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Investigating Oxygen Concentration in Lake St. George

In our study of Lake St. George, we discovered that warmer water can have a higher concentration of oxygen than colder water, contradicting common expectations. For example, at a water temperature of 17.3°C, we measured 13.15 ppm of oxygen concentration, while at 4.0°C, the concentration dropped to 3.82 ppm. Factors beyond temperature, such as the density of aquatic life, spring and autumn turnover, water depth, and rates of photosynthesis, also influence oxygen levels. Understanding these dynamics is crucial for comprehending lake ecosystems and fish distributions.

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Investigating Oxygen Concentration in Lake St. George

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  1. Lake Study Questions 7-9 By: Jesse, Nicole, Jess and Noor 

  2. In class we learned that colder water has a greater capacity to dissolve oxygen than warmer water. At Lake St. George did the coldest water always have the highest concentration of oxygen? • Not true • Warmer water had highest concentration of oxygen • The deeper we got, the less oxygen concentration there was • For example 17.3 degrees water temperature had 13.15 ppm of oxygen concentration, and water temperature at 4.0 had 3.82 ppm of oxygen concentration. • Colder water has less concentration of oxygen then warmer water at Lake St. George

  3. Explain what other factors (besides water temperature) may affect the concentration of oxygen in the various layers of the lake. • Population of animals and plants (organisms) • The more oxygen breathing organism (fish) the more oxygen itake • When the lake “turns over”, the high oxygen concentration of the upper layers of the lake goes to the bottom as the low oxygen concentration rises (it mixes) In Spring and Autumn • The depth of the lake • Rate of photosynthesis

  4. In which layers of the lake would you expect to find the most fish? Explain your reasoning. • The upper layers of the lake • There is more oxygen in the upper layers • The temperature is also warmer compared to the bottom • They are warm blooded • There is also more plants that could be used as food for the fish.

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