostly restricted to free floating species or riparian vegetation. Here we use pre- and post-impact monitoring data over 20 years showing the evolution of submersed aquatic vegetation of lake Baciver (Pyrenees), and develop models to infer space occupation and time to recovery. We use pre-impact macrophyte distribution in relation to bathymetry-derived data to fit logistic models to further simulate lake equilibrium scenarios. Depth and slope were found to be the best predictors, and models suggested that an assemblage dominated by Sparganium angustifolium was, at time of this study, over 95% of its potential distribution area. A dense, newly grown monospecific Isoetes lacustris population occupied <10% of its potential area and model projections suggest that it will take decades to recover. An I. lacustris residual population remains below the estimated depth threshold for survival and is bound to disappear. The lake appears to evolve towards a new steady-state where the current lake hypsography promotes the expansion of algae (Nitella sp.) over angiosperms.
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Acknowledgements
E.G. and E.C. are members of the Environmental Changes Ecology Group (GECA), an Excellence Research Group (SGR-DGR) of the Generalitat de Catalunya (Ref. 2014 SGR 1249. 2014–2017). This study was funded by the Red de Parques Nacionales of the Spanish Ministry of the Environment (PN I+D+I ref. 118/2003 and AQUAREST ref. OAPN 212/2010) and Intramural CSIC (Consejo Superior de Investigaciones Científicas) ref. 0065. The authors are thankful to Lluís Camarero for help processing lake nutrient analysis and to Ana Lumbreras for field and lab assistance during the summer of 2005.
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Riera, J.L., Ballesteros, E., Pulido, C. et al. Recovery of submersed vegetation in a high mountain oligotrophic soft-water lake over two decades after impoundment. Hydrobiologia 794, 139–151 (2017). https://doi.org/10.1007/s10750-017-3087-5
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DOI: https://doi.org/10.1007/s10750-017-3087-5