Ebook: Twelfth International Diatom Symposium: Proceedings of the Twelfth International Diatom Symposium, Renesse, The Netherlands, 30 August – 5 September 1992

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.

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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.

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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.

Content:
Front Matter....Pages i-xii
History of diatom research in The Netherlands and Flanders....Pages 1-9
Patterns of sexual reproduction in diatoms....Pages 11-20
Hustedt’s study of the diatom species Tetracyclus ellipticus: why history is not just a chronicle of events....Pages 21-30
Freshwater gomphonemoid diatom phylogeny: preliminary results....Pages 31-38
Morphological variability of the diatom Cyclotella atomus Hustedt var. atomus and C. atomus var. gracilis var. nov.....Pages 39-47
Morphology and taxonomy of Cyclotella tasmanica spec. nov, a newly described diatom from Tasmanian lakes....Pages 49-56
Morphology and ultrastructure of teratological forms of the diatoms Stephanodiscus niagarae and S. parvus (Bacillariophyceae) from Hamilton Harbour (Lake Ontario, Canada)....Pages 57-66
Morphological variation in populations of the diatom Asterionella ralfsii W. Smith from Nova Scotia, Canada....Pages 67-73
Observations on Cymbella mexicana (Ehrenb.) Cleve var. mexicana (Bacillariophyceae) with special reference to the band structure....Pages 75-80
Diatoms in surface sediments of the Indonesian Archipelago and their relation to hydrography....Pages 81-86
Diatoms in recent Atlantic (20° S to 70° N latitude) sediments: abundance patterns and what they mean....Pages 87-96
Diatom-inferred productivity changes in the eastern equatorial Pacific: The Quaternary record of ODP Leg 111, Site 677....Pages 97-101
Evolution of the Pretoria Saltpan — a diatom record spanning a full glacial-interglacial cycle....Pages 103-112
Diatoms and their preservation in the sediments of Lake Neuchatel (Switzerland) as evidence of past hydrological changes....Pages 113-128
Development of diatom-based salinity models for paleoclimatic research from lakes in British Columbia (Canada)....Pages 129-135
Toxic diatoms in western Washington waters (U.S. west coast)....Pages 137-151
Growth characteristics of the diatoms Pseudonitzschia pungens and P. fraudulenta exposed to ultraviolet radiation....Pages 153-158
Comparison of two domoic acid-producing diatoms: a review....Pages 159-166
Diatom bloom in the tidal freshwater zone of a turbid and shallow estuary, Rupert Bay (James Bay, Canada)....Pages 167-178
Diatoms in surface sediments of the Gotland Basin in the Baltic Sea....Pages 179-196
Diatom assemblages in superficial sediments from the Gulf of Riga, eastern Baltic Sea....Pages 197-205
A comparison of phytoplankton assemblages in the Chesapeake and Delaware estuaries (USA), with emphasis on diatoms....Pages 207-212
Spatial and temporal variation in community composition and photosynthetic characteristics of phytoplankton in the upper Westerschelde estuary (Belgium, SW Netherlands)....Pages 213-224
Short-term fluctuations in benthic diatom numbers on an intertidal sandflat in the Westerschelde estuary (Zeeland, The Netherlands)....Pages 225-233
Diatoms as a tool for reconstructing sedimentary environments in coastal wetlands; methodological aspects....Pages 235-242
Reconstruction of sedimentary environments in Holocene coastal deposits of the southwest Netherlands; the Poortvliet boring, a case study of palaeoenvironmental diatom research....Pages 243-249
Colonization processes of diatoms on artificial substrates in the River Danube near Budapest (Hungary)....Pages 251-261
Winter blooms of centric diatoms in the River Danube and in its side-arms near Budapest (Hungary)....Pages 263-273
Diatom communities in the Vanishing and Ornithologist Creek, King George Island, South Shetlands, Antarctica....Pages 275-284
Diatom communities of acidic mountain streams in Poland....Pages 285-296
The assessment of water quality in the Artois-Picardie water basin (France) by the use of diatom indices....Pages 297-306
Perspectives for the use of diatom assemblages in the water management policy of Overijssel (The Netherlands)....Pages 307-315
The recent palaeolimnology of Lake Nicholls, Mount Field National Park, Tasmania....Pages 317-325
The influence of catchment size on lake trophic status during the hemlock decline and recovery (4800 to 3500 BP) in southern Ontario lakes....Pages 327-333
Diatom assemblages and their relationship to environmental variables in lakes from the boreal forest-tundra ecotone near Yellowknife, Northwest Territories, Canada....Pages 335-342
Changes in diatom assemblages in the profundal sediments of two large oligohumic lakes in eastern Finland....Pages 343-349
Eutrophication and recovery of Lake Vesijarvi (south Finland): Diatom frustules in varved sediments over a 30-year period....Pages 351-359
The use of diatoms in monitoring the development of created wetlands at a sandmining site in Western Australia....Pages 361-370
Diatoms on herbarium macrophytes as indicators for water quality....Pages 371-390
Freshwater diatom ecology: developing an experimental approach as an aid to interpreting field data....Pages 391-404
Effects of nutrient (N, P, C) enrichment upon the littoral diatom community of an oligotrophic high-mountain lake....Pages 405-413
Diatom ecology in the phyllosphere of the common duckweed (Lemna minor L.)....Pages 415-426
Diatom preservation: experiments and observations on dissolution and breakage in modern and fossil material....Pages 427-436
Weighted averaging partial least squares regression (WA-PLS): an improved method for reconstructing environmental variables from species assemblages....Pages 437-445
A taxonomic database and linked iconograph for diatoms....Pages 447-452
“Omnidia”: software for taxonomy, calculation of diatom indices and inventories management....Pages 453-462
Generic names in current use in the diatoms: report on a workshop....Pages 463-471
“Linnaeus” and beyond: workshop report on multimedia tools for the identification and database storage of biodiversity....Pages 473-484
Toxic diatoms: report on a workshop....Pages 485-502
Back Matter....Pages 503-508
....Pages 509-513