Twelfth International Diatom Symposium

1. Marine diatoms, climatic change

   1. Development of diatom-based salinity models for paleoclimatic research from lakes in British Columbia (Canada)

      • Brian F. Cumming, John P. Smol

      Pages 179-196

2. Toxic diatoms

   1. Toxic diatoms in western Washington waters (U.S. west coast)

      • Rita A. Horner, James R. Postel

      Pages 197-205

   2. Growth characteristics of the diatoms Pseudonitzschia pungens and P. fraudulenta exposed to ultraviolet radiation

      • P. E. Hargraves, J. Zhang, R. Wang, Y. Shimizu

      Pages 207-212

   3. Comparison of two domoic acid-producing diatoms: a review

      • M. C. Villac, D. L. Roelke, T. A. Villareal, G. A. Fryxell

      Pages 213-224

3. Brackish water

   1. Diatom bloom in the tidal freshwater zone of a turbid and shallow estuary, Rupert Bay (James Bay, Canada)

      • M. A. De Sève

      Pages 225-233

   2. Diatoms in surface sediments of the Gotland Basin in the Baltic Sea

      • Tuulikki Grönlund

      Pages 235-242

   3. Diatom assemblages in superficial sediments from the Gulf of Riga, eastern Baltic Sea

      • Maire Sakson, Urve Miller

      Pages 243-249

   4. A comparison of phytoplankton assemblages in the Chesapeake and Delaware estuaries (USA), with emphasis on diatoms

      • Harold G. Marshall, Raymond W. Alden

      Pages 251-261

   5. Spatial and temporal variation in community composition and photosynthetic characteristics of phytoplankton in the upper Westerschelde estuary (Belgium, SW Netherlands)

      • J. W. Rijstenbil, C. Bakker, R. H. Jackson, A. G. A. Merks, P. R. M. de Visscher

      Pages 263-273

   6. Short-term fluctuations in benthic diatom numbers on an intertidal sandflat in the Westerschelde estuary (Zeeland, The Netherlands)

      • Koen Sabbe

      Pages 275-284

   7. Diatoms as a tool for reconstructing sedimentary environments in coastal wetlands; methodological aspects

      • Peter C. Vos, Hein de Wolf

      Pages 285-296

   8. Reconstruction of sedimentary environments in Holocene coastal deposits of the southwest Netherlands; the Poortvliet boring, a case study of palaeoenvironmental diatom research

      • Peter C. Vos, Hein de Wolf

      Pages 297-306

4. Running water

   1. Colonization processes of diatoms on artificial substrates in the River Danube near Budapest (Hungary)

      • Éva Ács, Keve T. Kiss

      Pages 307-315

   2. Winter blooms of centric diatoms in the River Danube and in its side-arms near Budapest (Hungary)

      • K. T. Kiss, S. I. Genkal

      Pages 317-325

   3. Diatom communities in the Vanishing and Ornithologist Creek, King George Island, South Shetlands, Antarctica

      • B. Kawecka, M. Olech

      Pages 327-333

   4. Diatom communities of acidic mountain streams in Poland

      • Janina Kwandrans

      Pages 335-342

   5. The assessment of water quality in the Artois-Picardie water basin (France) by the use of diatom indices

      • J. Prygiel, M. Coste

      Pages 343-349

   6. Perspectives for the use of diatom assemblages in the water management policy of Overijssel (The Netherlands)

      • J. H. ten Cate, R. Maasdam, R. M. M. Roijackers

      Pages 351-359

5. Lakes

   1. The recent palaeolimnology of Lake Nicholls, Mount Field National Park, Tasmania

      • Nigel G. Cameron, Peter A. Tyler, Neil L. Rose, Simon Hutchinson, Peter G. Appleby

      Pages 361-370

   2. The influence of catchment size on lake trophic status during the hemlock decline and recovery (4800 to 3500 BP) in southern Ontario lakes

      • Roland I. Hall, John P. Smol

      Pages 371-390

The Twelfth International Diatom Symposium stressed how diatoms can be used to assess the human impact on natural waters, without neglecting other important fields of research.
As the frustules of many diatom species are relatively resistant to dissolution they are preserved in freshwater and marine sediments and provide a record of past environments on earth. In past decades they have been successfully used to reconstruct changes in water bodies evoked by changes in salinity, acidification and eutrophication. In the last few years diatom-inferred predictions of environmental variables have become much more quantitative.
In the most recent research reports the strong separation between palaeolimnological and neolimnological diatom research is fading, as palaeolimnologists are increasingly using modern calibration sets to infer past states of the environment. This quantitative approach is also very suitable for prediction of future changes in the biota of surface waters. Also ecological changes due to climatic modification have been investigated more thoroughly recently. A very important new research topic is the occurrence of toxic diatoms, particularly along the coasts of North America. These proceedings are intended to be a balanced view of such modern developments in diatom research. They should also be of interest to non-specialists in diatoms, who can use the results of diatom research as a tool in a more general taxonomic, ecological and geological context.

• Danube
• Ecology
• Eutrophication
• benthic
• biodiversity
• ecotone
• environment
• limnology
• macrophytes
• phytoplankton
• plankton
• water quality
• wetland

• Department of Aquatic Ecology, DLO-Institute for Forestry and Nature Research, Wageningen, The Netherlands

  Herman Dam

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