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Paleolimnological records of regime shifts in lakes in response to climate change and anthropogenic activities

Randsalu-Wendrup, Linda LU ; Conley, Daniel J. LU ; Carstensen, Jacob and Fritz, Sherilyn C. (2016) In Journal of Paleolimnology 56(1). p.1-14
Abstract

Regime shifts in lake ecosystems can occur in response to both abrupt and continuous climate change, and the imprints they leave in paleolimnological records allow us to investigate and better understand patterns and processes governing ecological changes on geological time scales. This synthesis investigates paleolimnological records that display apparent regime shifts and characterizes the shifts as either smooth, threshold-like or bistable. The main drivers behind the shifts are also explored: direct climate influence on lakes, climate influence mediated through the catchment, lake ontogenetic processes and/or anthropogenic forcing. This framework helps to elucidate the relationship between driver and regime shift dynamics and the... (More)

Regime shifts in lake ecosystems can occur in response to both abrupt and continuous climate change, and the imprints they leave in paleolimnological records allow us to investigate and better understand patterns and processes governing ecological changes on geological time scales. This synthesis investigates paleolimnological records that display apparent regime shifts and characterizes the shifts as either smooth, threshold-like or bistable. The main drivers behind the shifts are also explored: direct climate influence on lakes, climate influence mediated through the catchment, lake ontogenetic processes and/or anthropogenic forcing. This framework helps to elucidate the relationship between driver and regime shift dynamics and the type of imprint that the associated regime shifts leaves in sediment records. Our analysis of the limited sites available (22 sites) show that smooth regime shifts are characterized with forcing and response variables acting on similar time scales, whereas regime shifts that demonstrate a threshold like response or a hysteresis response occur on shorter time scales than changes in drivers. The temporal resolution of the record, a common concern in paleo records, limits identification of the timing and rate of the regime shifts. When detected, past regime shifts offer rich opportunities to understand ecosystem responses to climate and other changes and to evaluate the mean state and natural variability of lake ecosystems on time scales of decades to millennia. There are a number of remaining challenges in understanding regime shifts and ecosystem dynamics in a paleolimnological perspective including lack of an appropriate temporal resolution and ecosystem feedback mechanisms. Combining paleoecology with contemporary studies can help clarify the scale of regime shifts and to distinguish patterns in ecosystem changes from natural variability.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Alternative stable states, Climate change, Ecosystem dynamics, Regime shift, Threshold
in
Journal of Paleolimnology
volume
56
issue
1
pages
14 pages
publisher
Springer
external identifiers
  • scopus:84973352115
  • wos:000376893600001
ISSN
0921-2728
DOI
10.1007/s10933-016-9884-4
language
English
LU publication?
yes
id
9e97e0fb-d94e-462b-8fbb-17ebacb9a0a6
date added to LUP
2017-01-25 15:15:44
date last changed
2017-11-12 04:28:24
@article{9e97e0fb-d94e-462b-8fbb-17ebacb9a0a6,
  abstract     = {<p>Regime shifts in lake ecosystems can occur in response to both abrupt and continuous climate change, and the imprints they leave in paleolimnological records allow us to investigate and better understand patterns and processes governing ecological changes on geological time scales. This synthesis investigates paleolimnological records that display apparent regime shifts and characterizes the shifts as either smooth, threshold-like or bistable. The main drivers behind the shifts are also explored: direct climate influence on lakes, climate influence mediated through the catchment, lake ontogenetic processes and/or anthropogenic forcing. This framework helps to elucidate the relationship between driver and regime shift dynamics and the type of imprint that the associated regime shifts leaves in sediment records. Our analysis of the limited sites available (22 sites) show that smooth regime shifts are characterized with forcing and response variables acting on similar time scales, whereas regime shifts that demonstrate a threshold like response or a hysteresis response occur on shorter time scales than changes in drivers. The temporal resolution of the record, a common concern in paleo records, limits identification of the timing and rate of the regime shifts. When detected, past regime shifts offer rich opportunities to understand ecosystem responses to climate and other changes and to evaluate the mean state and natural variability of lake ecosystems on time scales of decades to millennia. There are a number of remaining challenges in understanding regime shifts and ecosystem dynamics in a paleolimnological perspective including lack of an appropriate temporal resolution and ecosystem feedback mechanisms. Combining paleoecology with contemporary studies can help clarify the scale of regime shifts and to distinguish patterns in ecosystem changes from natural variability.</p>},
  author       = {Randsalu-Wendrup, Linda and Conley, Daniel J. and Carstensen, Jacob and Fritz, Sherilyn C.},
  issn         = {0921-2728},
  keyword      = {Alternative stable states,Climate change,Ecosystem dynamics,Regime shift,Threshold},
  language     = {eng},
  month        = {06},
  number       = {1},
  pages        = {1--14},
  publisher    = {Springer},
  series       = {Journal of Paleolimnology},
  title        = {Paleolimnological records of regime shifts in lakes in response to climate change and anthropogenic activities},
  url          = {http://dx.doi.org/10.1007/s10933-016-9884-4},
  volume       = {56},
  year         = {2016},
}