How does an oligotrophic lake primarily differ from a eutrophic lake?

An oligotrophic lake is characterized by its low nutrient levels, particularly phosphorus and nitrogen, which results in lower productivity—often referred to as primary productivity. This means that the amount of organic material generated through photosynthesis is lesser compared to a eutrophic lake, which is rich in nutrients and often experiences excessive growth of algae and aquatic plants. Consequently, oligotrophic lakes typically have clear water, higher dissolved oxygen levels, and support different types of fish and aquatic life that thrive in low nutrient conditions.

The lower productivity in oligotrophic lakes is fundamental to their ecological health, often resulting in a balanced ecosystem with a diverse range of species adapted to these conditions. The clarity of water in oligotrophic lakes is also more prominent due to the lack of suspended particles, which contrasts with eutrophic lakes where increased nutrient levels often lead to algal blooms that reduce water clarity.