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.
Explain transposition with VSD with restricted pulmonary? Transposition of great arteries with VSD with restricted pulmonary blood flow: Restriction to pulmonary blood flow
Q. What is the homeostasis? What are the sensors, effectors and controllers of homeostasis? Homeostasis comprises the processes by which the organism maintains extracellular an
project formate for monocot and dicot plants in feild per month
Food Pyramid The diabetes food pyramid divides food into six groups. These groups vary with each other on the basis of size occupied in the pyramid. The largest i.e. grains, br
Q. What is Chemical disinfection? Chemicals are added to waste to kill or inactivate the pathogens it contains, this treatment usually results in disinfection rather than steri
Two parents who are each known to be carriers of an autosomal recessive alleles have four children. None of the children has the recessive condition. What is the probability that o
Nature: Matter and Energy Nature is not just our immediate surrounding or environment, but is the whole Universe of Cosmos. Study of the origin and topography of cosmos is ca
How has the position of the stomata changed in some plants to prevent excessive water loss by transpiration? In the some plants that have leaves that receive too much sunlight
Match each item in Column A with the corresponding item in Column B regarding infectious diseases Column A Column B a. Pulmonary tuberculosis i. Enteric infectious protozoan diseas
Intramuscular Route of Injection Purpose When rapid action is required. When drug would prove irritating to the subcutaneous tissue. Site selected must be whe
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