Twelfth International Diatom Symposium

History of diatom research in The Netherlands and Flanders.- Patterns of sexual reproduction in diatoms.- Hustedt’s study of the diatom species Tetracyclus ellipticus: why history is not just a chronicle of events.- Freshwater gomphonemoid diatom phylogeny: preliminary results.- Morphological variability of the diatom Cyclotella atomus Hustedt var. atomus and C. atomus var gracilis var. nov..- Morphology and taxonomy of Cyclotella tasmanica spec. nov., a newly described diatom from Tasmanian lakes.- Morphology and ultrastructure of teratological forms of the diatoms Stephanodiscus niagarae and S. parvus (Bacillariophyceae) from Hamilton Harbour (Lake Ontario, Canada).- Morphological variation in populations of the diatom Asterionella ralfsii W. Smith from Nova Scotia, Canada.- Observations on Cymbella mexicana (Ehrenb.) Cleve var. mexicana (Bacillariophyceae) with special reference to the band structure.- Amphora margalefii Tomàs var. lacustris P. Sánchez var. nova, a new brackish water diatom.- Cymbellonitzschia diluviana Hustedt (B acillariophyceae): Habitat and auxosporulation.- Surirella sparsipunctata Hustedt and S. sparsipunctata var. laevis Hustedt (Bacillariophyceae), a light and electron microscopical study.- Eucampia Index as an indicator of the Late Pleistocene oscillations of the winter sea-ice extent at the ODP Leg 119 Site 745B at the Kerguelen Plateau.- Diatoms in surface sediments of the Indonesian Archipelago and their relation to hydrography.- Diatoms in recent Atlantic (20 ° S to 70 °N latitude) sediments: abundance patterns and what they mean.- Diatom-inferred productivity changes in the Eastern Equatorial Pacific: The Quaternary record of ODP Leg 111, Site 677.- Actinoptychus splendens (Shadbolt) Ralfs (Bacillariophyceae): a biostratigraphicmarker for the later part of the Holocene coastal deposits along the southern North Sea.- Evolution of the Pretoria Saltpan — a diatom record spanning a full glacial—interglacial cycle.- Diatoms and their preservation in the sediments of Lake Neuchâtel (Switzerland) as evidence of past hydrological changes.- Development of diatom-based salinity models for paleoclimatic research from lakes in British Columbia (Canada).- Toxic diatoms in western Washington waters (U.S. west coast).- Growth characteristics of the diatoms Pseudonitzschia pungens and P. fraudulenta exposed to ultraviolet radiation.- Comparison of two domoic acid-producing diatoms: a review.- Diatom bloom in the tidal freshwater zone of a turbid and shallow estuary, Rupert Bay (James Bay, Canada).- Diatoms in surface sediments of the Gotland Basin in the Baltic Sea.- Diatom assemblages in superficial sediments from the Gulf of Riga, eastern Baltic Sea.- A comparison of phytoplankton assemblages in the Chesapeake and Delaware estuaries (U.S.A.), with emphasis on diatoms.- Spatial and temporal variation in community composition and photosynthetic characteristics of phytoplankton in the upper Westerschelde estuary (Belgium, SW Netherlands).- Short-terns fluctuations in benthic diatom numbers on an intertidal sandflat in the Westerschelde estuary (Zeeland, The Netherlands).- Diatoms as a tool for reconstructing sedimentary environments in coastal wetlands; methodological aspects.- Reconstruction of sedimentary environments in Holocene coastal deposits of the southwest Netherlands; the Poortvliet boring, a case study of palaeoenvironmental diatom research.- Colonization processes of diatoms on artificial substrates in the River Danube near Budapest (Hungary).- Winter blooms of centric diatoms in the RiverDanube and in its side-arms near Budapest (Hungary).- Diatom communities in the Vanishing and Ornithologist Creek (King George Island, South Shetlands, Antarctica).- Diatom communities of acidic mountain streams in Poland.- The assessment of water quality in the Artois-Picardie water basin (France) by the use of diatom indices.- Perspectives for the use of diatom assemblages in the water management policy of Overijssel (The Netherlands).- The recent palaeolimnology of Lake Nicholls, Mount Field National Park, Tasmania.- The influence of catchment size on lake trophic status during the hemlock decline and recovery (4800 to 3500 BP) in southern Ontario lakes.- Diatom assemblages and their relationship to environmental variables in lakes from the boreal forest-tundra ecotone near Yellowknife, Northwest Territories, Canada.- Changes in diatom assemblages in the profundal sediments of two large oligohumic lakes in eastern Finland.- Eutrophication and recovery of Lake Vesijärvi (south Finland): Diatom frustules in varved sediments over a 30-year period.- The use of diatoms in monitoring the development of created wetlands at a sandmining site in Western Australia.- Diatoms on herbarium macrophytes as indicators for water quality.- Freshwater diatom ecology: developing an experimental approach as an aid to interpreting field data.- Effects of nutrient (N, P, C) enrichment upon the littoral diatom community of an oligotrophic high-mountain lake.- Diatom ecology in the phyllosphere of the common duckweed (Lemna minor L.).- Diatom preservation: experiments and observations on dissolution and breakage in modern and fossil material.- Weighted averaging partial least squares regression (WA-PLS): an improved method for reconstructing environmental variables from speciesassemblages.- A taxonomic database and linked iconograph for diatoms.- ‘Omnidia’: software for taxonomy, calculation of diatom indices and inventories management.- Generic names in current use in the diatoms: report on a workshop.- ‘Linnaeus’ and beyond: workshop report on multimedia tools for the identification and database storage of biodiversity.- Toxic diatoms: report on a workshop.