Migration - population dispersal, Biology

Migration - Population Dispersal

Dispersal is affected by the presence or absence of the barrier and vagility which means inherent power of movement also called dispersal powers. Many plants and lesser form of animals have greater dispersal power, although we all know that birds and insects are much known for their ability to move around.

Migration is a special type of population dispersal process often involving the mass movement of entire population. It occurs only in motile organisms and is best developed in arthropods and vertebrates like certain fishes, birds and mammals. Due to seasonal and diurnal migrations the organisms are able to occupy the regions which would be otherwise inhabitable during unfavourable conditions. In most cases migration of population may occur for food, shelter or reproduction and various ecological hazards such as temperature fluctuation, predation etc. Non-migratory populations in such unfavourable periods assume some form of dormancy or undergo considerable reduction in number, for example, frogs hibernate during winter season.

Posted Date: 1/21/2013 1:10:59 AM | Location : United States

Related Discussions:- Migration - population dispersal, Assignment Help, Ask Question on Migration - population dispersal, Get Answer, Expert's Help, Migration - population dispersal Discussions

Write discussion on Migration - population dispersal
Your posts are moderated
Related Questions
List the goals of targeting blood pressure in diabetics. Goals of targeting blood pressure in diabetics are:  Patients with diabetes should be treated to a systolic blood pr

Explain about the Micronutrient Deficiencies? Micronutrient deficiencies are more common during calamities. Can you guess, why? This is due to the lack of diversified food item

Chromosomes Karl Nageli and Hofmeister observed chromosomes in pollen mother cells of Tradescantia. Chromosome name proposed by Waldeyer. During cell division,

Swine-pox Pigs of 2 months of age may be infected with vaccinia either naturally or artificially and show pox lesions on the eyelids, snot, inside the thigh and undersurface of th

Define prevention of idd - Double Fortified salt? iron deficiency anaemia and iodine deficiency disorders often co-exist, the most effective approach to control these public he

Define Nutritional Management of Food Allergies and Food Intolerance? The term "hypersensitivity" is general and may include true allergies, reactions that do not affect the im


I have 30µg of a primer, whose molecular weight is 600. How much water should I add to get a stock primer concentration of 100µM?

Draw decanol, plamitic acid (C16:0 fatty acid) and the resulting wax ester generated by a dehydration reaction between both molecules.

Define Physical activity as a factor for obesity? Sedentary life style with lack of an exercise schedule tends to make one obese. As we approach middle age, our physical activi