Estimated abundance and diversity of heterotrophic protists in South African biocrusts

  • Kenneth Dumack Biocenter Cologne, Faculty of Zoology, Department of Terrestrial Ecology, University of Cologne, Cologne, Germany
  • Robert Koller 1. Biocenter Cologne, Faculty of Zoology, Department of Terrestrial Ecology, University of Cologne, Cologne, Germany 2. Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany
  • Bettina Weber Multiphase Chemistry Department, Max Planck Institute for Chemistry, Max-PlanckGesellschaft, Mainz, Germany
  • Michael Bonkowsk Biocenter Cologne, Faculty of Zoology, Department of Terrestrial Ecology, University of Cologne, Cologne, Germany
Keywords: biological soil crusts, biodiversity, protozoa, cryptogams, cyanobacteria

Abstract

Biological soil crusts (biocrusts) occur widely in the uppermost millimeters of the soil in arid and semi-arid systems. Worldwide they cover large terrestrial areas and play a major role in the global terrestrial carbon and nitrogen cycles. However, knowledge of the microbial decomposer foodwebs within biocrusts is particularly scarce. Heterotrophic protists in soil are predominantly bacterivores, and because of their high biomass compared with other soil fauna and fast turnover rates, protists are considered an important factor for soil nutrient cycling and energy fluxes. Thus, knowledge of their biodiversity, abundance and functional roles is important to understand soil ecosystem functions. We investigated the diversity and abundance of heterotrophic soil protists in different types of biocrusts from the Succulent Karoo, South Africa. With an overall diversity of 23 distinct morphotypes, soil protist biodiversity was shown to be high. The most abundant groups were Spumella-like chrysomonads, gliding bodonids, glissomonads and heteroloboseans. Protist abundance was highly variable among samples. The abundance and diversity did not differ significantly among different types of biocrusts, indicating that microscale differences, but not macroscopic soil crust builders (e.g. cyanobacteria, lichens and bryophytes), have a major impact on the protist community.

Views
  • Abstract 125
  • PDF 133
  • EPUB 45
  • XML 57
Views and downloads are with effect from 11 January 2018
Published
2016-07-25