examples of interactions:

Host-microbe, Plant-microbe, microbe-microbe, and microbe-environment. Microbes can be categorized by many attributes based on: where they grow best, what they utilize for nutrients, how they look, if they colonize and how they colonize.

Host-microbe: Is the interaction of a organism that a microbe needs to utilize in order to thrive. This interaction can be parasitic, symbiotic, or communalistic. An example for a complex interaction with how Drosophila melanogaster (fruit flies) and Ganaspis sp. (parasitoid wasp) have a close relationship with one another is by how the fruit fly larvae utilize a food source that generates a competitive evolutionary relationship. While the parasitoid wasp would lay its larvae in the fruit fly larvae, the interaction between the fruit fly larvae and the Aspergillus n. for dead food made it possible so that the Drosophila larvaae would stump hyphae while Aspergillus would kill the larva by mycotoxins

Plant-microbe: This interaction can be viewed as a host-microbe interaction, however microbes help plant growth by adding nutrients to the soil and can also be harmful to bugs that prey on certain species of plants. 

Microbe-microbe: These interactions are rarely observed due to the microscopic scale of these interactions and also occur almost instantaneously. Certain deep-sea micro-organisms use electrons to raise their metabolic rates so they could consume methane gas from ocean floor vents with 80% efficiency. Additionally once the organisms were finished with methane-mitigation they transfer the electron to a sulfur-mitigating microbe.

Microbe-environment: Biogeography is a huge part in microbial ecology because of the variety of species there are.