Summary
Chlorophyll a, phytoplankton species composition and carbon (PPC) estimated from cell-counts, were monitored together with hydrographic parameters and nutrients in the upper 50 m of Balsfjord (ca. 70° N), northern Norway between 08 February and 29 June 1982. Sediment traps were placed at 10, 50, 100, and 170 m (10 m above bottom) for intervals of 5–20 days during the study period. Trap contents were analyzed for phytoplankton as above; dry weight, particulate organic material (POM), particulate organic nitrogen and carbon (PON and POC), ash, and particulate phosphorus were also measured. The phytoplankton community exhibited three main phases: During the first (02–15 April, chiefly surface biomass) and the second (20 April–10 May, deep biomass-maximum and spring bloom peak) periods, Phaeocystis pouchetii dominated biomass (ca. 50% of PPC) followed by vegetative cells of Chaetoceros socialis. In the third period (10 May onwards, characterized by surface estuarinecir-culation), dino- and microflagellates dominated the low post-bloom biomass. Protozooplankton comprising tintinnids, other ciliates and heterotrophic dinoflagellates increased in abundance. Vegetative cells of phytoplankton were scarce in trap collections at 50 m or below; resting cells of Chaetoceros comprised nearly all the “intact” sedimenting phytoplankton. Krill faeces accounted for >90% by volume of the total faecal material trapped, despite a >2∶1 biomass dominance of copepods in the fjord. The greatest sedimentation rates of krill faeces were at > 100 m, reflecting the downward migration of krill during the day. In all, 2–3 g Cm−2 of krill faeces were collected, representing ca. twice that from intact phytoplankton cells. POC in the traps at ≥50 m was ca. 11 gm−2, accounting for ca. 17% of the estimated primary production during the study period. As the secondary production is high, a large proportion of the production of P. pouchetii must be grazed by herbivores. Copepod faeces are probably remineralized in the euphotic zone, while those of krill provide the major coupling between the pelagial and the benthos. The implications of such a sedimentation model for partitioning energy flow between the pelagial and the benthos is discussed.
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Lutter, S., Taasen, J.P., Hopkins, C.C.E. et al. Phytoplankton dynamics and sedimentation processes during spring and summer in Balsfjord, Northern Norway. Polar Biol 10, 113–124 (1989). https://doi.org/10.1007/BF00239156
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DOI: https://doi.org/10.1007/BF00239156