In Oligotrophic Marine Environments?

The essential elements of oligotrophic environments are low concentrations of mixed substrates and concomitant low cell concentrations of a highly diverse indigenous microbial community, which grows slowly with relatively low visible activity.

What are oligotrophic environments?

An oligotroph is an organism that can live in an environment that offers very low levels of nutrients. ... Oligotrophic environments are those that offer little to sustain life. These environments include deep oceanic sediments, caves, glacial and polar ice, deep subsurface soil, aquifers, ocean waters, and leached soils.

How do Ultramicrobacteria survive under oligotrophic conditions?

Ultramicrobacteria possess a relatively high surface-area-to-volume ratio due to their small size, which aids in growth under oligotrophic (i.e. nutrient-poor) conditions.