Effects on aquatic organisms - water pollution, Biology

Effects on Aquatic Organisms - Water Pollution

Toxic water pollutants such as metals, pesticides, insecticides and chemicals affect aquatic species directly whereas the non-toxic organic load may eliminate some aquatic species indirectly by reducing the DO of water. The sensitive species such as Trout, and Bass that require high level of oxygen are eliminated first. With further decrease in DO, leeches, catfish and carp get killed and only the resistant species, for example, eel and hardy worms survive. Trout and salmon are excellent indicators of pollution. The aquatic flora of lakes and ponds is also affected by slight variations in sustaining elements, thus affecting the whole ecological system.

Generally plants and animals have the ability to wash out many poisons out of their system but certain chemicals such as pesticides, insecticides, methyl mercury tend to accumulate in the body. For example, DDT, an organochloride, does not dissolve in water but dissolves in fats, therefore, it accumulates in the organism for a long period. This is called bioaccumulation. These poisons then move in other organisms through food chain. For example, 0.02 ppm concentration of DDT in a lake entering into a bird through plankton (5 ppm), fish (400-300 ppm) may go up to 2000 ppm. Similarly, spray of DDT on soil (9.9 ppm) reaches 445 ppm in a Robin through plant (44 ppm). The increase in concentration of a toxin in food chain at higher level is called biomagnifications. Low levels of DO in water body expedite bioaccumulation because the rate of breathing of fish increases with decrease in DO. Hence it is forced to take in large amounts of water which may be polluted with toxic metals and chemicals. So their intake in fish would increase many fold than in the water body.

Posted Date: 1/21/2013 5:19:55 AM | Location : United States







Related Discussions:- Effects on aquatic organisms - water pollution, Assignment Help, Ask Question on Effects on aquatic organisms - water pollution, Get Answer, Expert's Help, Effects on aquatic organisms - water pollution Discussions

Write discussion on Effects on aquatic organisms - water pollution
Your posts are moderated
Related Questions
Structure-activity relationships Structure-activity relationships may be useful to increase the weight-of-evidence or human health hazards identification. Where classes of comp

The nature of the sounds produced by percussion (tapping) a patient's chest can tell a physician a great deal about the condition of the organs within the thoracic cavity. Healthy,

How are the symmetry and the nervous system characterized in echinoderms? Adult echinoderms, with cnidarians, are the animals that present radial symmetry, i.e., their body str

What is Mitochondria ? Mitochondria are the cellular organelles responsible for the conversion of energy into a form called ATP. ATP is a high energy chemical compound that cel

Do all vascular plants develop annual rings? Vascular plants are those, which have phloem and xylem structures within them to transport water and nutrients around the plant. Mo

Cori Cycle Skeletal muscles have some mitochondria, yet are competent of vigorous activity. as a output, the little stores of oxygen are rapidly depleted, causing the muscle ti

Explain about the Cyanocobalamin (vitamin B 12 )? Vitamin B 12 (cobalamin, cbl) is a unique vitamin in human nutrition, since its malabsorption leads to the fatal syndrome of

Explain what is Mustard Operation ? The difference in Mustard operation is that either pericardium or polyester patch is used for making the inter atrial baffle. The baffle com

There are three methods of collections: 1.      Kerbside collection: In this collection system the refuse is brought in containers and placed on the footway, from where it is

To study whether bacteria grow best where it is moist or dry Use 2 sterile dishes. Inoculate each one by touching a sterile transmit needle to a bacteria colony rowing in anoth