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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 does vacuoles do? It is an organelle, located in the cell's cytoplasm, which is the site of protein synthesis. It is really a protein having of 2 parts. These 2 "parts"
Name few polymers in the eukoratic cell? Name the mummers that make up the DNA? Compare and contrast between mummers of DNA VS monomers of RNA?
State the similarity between Shigella and Salmonella There are many points of similarity between Shigella and Salmonella. They dwell primarily in the gastrointestinal tract, wi
How sugar play a major role in preservation? In so many products, sugars play a major role in preservation. The addition of monosaccharides, like glucose or fructose, to jams a
What are the genotypes and respective blood types of the ABO system? Ever since the alleles are IA, IB and i the possible genotypes are IAIA (blood type A), IAIB (blood type AB
Two major objectives must be achieved to treat IE effectively. The infecting micro-organism in the vegetation must be eradicated. Also, invasive, destructive intracardiac and foca
What are the chemical elements that form most of living biological matter? The elements are:- a) oxygen (O), b) carbon (C), c) hydrogen (H) and d) Nitrogen (N).
what is the excretory organ of a lizard?
Biological fixation - Nitrogen Fixation Approximately 63% of all nitrogen fixed is through biological fixation. Nitrogen fixing organisms are primarily prokaryotes; bacteria a
Atrial Arrhythmias : Atlial fibrillation is the most common rhythm abnormality after CABG. Paroxysmal atrial tachycardia and atrial flutter are less common. Increased sympat
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