Distribution of chroococcoid cyanobacteria and size-fractionated chlorophyll a biomass in the central and southern north sea waters during June/July 1989 |
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| Affiliation: | 1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China;2. State Key Laboratory of Hydroscience & Engineering, Tsinghua University, Beijing 100084, China;3. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China;4. Sanya Institute of China Agricultural University, Sanya 572025, China;5. College of Water & Architectural Engineering, Shihezi University, Shihezi 832003, China |
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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 6×105 and 4.4×107 cells·dm−3 and was typically between 0.5×107 and 3×107 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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