Long-term pattern of alternative stable states in two shallow eutrophic lakes
Article first published online: 30 MAY 2006
Volume 30, Issue 1, pages 159–167, August 1993
How to Cite
BLINDOW, I., ANDERSSON, G., HARGEBY, A. and JOHANSSON, S. (1993), Long-term pattern of alternative stable states in two shallow eutrophic lakes. Freshwater Biology, 30: 159–167. doi: 10.1111/j.1365-2427.1993.tb00796.x
- Issue published online: 30 MAY 2006
- Article first published online: 30 MAY 2006
- (Manuscript accepted 15 February 1993)
- 1Lake Tåkern and Lake Krankesjön, two moderately eutrophic, shallow lakes in southern Sweden, have during the past few decades shifted several times between a clear-water state with abundant submerged vegetation and a turbid state with high phytoplankton densities.
- 2Between 1985 and 1991, Lake Takern was in a clear state, whereas Lake Krankesjon shifted from a turbid to a clear state. During this shift, the area covered by submerged macrophytes expanded, followed by an increase in water transparency, plant-associated macroinvertebrates, and piscivorous fish. Nutrient concentrations, phytoplankton biomass and abundance of planktonic cladocerans decreased.
- 3In both lakes, water level fluctuations were the most common factor causing shifts, affecting submerged macrophytes either through changes in light availability or through catastrophic events such as dry-out or mechanical damage by ice movement.
- 4Our data give further support for the existence of two alternative stable states in shallow lakes maintained by self-stabilizing feedback mechanisms.