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

Research output: Contribution to journalArticle

13 Citations (Scopus)
6 Downloads (Pure)

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

Keywords

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

Fingerprint Dive into the research topics of 'Late-Holocene climate dynamics recorded in the peat bogs of Tierra del Fuego, South America'. Together they form a unique fingerprint.

  • Cite this

    van Bellen, S., Mauquoy, D., Hughes, P. D. M., Roland, T. P., Daley, T. J., Loader, N. J., Street-Perrott, F. A., Rice, E. M., Pancotto, V. A., & 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