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Hydrobiologia

, Volume 614, Issue 1, pp 373–386 | Cite as

Ecological variation within Sellaphora species complexes (Bacillariophyceae): specialists or generalists?

  • Aloisie PoulíčkováEmail author
  • Jana Špačková
  • Martyn G. Kelly
  • Martin Duchoslav
  • David G. Mann
Primary research paper

Abstract

The genus Sellaphora has become a model system for studies of the species concept, speciation and automated identification in diatoms. Three species, S. pupula, S. bacillum and S. laevissima, have proved to be complexes containing several or many species, which are difficult to distinguish morphologically but which are genetically differentiated and (where tested) reproductively isolated. Until now, however, there has been little information about the ecology of the species within this complex, except in relation to parasite sensitivity. In order to test whether semi- and pseudo-cryptic Sellaphora species are ecologically differentiated with respect to trophic status, we used tools recently developed in the UK in response to the EU Water Framework Directive (WFD). Diatom samples from three substrata (plants, rocks, sediment) were taken from 22 lakes in Scotland and England, covering a gradient from oligotrophic mountain lakes to eutrophic lowland ponds. The epilithic and epiphytic diatom assemblages were used to evaluate lake trophic status according to the UK WFD assessment system and showed that there was a strong environmental gradient in the dataset. Sellaphora species occurred in the sediment-derived epipelon and their distributions were analysed in relation to the trophic gradient. A total of 28 Sellaphora phenodemes (putative species) were found, and some of them differed in their environmental demands. Two groups were distinguished: (1) a group indicating rather oligotrophic conditions and containing several demes with linear valves and subcapitate or capitate poles (referred to here as S. [pupula] cap-A, cap-B and cap-C and (2) a group occurring in eutrophic lakes and containing the recently described species S. blackfordensis, S. capitata and S. obesa, as well as S. [pupula] Φ ‘small lanceolate’. The data obtained are also discussed with respect to Finlay’s hypothesis on microalgal cosmopolitanism.

Keywords

Epipelon Diatoms Cryptic species Ecological differentiation Water Framework Directive Ubiquity hypothesis 

Notes

Acknowledgements

The helpful comments of two anonymous reviewers are gratefully acknowledged. This research was supported by project GACR 206/07/0115 from the Czech Republic and an EU Framework 6 SYNTHESYS GB-TAF-643 award to Assoc. Prof. Aloisie Poulíčková.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Aloisie Poulíčková
    • 1
    Email author
  • Jana Špačková
    • 1
  • Martyn G. Kelly
    • 2
  • Martin Duchoslav
    • 1
  • David G. Mann
    • 3
  1. 1.Department of Botany, Faculty of SciencePalacký UniversityOlomoucCzech Republic
  2. 2.Bowburn ConsultancyBowburnUK
  3. 3.Royal Botanic GardenEdinburghScotland, UK

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