Hydrobiologia

, Volume 165, Issue 1, pp 1–11 | Cite as

The ecology of photosynthetic bacteria in Burton Lake, Vestfold Hills, Antarctica

  • C. M. Burke
  • H. R. Burton
Article

Abstract

Photosynthetic bacteria in Burton Lake, a seasonally tidal, meromictic lake of maximum depth 18 m, located in the Vestfold Hills, Antarctica, were studied throughout 1983. The dominant species were Chlorobium vibrioforme and Chlorobium limicola (up to 5.4 × 106 cells ml−1) and minor species were Thiocapsa roseopersicina (< 1.25 × 105 cells ml−1) and Rhodopseudomonas palustris (< 100 cells ml−1). The Chlorobium spp. and T. roseopersicina were found throughout the anoxic water, which ranged in temperature from −0.5°C to −2.2°C, but did not form discrete layers at the O2−H2S interface. The growth zone, however, of the Chlorobium spp. was delineated by the presence of light and H2S and was restricted to less than 3 m below the O2−H2S interface. R. palustris was found in oxic and anoxic water. Available light, which varied from 0–4.9µE m−2 s−1 at the O2−H2S interface, was considered to be the major environmental factor controlling growth of the bacterial phototrophs. Growth was initiated in spring in low light levels (< 1 µE m−2 s−1) following 3 months of darkness during winter. It is concluded that the dominance of the Chlorobium spp. was a result of their more efficient maintenance metabolism in winter and of their greater efficiency in utilizing low intensity light.

Key words

photosynthetic bacteria meromictic Chlorobium Antarctica Burton Lake 

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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • C. M. Burke
    • 1
  • H. R. Burton
    • 2
  1. 1.Department of ZoologyUniversity of Western AustraliaNedlandsAustralia
  2. 2.Department of ScienceAntarctic DivisionKingstonAustralia

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