Late-Holocene climate dynamics recorded in the peat bogs of Tierra del Fuego, South America

Simon van Bellen, Dmitri Mauquoy, Paul D. M. Hughes, Thomas P. Roland, Tim J. Daley, Neil J. Loader, F. Alayne Street-Perrott, Emma M. Rice, Verónica A. Pancotto, Richard J. Payne

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Abstract

The ombrotrophic peat bogs of Tierra del Fuego are located within the southern westerly wind belt (SWWB), which dominates climate variability in this region. We have reconstructed late-Holocene water-table depths from three peat bogs and aimed to relate these records to shifts in regional climate. Water-table depths were quantified by the analysis of testate amoeba assemblages, and a regional transfer function was used to infer past water-table depths. During the last 2000 years, testate amoeba assemblages have been relatively stable, with a dominance of Difflugia pulex and Difflugia pristis type, and an increase in Assulina muscorum and other Euglyphida at the top of each section. Multivariate analyses show that water-table depth remained the main environmental variable explaining assemblages along the TiA12 core, but reconstructions were not significant for the two other cores. In line with the low variability in assemblages, water tables were relatively stable during the last 2000 years. Slightly wetter conditions were found between ~1400 and 900 cal. BP and a pronounced recent dry shift was reconstructed in all of the three peat profiles. Considering the regional climatic context, this recent shift may have been forced by a decrease in precipitation and warmer conditions linked to an increase in the importance of the SWWB. Nevertheless, we cannot exclude the influence of higher UV-B radiation resulting from the local degradation of the ozone layer since the late 1970s, which may have had an additional effect on the relative presence of A. muscorum in the southern Patagonian region.
Original languageEnglish
Pages (from-to)489-501
Number of pages13
JournalThe Holocene
Volume26
Issue number3
Early online date8 Oct 2015
DOIs
Publication statusPublished - 1 Mar 2016

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peatland
water table
Holocene
climate
westerly
transfer function
regional climate
peat
South America
Climate
Late Holocene
Water
Tierra Del Fuego
Peat Bog
Assemblages
Belt

Keywords

  • Assulina muscorum
  • palaeoSig
  • Patagonia
  • Southern Annular Mode
  • southern westerly wind
  • UV-B

Cite this

van Bellen, S., Mauquoy, D., Hughes, P. D. M., Roland, T. P., Daley, T. J., Loader, N. J., ... Payne, R. J. (2016). Late-Holocene climate dynamics recorded in the peat bogs of Tierra del Fuego, South America. The Holocene, 26(3), 489-501. https://doi.org/10.1177/0959683615609756

Late-Holocene climate dynamics recorded in the peat bogs of Tierra del Fuego, South America. / van Bellen, Simon; Mauquoy, Dmitri; Hughes, Paul D. M.; Roland, Thomas P.; Daley, Tim J.; Loader, Neil J.; Street-Perrott, F. Alayne; Rice, Emma M.; Pancotto, Verónica A.; Payne, Richard J.

In: The Holocene, Vol. 26, No. 3, 01.03.2016, p. 489-501.

Research output: Contribution to journalArticle

van Bellen, S, Mauquoy, D, Hughes, PDM, Roland, TP, Daley, TJ, Loader, NJ, Street-Perrott, FA, Rice, EM, Pancotto, VA & Payne, RJ 2016, 'Late-Holocene climate dynamics recorded in the peat bogs of Tierra del Fuego, South America', The Holocene, vol. 26, no. 3, pp. 489-501. https://doi.org/10.1177/0959683615609756
van Bellen, Simon ; Mauquoy, Dmitri ; Hughes, Paul D. M. ; Roland, Thomas P. ; Daley, Tim J. ; Loader, Neil J. ; Street-Perrott, F. Alayne ; Rice, Emma M. ; Pancotto, Verónica A. ; Payne, Richard J. / Late-Holocene climate dynamics recorded in the peat bogs of Tierra del Fuego, South America. In: The Holocene. 2016 ; Vol. 26, No. 3. pp. 489-501.
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note = "Acknowledgements We thank Ricardo Muza and the Wildlife Conservation Society (WCS) Karukinka Park rangers for facilitating access to Karukinka Park. We also thank Fran{\cc}ois De Vleeschouwer, Ga{\"e}l Le Roux, Heleen Vanneste, S{\'e}bastien Bertrand, Zakaria Ghazoui and Jean-Yves De Vleeschouwer for fieldwork assistance. Nelson Bahamonde (INIA, Punta Arenas, Chile) and Ernesto Teneb (UMag, Punta Arenas, Chile) provided logistical support for the fieldwork in Chile. Dr Andrea Coronato (CADIC, Ushuaia) kindly provided logistical support for the research in Argentina. We also thank Ramiro Lopez for fieldwork assistance, Claudio Roig for access and permission to sample Tierra Australis and Audrey Innes for laboratory assistance. We appreciate the critical reviews by Graeme Swindles and an anonymous reviewer which improved the manuscript. Funding This work was supported by the Natural Environment Research Council (grant numbers NE/I022809/1, NE/I022981/1, NE/I022833/1 and NE/I023104/1).",
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AU - van Bellen, Simon

AU - Mauquoy, Dmitri

AU - Hughes, Paul D. M.

AU - Roland, Thomas P.

AU - Daley, Tim J.

AU - Loader, Neil J.

AU - Street-Perrott, F. Alayne

AU - Rice, Emma M.

AU - Pancotto, Verónica A.

AU - Payne, Richard J.

N1 - Acknowledgements We thank Ricardo Muza and the Wildlife Conservation Society (WCS) Karukinka Park rangers for facilitating access to Karukinka Park. We also thank François De Vleeschouwer, Gaël Le Roux, Heleen Vanneste, Sébastien Bertrand, Zakaria Ghazoui and Jean-Yves De Vleeschouwer for fieldwork assistance. Nelson Bahamonde (INIA, Punta Arenas, Chile) and Ernesto Teneb (UMag, Punta Arenas, Chile) provided logistical support for the fieldwork in Chile. Dr Andrea Coronato (CADIC, Ushuaia) kindly provided logistical support for the research in Argentina. We also thank Ramiro Lopez for fieldwork assistance, Claudio Roig for access and permission to sample Tierra Australis and Audrey Innes for laboratory assistance. We appreciate the critical reviews by Graeme Swindles and an anonymous reviewer which improved the manuscript. Funding This work was supported by the Natural Environment Research Council (grant numbers NE/I022809/1, NE/I022981/1, NE/I022833/1 and NE/I023104/1).

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N2 - The ombrotrophic peat bogs of Tierra del Fuego are located within the southern westerly wind belt (SWWB), which dominates climate variability in this region. We have reconstructed late-Holocene water-table depths from three peat bogs and aimed to relate these records to shifts in regional climate. Water-table depths were quantified by the analysis of testate amoeba assemblages, and a regional transfer function was used to infer past water-table depths. During the last 2000 years, testate amoeba assemblages have been relatively stable, with a dominance of Difflugia pulex and Difflugia pristis type, and an increase in Assulina muscorum and other Euglyphida at the top of each section. Multivariate analyses show that water-table depth remained the main environmental variable explaining assemblages along the TiA12 core, but reconstructions were not significant for the two other cores. In line with the low variability in assemblages, water tables were relatively stable during the last 2000 years. Slightly wetter conditions were found between ~1400 and 900 cal. BP and a pronounced recent dry shift was reconstructed in all of the three peat profiles. Considering the regional climatic context, this recent shift may have been forced by a decrease in precipitation and warmer conditions linked to an increase in the importance of the SWWB. Nevertheless, we cannot exclude the influence of higher UV-B radiation resulting from the local degradation of the ozone layer since the late 1970s, which may have had an additional effect on the relative presence of A. muscorum in the southern Patagonian region.

AB - The ombrotrophic peat bogs of Tierra del Fuego are located within the southern westerly wind belt (SWWB), which dominates climate variability in this region. We have reconstructed late-Holocene water-table depths from three peat bogs and aimed to relate these records to shifts in regional climate. Water-table depths were quantified by the analysis of testate amoeba assemblages, and a regional transfer function was used to infer past water-table depths. During the last 2000 years, testate amoeba assemblages have been relatively stable, with a dominance of Difflugia pulex and Difflugia pristis type, and an increase in Assulina muscorum and other Euglyphida at the top of each section. Multivariate analyses show that water-table depth remained the main environmental variable explaining assemblages along the TiA12 core, but reconstructions were not significant for the two other cores. In line with the low variability in assemblages, water tables were relatively stable during the last 2000 years. Slightly wetter conditions were found between ~1400 and 900 cal. BP and a pronounced recent dry shift was reconstructed in all of the three peat profiles. Considering the regional climatic context, this recent shift may have been forced by a decrease in precipitation and warmer conditions linked to an increase in the importance of the SWWB. Nevertheless, we cannot exclude the influence of higher UV-B radiation resulting from the local degradation of the ozone layer since the late 1970s, which may have had an additional effect on the relative presence of A. muscorum in the southern Patagonian region.

KW - Assulina muscorum

KW - palaeoSig

KW - Patagonia

KW - Southern Annular Mode

KW - southern westerly wind

KW - UV-B

U2 - 10.1177/0959683615609756

DO - 10.1177/0959683615609756

M3 - Article

VL - 26

SP - 489

EP - 501

JO - The Holocene

JF - The Holocene

SN - 0959-6836

IS - 3

ER -