Table of Contents

1 What is a Protozoan?.- 2 Ecological Physiology: Motility.- 3 Ecological Physiology: Feeding.- 4 Ecological Physiology: Bioenergetics.- 5 Ecological Physiology: Other Aspects.- 6 Symbiosis.- 7 The Niches of Protozoa.- 8 Protozoan Communities: Marine Habitats.- 9 Protozoan Communities: Freshwater Habitats.- 10 Protozoan Communities: Terrestrial Habitats.- 11 Symbiotic Protozoa.- 12 Concluding Remarks.- References.