Abstracts of the 25Th International Diatom Symposium Berlin 25–30 June 2018 – Botanic Garden and Botanical Museum Berlin Freie Universität Berlin
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Abstracts of the 25th International Diatom Symposium Berlin 25–30 June 2018 Botanic Garden and Botanical Museum Berlin, Freie Universität Berlin Abstracts of the 25th International Diatom Symposium Berlin 25–30 June 2018 – Botanic Garden and Botanical Museum Berlin Freie Universität Berlin 25th International Diatom Symposium – Berlin 2018 Published by BGBM Press Botanic Garden and Botanical Museum Berlin Freie Universität Berlin LOCAL ORGANIZING COMMITTEE: Nélida Abarca, Regine Jahn, Wolf-Henning Kusber, Demetrio Mora, Jonas Zimmermann YOUNG DIATOMISTS: Xavier Benito Granell, USA; Andrea Burfeid, Spain; Demetrio Mora, Germany; Hannah Vossel, Germany SCIENTIFIC COMMITTEE: Leanne Armand, Australia; Eileen Cox, UK; Sarah Davies, UK; Mark Edlund, USA; Paul Hamilton, Canada; Richard Jordan, Japan; Keely Mills, UK; Reinhard Pienitz, Canada; Marina Potapova, USA; Oscar Romero, Germany; Sarah Spaulding, USA; Ines Sunesen, Argentina; Rosa Trobajo, Spain © 2018 The Authors. The abstracts published in this volume are distributed under the Creative Commons Attribution International 4.0 Licence (CC BY 4.0 – http://creativecommons.org/licenses/by/4.0/). ISBN 978-3-946292-27-2 doi: https://doi.org/10.3372/ids2018 Published online on 25 June 2018 by the Botanic Garden and Botanical Museum Berlin, Freie Universität Berlin – www.bgbm.org CITATION: Kusber W.-H., Abarca N., Van A. L. & Jahn R. (ed.) 2018: Abstracts of the 25th International Diatom Symposium, Berlin 25–30 June 2018. – Berlin: Botanic Garden and Botanical Museum Berlin, Freie Universität Berlin. doi: https://doi.org/10.3372/ids2018 ADDRESS OF THE EDITORS: Wolf-Henning Kusber, Nélida Abarca, Anh Lina Van, Regine Jahn Botanic Garden and Botanical Museum Berlin, Freie Universität Berlin Königin-Luise-Str. 6–8 D-14195 Berlin Germany [email protected], [email protected], [email protected], [email protected] Front cover: IDS 2018 Logo by N. Abarca; back cover: images of living diatoms by O. Skibbe 2 25th International Diatom Symposium – Berlin 2018 Preface The 25th International Diatom Symposium (IDS 2018) was held at the Seminaris Cube and at the Botanic Garden and Botanical Museum, Freie Universität Berlin (BGBM), from 25 – 30 June 2018. The Research Group Diatoms at the BGBM was honored to hold this 25th Symposium in Germany again. After all, these symposia were started in Bremerhaven, Germany in 1970; the 3rd took place in Kiel, Germany, also. The first four were named Symposium on Recent and Fossil Marine Diatoms (London, UK, 1972; Oslo, Norway, 1976). The 5th took place in Antwerp, Belgium (1978) and the 6th in Budapest, Hungary (1980) and were called Symposium on Recent and Fossil Diatoms. From the 7th Symposium on, the current name International Diatom Symposium was used and the meetings became more international. Five Symposia have been held in the USA (Philadelphia, 1982; San Francisco, 1990; St. Paul, 2010) and Canada (Ottawa, 2002; Québec, 2016), three in Asia: Japan (Tokyo, 1996), Russia (Irkutsk, 2006), China (Nanjing, 2014), and one in Australia (Perth, 1998). The symposia in Europe took place in Paris, France (1984), Bristol, UK (1986), Joensuu, Finland (1988), Zeeland, Netherlands (1992), Maratea, Italy (1994), Athens, Greece (2000), Misdroye, Poland (2004), Dubrovnik, Croatia (2008), and in Ghent, Belgium (2012). At the 25th symposium, 210 participants from 43 countries of all five continents took part in and contributed to 83 Session Talks, 6 Keynote Talks, 10 Workshops and 100 Posters. Important topics of this symposium were: Taxonomy & Phylogeny, Freshwater Biogeography, Bioindication, Marine & Brackish Biodiversity, Paleoclimatology, Names & Collections. Current important topics were picked up in the Session Environmental DNA & High Throughput Sequencing (eDNA & HTS) by the diatom group in the DNAquanet EU CostAction. The International Code of Nomenclature for algae, fungi and plants (ICNafp) 2018 had just been published before the IDS 2018 and its implications for diatom research were covered in a keynote talk by the chair of the editorial committee. For the first time, the Young Diatomists who had founded themselves at the last symposium in Québec organized their own day (30 June) with 60 participants in 4 Workshops. As in Québec, they had organized Speed Talks within the regular sessions, which were a lot a fun to listen to for the elder diatomists. 20 travel awards were financed by the ISDR (International Society for Diatom Research) and the IUBS (International Union for Biological Sciences), and a number of prizes for the best talks, posters and speed talks were awarded. In this Abstract Book, 189 abstracts are printed alphabetically, no matter if they were presented as talks, posters, or in workshops. In the index, about 600 (co-)authors are listed; in the text more than 800 diatom taxa are referred to. This is substantial reading material for a symposium of less than a week’s length. We hope that you enjoyed meeting with colleagues and friends in Berlin in summer 2018, Regine Jahn, Nélida Abarca, Wolf-Henning Kusber, Demetrio Mora & Jonas Zimmermann 3 25th International Diatom Symposium – Berlin 2018 4 25th International Diatom Symposium – Berlin 2018 New data on the postglacial development of the Kandalaksha Bay coast (White Sea) inferred from diatom assemblages Agafonova, Elizaveta1,2,* & Polyakova, Yelena1 1Lomonosov Moscow State University, Moscow, Russia, *e-mail: [email protected], 2P.P. Shirshov Institute of Oceanology, Moscow, Russia. Recently, interest in the dynamics of the natural conditions of the White Sea coast has significantly increased due to a number of unsolved and topical issues: isostatic and tectonic movements’ role in the current relief formation; the relief-value, chronology and spread of ice cover during the last glacial period; the reconstruction of sea level fluctuations during the Holocene and its forecast (Polyakova 1997). We aim to reconstruct the history of relief development, the main features of sedimentation and the dynamics of the natural environment of the Kandalaksha Bay coast of the White Sea during the Holocene using diatom analysis. To achieve this goal, an analysis of data on geomorphological structure of the Karelian and Tersky coasts and diatom analysis of the coast’s lacustrine-boggy deposits were made (104 samples). We analyzed six sediment core sections from two study sites of the Kandalaksha Bay coast and obtained results showing that in all studied sediment core sections of the Karelian coast, the identified diatom ecozones characterize the gradual transition from an open sea bay to a modern lake through the stage of a meromictic reservoir. The deposits of the Tersky coast contain diatom assemblages characterized by low diversity and low concentrations. In the sediment core sections of the Tersky coast, we found the stages of isolation from the ancient sea water bodies, which are similar in diatom composition with meromictic lakes of the Karelian coast, but the lithology of the deposits differs greatly. Despite the fact that the Karelian and Tersky coasts are located on different sides of the Kandalaksha graben, the uplift rates of them from the end of the Atlantic were very close. We identified three stages in the history of environmental development of the Kandalaksha Bay coast. In each of them, significant changes in the relief and the natural environment took place. The first stage (from the late Dryas to the beginning of the Boreal period) is the cold marine stage, the second (from the second half of the Boreal to the beginning of the Subboreal) is a transitional one thatis characterized by the isolation of reservoirs and the formation of meromictic lakes, and the third is a modern freshwater stage (started in the middle of the Subboreal time). Owing to the competent choice of the objects of research, we created a strong base for paleogeographic reconstructions. Also, new unique data on the diatoms composition in the coastal peat bogs of the Tersky coast, which has been much less studied than Karelian, have been obtained. Polyakova Y. 1997: The Eurasian Arctic Seas during the Late Cenozoic. – Moscow: Scientific World. [In Russian]. 5 25th International Diatom Symposium – Berlin 2018 Revision of the genus Sieminskia with description of valve ultrastructure Al-Handal, Adil Y.1; Frankovich, Tomas 2; Pennesi, Chiara 3 & Wulff, Angela 1 1Department of Biological and Environmental Sciences, Gothenburg University, Sweden, 2Department of Biological Sciences, Marine Science Program, Florida International University, Miami, USA, 3Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy. In this work we present an ultrastructure-based revision of the diatom genus Sieminskia Metzeltin & Lange-Bert. using light and electron microscopy. Only one species belongs to Sieminskia but appeared in the literature with different synonyms. The genus was established in 1998 by Metzeltin and Lange-Bertalot to accommodate two Navicula Bory species; Navicula zeta Cleve and Navicula wohlenbergii C. Brockmann. Another species described by Hagelstein in 1939; Navicula expansa, appeared to be synonym to N. zeta. A taxonomic comparison with the related genera Parlibellus E. J. Cox, Cosmioneis D. G. Mann & Stickle, Scolioneis D. G. Mann and Stauroneis Ehrenb. is provided. Sieminskia zeta Metzeltin & Lange-Bertalot (the valid name of the only species of the genus), is widely distributed in brackish-water but its valve structure has not been fully described. The present work is based on