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Primary production, light and vertical mixing in Potter Cove, a shallow bay in the maritime Antarctic Schloss, I.R.; Ferreyra, G.A. (2002). Primary production, light and vertical mixing in Potter Cove, a shallow bay in the maritime Antarctic, in: Arntz, W.E. et al. (Ed.) Ecological studies in the Antarctic sea ice zone: results of EASIZ Midterm Symposium. pp. 117-124 In: Arntz, W.E.; Clarke, A. (Ed.) (2002). Ecological studies in the Antarctic sea ice zone: Results of EASIZ Midterm Symposium. Springer: Berlin. ISBN 3-540-43218-3. 277 pp. Is gerelateerd aan: Schloss, I.R.; Ferreyra, G.A. (2002). Primary production, light and vertical mixing in Potter Cove, a shallow bay in the maritime Antarctic. Polar Biol. 25(1): 41-48. dx.doi.org/10.1007/s003000100309, meer

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Trefwoorden

Attenuation > Light attenuation Biological production > Primary production Chemical reactions > Photochemical reactions > Photosynthesis Turbulence Water mixing > Vertical mixing Potter Cove [Marine Regions] Marien/Kust

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Auteurs		Top
Schloss, I.R. Ferreyra, G.A.

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Abstract

Phytoplankton photosynthesis was measured during spring-summer 1991-1992 in the inner and outer part of the shallow Potter Cove, King George Island. Strong winds characterise this area. Wind-induced turbulent mixing was quantified by means of the root-mean square expected vertical displacement depth of cells in the water column, Zt. The light attenuation coefficient was used as a measure of the influence of the large amount of terrigenous particles usually present in the water column; 1% light penetration ranged between 30 and 9 m, and between 30 and 15 m for the inner and outer cove, respectively. Obvious differences between photosynthetic capacity [P*max; averages 2.6 and 0.6 µg C (µg chlorophyll-a)-1h-1] and photosynthetic efficiency {α*; 0.073 and 0.0018 µg C (µg chlorophyll-a)-1h-1 [(µmol m-2 s-1)-1]} values were obtained for both sites during low mixing conditions (Zt from 10 to 20 m), while no differences were found for high mixing situations (Zt>20 m). This suggests different photoacclimation of phytoplankton responses, induced by modifications of the light field, which in turn are controlled by physical forcing. Our results suggest that although in experimental work P*max can be high, wind-induced mixing and low irradiance will prevent profuse phytoplankton development in the area.

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