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.
Genetic Defects in DNA repair and human disease: 1. Xeroderma pigmentosum is an inherited disease that is characterized by severe photosensitivity and a very high incidence of
Explain the Techniques of cardian examination? Examiner should use the fingertips or the part just proximal to them for palpation. The chest should be completely exposed and el
parazoz????
MAJOR EVENTS DURING GASTRULATION - 1. There is rearrangement of cells due to morphogenetic movement of the cells of blastoderm. 2. The three primary germ layer g
Q. Write the definition of communication? Communication is "a process of transmitting ideas, information, attitudes (images which we have formulated for ourselves) by the use o
Examine the differences between DNA and RNA. Explain why DNA is the most favorable molecule for genetic material and how RNA compares to it in this respect.
Q. What do you meant by Diabetic Ketoacidosis? Diabetic Ketoacidosis (DKA) is one of the acute complications of diabetes mellitus. The name itself implies that there is acidosi
Which parts of the eye refract ('bend') the light in such a way as to form an image on the retina? The curved surface of the cornea, and the aqueous humour enclosed by it,
Q. What is the numeric relation between purine and pyrimidine bases in the DNA molecule? Is that relation valid in the RNA molecules? The DNA molecule is made of two bound poly
Role of Dietitian in Health Care The role of the dietitian has come a long way since the early 1900s. Their role is still unknown to a lot of people. Some think that dietitian
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