Helgoländer Meeresuntersuchungen

, Volume 35, Issue 4, pp 501–515

Phagotrophy and development ofPaulsenella cf.chaetoceratis (Dinophyta), an ectoparasite of the diatomStreptotheca thamesis

  • G. Drebes
  • E. Schnepf
Article

Abstract

Zoospores of the dinophytePaulsenella cf.chaetoceratis, parasitizing the marine diatomStreptotheca thamesis, attach to the girdle region of the host and drive a peduncle into the cell interior. The peduncle consists of a non-cytoplasmic “crook”, a cytoplasmic feeding tube, and a presumably cellulosic sheath around the proximal part of the feeding tube. The crook seems to be used for attachment and penetration of the host. The mobile feeding tube induces shrinkage of the host vacuoles and takes up the complete host cytoplasm within less than 1 h. Phagocytosis depends on an intact host plasmalemma, which is not penetrated by the feeding tube. The trophic phase ends with retraction of the feeding tube. While the food is digested within a large vacuole, the trophont transforms into a thick-walled primary cyst. After about 12 h the primary cyst divides to form 3 or 4 secondary cysts. Finally, about 24 h after attacking the host, each secondary cyst releases two zoospores which may be again ready for infection within 1 h, without passing through any intermediate stage. The developmental times (above referred to 20 °C) are highly dependent on the temperature and can vary considerably, even between sister cells.

Literature cited

  1. Aleem, A. A., 1979. Marine microplankton from Sierra Leone (West Africa). — Indian J. mar. Sci.8 291–295.Google Scholar
  2. Cachon, J. & Cachon, M., 1971a.Protoodinium chattoni Hovasse. Manifestations ultrastructurales des rapports entre le péridinien et la méduse-hôte: fixation, phagocytose. — Arch. Protistenk.113 293–305.Google Scholar
  3. Cachon, J. & Cachon, M., 1971b. Ultrastructures du genreOodinium Chatton. Différenciations cellulaires en rapport avec la vie parasitaire. — Protistologica7 153–169.Google Scholar
  4. Cachon, J. & Cachon, M., 1973. LesApodinidae Chatton. Révision systématique. Rapports hôteparasite et métabolisme. — Protistologica9 17–33.Google Scholar
  5. Cachon, J., Cachon, M. & Bouquaheux, F., 1969.Myxodinium pipiens gen. nov., sp. nov., péridinien parasite d'Halosphaera. — Phycologia8 157–164.Google Scholar
  6. Cachon, M., Ferru, O. & Ferru, G., 1968. Cytologie et cycle évolutif desChytriodinium (Chatton). — Protistologica4 249–262.Google Scholar
  7. Chatton, E., 1920. Les péridiniens parasites. Morphologie, reproduction, éthologie. — Archs Zool. exp. gén.59 1–475.Google Scholar
  8. Drebes, G., 1974. Marines Phytoplankton. Thieme, Stuttgart, 186 pp.Google Scholar
  9. Drebes, G., 1978.Dissodinium pseudolunula (Dinophyta), a parasite on copepod eggs. — Br. phycol. J.13 319–327.Google Scholar
  10. Elbrächter, M. & Drebes, G., 1978. Life cycles, phylogeny and taxonomy ofDissodinium andPyrocystis (Dinophyta). — Helgoländer wiss. Meeresunters.31 347–366.Google Scholar
  11. Greuet, C. & Ferru, G., 1969. Etude morphologique et ultrastructurale du trophonte d'Erythropsis pavillardi Kofoid et Swezy. — Protistologica5, 481–503.Google Scholar
  12. Hendey, N. J., 1964. Bacillariophyceae. — Fish. Invest. (Ser. 4), London5, 1–317.Google Scholar
  13. Lee, R. E., 1977. Saprophytic and phagocytic isolates of the colourless heterotrophic dinoflagellateGyrodinium lebouriae Herdman. — J. mar. biol. Ass. U. K.57, 303–315.Google Scholar
  14. McLachlan, J., 1973. Growth media — marine. In: Handbook of phycological methods. Culture methods and growth measurements. Ed. by J. R. Stein. Cambridge Univ. Press, Cambridge, 25–51.Google Scholar
  15. Morey-Gaines, G. & Elbrächter, M., 1983. Heterotrophic nutrition. In: Biology of dinoflagellates. Ed. by F. J. R. Taylor. Blackwell, Oxford, (in press).Google Scholar
  16. Spero, H. J., 1982. Phagotrophy inGymnodinium fungiforme (Pyrrhophyta): The peduncle as an organelle of ingestion. — J. Phycol. (in press).Google Scholar
  17. Stosch, H. A. von, 1977. Observations onBellerochea andStreptotheca, including descriptions of three new planktonic diatom species. — Nova Hedwigia (Beih.)54, 113–166.Google Scholar

Copyright information

© Biologische Anstalt Helgoland 1982

Authors and Affiliations

  • G. Drebes
    • 1
  • E. Schnepf
    • 2
  1. 1.Biologische Anstalt Helgoland (Litoralstation)List/SyltFederal Republic of Germany
  2. 2.Lehrstuhl für ZellenlehreUniversität HeidelbergHeidelbergFederal Republic of Germany

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