% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Mayr:6425,
      author       = {Mayr, C. and Lücke, A. and Maidana, N. I. and Wille, M.
                      and Haberzettl, T. and Corbella, H. and Ohlendorf, C. and
                      Schäbitz, F. and Fey, M. and Jansen, S. and Zolitschka, B.},
      title        = {{I}sotopic fingerprints on lacustrine organic matter from
                      {L}aguna {P}otrok {A}ike (southern {P}atagonia, {A}rgentina)
                      reflect environmental changes during the last 16,000 years},
      journal      = {Journal of Paleolimnology},
      volume       = {42},
      issn         = {1129-5767},
      address      = {Verbania},
      publisher    = {Ist.},
      reportid     = {PreJuSER-6425},
      pages        = {81 - 102},
      year         = {2009},
      note         = {We are grateful to H. Wissel for assistance with isotope
                      analyses and to S. Stahl for elemental analyses. The authors
                      thank H. Kling for inspiring discussions about and
                      determination of cyanobacteria. L. Hedena r s is thanked for
                      determining aquatic mosses. Logistic support by C. Kennard,
                      J. Moreteau, and G. Oliva is gratefully acknowledged. The
                      article benefited greatly from the suggestions of P. Meyers
                      and an anonymous reviewer and we thank T. Whitmore for
                      editorial handling. This research was financially supported
                      by the German Federal Ministry of Education and Research in
                      the framework of the German Climate Research Program DEKLIM
                      (Grants 01 LD 0034 and 0035).},
      abstract     = {A combination of carbon-to-nitrogen ratios (TOC/TN), Rock
                      Eval-analyses, and stable isotope values of bulk nitrogen
                      (delta N-15) and organic carbon (delta C-13(org)) was used
                      to characterize bulk organic matter (OM) of a piston core
                      from the Patagonian maar lake Laguna Potrok Aike (Argentina)
                      for the purpose of palaeoenvironmental reconstruction.
                      Sedimentary data were compared with geochemical signatures
                      of potential OM sources from Laguna Potrok Aike and its
                      catchment area to identify the sources of sedimentary OM.
                      Correlation patterns between isotopic data and TOC/TN ratios
                      allowed differentiation of five distinct phases with
                      different OM composition. Before 8470 calibrated C-14 years
                      before present (cal. yrs BP) and after 7400 cal. yrs BP,
                      isotopic and organo-geochemical fingerprints indicate that
                      the sediments of Laguna Potrok Aike consist predominantly of
                      soil and diatom OM with varying admixtures of cyanobacterial
                      and aquatic macrophyte OM. For a short phase of the early
                      Holocene (ca. 8470-7400 cal. yrs BP), however, extremely
                      high input of soil OM is implied by isotopic fingerprints.
                      Previous seismic and geochronological results indicate a
                      severe lake-level drop of 33 m below present-day shortly
                      before 6590 cal. yrs BP. It is suggested that this lake
                      level drop was accompanied by increased erosion of shore
                      banks and channel incision enhancing soil OM deposition in
                      the lake basin. Thus, isotopic data can be linked to
                      hydrological variations at Laguna Potrok Aike and allow a
                      more precise dating of this extremely low lake level. An
                      isotopic mixing model was used including four different
                      sources (soil, cyanobacteria, diatom and aquatic macrophyte
                      OM) to model OM variations and the model results were
                      compared with quantitative microfossil data.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {570},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Geosciences, Multidisciplinary /
                      Limnology},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000266911700007},
      doi          = {10.1007/s10933-008-9249-8},
      url          = {https://juser.fz-juelich.de/record/6425},
}