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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.
Cover (area occupied) - Quantitative Characters Cover or specifically herbage cover refers primarily to the area of ground occupied by the leaves, stems and inflorescence i.e.
Q. Which animals make cutaneous respiration? Adult amphibians and Terrestrial annelids make cutaneous respiration in amphibians there is also pulmonary respiration, the thin sk
Define role of Zinc in controlling Gene Expression? Zinc atoms have specific structural roles in enzyme molecules, as well as, in many other proteins and in bio membranes. Thes
STRATEGY FOR ASSIGNMENT
Q. Illustrate Mitral Stenosis and Pregnancy ? Since mitral stenosis is often seen in young women, it is not uncommon to see young women with pregnancy complicated by mitral ste
Define Importance of Nutrient and Drug Interaction? Certain foods, beverages, alcohol, caffeine, and even cigarettes can interact with medicines. This may make them less effect
Explain the Lectins or Haemagglutinins? These are sugar binding proteins, having the ability to bind and agglutinate red blood cells (RBCs). You will find that they occur in mo
Why could a disease be more serious in a population with a low genetic diversity? A population with a low genetic diversity could be more expected to be wiped out by a disease
#sperm of reptilia
Omni Science Valve : This is another type of tilting disc valve available from 1978. The cage is made of titanium and disc out of pyrolitic carbon. There have been a
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