| One such classification identifies two types of lakes: oligotrophic and eutrophic. |
| The centers of a raised bog consist of oligotrophic peat, the best quality fuel, not polluted by mineral substances such as clay or sand. |
| For males and females, much of the relationship was driven by the values for Lake Woodruff, the only oligotrophic lake. |
| In coastal marine waters, cyanobacteria are, conversely, responsible for most primary production in numerous oligotrophic environments. |
| Given the dearth of nutrients in their environment, these oligotrophic bacteria must generate their energy from a variety of sources. |
| This result is a paradox given the marked oligotrophic nature of the Mediterranean. |
