, Volume 594, Issue 1, pp 5–17 | Cite as

Restoring Daphnia lacustris G.O. Sars, 1862 (Crustacea, Anomopoda): a cryptic species in the Daphnia longispina group

  • Jens Petter NilssenEmail author
  • Anders Hobæk
  • Adam Petrusek
  • Morten Skage


While molecular markers have revealed several distinct species within the Daphnia longispina group, there is a need to reconcile these species with traditional nomenclature. Here we show that one such species, called D. longispina in recent literature based on molecular markers, can reliably be associated with the described taxon Daphnia lacustris G.O. Sars, 1862. Both mitochondrial and nuclear molecular markers readily distinguish this species from others in the D. longispina group. D. lacustris is absent in the region from which D. longispina was first described (Denmark), and the designation D. longispina must be reserved for another widespread species represented by Danish lineages. While the diagnosis of D. lacustris (and other species of the D. longispina group) by molecular markers is unequivocal, distinguishing it morphologically from other species is still problematic. The presently known distribution range of D. lacustris includes most of Norway, northern Finland and a single lake in the Polish Tatra Mountains. Its typical habitat is oligotrophic lakes without intense fish predation.


Nomenclature Genetic markers 12S mitochondrial gene ITS Biogeography Pelagic predation 



This work constitutes part of a collaborate effort to elucidate species delimitation and nomenclature of the European D. longispina group, which has involved an open exchange of samples and data as well as joint analyses. A number of persons and institutions have unselfishly supported this initiative in various ways. A sample from the Polish locality was obtained from Martin Černý, and 12S sequences of Finnish populations from Klaus Schwenk. During a stay at the Zoological Museum in Copenhagen, JPN was especially supported by Jørgen Olesen. At the Zoological Museum in Oslo we were kindly supported by Marit E. Christiansen, who also shared her great knowledge on Georg Ossian Sars with us, and by Åse Wilhelmsen at the G.O. Sars’ collection. We are grateful to Svein Birger Wærvågen, Wenche Emely Nessler, Dag Klaveness, Jan Ivar Koksvik and Jørn Enerud for field assistance and/or discussions, and to the staff at the Norwegian National Library, Oslo, for their help with the Sars collection deposited there. JPN acknowledges economical support for biogeographical studies on Norwegian zooplankton from the counties of Aust-Agder, Oslo and Akershus, Buskerud, Telemark, Vestfold and Oppland. AH was supported by the Norwegian Research Council (Grant 121181/720) and by internal funding from the Norwegian Institute for Water Research. AP was supported by the Czech Ministry of Education (project MSM0021620828). His work has been partially carried out during stays at Johann Wolfgang Goethe Universität in Frankfurt am Main (financed by the German Academic Exchange Service DAAD) and Katholieke Universiteit in Leuven (financed by Czech-Flemish bilateral cooperation in research and development). The support by Klaus Schwenk, Nora Brede, Luc De Meester and Joachim Mergeay during these stays is gratefully acknowledged. We thank three anonymous referees, whose comments helped improve the article. Finally, thanks are due to Lawrence Kirkendall for linguistic corrections.


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Jens Petter Nilssen
    • 1
    Email author
  • Anders Hobæk
    • 2
  • Adam Petrusek
    • 3
  • Morten Skage
    • 4
  1. 1.Division of Freshwater and Marine SciencesNiels Henrik Abel CentreGjerstadNorway
  2. 2.Norwegian Institute for Water ResearchRegional Office BergenBergenNorway
  3. 3.Faculty of Science, Department of EcologyCharles University in PraguePrague 2Czechia
  4. 4.Department of BiologyUniversity of BergenBergenNorway

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