Hydrobiologia

, Volume 432, Issue 1–3, pp 65–72

Factors regulating summer phytoplankton in a highly eutrophic Antarctic lake

  • G. Mataloni
  • G. Tesolín
  • F. Sacullo
  • G. Tell
Article

Abstract

Lakes from Maritime Antarctica are regarded as systems generally inhabited by metazoan plankton capable of imposing a top-down control on the phytoplankton during short periods, while lakes from Continental Antarctica lacking these communities would be typically controlled by scarcity of nutrients, following a bottom-up model. Otero Lake is a highly eutrophic small lake located on the NW of the Antarctic Peninsula, which has no metazoan plankton. During summer 1996, we studied the density, composition and vertical distribution of the phytoplankton community of this lake with respect to various abiotic variables, yet our results demonstrated neither light nor nutrient limitation of the phytoplankton biomass. Densities of heterotrophic nanoflagellates (HNAN) and ciliates from three different size categories were also studied. Extremely low densities of HNAN (0–155 ind. ml−1) could be due to feeding competition by bacterivore nanociliates and/or predation by large ciliates. A summer bloom of the phytoflagellate Chlamydomonas aff. celerrima Pascher reached densities tenfold those of previous years (158.103 ind. ml−1), though apparently curtailed by a strong peak of large ciliates (107 ind. ml−1) which would heavily graze on PNAN (phototrophic nanoflagellates). Top-down control can thus occur in this lake during short periods of long hydrologic residence time.

Antarctica lakes phytoplankton ecology grazing 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Amblard, C., J.-F. Carrias, G. Bourdier &; N. Maurin, 1995. The microbial loop in a humic lake: Seasonal and vertical variations in the structure of the different communities. Hydrobiologia 300/301: 71–84.Google Scholar
  2. APHA-AWWA-WPCF, 1975. Standard Methods for the Examination of Water and Waste-water. American Public Health Association, Washington D.C.: 1193 pp.Google Scholar
  3. Ellis-Evans, J. C., 1996. Microbial diversity and function in Antarctic freshwater ecosystems. Biodiversity Conserv. 5: 1395–1431.Google Scholar
  4. Ellis Evans, J. C., J. Laybourn-Parry, P. Bayliss &; S. J. Perriss, 1997. Human impact on an oligotrophic lake in the Larsemann Hills. In: Proceedings of the Sixth SCAR Biology Symposium, Venice 1994.Google Scholar
  5. Fenchel, T., 1987. Ecology of protozoa: The biology of free-living phagotrophic protists. Science Tech Publishers. Madison, Wisconsin/Springer-Verlag, Berlin: 197 pp.Google Scholar
  6. Finlay, B. J. &; G. F. Esteban, 1998. Planktonic ciliate species diversity as an integral component of ecosystem function in a freshwater pond. Protist 149: 155–165.Google Scholar
  7. Hansson, L-A., 1992. The role of food chain composition and nutrient availability in shaping algal biomass development. Ecology 73 (1): 241–247.Google Scholar
  8. Hawes, I., 1983. Nutrients and their effects on phytoplankton populations in lakes of Signy Island, Antarctica. Polar Biol. 2: 115–126.Google Scholar
  9. Hawes, I., 1990. Eutrophication and vegetation development in Maritime Antarctic lakes. In Kerry, K. R. &; G. Hempel (eds), Antarctic Ecosystems: Ecological Change and Conservation. Springer, Berlin: 83–90.Google Scholar
  10. Izaguirre, I., G. Mataloni, A. Vinocur &; G. Tell, 1993. Temporal and spatial variations of phytoplankton from Boeckella Lake (Hope Bay, Antarctic Peninsula). Antarct. Sci. 5: 137–141.Google Scholar
  11. Izaguirre, I., A. Vinocur, G. Mataloni &; M. Pose, 1998. Comparison of phytoplankton communities in relation to trophic status in lakes from Hope Bay (Antarctic Peninsula). Hydrobiologia 369/370 (Dev. Hydrobiol. 129): 73–87.Google Scholar
  12. Laybourn-Parry, J., 1997. The microbial loop in Antarctic lakes. In Lyons, Howard-Williams &; Hawes (eds), Ecosystem Processes in Antarctic Ice-free Landscapes. Balkema, Rotterdam: 231–240.Google Scholar
  13. Laybourn-Parry, J., J. Cynan Ellis-Evans &; H. Butler, 1996. Microbial dynamics during the summer ice-loss phase in maritime Antarctic lakes. J. Plankton Res. 18(4): 495–511.Google Scholar
  14. Laybourn-Parry, J., M. R. James, D. M. McKnight, J. Priscu, S. Spaulding &; R Shiel, 1997. The microbial plankton of Lake Fryxell, southern Victoria Land, Antarctica, during the summers of 1992 and 1994. Polar Biol. 17: 54–61.Google Scholar
  15. Mackereth, J. F. H., J. Hiron &; J. F. Talling, 1978. Water analysis: some revised methods for limnologists. Freshw. Biol. Assoc., Scientific Publication No. 36: 117 pp.Google Scholar
  16. Mataloni, G. &; M. Pose, 2000. Non-marine algae from islands near Cierva Point, Antarctic Peninsula. Cryptogamie, Algologie. In press.Google Scholar
  17. Mataloni, G., G. Tell &; D. D. Wynn-Williams, 2000. Structure and diversity of soil algal communities from Cierva Point (Antarctic Peninsula). Polar Biol. 23: 205–211.Google Scholar
  18. Mataloni, G., G. Tesolín &; G. Tell, 1998. Characterization of a small eutrophic Antarctic lake (Otero Lake, Cierva Point) on the basis of algal assemblages and water chemistry. Polar Biol. 19: 107–114.Google Scholar
  19. Priddle, J., I. Hawes &; J. C. Ellis-Evans, 1986. Antarctic aquatic ecosystems as habitats for phytoplankton. Biol. Review 61: 199–238.Google Scholar
  20. Sorokin, Y. I., 1999. Aquatic Microbial Ecology. Backhuys Publishers, Leiden: 248 pp.Google Scholar
  21. Utermöhl, H., 1958. Zur vervollkommnung der quantitativen Phytoplankton Methodik. Mitt int. Ver. Limnol. 9: 1–38.Google Scholar
  22. Venrick, E. L., 1978. How many cells to count? In Von Sournia, A. (ed.), Phytoplankton Manual. Unesco, Paris: 167–180.Google Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • G. Mataloni
    • 1
  • G. Tesolín
    • 2
  • F. Sacullo
    • 2
  • G. Tell
    • 2
  1. 1.Depto. de Cs. Biológicas, Fac. de Cs. Exactas y NaturalesU.B.A.Buenos AiresArgentina
  2. 2.Depto. de Cs. Biológicas, Fac. de Cs. Exactas y Naturales -U.B.A.Buenos AiresArgentina

Personalised recommendations