BIO 2129 Lecture 6: Ecology Topic 6
3 Nov 2015
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Physical properties of aquatic and marine ecosystems: trophic status, factors that vary within a particular lake, factors that vary within marine ecosystems. Density of water: temperature, salinity, vertical stratification. Most common causes of variation in lake trophic status: substrate (a natural cause, human activities a. Water use (usually point source: soluble substrates here show areas where run-off through natural vegetation has eroded sedimentary rock. Run- off waters here are relatively nutrient rich, compared with granitic environments. (near. Dunedin, new zealand: soluble substrates here are granitic and relatively insoluble. Run-off (i. e. streams flowing into this lake) are nutrient-poor. (la mauricie np, canada) Factors that vary within a lake: temperature and thermal stratification. Temperature and density: ice floats on liquid water! T e m p e r a t u r e (oc) Chemistry/taters/solubility. htm http://www. sciencegeek. net: solubility of: o2 vs. various salts, o2 solubility increases at low temperatures, while salt solubility decreases at low temperatures.
