Journal
HYDROBIOLOGIA
Volume 704, Issue 1, Pages 165-177Publisher
SPRINGER
DOI: 10.1007/s10750-012-1389-1
Keywords
Maximum colonisation depth; Water framework directive; Eutrophication; Secchi depth; Nutrients; Humic lakes
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Funding
- Swedish Environmental Protection
- European Union [226273]
- EU project REFRESH (Adaptive strategies to Mitigate the Impacts of Climate Change on European Freshwater Ecosystems) [244121]
- EU project CLEAR (a Villum Kann Rasmussen Centre of Excellence Project)
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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).
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