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Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia

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Summary

Data on phytoplankton and zooplankton biomass, and physical and chemical variables, are combined with a published multivariate description of diatom species composition to interpret variation within an area around South Georgia surveyed during an austral summer. Large-scale species distributions could be equated to the different water masses which reflected the interaction of the Antarctic Circumpolar Current with the island and the Scotia Ridge. Small-scale factors were found to act at an interstation scale and imposed local variation on the biogeographic pattern. Nutrient depletion could be related to phytoplankton biomass but no single inorganic nutrient of those measured (NO3−N, PO4−P and silica) could be identified as important. The ratio Si:P appeared to be more important as an ecological factor. The impact of grazing by krill and other zooplankton could only be resolved as differences in phytoplankton biomass and phaeopigment content. Diatom species composition showed a relation to local krill abundance very different from that suggested by published studies, but could be explained as the effect of earlier grazing outside the study area. The effects of vertical mixing could not account for interstation differences as pycnocline depth was uniformly greater than euphotic depth, and vertical stability very low. Some comparison was made with data collected in 1926–31 by the Discovery Investigations. Significant differences in the distribution of certain taxa such as Chaetoceros criophilum and C. socialis were traced to major differences in hydrology.

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Author notes

  1. E. Theriot

    Present address: Great Lakes Research Division, University of Michigan, 48109, Ann Arbor, MI, USA

Authors and Affiliations

  1. Natural Environment Research Council, British Antarctic Survey, High Cross, Madingley Road, CB3 0ET, Cambridge, UK

    J. Priddle & R. B. Heywood

  2. Department of Oceanography, Texas A&M University, 77843, College Station, TX, USA

    E. Theriot

Authors
  1. J. Priddle
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  2. R. B. Heywood
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  3. E. Theriot
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Priddle, J., Heywood, R.B. & Theriot, E. Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia. Polar Biol 5, 65–79 (1986). https://doi.org/10.1007/BF00443379

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