Bird migration pathways, what influences bird migration

Categories: Science & Engineering.

Analysis: The reasons for bird migration are complex, and it is generally believed that this is an instinct of birds, which not only has genetic and physiological factors, but also is the result of long-term adaptation to external living conditions, and is closely related to changes in living conditions such as climate and food.

Migratory birds are sensitive to climate change, and as soon as the climate changes, they begin to migrate. In this way, it is possible to avoid the harsh cold of the northern winter and the scorching heat of the southern summer. Changes in the climate also have a direct impact on the food conditions of the birds.

The migration of birds is no easy feat. Usually after flying over a wide sea and tall mountains, they lose half their body weight, and a large number of young birds born that year die during or after reaching the end of the migration. The lack of time to forage for food on the way to migration, sudden storms, vast waters, etc., are devouring these creatures all the time.

At the same time, there is a danger in the early part of the migration, too early means that the living environment in the north is still covered in snow and ice, and too late it is in danger of storms, and there are countless human interferences: tall buildings, radio antennas, lighthouses and chimneys, collisions with airplanes, etc., all lurk in the long migration of birds.

Reasons for bird migration:

1. The migration of birds is an instinct, is an adaptive behavior of birds to the periodic changes of environmental factors, the seasonal change of climate, is the main reason for the migration of migratory birds, due to climate changes, in the cold winter in the north and the dry season in the tropics, there is often a shortage of food, thus forcing some individuals in the bird population to migrate to other areas with abundant food, this behavior is eventually fixed by the forces of natural selection, and becomes an instinct of birds.

2. Hail bridge migration brings many benefits to birds, mainly in the fact that birds always live in the most suitable climate, and have a rich variety of food ** to create the most suitable conditions for raising offspring, in the north can incubate the most large number of eggs, the season is long, there are abundant insects, the parent birds can have the opportunity to fully collect food, migration can greatly expand the activity space, conducive to breeding and competition for the occupation of the behavior.

Bird migrations are usually twice a year, in spring and autumn each year. Birds migrate from wintering grounds to nesting grounds in spring and from nesting grounds to wintering grounds in autumn, and migrate regularly and regularly over long distances between breeding areas and wintering areas along relatively fixed routes. The results of the current study suggest that many birds migrate seasonally.

Migration brings many benefits to birds, mainly in the following ways:

1. Make birds always live in the most suitable climate, and have a rich variety of food**, which is conducive to maintaining their strong metabolism;

2. Migration can also create the most suitable conditions for raising offspring, because raising offspring requires a lot of food;

3. In the north, the largest number of eggs can be hatched, the season is long, there are abundant insects, and the parent birds can have the opportunity to fully collect food;

4. There are fewer predators in the north, and the appearance of this annual fragile young black will not promote the formation of enemy populations;

5. Migration can greatly expand the activity space, which is conducive to reproduction and competition for occupied areas;

6. It is conducive to automatic balancing and can make the bird pass avoid climate disparity;

7. Migration provides opportunities for bird populations to spread to new distribution areas and for contact and mating between different individuals, so the spine sedan chair is also of great significance in evolution.