Ecological adaptation in animals to aquatic environment, Biology

Assignment Help:

Ecological adaptation in animals to aquatic environment

In the aquatic environment animals are confronted with the problem of excess water. Freshwater and marine animals try to maintain water balance in quite different ways. On account of the difference in the osmotic pressure between body fluids of aquatic organisms and their surrounding fluids aquatic organisms have developed osmoregulatory mechanism to deal with this problem. The salt content to the body fluids in freshwater animals is relatively high as compared to the surrounding water medium. Hence, the water tends to diffuse continuously into the body. Extra water from the body needs to be removed frequently. Most aquatic animals (e.g. protozoans and fishes) excrete the extra amount of water from the body by osmoregulation. Protozoa employ contractile vacuoles and other multicellular invertebrates and chordates use excretory organs such as nephridia and kidney (Figure shown below).

2251_fish adaptations.jpg

In marine animals the situation is just the opposite. The concentration of salts in the body fluids is low as compared to the surrounding medium (i.e. hypotonic). Under these conditions the body tends to loose water. But through metabolic osmoregulation water is retained in the body and salt is excreted. Animals vary widely in their salinity tolerance. Organisms which have a narrow tolerance and cannot withstand salinity fluctuation are called stemhaline. Organisms which can survive under a wide range of salinity conditions are termed euryhaliie. Usually animals inhabiting cooler fresh water and marine environments tend to have large body size except in a few cases such as diatoms and sea urchins which have relatively larger sizes in warmer waters.

 


Related Discussions:- Ecological adaptation in animals to aquatic environment

Explain the structure of fungi, Explain the Structure of Fungi? The veg...

Explain the Structure of Fungi? The vegetative structure of a fungus is called thallus. It varies in complexity and size, ranging from unicellular yeasts to multicellular mould

Hypothermia-open heart surgery, Hypothermia :  Hypothermia reduces the met...

Hypothermia :  Hypothermia reduces the metabolic requirements of the body thereby reducing oxygen consumption. It also preserves high-energy phosphate stores of the body. At norma

What kind of eye defect can give rise to short-sightedness, What kind of ey...

What kind of eye defect can give rise to short-sightedness? Long eyeballs, large eyeballs, too powerful a lens or a combination of these defects can give increase to short-sigh

Animal nutrition, Briefly explain the following feeding mechanisms in holoz...

Briefly explain the following feeding mechanisms in holozoic organisms: filer feeding,fluid feeding and deposit feeding.

What are the homologous chromosomes, Q. What are the homologous chromosomes...

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

What is the utility of fungi for some industries, What is the utility of fu...

What is the utility of fungi for some industries? Fungi are industrially used in the production of fermented beverage, cheese, bread etc. Some fungi are very significant for th

Biting mechanism of snakes, i want to know the contents which i should writ...

i want to know the contents which i should write in my assignment..related to the above topic..

Compare and contrast covalent and ionic bonds, Compare and contrast covalen...

Compare and contrast covalent and ionic bonds in molecules, give an example of each.

Monocot and dicot plants, project formate for monocot and dicot plants in f...

project formate for monocot and dicot plants in feild per month

Briefly describe about caramelization, Briefly describe about Caramelizatio...

Briefly describe about Caramelization? Caramelization results from the action of heat on sugars at about 175º C. At high temperatures, sugars dehydrate, break down and polymeri

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