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Late quaternary environmental changes in Patagonia as inferred from lacustrine fossil and extant ostracods

Cusminsky, Gabriela; Schwalb, Antje; Perez, Alejandra P.; Pineda, Daniela LU ; Viehberg, Finn; Whatley, Robin; Markgraf, Vera; Gilli, Andrea; Ariztegui, Daniel and Anselmetti, Flavio S. (2011) In Biological Journal of the Linnean Society 103(2). p.397-408
Abstract
In the present study, we compare modern and Quaternary ostracods from two lacustrine basins: Laguna Cari-Laufquen (41 degrees S) and Lago Cardiel (49 degrees S) in Patagonia. Taxonomic and quantitative analyses along with isotopic and chemical studies of the extant ostracod fauna indicate that distinct ostracod associations can be identified as a function of conductivity. Three ostracod associations can be distinguished: (1) springs, ponds and small creeks, characterized by low conductivity (e. g. 1015 ms cm(-1)); (2) lakes and permanent ponds, characterized by medium conductivity (e. g. 1625 ms cm(-1)) and (3) ephemeral lacustrine environments, generally characterized by higher conductivity (e. g. 16 480 ms cm(-1)) These modern ostracod... (More)
In the present study, we compare modern and Quaternary ostracods from two lacustrine basins: Laguna Cari-Laufquen (41 degrees S) and Lago Cardiel (49 degrees S) in Patagonia. Taxonomic and quantitative analyses along with isotopic and chemical studies of the extant ostracod fauna indicate that distinct ostracod associations can be identified as a function of conductivity. Three ostracod associations can be distinguished: (1) springs, ponds and small creeks, characterized by low conductivity (e. g. 1015 ms cm(-1)); (2) lakes and permanent ponds, characterized by medium conductivity (e. g. 1625 ms cm(-1)) and (3) ephemeral lacustrine environments, generally characterized by higher conductivity (e. g. 16 480 ms cm(-1)) These modern ostracod associations were also identified in older sequences from sediments outcropping in the Laguna Cari-Laufquen current shoreline, as well as in sediment cores from Lago Cardiel. The predominance of Limnocythere rionegroensis Cusminsky & Whatley in the Cari-Laufquen sections suggests the development of a saline and turbid lake during the Late Pleistocene and Early Holocene, and thus higher precipitation at these latitudes. Changes in ostracod abundance and associations have been observed in Lago Cardiel during the last approximately 16 000 calibrated years BP. Conductivity is known to change as a function of the ratio of precipitation to evaporation and a decrease in conductivity from the Late Pleistocene to the Middle Holocene suggests substantial hydrological variations (i. e. increase of the precipitation/ evaporation ratio suggests minor conductivity). These two examples show that ostracods provide an excellent proxy for interpreting palaeoclimatic and palaeoenvironmental changes in Patagonia. (C) 2011 The Linnean Society of London, Biological Journal of the Linnean Society, 2011, 103, 397-408. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
autoecology, non-marine ostracods, ostracods, Pleistocene to Recent, sequences, Southern South America
in
Biological Journal of the Linnean Society
volume
103
issue
2
pages
397 - 408
publisher
Linnean Society of London
external identifiers
  • wos:000291162800012
  • scopus:79957764121
ISSN
0024-4066
DOI
10.1111/j.1095-8312.2011.01650.x
language
English
LU publication?
yes
id
fecdfd27-38e0-4aa0-a748-cda89b5db34e (old id 1985615)
date added to LUP
2011-07-06 12:22:04
date last changed
2017-07-23 03:23:30
@article{fecdfd27-38e0-4aa0-a748-cda89b5db34e,
  abstract     = {In the present study, we compare modern and Quaternary ostracods from two lacustrine basins: Laguna Cari-Laufquen (41 degrees S) and Lago Cardiel (49 degrees S) in Patagonia. Taxonomic and quantitative analyses along with isotopic and chemical studies of the extant ostracod fauna indicate that distinct ostracod associations can be identified as a function of conductivity. Three ostracod associations can be distinguished: (1) springs, ponds and small creeks, characterized by low conductivity (e. g. 1015 ms cm(-1)); (2) lakes and permanent ponds, characterized by medium conductivity (e. g. 1625 ms cm(-1)) and (3) ephemeral lacustrine environments, generally characterized by higher conductivity (e. g. 16 480 ms cm(-1)) These modern ostracod associations were also identified in older sequences from sediments outcropping in the Laguna Cari-Laufquen current shoreline, as well as in sediment cores from Lago Cardiel. The predominance of Limnocythere rionegroensis Cusminsky & Whatley in the Cari-Laufquen sections suggests the development of a saline and turbid lake during the Late Pleistocene and Early Holocene, and thus higher precipitation at these latitudes. Changes in ostracod abundance and associations have been observed in Lago Cardiel during the last approximately 16 000 calibrated years BP. Conductivity is known to change as a function of the ratio of precipitation to evaporation and a decrease in conductivity from the Late Pleistocene to the Middle Holocene suggests substantial hydrological variations (i. e. increase of the precipitation/ evaporation ratio suggests minor conductivity). These two examples show that ostracods provide an excellent proxy for interpreting palaeoclimatic and palaeoenvironmental changes in Patagonia. (C) 2011 The Linnean Society of London, Biological Journal of the Linnean Society, 2011, 103, 397-408.},
  author       = {Cusminsky, Gabriela and Schwalb, Antje and Perez, Alejandra P. and Pineda, Daniela and Viehberg, Finn and Whatley, Robin and Markgraf, Vera and Gilli, Andrea and Ariztegui, Daniel and Anselmetti, Flavio S.},
  issn         = {0024-4066},
  keyword      = {autoecology,non-marine ostracods,ostracods,Pleistocene to Recent,sequences,Southern South America},
  language     = {eng},
  number       = {2},
  pages        = {397--408},
  publisher    = {Linnean Society of London},
  series       = {Biological Journal of the Linnean Society},
  title        = {Late quaternary environmental changes in Patagonia as inferred from lacustrine fossil and extant ostracods},
  url          = {http://dx.doi.org/10.1111/j.1095-8312.2011.01650.x},
  volume       = {103},
  year         = {2011},
}