Spatial variability of diatoms, subfossil macrophytes, and OC/N values in surface sediments of Lake Väike Juusa (southern Estonia)

The diatom assemblages, organic carbon to nitrogen (OC/N) ratio, and macrophyte remains in surface sediment samples from small dimictic Lake Vaike Juusa in southern Estonia were analysed. The results obtained show that changes in the composition of diatoms, macrophyte remains, and OC/N values are in logical dependence on the water depth in the studied site. So the species richness and number of periphytic diatoms are higher in samples collected in the littoral area, from depths up to 3.5 m. The abundance of macrophyte remains is also higher in the littoral. The OC/N ratio, which reflects the share of planktonic matter in the bulk organic matter, has a tendency to increase from the littoral towards the profundal zone. The data obtained by the three different methods enable to apply this approach to study lake-level change in the past.

[1]  S. Jevrejeva,et al.  Recent patterns of sediment accumulation in a small closed eutrophic lake revealed by the sediment records , 2004, Hydrobiologia.

[2]  R. Schmidt,et al.  Diatom-based conductivity and water-level inference models from eastern Tibetan (Qinghai-Xizang) Plateau lakes , 2003 .

[3]  T. Koff,et al.  Holocene lake-level changes and their reflection in the paleolimnological records of two lakes in northern Estonia , 2003 .

[4]  David M. Harper,et al.  Geochemical and physical characteristics of river and lake sediments at Naivasha, Kenya , 2002 .

[5]  J. Newbold,et al.  The influence of particle size on seston deposition in streams , 2001 .

[6]  P. Chambers,et al.  The interaction between water movement, sediment dynamics and submersed macrophytes , 2001, Hydrobiologia.

[7]  J. Punning,et al.  C/N ratio and fossil pigments in sediments ofsome Estonian lakes: an evidence of human impact andHolocene environmental change , 2000 .

[8]  A. Lotter,et al.  Do diatoms in the Swiss Alps reflect the length of ice-cover? , 2000, Aquatic Sciences.

[9]  A. Lotter.  Late-glacial and Holocene vegetation history and dynamics as shown by pollen and plant macrofossil analyses in annually laminated sediments from Soppensee, central Switzerland , 1999 .

[10]  D. Verschuren.  Influence of depth and mixing regime on sedimentation in a small, fluctuating tropical soda lake , 1999 .

[11]  W. Dean.  The carbon cycle and biogeochemical dynamics in lake sediments , 1999 .

[12]  R. Brugam,et al.  A diatom-inferred water depth reconstruction for an Upper Peninsula, Michigan, lake , 1998 .

[13]  G. Hannon,et al.  The plant-macrofossil record of past lake-level changes , 1997 .

[14]  J. Dearing.  Sedimentary indicators of lake-level changes in the humid temperate zone: a critical review , 1997 .

[15]  H. Lamb,et al.  Interpretation of Holocene lake-level change from diatom assemblages in Lake Sidi Ali, Middle Atlas, Morocco , 1994 .

[16]  P. Alhonen,et al.  Holocene lake-level changes in the Fennoscandian tree-line region, western Finnish Lapland: diatom and cladoceran evidence , 1994 .

[17]  B. Ammann.  Late-Quaternary Palynology at Lobsigensee - Regional Vegetation History and Local Lake Development , 1989 .

[18]  Digerfeldt Gunnar.  Studies on past lake-level fluctuations , 1986 .

[19]  H. H. Birks.  Plant macrofossils in Quaternary lake sediments , 1980 .

[20]  John P. Smol,et al.  Tracking Environmental Change Using Lake Sediments: Data Handling and Numerical Techniques , 2001 .

[21]  H. H. Birks,et al.  Introduction to the reconstruction of the late-glacial and early-Holocene aquatic ecosystems at Kråkenes Lake, Norway , 2000 .

[22]  H. H. Birks.  Aquatic macrophyte vegetation development in Kråkenes Lake, western Norway, during the late-glacial and early-Holocene , 2000 .

[23]  Ingemar Renberg,et al.  Diatoms as indicators of surface-water acidity. , 1999 .

[24]  J. Wolin.  Late Holocene lake-level and lake development signals in Lower Herring Lake, Michigan , 1996 .

[25]  J. Bloesch.  Mechanisms, measurement and importance of sediment resuspension in lakes , 1995 .

[26]  H. Duthie,et al.  Regression and Weighted Averaging Models Relating Surficial Sedimentary Diatom Assemblages to Water Depth in Lake Ontario , 1995 .

[27]  H. H. Birks.  Modern macrofossil assemblages in lake sediments in Minnesota , 1973 .