Which of the following is a characteristic of oligotrophic lakes?

• A. Murky water.
• B. Dense vegetation.
• C. Summer turnover.
• D. Relatively low biomass & primary productivity.

Answer: (D)

Verified step by step guidance

1. Understand the term 'oligotrophic': Oligotrophic lakes are bodies of water that have low nutrient concentrations, which leads to low primary productivity.
2. Identify the characteristics of oligotrophic lakes: These lakes typically have clear water, low algal production, and are often found in mountainous regions or areas with little human impact.
3. Contrast with eutrophic lakes: Eutrophic lakes have high nutrient levels, leading to high primary productivity and often murky water due to dense algal blooms.
4. Consider the options given: Murky water and dense vegetation are characteristics of eutrophic lakes, not oligotrophic lakes.
5. Recognize the correct characteristic: Oligotrophic lakes are known for having relatively low biomass and primary productivity, which aligns with the definition and characteristics of oligotrophic lakes.