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Hydrobiologia

, Volume 513, Issue 1–3, pp 27–38 | Cite as

Response of phytoplankton communities to salinity changes – a mesocosm approach

  • Renata Pilkaitytë
  • Arne Schoor
  • Hendrik Schubert
Article

Abstract

The response of natural phytoplankton communities, originating from oligohaline brackish water systems, to salinity changes (3–12 PSU) has been studied in small-scale mesocosms. Simultaneously, their reaction on iron manipulations was tested. The experiments, each lasting 7 days, were repeated three times at different dates. Treatments were evaluated with respect to biomass development (Chl a concentration), photosynthesis behaviour, and rough taxonomic composition. The investigated phytoplankton communities were dominated by cyanobacteria. Salt addition was not effective for overall phytoplankton biomass development. Filamentous cyanobacteria, however, were promoted by NaCl enrichments. Dark yield and non-photochemical quenching of fluorescence (NPQ) analyses revealed differences for treatments in dependence on iron supplements. Iron partially seemed to dampen the effects of salt shocks, and iron addition reduced both, capacity and irradiance dependency of NPQ, irrespective of the NaCl treatment.

phytoplankton salinity iron photosynthesis mesocosm 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Renata Pilkaitytë
    • 1
  • Arne Schoor
    • 2
  • Hendrik Schubert
    • 2
  1. 1.Coastal Research and Planning InstituteKlaipėda UniversityKlaipėdaLithuania
  2. 2.Institute of Aquatic EcologyUniversity of RostockRostockGermany

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