Effect on water bodies - dissolved oxygen (do), Biology

Effect on Water Bodies - Dissolved Oxygen (DO)

Most aquatic, organisms respire with oxygen dissolved in water. The quantity of dissolved oxygen in a unit volume of aerated water is only .0084g which is about one thirtieth of that present in the same volume of air at 25°C. The quantity decreases further with the increase of temperature. Hence the availability of oxygen is one of the critical factors for the survival of aquatic species. The amount of oxygen gas dissolved in a given quantity of water at a particular temperature and atmospheric pressure is referred to as DO and generally expressed as parts per million (ppm). DO in natural water is influenced by

  • The degree of aeration,
  • The photosynthetic activity in the water column,
  • The consumption of dissolved oxygen by plants, aquatic organisms and decomposers and
  • The ambient temperature.

Discharge of sewage in large quantities results in a drop in DO because decomposer organisms use up a lot of dissolved oxygen in decomposing organic matter. The water containing DO below 8 ppm is considered polluted. The gravely polluted water has DO below 4 ppm to nil. Volume and flow of water also affect biodegradation because consumed oxygen is rapidly renewed in large flowing water, whereas in stagnant water biodegradation is sharply reduced particularly in summer due to decrease in DO.

Posted Date: 1/21/2013 5:04:13 AM | Location : United States







Related Discussions:- Effect on water bodies - dissolved oxygen (do), Assignment Help, Ask Question on Effect on water bodies - dissolved oxygen (do), Get Answer, Expert's Help, Effect on water bodies - dissolved oxygen (do) Discussions

Write discussion on Effect on water bodies - dissolved oxygen (do)
Your posts are moderated
Related Questions
Q. What are the homologous chromosomes? Which are the human cells that do not have homologous chromosomes? Chromosomes contain genes genetic information in the form of nucleoti

Hom o sapiens neanderthalensis (NEANDERTHA L MAN) - Fossil discovered by C. Fuhlrott (1856) from Neander htat valley of Germany. This resembled modem man, cran

What do you understand by Exoskeleton. Supporting structures of skeleton not surrounded by the body. Endoskeletal elements are secreted by an underlying epidermis and one side

Light microscopy: Microscopy started with light microscopes using visible light to illuminate the objects, the most used and familiar microscope is called compound light micro

Q. What is the kind of digestive system present in beings of the phylum Arthropoda? Are these animals deuterostomes or protostomes? The digestive tube of arthropods is complete

The various types of white blood cells are sometime together referred to as: a) Erythrocytes (pron: eh-rith-row-cites) b) Erythroblasts (pron: eh-rith-rah-blast) c) Leuko


Light and Distribution We have mentioned in the beginning that the variation in the amount of light generally affects the global and local distribution of plants and animals. L

The Features of Retrograde Peri-Implantitis include: - Periapical Bone loss without gingival inflammation. - Microflora consisting mainly of streptococci and nonmotile organ

AMPHE T AMINE S - Commonly called pep pills or antisleep drugs. They increase physical & mental performance. Taken by truck drivers, student & night workers to keep