What do you understand by the term migration

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Hint: Migration can be compared with emigration that involves a change in location not of necessity followed by a return journey that is invasion or interruption. Both of them involve the appearance and succeeding disappearance of great numbers of animals at irregular times and locations. Complete Answer: - Migration is generally an annual event in which many animals travel to far-off places in search of food and breeding ground when climatic changes take place in their natural habitat. Many birds from Siberia come to India during winter months during the climate change in search of their food. - The migration cycle is frequently annual and therefore strongly linked with the cyclic pattern of the seasons. The migration of most birds and mammals and a lot of the fishes are on a yearly cycle. In many cases animals with a comparatively long life span return back to their place of birth in order to reproduce and ultimately die. In other situations as in definite invertebrates where the animal has a relatively short life span and reproduces rapidly. Migrations will not occur in every generation. - The daily actions of certain fishes and invertebrates have also been called migrations because of their regular incidence. This type of movement though it is not to be mystified with migration in the strict sense. Hence the correct answer is option C. Note: Migratory animals are fundamental components of the ecosystems that support all life on Earth. By performing the function as poll...

Migration refers to the movement of a group of animals from one region to another, usually seasonally. It is found in all major animal groups, including birds, mammals, fish, reptiles, amphibians, insects, and crustaceans. It is done by the species itself to find better and favorable habitat or by human authorities to locate animals or birds to better and safe habitat for breeding. Categories • • (31.9k) • (8.8k) • (764k) • (261k) • (257k) • (218k) • (248k) • (2.9k) • (5.2k) • (664) • (121k) • (72.1k) • (3.8k) • (19.6k) • (1.4k) • (14.2k) • (12.5k) • (9.3k) • (7.7k) • (3.9k) • (6.7k) • (63.8k) • (26.6k) • (23.7k) • (14.6k) • (25.7k) • (530) • (84) • (765) • (49.1k) • (63.8k) • (1.8k) • (59.3k) • (24.5k)

Defining migration (especially internal migration) is a controversial activity. At one end of the spectrum migration is defined as the movement of people over some distance (or at least from one "migration-defining area" to another) and from one "usual place of residence" to another. At the other end of the spectrum the definition of migration discards the requirements that migration must involve a change of residence and a move across some distance. In this article a compromise between these two positions is suggested. Migration is defined here as the crossing of the boundary of a predefined spatial unit by one or more persons involved in a change of residence. The implications of this definition for the use of recent South African migration data are discussed. It is concluded that the data from Census '96 are comprehensive and expected to be inherently sound, despite a definition problem caused by the absence of predetermined "migration-defining areas". The expected impact of this problem is assessed, and a partial compensation is suggested on the basis of findings from a national sample survey.

There are more than 250 million migrants today, representing the highest number since World War II, and possibly ever. Migrants leave their homes for diverse reasons. They may be • seeking better jobs and access to better health care; • running from famine, war, or natural disasters; or • fleeing persecution and looking for political and religious freedoms they do not enjoy at home. Often, a combination of these factors pushes people to leave and pulls them toward their new homes. The United Nations’ landmark 1951 Convention and the 1967 Protocol Relating to the Status of Why migration matters Though migration is not a new phenomenon, it takes on a new significance in an increasingly interconnected world. Understanding what migration is—who migrates, where they come from, and where they settle—and what causes migration—both the crises and the opportunities—can affect our understanding of critical issues such as As the number of migrants continues to grow for various reasons, it is important to understand how migration shapes the world socially, economically, and politically—and, in turn, how countries shape immigration policy in response. In this module, we will • learn about the different classifications of migrants, and why these distinctions matter; • see where migrants come from, where they go, and what makes current migration patterns unique; • understand migration’s effects on a country that sends a significant portion of its population abroad; • examine the ways in ...