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The first German intercalibration exercise for benthic diatoms was conducted to improve the application of the implementation of the European Water Framework Directive for running waters and lakes in Germany. The intercalibration exercise revealed several taxonomic problems. Among others, considerable problems occurred with identifying and differentiating species of the following four groups: (I) Amphora indistincta Levkov and A. pediculus (Kützing) Grunow, (II) Cocconeis placentula var. euglypta Ehrenberg and C. placentula var. lineata (Ehrenberg) Van Heurck, (III) Navicula cryptotenella Lange-Bertalot and N. cryptotenelloides Lange-Bertalot and (IV) N. reichardtiana Lange-Bertalot and N. caterva Hohn & Hellermann. The taxonomic problems that emerged occurred due to both insufficient use of given taxonomic details (by limnologists) and ambiguous species descriptions and documentation (by taxonomists). Thus, we recommend to the applied limnologist to use the mandatory identification literature and to document any ambiguous valves during routine counts. Also, it would be desirable to further investigate certain species by taxonomists and, in general, to provide more basic data with species descriptions or in identification manuals. These measures will improve the use of diatoms as bioindicators and consequently benefit both applied limnologists and taxonomists.


Amphora benthic diatoms Cocconeis intercalibration exercise Navicula quality control taxonomy

Article Details

Author Biographies

Mirko Dreßler, University of Rostock

Institute of Bio-Science

Department for Botany and Botanical Garden

Sonja Kistenich, University of Rostock

Institute of Bio-Science

Department for Botany and Botanical Garden

Maria Kahlert, Swedish University of Agricultural Science Uppsala

Department of Aquatic Sciences and Assessment
How to Cite
Dreßler, M., Verweij, G., Kistenich, S., Kahlert, M., & Werner, P. (2015). Applied use of taxonomy: lessons learned from the first German intercalibration exercise for benthic diatoms. Acta Botanica Croatica, 74(2). Retrieved from