Abstract
The unicellular eukaryotes are currently grouped in the kingdom Protista, together with their multicellular relatives. The inclusion of protozoa, algae and water moulds in a single taxon has resulted in nomenclatural problems, academic homelessness, and a reduction in their teaching. There are around 40 000 described protozoan protist species. Protozoa are principally grazers of bacteria, increasing mineralization and making nutrients more available to other organisms; most are aquatic, but they are also widespread animal parasites and symbionts. Their biomass, role in food chains, roles as mutualists and pathogens, and value as biomonitors are reviewed. To assess the role of protozoa in ecosystems more accurately, the current poor taxonomic standards in ecological work on protozoa must be improved. The manpower to respond to existing and new challenges in the field is declining as protozoology disappears from university courses and this problem needs to be addressed.
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References
Bak, R.P.M. and Nieuwland, G. (1989) Seasonal fluctuations in benthic protozoan populations at different depths in marine sediments.Neth. J. Sea Res. 24, 37–44.
Bamforth, S.S. (1985) The role of protozoa in litters and soils.J. Protozool. 32, 404–9.
Berninger, U.-G, Caron, D.A., Sanders, R.W. and Finlay, B.J. (1991) Heterotrophic flagellates of planktonic communities, their characteristics and methods of study. InThe Biology of Free-Living Heterotrophic Flagellates (D.J. Patterson, and J. Larsen, eds) pp. 39–56. (Systematics Association Special Vol. No. 45.) Oxford: Clarendon Press.
Bick, H. (1972)Ciliated Protozoa. Geneva: World Health Organization.
Buck, K.R., Chavez, F.P. and Thomsen, H.A. (1991) Choanoflagellates of the central Californian waters: abundance and distribution.Ophelia 33, 179–86.
Canning, E.U. (1982) An evaluation of protozoan characteristics in relation to biological control of pests.Parasitology 84, 119–49.
Caron, D.A. and Goldman, J.C. (1990) Nutrient regeneration by marine protozoa. InThe Ecology of Marine Protozoa (G.M. Capriulo, ed.) pp. 283–306. New York: Oxford University Press.
Cleveland, L.R. (1924) The physiology and symbiotic relationships between the intestinal protozoa of termites and their host, with special reference toReticulitermes flavipes Kollar.Biol. Bull. 46, 117–227.
Cole, J.J., Findlay, S. and Pace, M.L. (1988) Bacterial production in freshwater and saltwater ecosystems: a crop system overview.Mar. Ecol. Prog. Ser. 43, 1–10.
Corliss, J.O. (1984) The Kingdom Protista and its 45 phyla.BioSystems 17, 87–126.
Corliss, J.O. and Daggett, P.-M. (1983) ‘Paramecium aurelia’ and ‘Tetrahymena pyriformis’: current status of the taxonomy and nomenclature of these popularly known and widely-used ciliates.Protistologica 19, 307–22.
De Jonckheere, J.F. (1987) Characterization ofNaegleria species by restriction endonuclease digestion of whole-cell DNA.Mol. Biochem. Parasit. 24, 55–66.
Dollett, M. (1984) Plant diseases caused by flagellate protozoa.Ann. Rev. Plant Path. 22, 115–32.
Fenchel, T. (1986)The Ecology of Protozoa. Berlin: Madison/Springer Verlag.
Fenchel, T. and Finlay, B.J. (1983) Respiration rates in heterotrophic, free-living protozoa.Microb. Ecol. 9, 99–122.
Fenchel, T. and Finlay, B. J. (1989)Kentrophoros: a mouthless ciliate with a symbiotic kitchen garden.Ophelia 30, 75–93.
Fenchel, T. and Finlay, B.J. (1991) The biology of free-living anaerobic ciliates.Eur. J. Protistol. 26, 210–5.
Foissner, W. (1987) Soil protozoa: fundamental problems, ecological significance, adaptations in ciliates and testaceans, bioindicators and guide to the literature.Prog. Protistol. 2, 69–212.
Garfinkel, L.J., Giladi, M., Humber, M., Gitler, C., Mirelman, D., Evel, M. and Rozenblatt, S. (1989) DNA probes specific forEntamoeba histolytica possessing pathogenic and non-pathogenic zymodemes.Infect. Immun. 57, 926–31.
Graham, J.M. (1991) A brief history of aquatic microbial ecology.J. Protozool. 38, 66–9.
Grant, J. and Schwinghamer, P. (1987) Size partitioning of microbial and meiobenthic biomass and respiration on Brown's Bank, Southwest Nova Scotia.Estuar. Coast. Shelf Sci. 25, 647–61.
Kreier, J.P. (1977)Parasitic Protozoa. New York: Academic Press.
Margulis, L., Corliss, J.O., Melkonian, M. and Chapman, D.J., eds (1990)Handbook of Protoctista. Boston: Jones & Bartlett.
Martin, M.M. (1991) The evolution of cellulose digestion in insects.Phil. Trans. Royal Soc. London, Series B 333, 281–7.
Meyers, T.R. (1990) Diseases of Crustacea: diseases caused by protistans. InDiseases of Marine Animals (O. Kinne, ed.) vol. 3. pp. 330–68. Hamburg: Biologische Anstalt Helgland.
Patterson, D.J. and Larsen, J. (1991) (eds)The Biology of Free-living Heterotrophic Flagellates. (Systematics Association Special Vol. No. 45). Oxford: Clarendon Press.
Phillipson, J. (1983) Bioindicators, biological surveillance and monitoring.Verheit. Deut. Zool. Gesell. 198, 121–3.
Pomeroy, L.R. (1974) The ocean's food web; a changing paradigm.BioScience 24, 499–504.
Porter, K.G., Sherr, E.B., Sherr, B.F., Pace, M.L. and Sandars, R.W. (1985) Protozoa in planktonic food webs.J. Protozool. 32, 409–15.
Schlegel, M. (1991) Protist evolution and phylogeny as discerned from small subunit ribosomal RNA sequence comparisons.Eur. J. Protist. 27, 207–19.
Smetacek, V. (1981) The annual cycle of protozooplankton in the Kiel Bight.Mar. Biol. 63, 1–11.
Stevens, J.R. and Godfrey, D.G. (1992) Numerical taxonomy of Trypanozoon based on polymorphisms in a reduced range of enzymes.Parasitology 104, 75–86.
Stoecker, D.K., Michaels, A.E. and Davis, L.H. (1987) Large proportion of marine planktonic ciliates found to contain funtional chloroplasts.Nature 326, 790–2.
Tait, A. and Turner, C.M.R. (1990) Genetic exchange inTrypanosoma brucei.Parasit. Today 6, 70–5.
Tibayrenc, M. and Ayala, F.J. (1991) Towards a population genetics of microorganisms: the clonal theory of parasitic protozoa.Parasit. Today 7, 228–32.
Vickerman, K. (1986) Clandestine sex in trypanosomes.Nature 322, 113–4.
Vinogradova, N.G., Levenstein, R.Y. and Turpaeva, E.P. (1978) Quantitative distribution of bottom fauna in research field of 16th voyage of scientific research vessel ‘Dimitry Mendeleev’.Trudy Instituta Okeanologii 113, 7–21 (in Russian).
Williams, A.G. (1991) The biochemical activities and importance of the ciliate protozoa in the rumen ecosystem. InBiochemical Protozoology (G.H. Coombs and M.J. North, eds) pp. 61–79. London: Taylor & Francis.
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Vickerman, K. The diversity and ecological significance of Protozoa. Biodivers Conserv 1, 334–341 (1992). https://doi.org/10.1007/BF00693769
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DOI: https://doi.org/10.1007/BF00693769