Transcription of Dissolved Oxygen and Temperature
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Dissolved Oxygen and Temperature
Lakes and ponds. In sunlight, aquatic plants and algaeproduce Oxygen within aquatic ecosystems through pho-tosynthesis. Turbulence and currents circulate DOthroughout Oxygen Fluctuates DailyThe DO concentration within a waterbody canexperience large daily fluctuations. Aquatic plants andalgae produce Oxygen as a by-product of photosynthesisby day. But at night, they consume Oxygen through res-piration. Productive lakes, lakes with large populationsof aquatic plants or algae, are likely to experience thegreatest DO fluctuations. In such lakes, the DO con-centration is usually lowest just before sunrise, and high-est in late afternoon (Caduto 1990). In some highly pro-ductive waterbodies, DO is consumed by night-time res-pirationfaster thanit is re-placed byoxygendiffusingfrom ,fish andother lakeorganisms may die from lack of Oxygen (Simpson 1991).
sure, lakes in higher altitudes usually have lower levels of DO. Groundwater, which does not have contact with the atmosphere, typically has lower levels of DO than surface waters. When groundwater enters a lake, DO concentrations are initially reduced near the spring (Caduto 1990). However, groundwater is generally colder than surface waters ...
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