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Combining limnology and palaeolimnology to investigate recent regime shifts in a shallow, eutrophic lake

Randsalu Wendrup, Linda LU ; Conley, Daniel LU ; Carstensen, Jacob; Hansson, Lars-Anders LU ; Brönmark, Christer LU ; Fritz, Sherilyn C.; Choudhary, Preetam; Routh, Joyanto and Hammarlund, Dan LU (2014) In Journal of Paleolimnology 51(3). p.437-448
Abstract
In this study, we demonstrate that an integrated approach, combining palaeolimnological records and limnological monitoring data, can increase our understanding of changing ecological patterns and processes in shallow lakes. We focused on recent regime shifts in shallow Lake Krankesjon, southern Sweden, including the collapse of the clear-water state in 1975 and its subsequent recovery in the late 1980s. We used diatom, hydrocarbon and biogenic silica sediment records, in concert with limnological data sets on nutrient concentrations, water clarity, chlorophyll-a and water depth, to investigate the shifts. The shift from clear to turbid conditions was abrupt and occurred over 1 to 2 years, whereas recovery of the clear-water state was more... (More)
In this study, we demonstrate that an integrated approach, combining palaeolimnological records and limnological monitoring data, can increase our understanding of changing ecological patterns and processes in shallow lakes. We focused on recent regime shifts in shallow Lake Krankesjon, southern Sweden, including the collapse of the clear-water state in 1975 and its subsequent recovery in the late 1980s. We used diatom, hydrocarbon and biogenic silica sediment records, in concert with limnological data sets on nutrient concentrations, water clarity, chlorophyll-a and water depth, to investigate the shifts. The shift from clear to turbid conditions was abrupt and occurred over 1 to 2 years, whereas recovery of the clear-water state was more gradual, taking 4-5 years. In 1978, shortly after the first regime shift in water clarity, the diatom community underwent a significant shift. It became less diverse, with decreased abundance of epiphytic and planktonic taxa. Despite rising phosphorus concentrations and lower abundance of submerged macrophytes, Lake Krankesjon has remained in the clear-water state over the past 20 years, although this state seems to be increasingly unstable and susceptible to collapse. The complex reactions of the entire lake ecosystem to major changes in lake-water clarity, as shown by the palaeolimnological variables investigated in this study, emphasize the importance of careful lake and catchment management if a stable, clear-water state is desired. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Regime shift, Monitoring, Ecosystem, Alternative stable state, Diatoms, Hydrocarbons
in
Journal of Paleolimnology
volume
51
issue
3
pages
437 - 448
publisher
Springer
external identifiers
  • wos:000331105500008
  • scopus:84893792880
ISSN
0921-2728
DOI
10.1007/s10933-014-9767-5
project
MERGE
BECC
language
English
LU publication?
yes
id
d23ea7fa-00ca-4070-89d8-23cbde58d53f (old id 4376310)
date added to LUP
2014-04-14 13:25:22
date last changed
2017-11-12 03:38:54
@article{d23ea7fa-00ca-4070-89d8-23cbde58d53f,
  abstract     = {In this study, we demonstrate that an integrated approach, combining palaeolimnological records and limnological monitoring data, can increase our understanding of changing ecological patterns and processes in shallow lakes. We focused on recent regime shifts in shallow Lake Krankesjon, southern Sweden, including the collapse of the clear-water state in 1975 and its subsequent recovery in the late 1980s. We used diatom, hydrocarbon and biogenic silica sediment records, in concert with limnological data sets on nutrient concentrations, water clarity, chlorophyll-a and water depth, to investigate the shifts. The shift from clear to turbid conditions was abrupt and occurred over 1 to 2 years, whereas recovery of the clear-water state was more gradual, taking 4-5 years. In 1978, shortly after the first regime shift in water clarity, the diatom community underwent a significant shift. It became less diverse, with decreased abundance of epiphytic and planktonic taxa. Despite rising phosphorus concentrations and lower abundance of submerged macrophytes, Lake Krankesjon has remained in the clear-water state over the past 20 years, although this state seems to be increasingly unstable and susceptible to collapse. The complex reactions of the entire lake ecosystem to major changes in lake-water clarity, as shown by the palaeolimnological variables investigated in this study, emphasize the importance of careful lake and catchment management if a stable, clear-water state is desired.},
  author       = {Randsalu Wendrup, Linda and Conley, Daniel and Carstensen, Jacob and Hansson, Lars-Anders and Brönmark, Christer and Fritz, Sherilyn C. and Choudhary, Preetam and Routh, Joyanto and Hammarlund, Dan},
  issn         = {0921-2728},
  keyword      = {Regime shift,Monitoring,Ecosystem,Alternative stable state,Diatoms,Hydrocarbons},
  language     = {eng},
  number       = {3},
  pages        = {437--448},
  publisher    = {Springer},
  series       = {Journal of Paleolimnology},
  title        = {Combining limnology and palaeolimnology to investigate recent regime shifts in a shallow, eutrophic lake},
  url          = {http://dx.doi.org/10.1007/s10933-014-9767-5},
  volume       = {51},
  year         = {2014},
}