CS29 Phytoplankton & Primary Production
Date: Monday, June 10, 2002
Time: 4:15:00 PM
Location: Oak Bay
 
McQuoidMR, Goteborg University, Goteborg, Sweden, melissa.mcquoid@marbot.gu.se
 
PELAGIC AND BENTHIC ENVIRONMENTAL CONTROLS ON THE SPATIAL DISTRIBUTION OF A VIABLE DIATOM PROPAGULE BANK ON THE SWEDISH WEST COAST
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The distribution of viable diatom resting stages on the Swedish west coast was assessed by the most probable number (MPN) culture technique. Multivariate analyses correlated benthic and pelagic environmental factors to the observed spatial variations in bank size and taxonomic composition. The propagule bank was plentiful and dominated by the genera Skeletonema, Detonula, Chaetoceros, and Thalassiosira. The diatom bank was largest in the Orust-Tjorn fjord system. Species composition in this fjord system was dominated by D. confervacea in contrast to stations on the outer coast. These taxonomic variations were principally influenced by deep water oxygen concentrations and water column stability. Skeletonema was abundant all along the coast but showed reduced viability in low oxygen environments. Calculations based on MPN values estimate that resuspension of sediment could provide a sizable inoculum to the plankton. While benthic resting stages may not be absolutely necessary for survival of all diatoms, these cells may be important in determining species cycles, succession, and the spatial distribution of diatoms.