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

Assignment Help:

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.


Related Discussions:- Effect on water bodies - dissolved oxygen (do)

Define Stolon - Types of hyphae, Define Stolon - Types of Hyphae? Mic...

Define Stolon - Types of Hyphae? Microscopically, hyphae are aseptate and coenocytic. There are 3 kinds of hyphae: (a) Stolon - These grow horizontally on substratum surfa

Osmotic strength of the fluids, Osmotic Strength of the Fluids in Immediate...

Osmotic Strength of the Fluids in Immediate Surrounding The availability of soluble mineral salts varies widely from habitat to habitat. In fact, a big chunk of land in our

What are all possibilities of genotypes and phenotypes, What are all possib...

What are all possibilities of genotypes and phenotypes formed in the combination of alleles responsible for the production of factor VIII? Considering the alleles X and Xh, whe

Respiration, difference between the respiration occurs in lower and higher ...

difference between the respiration occurs in lower and higher organisms

Protozoa, what is phylum protozoa

what is phylum protozoa

Awareness for diabetes mellitus, Q. Awareness for diabetes mellitus? Aw...

Q. Awareness for diabetes mellitus? Awareness should be generated in the community to prevent the diabetes mellitus, since we know prevention is better then cure. Use behav

What are the uses of formycin b, What are the uses of formycin B? Formy...

What are the uses of formycin B? Formycin B is a drug used to demolish of intestinal parasites.

Sds page, describe sds page for the proteins

describe sds page for the proteins

Life processes, why the small intestine is longer in herbivores as comparis...

why the small intestine is longer in herbivores as comparison to carnivores animals

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd