Hydrobiological Bulletin

, Volume 22, Issue 2, pp 147–155 | Cite as

Autecological investigations on marine diatoms. 5:Coscinodiscus concinnus W. Smith andRhizosolenia setigera Brightwell

  • J. W. M. Baars
Article

Abstract

The cold oligo-eurytherm diatomsCoscinodiscus concinnus W. Smith andRhizosolenia setigera Brightwell were cultured to determine their best competitive position by growth. Comparison of their generation times with those of other diatoms indicate that they reach this position between 6°C and 12°C. Both species grew between −1.5°C and about 20°C. The experiments indicate thatC. concinnus flowerings are possible in a deep water column, during periods of high light intensities. The simultaneous death of species in the upper layer is also caused by high light intensities.C. concinnus appeared in two morphological forms; the normal voluminous form, and a flatter form with a few intercalary bands only, filled with large oil-droplets. The latter appeared at 0°C and below, and at the upper temperature limit for growth of about 19°C–20°C. The separation of nov. spec. fromC. concinnus based on the absence or presence of a hyaline area and intercalary bands as identification characteristics should be reconsidered.

Keywords

Coscinodiscus concinnus Rhizosolenia setigera generation times competitive position morphological variations bloom 

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Copyright information

© Netherlands Hydrobiological Society 1988

Authors and Affiliations

  • J. W. M. Baars
    • 1
  1. 1.Abteilung für Systematiek und Geobotanik, Botanisches InstitutRheinisch Westfälische Technische HochuschuleAachenFRG

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