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.
How does brain recognize difference between high and low c and soft and loud sounds?
Animals of Estuaries The animals of estuaries and related wetlands such as marshes and swamps are tremendously important not only as denizens of their environment but also for
What are the lateral meristems? Where can they be found and which kind of plant growth do they promote? The Lateral or the secondary, meristems, are the cambium and the phellog
Controlling Introduction of Alien Species As you know the alien species can cause the existing population to decrease or even become extinct. The individuals of alien species
Vitamins Micronutrients are as important as major nutrients for the animal body. Vitamins are organic compounds required in minute amounts to assist metabolic processes and for
Explain Trapezoidal Full Mucoperiosteal Flaps a) Similar to rectangular flap except: The 2 vertical incisions are at obtuse angle with the Horizontal incision, b) Mostly
Caseous lymphadenitis Caseous lymphadenitis is a chronic disease of sheep and goats. It is characterized by abscess formation in lymph nodes and sometimes in lungs and other organ
You have a neuron with a resting potential of -55 mV, EK of -70 mV, and ENa of 50 mV. You decide to voltage clamp the neuron. Now, draw the membrane current over time. What will th
Problem 1: Show the aims and applications of Epidemiology. Definition of Epidemiology. List aims of Epidemiology List applicationsof Epidemiology Problem 2
name of the excretory organ of a lizard
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