Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Population Regulation
The number of individuals in a natural population varies with time. If the size of a population declines too drastically due to some reason, it may become extinct, but may later be re-established by immigration from other populations. On the other hand, increase in size of a population is not infinite since the carrying capacity of the environment always imposes a restriction upon it. In spite of such fluctuations, however, an outstanding feature of most large populations is that their average size changes relatively little over the years and certainly less than is expected from their biotic potentials. This indicates that population sizes are regulated in such a way that small population grow fast, larger populations grow more slowly and still larger populations decline.
Let us see what brings about such ecological homeostasis. In low-diversity, physically stressed ecosystems or in those subjected to irregular or unpredictable external perturbations, populations tend to be regulated by physical components such as weather, water, chemical limiting factors, pollution etc. In high diversity ecosystems, or in those which are not physically stressed, populations tend to be biologically controlled. In all ecosystems there is a strong tendency for all populations to evolve through natural selection towards self-regulation such as failure of reproduction and self-inflicted mortality. Even though this is difficult to achieve under external stress. It is because over-population is not in best interests of any population. Thus it can be said that limitation of number in any population is brought about by the action and interaction of two basic regulatory processes namely density dependent and density independent factors. We will discuss these processes in the following subsections.
J-shape d - It shows 2 phases - (i) Lay phase (ii) Exponential phase
What is the phenomenon of apical dominance in plants? How can it be artificially eliminated? Apical dominance is the phenomenon by which high (over the positive range limit) au
What is Abscess and Gingival Biotype Abscess: Rule out any presence of Periapical or /and Periodontal abscess Gingival Biotype: Thickness of the gingival is an important
Mammals - Regeneration in Vertebrates Mammals are not capable of regenerating limb or tails. However, there are a few exceptions where lost tissues are regenerated. The annual
Explain the Procedure for Preparation of Culture Media? Now carry out the exercise following the steps given herewith: 1. To prepare potato dextrose medium, first, peel off
Slight or no Metamorphosis In primitive wingless insects (Apterygota) such as spring tails, silver fish etc. and in secondarily apterous insects the young ones which hatch fr
-The expected phenotypic ratio of offspring. -The expected genotypic ratio of offspring. -Calculate the expected values you would use on a chi-square test (use genotypic rati
Explain Basic Concepts of Nutrition Science? Food is the very basis of our life, the food we eat, though the process of digestion, we know, is converted into nutrients, and the
Self Help Group: The first and perhaps the most influential of substance abuse rehabilitation is Self Help Group. The self help programme was founded in 1935 by two men, Dr. B
Reality Theory Developed in the 1960s by Willian glasser, a psychiatrist, reality therapists view human nature in terms of behaviour. They believe that human behaviour i
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd