bio lect 39 - lecture 39 rivers driven by water flowing...

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lecture 39 rivers driven by water flowing downhill and biolohical distrobution. lakes - work on pfysical characteristics. water- is densists at 4 degrees Celsius. in winter- thermal stratification, ice cover on surface and 4degrees C on bottome. spring: when there is warming ,the mixing occurs (turnover) because teh 0 degree turns to 4 degrees. summer, the 4 degree water there is an upwelling that makes the water cyclle winter - stratifiction spring - mixing summer - stratification autumn - mixing lakes and pollution- oligotrophic lakes. low nut. levels. clear water. steep sided. low amnts of phytoplankton. eutrophic lakes - jigh nutrients, levels, turbid water. u shaped. high amnt of phytoplankton. high amounts of phytoplankton produced. oxygen sags - low levels of oxygen at night bcause of phytoplankton respiration in eastern North America. add P to oligotrophic lakesm nutrients increase making them eutrophic lakes. In western america, add N to get same effect.
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bio lect 39 - lecture 39 rivers driven by water flowing...

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