Question for science olympiad?

Question

I'm doing ecology and I'm reviewing, just needed a little more information. In the lotic system (rivers and streams) what are the nutrient and oxygen contents, and temperature in different parts of the system. SO basically, which part(s) of a lake or stream would be the warmest, would have the most dissolved oxygen and would have the most nutrients. Your help would be MUCH appreciated.

Answer 1

I used to be in Science Olympiad. I might be able to help a little.

The temperatures of lakes and rivers are pretty consistant throughout the flow of water. There may be slight fluxes of temperature depending on where the water is coming from. So, for example, if the stream starts from a glacier melting in the spring, the water will initially be very cold. As it flows, lets say south, it will gain energy from the sun or just from its environment.

For the oxygen content, stream systems can gain and lose oxgen depending on its environment. It gains oxygen from the atmosphere and from plants as a result of photosynthesis. Running water, because of its churning, dissolves more oxygen than still water, such as that in a reservoir behind a dam. Respiration by aquatic animals, decomposition, and various chemical reactions consume oxygen. Basically, the content of oxygen is pretty consostant throughout the system, but with minor variences. Temperature affects oxygen content as well. I believe colder water can retain more oxygen than warm water. It has to do with molecular kinetics.

As far as nutrient content, it depends on a lot of factors. Decaying organic material such a fish and plants can increase nutrients. So still parts of a stream might contain higher organic decompisition, whereas it might contain less oxygen. So if a stream or river has extremly tight bends or maybe even oxbow lakes, there will be the most decomp material in the slower velocity part of the river, which is the inside. The outside of the turn has faster water velocity, which has a faster rate of nutrients because more substance flows through that sector of the river per unit of time.

So hopefully this might help a little.

Answer 2

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