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!
Ecological isolation is based on the fact that population shows preference to one habitat over the other. This extensive forests become barriers to the dispersal of organims living in grasslands. The reverse that priaries being barriers to forest organisms is also true. The red tree mousephenocomys 1ongicaudu.s lives on fir needle trees and feeds on fir needle. It is understandable that for these mice not only priaries but the non-fir forests will also be a barrier for dispersal.
You may recall that in unit of this block we discussed extensively MacArthur's study of five species of warbler birds living in spruce trees. The five species of Dendroica are effectively isolated by ecological factors although they have a similar distribution. As a matter of fact, the ecological and food preference of the different species of warblers are very similar. Under such circumstances one would have expected a severe competition among them. But each species has carved a well defined niche and forages at a particular level in the trees. Differences in breeding dates and occupation of different habitats outside the breeding season are the contributing factors for the minimum competition and niche overlap among the species. There are other instances where potential mates keep away from each other because of their habitat preferences. In these cases there might even be a broad niche overlap and the individuals may exist in the same general area, but the distinctness of sub-species and species is maintained. Dice cited an example from United States where the two sub-species of mice Peromyscus maniculatus have overlapping niches and do not interbreed in nature, although there is interbreeding in the laboratory. Similarly another.study showed that the fresh water and salt water races of the water snake Natrix sipedon may come close together but may not interbreed because of their habitat preferences.
What is the virus that causes flu? Why doesn't the body create permanent immunity against that virus? How does the vaccine against flu work? Flu is a disease caused by the inf
What are some diseases caused by abnormal GH secretion by the hypophysis? In childhood deficient GH secretion might be lead to delayed growth and in severe cases to nanism (dwa
Q. Describe the effects of insulin on carbohydrate metabolism? Insulin promotes muscle glucose uptake and metabolism. In presence of insulin muscle cells take up glucose and us
Multicausal Nature of Cancer With several dividing cells in the organism and the various proto-oncogenes and tumor suppressor genes that can be changed to cause cancer. one m
Q. How are ecological interactions classified? Ecological interactions are classified as interspecific or intraspecific interactions and as harmonious or inharmonious interacti
Helix-turn-helix This motif have of two -helices divided by a short (four-amino acid) peptide sequence which forms a -turn that shown in above figure. When
Which is the plant tissue responsible for the filling of the space between other tissues? The plant-filling tissue is generically known as parenchyma. The plant parenchyma can
The metabolism of phenylalanine will now be taken in some detail, as two inborn errors of metabolism are known which affect this pathway. The Phenylalanine is 1st hydroxylated by p
Glutamine synthetase catalyzes the incorporation of ammonia into glutamine and deriving energy from the hydrolysis of ATP. This enzyme is named a synthetase and rather than a synth
What are gametes? Gametes are cells specialized in sexual reproduction. They have half of the maximum number of chromosomes of the species and unite with another gamete giving
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