Cymbellonitzschia diluviana Hustedt (Bacillariophyceae): Habitat and auxosporulation

  • D. H. Jewson
  • S. Lowry
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 90)


The diatom Cymbellonitzschia diluviana Hustedt is an important indicator species in interglacial deposits but is rarely reported from contemporary sites. The presence of large populations in Lough Neagh, N. Ireland, made possible a study of its ecology and auxosporulation. The apical length of cells in the lake was usually between 7 and 25 µm, but in culture there was a broader range between 5 and 42 pm. Amongst smaller cells (< 11 µm), some (3%) were found with raphes on the ‘dorsal’ (i.e. convex side) rather than usual ‘ventral’ side. At cell division, both daughter cells had ‘hantzschioid’ symmetry. C. diluviana is found in alkaline waters (pH 7.6–9.0) but not usually where there is significant calcite deposition. Its present rarity is probably because its preferred habitat is now less common. In L. Neagh, C. diluviana was found on exposed rocky and sandy shores, but was particularly abundant in shifting sand bars. This highly abrasive and erosive environment requires cells to have good adhesion and the ability to withstand extended periods of burial. C. diluviana is essentially a ruderal species, adapted to habitats with high disturbance.

Key words

Cymbellonitzschia diluviana habitat auxosporulation ecology Lough Neagh N. Ireland interglacial indicator 


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Copyright information

© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  • D. H. Jewson
    • 1
  • S. Lowry
    • 1
  1. 1.Freshwater LaboratoryUniversity of Ulster, Traad Point, Ballyronan, Co.LondonderryNorthern Ireland

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