Understanding the Biosphere: Lake Types and Eutrophication

Jan 20, 2026

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This lecture explores how topography, climate, and geological history influence the variety and distribution of organisms in lake ecosystems. It differentiates between oligotrophic lakes, which are deep, clear, and low in nutrients with modest productivity, and eutrophic lakes, characterized by shallowness, nutrient richness, and high primary productivity. Furthermore, the concept of eutrophication is examined as a process that enhances nutrient levels in water bodies, impacting ecological balance and health.

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Understanding the Biosphere: Lake Types and Eutrophication

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Lecture 14THE BIOSPHERE
Lakes • Topography, climate & geologic history dictate the numbers, kinds of organisms and their dispersion. • Based on this, conditions range from oligotrophy to eutrophy. • Oligotrophic lakes: • lakes often deep, clear, low in nutrients. • primary productivity isn’t great. • Eutrophic lakes • shallow, nutrient rich, high in primary productivity. Why? • Eutrophication – any process that enrich body of water with nutrients.