Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions
We used long-term monitoring data to assess causes behind a recent shift front a clear to a turbid water state in Lake Takern, Sweden. The lake has a previous record of shifts between clear-water and turbid states. but the causes behind these shifts are not well known. During the recent shift, which...
Published in: | Archiv für Hydrobiologie |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
E. Schweizerbart Science Publishers
2004
|
Subjects: | |
Online Access: | https://lup.lub.lu.se/record/146533 https://doi.org/10.1127/0003-9136/2004/0161-0433 |
id |
ftulundlup:oai:lup.lub.lu.se:d1a8a29d-d785-48e4-a658-4c14286a7acf |
---|---|
record_format |
openpolar |
spelling |
ftulundlup:oai:lup.lub.lu.se:d1a8a29d-d785-48e4-a658-4c14286a7acf 2023-05-15T17:35:54+02:00 Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions Hargeby, Anders Blindow, I Hansson, Lars-Anders 2004 https://lup.lub.lu.se/record/146533 https://doi.org/10.1127/0003-9136/2004/0161-0433 eng eng E. Schweizerbart Science Publishers https://lup.lub.lu.se/record/146533 http://dx.doi.org/10.1127/0003-9136/2004/0161-0433 wos:000226165800001 scopus:9744252887 Archiv für Hydrobiologie; 161(4), pp 433-454 (2004) ISSN: 0003-9136 Ecology contributiontojournal/article info:eu-repo/semantics/article text 2004 ftulundlup https://doi.org/10.1127/0003-9136/2004/0161-0433 2023-02-01T23:27:22Z We used long-term monitoring data to assess causes behind a recent shift front a clear to a turbid water state in Lake Takern, Sweden. The lake has a previous record of shifts between clear-water and turbid states. but the causes behind these shifts are not well known. During the recent shift, which occurred in 1995-1997, Submerged vegetation Subsequently declined after a 30-year period of clear-water and abundant vegetation. Among the possible explanations we identify several processes unlikely to have contributed to the recent shift from clear to turbid conditions. including long-term changes in external input of phosphorus. fluctuations in water level. and changes in zooplankton grazing pressure. Instead, likely scenarios to have contributed to the macrophyte decline, and thereby to the shift were: (1) a series of mild winters with short ice cover and absence of winter-kills of fish, leading to high biomasses of benthivorous and planktivorous fish before the shift, and thereby increased bioturbation and internal nutrient recycling, (2) unusually cool and windy springs the years before and during, the shift, leading to unfavourable conditions during the establishing phase of submerged macrophytes. Both shorter periods of ice cover and high wind velocity in winter and spring were associated with climate. approximated by the North Atlantic Oscillation (NAO). We argue that none of these processes alone can force the lake front the clear to the turbid state, but that several stress factors in concert are necessary to initiate a shift. Hence, we conclude that climate variability is likely to have contributed to a multi-causal stress. reducing the resilience of the clear-water state and finally triggering the Shift through inter-year dependent changes; in biomass of submerged macrophytes and fish, organism groups known to have key roles in the dynamics of shallow lakes. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Lund University Publications (LUP) Archiv für Hydrobiologie 161 4 433 454 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology |
spellingShingle |
Ecology Hargeby, Anders Blindow, I Hansson, Lars-Anders Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions |
topic_facet |
Ecology |
description |
We used long-term monitoring data to assess causes behind a recent shift front a clear to a turbid water state in Lake Takern, Sweden. The lake has a previous record of shifts between clear-water and turbid states. but the causes behind these shifts are not well known. During the recent shift, which occurred in 1995-1997, Submerged vegetation Subsequently declined after a 30-year period of clear-water and abundant vegetation. Among the possible explanations we identify several processes unlikely to have contributed to the recent shift from clear to turbid conditions. including long-term changes in external input of phosphorus. fluctuations in water level. and changes in zooplankton grazing pressure. Instead, likely scenarios to have contributed to the macrophyte decline, and thereby to the shift were: (1) a series of mild winters with short ice cover and absence of winter-kills of fish, leading to high biomasses of benthivorous and planktivorous fish before the shift, and thereby increased bioturbation and internal nutrient recycling, (2) unusually cool and windy springs the years before and during, the shift, leading to unfavourable conditions during the establishing phase of submerged macrophytes. Both shorter periods of ice cover and high wind velocity in winter and spring were associated with climate. approximated by the North Atlantic Oscillation (NAO). We argue that none of these processes alone can force the lake front the clear to the turbid state, but that several stress factors in concert are necessary to initiate a shift. Hence, we conclude that climate variability is likely to have contributed to a multi-causal stress. reducing the resilience of the clear-water state and finally triggering the Shift through inter-year dependent changes; in biomass of submerged macrophytes and fish, organism groups known to have key roles in the dynamics of shallow lakes. |
format |
Article in Journal/Newspaper |
author |
Hargeby, Anders Blindow, I Hansson, Lars-Anders |
author_facet |
Hargeby, Anders Blindow, I Hansson, Lars-Anders |
author_sort |
Hargeby, Anders |
title |
Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions |
title_short |
Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions |
title_full |
Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions |
title_fullStr |
Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions |
title_full_unstemmed |
Shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions |
title_sort |
shifts between clear and turbid states in a shallow lake: multi-causal stress from climate, nutrients and biotic interactions |
publisher |
E. Schweizerbart Science Publishers |
publishDate |
2004 |
url |
https://lup.lub.lu.se/record/146533 https://doi.org/10.1127/0003-9136/2004/0161-0433 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Archiv für Hydrobiologie; 161(4), pp 433-454 (2004) ISSN: 0003-9136 |
op_relation |
https://lup.lub.lu.se/record/146533 http://dx.doi.org/10.1127/0003-9136/2004/0161-0433 wos:000226165800001 scopus:9744252887 |
op_doi |
https://doi.org/10.1127/0003-9136/2004/0161-0433 |
container_title |
Archiv für Hydrobiologie |
container_volume |
161 |
container_issue |
4 |
container_start_page |
433 |
op_container_end_page |
454 |
_version_ |
1766135207199506432 |