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Answered 2009-03-02 03:23:10

Organisms in streams need oxygen to live when lacking dissolved oxygen it will kill these organisms. edit: unless the organisms in the stream are photosynthetic, in which case they will increase the oxygen levels. however, by far, most organisms in a stream are not photosynthetic and oxygenation occurs solely through aeration and surface area dissolving from the air. so, to answer the question, organisms (most organisms which aren't plant-based photosynthetic organisms) decrease the amount of oxygen in a stream. edit: a flowing stream has turbulence which helps aerate the water, increasing dissolved oxygen. In contrast, stagnant water tends to be low in dissolved oxygen, except near the surface. Multicellular animals (like fish) need a good supply of dissolved oxygen to thrive.


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oxygen dissolved in water and used by marine organisms

From the air or if they live underwater- from dissolved oxygen in the water.

The colder the water, the more DO (dissolved oxygen) it can contain.

The higher the salinity, the lower the dissolved oxygen concentrations.

Other factors must have caused the low dissolved oxygen levels. Bacteria and other organisms can lower the dissolved oxygen of water when they respire aerobically.

Dissolve oxygen is when oxygen is dissolved and oxygen is just normal oxygen!

dissolved oxygen is dissolved oxygen

The oxygen dissolved in water is a measure of dissolved oxygen (DO).

The chemical oxygen demand refers to the amount of dissolved oxygen needed by aerobic biological organisms in a body of water.

The main dissolved gases found in the ocean include, but are not limited to: carbon dioxide, oxygen, and hydrogen. Dissolved gases, especially oxygen, are important, since it provides dissolved oxygen for aquatic organisms to "breathe" in. Also, the carbon dioxide dissolved in the ocean helps lessen the amount of carbon dioxide in the environment.

the bigger the pressure is, the more oxygen dissolves

Most Marine organisms require oxygen to survive. Most do not need to breathe air to do so as there is oxygen dissolved in water that can be absorbed.There are a few organism, the smallest ones, that are anaerobic and do not require oxygen. Other than single cell organisms. they are rare.

One of the biggest effects of pollutants on dissolved oxygen is that some pollutants are nutrients for organisms that consume (or occasionally produce) oxygen. If the organisms are well fed, they can consume nearly all of the dissolved oxygen. Some pollutants will also chemically react with the oxygen to remove it from the water as well, but this is usually a much lesser effect. These two phenomena are measured as BOD (biological oxygen demand) and COD (chemical oxygen demand. See the attached links for more information on BOD and COD.

Water can be depleted of it's oxygen by a number of different ways. Short of putting the water in a vacuum and "sucking" the dissolved oxygen out, oxygen-breathing organisms such as fish take oxygen from the water through respiration, for example. It is unlikely a large body of water to become completely deoxygenated due to the presence of photosynthetic aquatic organisms (plants) and the fact that oxygen is also dissolved in the water at the water's surface.

Oxygen is dissolved in water but any reaction occur.

The only gas that most organisms need is oxygen. In most water, there is some dissolved oxygen. Organisms that live get their oxygen from water (such as fish, crabs, squid, etc) either have special organs called gills for extracting the oxygen from the water, or they simply absorb it through their skin.

Well, dissolved oxygen impacts water quality because if the level of the dissolved oxygen is too low then organisms can die. _________________________________________________________________ That is okay, but I want to what dissolved oxygen tests for. ------ For the water quality are tested: - total oxygen demand (TOD) - biochemical oxygen demand (BOD) - chemical oxygen demand (COD) - sometimes, carbonaceous biochemical oxygen demand (CBOD) For details about the analytical procedures I recommend you to read a book or a collection of analytical methods for water, searching in a library or searching on the Internet.

Dissolved oxygen is the current amount of oxygen in the water. A certain amount of Dissolved Oxygen Is needed to keep the fish alive, if any of the dissolved oxygen decreases by either a little or a lot it can cause changes in the water, normally if the dissolved oxygen decreases so do the fish and aquatics life's life.

Dissolved Oxygen is the bubbles in water when you splash there's bubbles in the water that is Dissolved Oxygen.

Large quantities of oxygen are dissolved in water and make up a large percentage of air. Organisms extract it from these media. The ultimate source of molecular oxygen in the air and water appears to be as a byproduct of photosynthesis in plants and some single-celled organisms.

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