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Limnology: Study of Freshwater Systems

Limnology: Study of Freshwater Systems. New science, since 1850. Phytoplanktons dominate. Diatoms—1/4 of all plants, >70,000 spp. Macrophytes submerged emergent. Lake productivity:. Closed systems, nutrient sinks. CO 2 and O 2 from air and water. Autochthonous inputs.

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Limnology: Study of Freshwater Systems

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  1. Limnology: Study of Freshwater Systems • New science, since 1850 • Phytoplanktons dominate • Diatoms—1/4 of all plants, >70,000 spp. • Macrophytes • submerged • emergent

  2. Lake productivity: • Closed systems, nutrient sinks • CO2 and O2 from air and water • Autochthonous inputs • Allochthonous inputs

  3. OligotrophicEutrophic • Hypo > Epilimnion Hypo < Epilimnion < allochthonous > allochthonous < decay in benthic > decay in benthic O2 > depth O2 < depth • low productivity high productivity

  4. Lake factors: • Geography/topography • Nutrient sources • Size • Age

  5. Stream Ecology

  6. allochthonous > autochthonous allochthonous < autochthonous allochthonous > autochthonous Fig. 30.21 (EFB)

  7. Quiz • What are the three layers in a stratified lake that differ in temperature and density? • How do lakes mix and what is a dimictic, monomictic • and meromictic lake? • What are the main differences in oligotrophic versus • eutrophic lakes? • What are the most important features of lakes that • ultimately determine their productivity? • How do streams vary in productivity from source to • mouth?

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