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Present state of the systematics of planktonic coccoid green algae of inland waters

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Abstract

This review discusses the main developments in the systematics of coccoid green algae over the last three decades. The relationships of key groups of planktonic coccoid green algae are shown in the phylogenetic trees of Chlorophyceae and Trebouxiophyceae. The trees clearly show that the morphology of these algae do not adequately reflect their phylogenetic position. Different phylogenetic species can be hidden under one and the same morphotype. As most of the genera have a polyphyletic origin, they are in need of a systematic re-evaluation. Species classification using the phylogenetic species concept resulted in the establishment of new genera with smaller numbers of species and the description of new species that are not distinguishable by light microscopy. An overview of genera is given in tables and the revised designations of species as contained in the harmonized taxon list of the European Water Framework Directive lists is provided. In this transitional phase from an artificial to a more natural systematics of algae, field biologists and ecologists as well as molecular biologists must strengthen their interdisciplinary cooperation. The alignment of eco-functional groups of algae with true species identities using the barcoding conception will provide a better understanding of the interaction between organisms and their environment.

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Acknowledgments

We thank Eva Willén for her helpful discussions and improvement of the manuscript. Kiplagat Kotut revised the text with the main focus of improving on the language. We thank Ute Mischke for providing information on the harmonized taxon list of the European Water Framework Directive. The E. Schweizerbart’sche Verlagsbuchhandlung (Nägele & Obermiller), Stuttgart (www.schweizerbart.de) provided permission to copy figures of algae in Tables 2, 3, 4, and 5.

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Authors and Affiliations

  1. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, 16775, Stechlin, Germany

    Lothar Krienitz

  2. Department of General Botany, Faculty of Biology, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany

    Christina Bock

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  1. Lothar Krienitz
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  2. Christina Bock
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Correspondence to Lothar Krienitz.

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Guest editors: N. Salmaso, L. Naselli-Flores, L. Cerasino, G. Flaim, M. Tolotti & J. Padisák / Phytoplankton responses to human impacts at different scales: 16th workshop of the International Association of Phytoplankton Taxonomy and Ecology (IAP)

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Krienitz, L., Bock, C. Present state of the systematics of planktonic coccoid green algae of inland waters. Hydrobiologia 698, 295–326 (2012). https://doi.org/10.1007/s10750-012-1079-z

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  • DOI: https://doi.org/10.1007/s10750-012-1079-z

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