Maximum growing depth of submerged macrophytes in European lakes
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Submerged macrophytes are important elements for the structure and functioning of lake ecosystems. In this study, we used chemical and maximum colonisation depth (C_max) data from 12 European countries in order to investigate how suitable C_max may describe the impact by eutrophication. The analyses include data from 757 lakes and 919 lake years covering oligotrophic to eutrophic lakes. Overall, C_max was closely related to Secchi depth (R 2 = 0.58) and less closely to chlorophyll a (R 2 = 0.31), TP (R 2 = 0.31) and total nitrogen, TN (R 2 = 0.24). The low coefficients of determination between C_max and nutrient concentrations suggest that other response factors than nutrient-phytoplankton-light conditions are important for C_max and that it will be difficult to establish strong relationships between external nutrient loading and C_max. Yearly monitoring for 13–16 years in eight Danish lakes showed considerable year-to-year variability in C_max, which for the individual lakes only related weakly to changes in Secchi depth. The use of C_max as an eutrophication indicator is especially relevant in not very shallow lakes (maximum depth >4–5 m), not too turbid lakes (C_max >1 m) and not very humic lakes (colour <60 mg Pt/l).
KeywordsMaximum colonisation depth Water framework directive Eutrophication Secchi depth Nutrients Humic lakes
We wish to acknowledge all data providers, in particular Deirdre Tierney and Caroline Plant (EPA, Ireland), data from the Northern Ireland Environment Agency, data from 96 German water bodies provided by Landesamt für Umwelt, Gesundheit und Verbraucherschutz in Brandenburg (LUGV), and data from Sweden sampled within the State Environmental Monitoring Programme and owned by Chief Inspector at the national monitoring of macrophytes in lakes, funded by the Swedish Environmental Protection. Anne Mette Poulsen and Juana Jacobsen are acknowledged for linguistic and graphical assistance. The paper is a part of the WISER project, funded by the European Union under the 7th Framework Programme, Theme 6 (Environment including Climate Change), contract No. 226273. It has also been supported by the EU project REFRESH (Adaptive strategies to Mitigate the Impacts of Climate Change on European Freshwater Ecosystems, Contract No.: 244121) and CLEAR (a Villum Kann Rasmussen Centre of Excellence Project).
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