Ecological Regime Shifts in Lake Kälksjön, Sweden, in Response to Abrupt Climate Change Around the 8.2 ka Cooling Event
(2012) In Ecosystems 15(8). p.1336-1350- Abstract
- A detailed diatom record from Lake Kälksjön, west-central Sweden, reveals two periods of abrupt ecological change correlative with the 8.2 ka cooling event. Using a combination of abrupt step changes and piece-wise linear regressions, the diatom data were analysed for change points over time, and two sudden and large events that are described as regime shifts were detected. During the first event at c. 8040 cal. yr BP, a doubling in diatom biomass took place over 5-10 years time. This increase in primary productivity can be connected to an erosion event in the catchment that resulted in an abrupt increase in nutrient supply to the lake. The second event was characterised by a substantial shift within the planktonic diatom community from... (More)
- A detailed diatom record from Lake Kälksjön, west-central Sweden, reveals two periods of abrupt ecological change correlative with the 8.2 ka cooling event. Using a combination of abrupt step changes and piece-wise linear regressions, the diatom data were analysed for change points over time, and two sudden and large events that are described as regime shifts were detected. During the first event at c. 8040 cal. yr BP, a doubling in diatom biomass took place over 5-10 years time. This increase in primary productivity can be connected to an erosion event in the catchment that resulted in an abrupt increase in nutrient supply to the lake. The second event was characterised by a substantial shift within the planktonic diatom community from taxa indicative of colder conditions to those indicating warm over 5-10 years at c. 7850 cal. yr BP. This event was superimposed on a successive change from periphytic to planktonic diatom dominance over a 250-year period and a gradual diversification of the periphytic community that spanned c. 150 years. Rapid climate warming following the 8.2 ka event likely caused these changes and both regime shifts are examples of externally driven abrupt ecological change.
This study demonstrates that it is possible to detect, quantify and test for regime shifts in paleoecological data, and it highlights the need for high sampling resolution and precise chronological control. High-resolution paleoecological reconstructions of ecological regime shifts in response to climate change can provide useful analogues of future changes in ecosystem structure and functioning. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3233076
- author
- Randsalu Wendrup, Linda LU ; Conley, Daniel LU ; Carstensen, Jacob ; Snowball, Ian LU ; Jessen, Catherine and Fritz, Sherily
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- thresholds, regime shifts, lake sediment, varves, diatoms, Sweden, climate, Paleolimnology, 8.2 ka event
- in
- Ecosystems
- volume
- 15
- issue
- 8
- pages
- 1336 - 1350
- publisher
- Springer
- external identifiers
-
- wos:000312143300010
- scopus:84870616626
- ISSN
- 1432-9840
- DOI
- 10.1007/s10021-012-9588-1
- language
- English
- LU publication?
- yes
- id
- b24a6043-1fef-4c90-be98-a53c77fc3eb3 (old id 3233076)
- alternative location
- http://link.springer.com/article/10.1007/s10021-012-9588-1
- date added to LUP
- 2016-04-01 14:01:38
- date last changed
- 2022-01-27 22:27:59
@article{b24a6043-1fef-4c90-be98-a53c77fc3eb3,
abstract = {{A detailed diatom record from Lake Kälksjön, west-central Sweden, reveals two periods of abrupt ecological change correlative with the 8.2 ka cooling event. Using a combination of abrupt step changes and piece-wise linear regressions, the diatom data were analysed for change points over time, and two sudden and large events that are described as regime shifts were detected. During the first event at c. 8040 cal. yr BP, a doubling in diatom biomass took place over 5-10 years time. This increase in primary productivity can be connected to an erosion event in the catchment that resulted in an abrupt increase in nutrient supply to the lake. The second event was characterised by a substantial shift within the planktonic diatom community from taxa indicative of colder conditions to those indicating warm over 5-10 years at c. 7850 cal. yr BP. This event was superimposed on a successive change from periphytic to planktonic diatom dominance over a 250-year period and a gradual diversification of the periphytic community that spanned c. 150 years. Rapid climate warming following the 8.2 ka event likely caused these changes and both regime shifts are examples of externally driven abrupt ecological change. <br/><br>
This study demonstrates that it is possible to detect, quantify and test for regime shifts in paleoecological data, and it highlights the need for high sampling resolution and precise chronological control. High-resolution paleoecological reconstructions of ecological regime shifts in response to climate change can provide useful analogues of future changes in ecosystem structure and functioning.}},
author = {{Randsalu Wendrup, Linda and Conley, Daniel and Carstensen, Jacob and Snowball, Ian and Jessen, Catherine and Fritz, Sherily}},
issn = {{1432-9840}},
keywords = {{thresholds; regime shifts; lake sediment; varves; diatoms; Sweden; climate; Paleolimnology; 8.2 ka event}},
language = {{eng}},
number = {{8}},
pages = {{1336--1350}},
publisher = {{Springer}},
series = {{Ecosystems}},
title = {{Ecological Regime Shifts in Lake Kälksjön, Sweden, in Response to Abrupt Climate Change Around the 8.2 ka Cooling Event}},
url = {{https://lup.lub.lu.se/search/files/3727571/3233094.pdf}},
doi = {{10.1007/s10021-012-9588-1}},
volume = {{15}},
year = {{2012}},
}