Phytoplankton Pigments in Baltic Sea Seston and Sediments: Seasonal Variability, Fluxes, and Transformations

摘要: Abstract We studied the temporal variability in composition of plant pigments water-column particulate matter and surface sediments, with specific emphasis on bloom events. The pigment concentration sinking suspended particles was used to evaluate pre- post-depositional decomposition bloom-derived phytodetritus Baltic proper. Water, sediment, sediment trap samples were collected 1994 at a long-term coastal monitoring station fine sediments water depth 36 m, situated near Asko Laboratory north-western part Sea Annual phytoplankton succession showed an early spring dominated by diatoms, followed dinoflagellates late summer. Later summer, this dinoflagellate community gradually replaced filamentous, nitrogen-fixing cyanobacterial bloom; summer-early autumn characterized diatoms. highest chlorophyll  flux occurred during peak diatom conditions, which resulted concentrations sediments. Assuming that all May derived from current bloom, it estimated approximately half (48%) decomposed two months. total phaeopigment/chlorophyll  ratios (an index amount decay), found column (PM) occasional high-energy winter periods. latter higher likely due wind-induced resuspension into materials. settling rate indicated rapid sedimentation diatoms slow bloom. In unicellular cyanobacteria, including picocyanobacteria, appeared have rates than filamentous seemed decompose largely column. Thus, study demonstrated useful biomarkers taxonomic blooms their subsequent Sea.