Dissolved Oxygen (DO)
The oxygen freely available in water. Dissolved oxygen is vital to fish and other aquatic life.
(DO): Amount of oxygen gas dissolved in a given quantity of water at a given temperature and atmospheric pressure. It is usually expressed as a concentration in parts per million or as a percentage of saturation.
Dissolved Oxygen (DO): oxygen dissolved in water and readily available to fish and other aquatic organisms.
Amount of oxygen dissolved in a given volume of water at a given temperature and atmospheric pressure; usually expressed in parts per million (ppm).
diversity (species diversity, biological diversity) ...
dissolved oxygen (do) The amount of dissolved oxygen, in mg/L, present in water.
dissolved solids A dispersion by very small, nonsettling molecules not removed by filtration practices as defined by the method of measurement.
(DO). Measure of water quality indicating
free oxygen dissolved in water.
distillate (DIS-tuh-late). In the distillation of a sample, a ...
Dissolved Oxygen (DO)
The oxygen freely available in water, vital to fish and other aquatic life and for the prevention of odors. DO levels are considered a very important indicator of a water body's ability to support desirable aquatic life.
The amount of oxygen dissolved in water at a certain time, expressed in ppm mg/L.
Dissolved solids ...
D dissolved oxygen
Definition (english only)
Amount of gaseous oxygen (O2) actually present in water expressed in terms either of its presence in the volume of water (milligrams of O2 per litre) or of its share in saturated water (percentage).
: Oxygen dissolved in water. The amount depends on temperature of the water, plant photosynthesis, plant and animal respiration, and physical aeration caused by tumbling. Measured in parts per million (mg/L).
dissolved oxygen (DO) content
Amount of oxygen gas (O2) dissolved in a given volume of water at a particular temperature and pressure, often expressed as a concentration in parts of oxygen per million parts of water. See biological oxygen demand.
(DO) The amount of molecular oxygen dissolved in water.
Dump An illegal and uncontrolled area where wastes have been placed on or in the ground. See Landfill.
Dissolved Oxygen (DO)
Oxygen that is freely available in water to sustain the lives of fish and other aquatic organisms. ...
Amount of needed by aerobic decomposers to break down the organic materials in a given volume of water at a certain temperature over a specified time period. See BOD5.
The amount of dissolved oxygen consumed in five days by biological processes breaking down organic matter.
Source: Terms of the Environment
Water levels of about 9 parts per million (ppm) are needed to support most fish and 4.5 ppm is the minimum for life support.
dissolved oxygen (DO) oxygen dissolved in water
dissolved substances substances that have become chemically combined with a liquid such that the two can no longer be distinguished. Dissolved substances will not settle out of solution.
Algal blooms reduce the amount of in lakes and rivers and can result in fish kills. ambient air Any unconfined portion of the atmosphere; the outside air.
It is very likely that the dissolved oxygen content of the ocean will decrease by 3 to 6% during the 21st century in response to surface warming (see Box 6.5, and Section 6.4.5).
Hydrogen peroxide is used to increase the content of groundwater to stimulate aerobic biodegradation of organic contaminants.
hypoxia - the depletion of dissolved oxygen in water, a condition resulting from an overabundance of nutrients of human or natural origin that stimulates the growth of algae, ...
Anoxic waters are regions of sea water or fresh water that are depleted of . This condition is mostly found in regions that have confined water exchange. Anoxic waters are a natural phenomenon.
Hypoxia/Hypoxic Waters: Waters with dissolved oxygen concentrations of less than 2 ppm, the level generally accepted as the minimum required for most marine life to survive and reproduce.
In this condition, the soil is free of . Gley (bluey-grey) colours are often an indication of prolonged saturation.
Simple rootless plants that grow in sunlit waters in proportion to the amount of available nutrients. They can affect water quality adversely by lowering the dissolved oxygen in the water. They are food for fish and small aquatic animals.
The amount of oxygen required by aerobic biological processes to break down the organic matter in water. BOD is a measure of the pollutional strength of biodegradeable waste on in water.
lakes, estuaries, or slow-moving streams receive excess nutrients that stimulate excessive plant growth (algae, periphyton attached algae, and nuisance plants weeds). This enhanced plant growth, often called an algal bloom, reduces dissolved oxygen ...
Reaeration: mechanical augmentation of in water, as in cresting waves or below waterfalls.
Realized Niche: the part of a niche actually occupied by a species. Contrast with Fundamental Niche.
Technologies like fish ladders help salmon go up over dams and enter upstream spawning areas, but the presence of hydroelectric dams changes their migration patterns and hurts fish populations. Hydropower plants can also cause low dissolved oxygen ...
See also: Oxygen, Water, Air, Environment, Organic