Distribution of chroococcoid cyanobacteria and size-fractionated chlorophyll a biomass in the central and southern North Sea waters during June/July 1989
Iriarte, A.; Purdie, D.A. (1993). Distribution of chroococcoid cyanobacteria and size-fractionated chlorophyll a biomass in the central and southern North Sea waters during June/July 1989. Neth. J. Sea Res. 31(1): 53-56
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, more
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| Abstract |
The spatial and vertical distribution of phycoerythrin(PE)-containing chroococcoid cyanobacteria and the contribution of the <3 µm size fraction to overall phytoplankton chlorophyll a biomass were investigated in the central and southern North Sea during June and July 1989. PE-containing chroococcoid cyanobacteria cell numbers ranged between 6x105 and 4.4x107 cells·dm-3 and was typically between 0.5x107 and 3x107 cells·dm-3, lowest numbers being recorded near the British coast in central North Sea waters. The vertical distribution of these cyanobacteria showed no evidence to suggest a preferential accumulation deep in the euphotic zone. The <3 µm size fraction accounted for 6.6 to 57.5% of the total phytoplankton chlorophyll a biomass (mean 19.7%). In general, the relative significance of the <3 µm size fraction decreased with increasing total chlorophyll a biomass. |
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