Aquatic life: selection under extreme conditions

The modules address the following topics:

  • Richness of habitat types: e.g. lakes, small ponds, streams, lake sediments, and glacial cryoconite holes.
  • Special habitats: Iron, sulfur and high carbonate springs, and meromictic lakes.
  • Conditions for life: Seasonal and diurnal rhythms of harsh and variable conditions, low temperature, freezing and thawing, desiccation, variable water mass flow during snow melt. High PAR and extreme UV-radiation after snow melt, long dark periods below snow and ice, anaerobiosis under the snow pack.
  • Life processes: Adapted for low temperature, low electrolyte, low nutrient, high radiation conditions.
Unit 20 Navigation Chart
Wind Introduction Conclusions Human impact Longitudinal and seasonal patterns Learning objectives Start Ecological determinants Reflection and transmission Energy budget Radiation Lake mixing High mountain lakes and ponds Fluctuating ponds, Confin Toxic glacial pond, Tambo Meromictic Lago Cadagno Alpine streams Review test


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29 August 2011
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