Which of the following is NOT a characteristic of oligotrophic lakes?

Oligotrophic lakes are defined by their low nutrient levels, especially nitrogen and phosphorus, which correlates to low levels of productivity. This leads to clear water, as there are fewer algae and organic materials suspended in the water column. Such lakes often have a higher concentration of dissolved oxygen throughout the water column, promoting aquatic life that thrives in such conditions.

The characteristic of high nutrient levels is specifically associated with eutrophic lakes, which are rich in nutrients and typically exhibit higher biological productivity, resulting in murkier water due to algal blooms. In contrast, oligotrophic lakes are characterized by their clarity and lower biological productivity, consistent with their low nutrient concentrations. Cold temperatures can also be a feature of oligotrophic lakes, particularly in northern climates or at higher elevations, but it does not define them as much as their nutrient status does.