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Late Holocene multi-proxy records of environmental change on the South Atlantic island Tristan da Cunha

Ljung, Karl LU ; Björck, Svante LU ; Hammarlund, Dan LU and Barnekow, Lena LU (2006) In Palaeogeography, Palaeoclimatology, Palaeoecology 241(3-4). p.539-560
Abstract
Sediment stratigraphies from three sites, one lake, one overgrown lake, and an exposed section, on the island Tristan da Cunha in the temperate South Atlantic were analysed by means of pollen analysis, total carbon, nitrogen and sulphur content determination, magnetic susceptibility measurements and detailed radiocarbon dating. The aim of these studies was to reconstruct the late Holocene vegetation and climatic variations. The oldest sediment sequence extends back to 2300 cal. years BP. The vegetation was relatively stable up to the arrival of humans in the 17th century. The appearance of the introduced taxon Rumex acetosa/acetosella at c. 300 cal. years BP and a subsequent decline in forest cover on the lowland plain provide evidence of... (More)
Sediment stratigraphies from three sites, one lake, one overgrown lake, and an exposed section, on the island Tristan da Cunha in the temperate South Atlantic were analysed by means of pollen analysis, total carbon, nitrogen and sulphur content determination, magnetic susceptibility measurements and detailed radiocarbon dating. The aim of these studies was to reconstruct the late Holocene vegetation and climatic variations. The oldest sediment sequence extends back to 2300 cal. years BP. The vegetation was relatively stable up to the arrival of humans in the 17th century. The appearance of the introduced taxon Rumex acetosa/acetosella at c. 300 cal. years BP and a subsequent decline in forest cover on the lowland plain provide evidence of substantial human influence on the vegetation well before the establishment of the first permanent settlement in the 19th century. Before the first anthropogenic influence centennial-scale fluctuations in the proxy records are interpreted as reflections of local hydrological changes, probably caused by variations in precipitation. As inferred mainly from changing proportions of pollen derived from telmatic and terrestrial taxa and corresponding changes in the deposition of mineral matter by fluvial erosion, lake levels were low between c. 1450 and 1050 cal. years BP, and high between c. 1050 and 300 cal. years BP. These variations coincide with known climatic changes in Southern Africa and in the North Atlantic, suggesting that the inferred hydrological changes on Tristan da Cunha were related to large-scale variations in the general oceanic and atmospheric circulation in the Atlantic region. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
pollen analysis, Late Holocene, vegetation history, hydrological, changes, South Atlantic Ocean, Tristan da Cunha
in
Palaeogeography, Palaeoclimatology, Palaeoecology
volume
241
issue
3-4
pages
539 - 560
publisher
Elsevier
external identifiers
  • wos:000242304300011
  • scopus:33750434855
ISSN
1872-616X
DOI
10.1016/j.palaeo.2006.05.007
language
English
LU publication?
yes
id
0e0e1b68-c654-4150-ac80-bae1fba93efa (old id 685435)
date added to LUP
2016-04-01 11:43:25
date last changed
2020-01-12 08:28:55
@article{0e0e1b68-c654-4150-ac80-bae1fba93efa,
  abstract     = {Sediment stratigraphies from three sites, one lake, one overgrown lake, and an exposed section, on the island Tristan da Cunha in the temperate South Atlantic were analysed by means of pollen analysis, total carbon, nitrogen and sulphur content determination, magnetic susceptibility measurements and detailed radiocarbon dating. The aim of these studies was to reconstruct the late Holocene vegetation and climatic variations. The oldest sediment sequence extends back to 2300 cal. years BP. The vegetation was relatively stable up to the arrival of humans in the 17th century. The appearance of the introduced taxon Rumex acetosa/acetosella at c. 300 cal. years BP and a subsequent decline in forest cover on the lowland plain provide evidence of substantial human influence on the vegetation well before the establishment of the first permanent settlement in the 19th century. Before the first anthropogenic influence centennial-scale fluctuations in the proxy records are interpreted as reflections of local hydrological changes, probably caused by variations in precipitation. As inferred mainly from changing proportions of pollen derived from telmatic and terrestrial taxa and corresponding changes in the deposition of mineral matter by fluvial erosion, lake levels were low between c. 1450 and 1050 cal. years BP, and high between c. 1050 and 300 cal. years BP. These variations coincide with known climatic changes in Southern Africa and in the North Atlantic, suggesting that the inferred hydrological changes on Tristan da Cunha were related to large-scale variations in the general oceanic and atmospheric circulation in the Atlantic region.},
  author       = {Ljung, Karl and Björck, Svante and Hammarlund, Dan and Barnekow, Lena},
  issn         = {1872-616X},
  language     = {eng},
  number       = {3-4},
  pages        = {539--560},
  publisher    = {Elsevier},
  series       = {Palaeogeography, Palaeoclimatology, Palaeoecology},
  title        = {Late Holocene multi-proxy records of environmental change on the South Atlantic island Tristan da Cunha},
  url          = {http://dx.doi.org/10.1016/j.palaeo.2006.05.007},
  doi          = {10.1016/j.palaeo.2006.05.007},
  volume       = {241},
  year         = {2006},
}