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@ARTICLE{Moschen:3791,
      author       = {Moschen, R. and Lücke, A. and Parplies, J. and Schleser,
                      G. H.},
      title        = {{C}ontrols on the seasonal and interannual dynamics of
                      organic matter carbon isotopes in mesotrophic {L}ake
                      {H}olzmaar, {G}ermany},
      journal      = {Limnology and oceanography / Methods},
      volume       = {54},
      issn         = {1541-5856},
      address      = {Waco, Tex.},
      publisher    = {ASLO},
      reportid     = {PreJuSER-3791},
      pages        = {194 - 209},
      year         = {2009},
      note         = {This work was supported by a postdoctoral fellowship to
                      Robert Moschen and a Ph. D. grant to Jorn Parplies from
                      Forschungszentrum Julich. Additional financial support was
                      provided by the Federal Ministry of Education and Research
                      through the German Climate Research Program (DEKLIM, grant
                      01LD0001) and the project "Climate in Historical Times
                      KIHZ."},
      abstract     = {We investigated the particulate organic matter (POM) flux
                      and its stable carbon isotope composition in response to
                      changes in phytoplankton primary production and abiotic
                      environmental affects in mesotrophic Lake Holzmaar. POM
                      fluxes were determined by sediment traps emptied biweekly
                      from 1995 to 2004. Water chemical measurements and
                      meteorological observations were done concurrently. POM
                      fluxes within and directly below the lake's epilimnion were
                      relatively low during winter (<0.5 g m(-2) d(-1)) and
                      increased to 1.0-1.5 g m(-2) d(-1) during summer months
                      because of enlarged phytoplankton production. In contrast,
                      in the lake's hypolimnion a much higher POM flux was
                      observed during winter as result of resuspension of
                      particulate material from the lake's bottom. C:N (weight,
                      total organic carbon : total nitrogen) ratios of settling
                      organic matter vary around 8 at all three depths, indicating
                      a predominant phytoplankton origin of POM. The annual
                      epilimnic POM flux correlates with the epilimnic phosphate
                      concentration early in the seasonal cycle, indicating that
                      the supply of phosphate is the major control on the amount
                      of algal biomass. A recurrent annual oscillation of the
                      stable carbon isotope composition of POM with low delta C-13
                      values during winter and more positive values during summer
                      is interpreted as the result of phytoplankton primary
                      production. A close delta C-13(POM)-POM flux relationship
                      was observed, testifying to the primary dependence of delta
                      C-13(POM) on lacustrine primary production. Contrary to POM
                      flux, the epilimnic delta C-13(POM) signal is transferred to
                      the lakes bottom notwithstanding sediment resuspension and
                      microbial alteration. Our results demonstrate that
                      sedimentary stable carbon isotopes are a valuable proxy for
                      lacustrine paleo-productivity in Lake Holzmaar.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Limnology / Oceanography},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000265168800016},
      doi          = {10.4319/lo.2009.54.1.0194},
      url          = {https://juser.fz-juelich.de/record/3791},
}