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Chlorophyll at fluroprobe station PO324_14-FLP19

Publication Date
DOI: 10.1594/pangaea.712199
  • Chlorophyll A
  • Chlorophyll A
  • Blue Greens
  • Chlorophyll A
  • Cryptophyta
  • Chlorophyll A
  • Diatoms
  • Chlorophyll A
  • Green Algae
  • Fluroprobe
  • Gg05_08
  • Global Ocean Ecosystem Dynamics
  • Globec
  • Po324
  • Po324_14-Flp19
  • Poseidon
  • Temperature
  • Water
  • Tmf043
  • Transmission Of Light
  • Yellow Substance


ORIGINAL PAPER Phytoplankton, protozooplankton and nutrient dynamics in the Bornholm Basin (Baltic Sea) in 2002–2003 during the German GLOBEC Project Justus E. E. van Beusekom Æ Dirk Mengedoht Æ Christina B. Augustin Æ Mario Schilling Æ Maarten Boersma Received: 26 March 2006 / Accepted: 16 March 2007 / Published online: 18 August 2007 � Springer-Verlag 2007 Abstract From March 2002 to until April 2003 we investigated the seasonal nutrient and phytoplankton dynamics in the central Bornholm Basin (Baltic Sea) within the framework of the German GLOBEC Project. We choose a nested approach consisting of vertical fluores- cence profiles, phytoplankton counts and nutrient analyses. The Fluoroprobe (MultiProbe, BBE Moldaenke) is capable of distinguishing four algal groups (Cryptophyceae, Cyanophyceae, Chlorophyceae, Bacillariophyceae + Dinophyceae). Winter nutrient concentrations were about 5 lM NO3 and 0.5 lM PO4 in the central Basin. The spring phytoplankton bloom was dominated by the diatom Skeletonema sp. and reached a maximum of about 270 lg C/l before the onset of the seasonal stratification. Proto- zooplankton was dominated by the Mesodinium rubrum (a phototrophic ciliate = Myrionecta rubra) and reached a maximum biomass of about 200–300 lg C/l about 2 weeks after the demise of the diatom spring bloom. During summer, the water column was stratified and a subsurface maximum developed near the thermocline consisting of Bacillariophyceae, Cryptophycea and other phototrophic flagellates. Phytoplankton and protozooplankton biomass was generally low. Nutrient concentrations point towards a nitrogen limitation during this period. The stratification period ended during September and surface nutrient con- centrations increased again. Protozooplankton reached a second maximum during September. With the Fluoroprobe small scale structures in the plankton community could be detected like a subsurface Cryptophyceae maximum near the thermocline tha

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