How Protozoa Obtain Energy

  • Johanna Laybourn-Parry
Part of the A Functional Biology of Free-Living Protozoa book series (FBS)


Protozoa have been classified into three trophic categories: the photoautotrophs which harness the sun’s radiant energy in the process of photosynthesis; the photoheterotrophs, which although phototrophic in energy requirements, are unable to use carbon dioxide for cell synthesis and must have organic carbon compounds; and lastly the chemoheterotrophs which require chemical energy and organic carbon sources (Nisbet, 1984). The latter group, which are more commonly referred to as heterotrophs, include the majority of Protozoa, while the first two trophic categories are largely restricted to members of the Phytomastigophorea.


Capture Rate Prey Density Buccal Cavity Food Vacuole Food Organism 
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Copyright information

© Johanna Laybourn-Parry 1984

Authors and Affiliations

  • Johanna Laybourn-Parry
    • 1
  1. 1.Department of Biological SciencesUniversity of LancasterLancasterUK

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