Advertisement

Loricate choanoflagellates of the Southern Ocean with new observations on cell division in Bicosta spinifera (Throndsen, 1970) from Antarctica and Saroeca attenuata Thomsen, 1979, from the Baltic Sea

  • Helge Abildhauge Thomsen
  • Jacob Larsen
Conference paper

Summary

The loricate choanoflagellate Bicosta spinifera was observed frequently in Antarctic samples collected along Scotia/Weddell Sea transects. The entire population showed a conspicuous bimodal size distribution. Large forms were predominant in Scotia Sea samples, while only small specimens were found in the Confluence area. Prior to cell division Bicosta spinifera produces a complete set of costal strips in a temporary “tail” -like protrusion. Small specimens sometimes possess a “tail” similar to that found in large specimens. The fact that B. spinifera may increase considerably in size following cell division, in connection with the finding of aberrant minute forms, have prompted us to hypothesize a polymorphic life history in B. spinifera. The term “caudiform” division is introduced to describe division in B. spinifera. Saroeca attenuata also produces a “tail” prior to cell division, but is otherwise shown to undergo a mixed caudiform/tectiform type of division.

Keywords

Large Specimen Small Specimen Heterotrophic Flagellate Posterior Spine Anterior Projection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Björnsen P, Kuparinen J (1989) Experiments with the microbial food web. Ber Polarforsch 65:117–122Google Scholar
  2. Buck KR (1981) A study of choanoflagellates (Acanthoecidae) from the Weddell Sea, including a description of Diaphanoeca multiannulata n. sp. J Protozool 28:47–54Google Scholar
  3. Buck KR (1989) Phylum zoomastigina class choanomastigotes (Choanoflagellates). In: Margulis L, Corliss JO, Melkonian M, Chapman DJ (eds) Handbook of protoctista. Jones and Bartlett Publ, Boston, pp 194–199Google Scholar
  4. Buck KR, Garrison DL (1983) Protists from the ice-edge region of the Weddell Sea. Deep-Sea-Res 30:1261–1277CrossRefGoogle Scholar
  5. Buck KR, Garrison DL (1988) Distribution and abundance of choanoflagellates (Acanthoecidae) across the ice-edge zone in the Weddell Sea, Antarctica. Mar Biol 98:263–269CrossRefGoogle Scholar
  6. Buma A, Estrada M, Larsen J, Riebesell U, Schloss I, Thomsen HA (1989) Unicellular organisms studied alive using photographic and video techniques. Ber Polarforsch 65:102–110Google Scholar
  7. Eckernkemper M, Jacques G, Panouse M, (1989) Phytoplankton-size fractionation. Ber Polarforsch 65:68–76Google Scholar
  8. Fenchel T (1982) Ecology of heterotrophic microflagellates. III. Adaptations to heterogenous environments. Mar Ecol Prog Ser 9:25–33CrossRefGoogle Scholar
  9. Franeker JA van (1989) Sea ice conditions. Ber Polarforsch 65:10–14Google Scholar
  10. Hara S, Takahashi E (1987) An investigation with electron microscope of marine choanoflagellates (Protozoa: Choanoflagellida) from Osaka Bay, Japan. I. Reinvestigation of Bicosta spinifera, B. minor and Crucispina cruciformis. Bull Plankton Soc Jpn 34: 1–13Google Scholar
  11. Leadbeater BSC (1979a) Developmental studies on the loricate choanoflagellate Stephanoeca diplocostata Ellis. I. Ultrastructure of the non-dividing cell and costal strip production. Protoplasma 98:241–262CrossRefGoogle Scholar
  12. Leadbeater BSC (1979b) Developmental studies on the loricate choanoflagellate Stephanoeca diplocostata Ellis. IL Cell division and lorica assembly. Protoplasma 98:311–328CrossRefGoogle Scholar
  13. Leadbeater BSC (1991) Choanoflagellate organization with special reference to loricate taxa. In: Patterson DJ, Larsen J (eds) Free-living heterotrophic flagellates. Clarendon Press, Oxford, pp 241–258Google Scholar
  14. Manton I, Bremer G (1981) Observations on lorica structure and aspects of replication in the Pleurasiga reynoldsii Thomsen complex ( = Polyfibula spp., gen. n.) (Choanoflagellata). Zool Scr 10:273–291CrossRefGoogle Scholar
  15. Manton I, Sutherland J, Oates K (1980) A reinvestigation of collared flagellates in the genus Bicosta Leadbeater with special reference to correlations with climate. Philos Trans R Soc London, Ser B 290:431–447CrossRefGoogle Scholar
  16. Marchant HJ (1985) Choanoflagellates in the Antarctic marine food chain. In: Siegfried WR, Condy PR, Laws RM (eds) Antarctic nutrient cycles and food webs. Springer, Berlin, pp 271–276Google Scholar
  17. Moestrup ø (1979) Identification by electron microscopy of marine nanoplankton from New Zealand, including the description of four new species. NZJ Bot 17:61–95Google Scholar
  18. Moestrup ø, Thomsen HA (1980) Preparation of shadowcast whole mounts. In: Gantt E (ed) Handbook of phycological methods. Cambridge University press, Cambridge, pp 385–390Google Scholar
  19. Reynolds N (1976) Observations on Salpingoeca spinifera Throndsen and S. minor sp. nov. (Craspedophyceae). Br Phycol J 11:13–17CrossRefGoogle Scholar
  20. Takahashi E (1981) Loricate and scale-bearing protists from Lüt-zow-Holm Bay, Antarctica. 1. Species of the Acanthoecidae and the Centrohelida found at a site selected on the fast ice. Antarc Rec 73:1–22Google Scholar
  21. Thomsen HA (1979) Electron microscopical observations on brackish-water nannoplankton from the Tvärminne area, SW coast of Finland. Acta Bot Fenn 110:11–37Google Scholar
  22. Thomsen HA (1982) Planktonic choanoflagellates from Disko Bugt, West Greenland, with a survey of the marine nanoplankton of the area. Medd Groenl, Biosci 8:1–35Google Scholar
  23. Thomsen HA, Buck KR (1991) Choanoflagellate diversity with particular emphasis on the Acanthoecidae. :In Patterson DJ, Larsen J (eds) Free-living heterotrophic flagellates. Clarendon Press, Oxford, pp. 259–284Google Scholar
  24. Thomsen HA, Buck KR, Coale SL, Garrison DL, Gowing MM (1990) Loricate choanoflagellates (Acanthoecidae, Choanoflagellida) from the Weddell Sea, Antarctica. Zool Scr 19: 367–387CrossRefGoogle Scholar
  25. Throndsen J (1970) Salpingoeca spinifera sp. nov., a new planktonic species of the Craspedophyceae recorded in the Arctic. Br Phycol J 5:87–89CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Helge Abildhauge Thomsen
    • 1
  • Jacob Larsen
    • 1
  1. 1.Institute for SporeplanterUniyersity of CopenhagenCopenhagen KDenmark

Personalised recommendations