What type of diversity is represented by all the types of microorganisms in a pond?

Aquatic, freshwater species biodiversity is represented by all the types of microorganisms in a pond.

Explanation:

A pond ecosystem represents an aquatic or freshwater ecosystem and hence will exhibit diverse range of freshwater inhabitants. Based on the type and number of species it hosts, the biodiversity increases in a pond. The presence of biotic and abiotic components in the pond decides the level of biodiversity in the pond. Microorganisms present in ponds plays an major role in the pond's productivity, water quality, nutrient cycling, effluent management, etc. The microorganisms will be specially adapted to survive the aquatic conditions in and surrounding the pond.