Parts of North America have witnessed the arrival of non-native birds during the spring season and they fly away and disappear after breeding. This is because they find food availability, temperature, and water availability suitable to raise their young ones. However, they know that these resources are limited over a particular time. So, they return to their native lands. Most birds breed in regions where there are plenty of insects that are present in the hospitable climate of Central America.
Migration at specific seasons occurs to increase the quality of reproductive output. It provides them with food resources and decreased competition from the wintering regions. Moreover, during the spring and summer seasons, there are longer periods of daylight; therefore they can gather food throughout the day.
Birds prepare themselves before migration. Behavioral and physiological changes take place to make their flight comfortable. Physiologically, they start to accumulate fat inside their body to serve as fuel during periods of flight. Behavioral changes involve changes in the activity rhythms and orientation in the direction of the flight that can mostly be observed in nocturnal birds.
Small birds usually are long-distance migrators and they travel at night. During the day, they feed and take rest. They fly non-stop without a break when they pass above oceans or unsuitable territory. For instance- Blackpoll Warblers, during the spring travel over the land. However, in the autumn, these birds travel above the ocean present in Canada and the United States until South America. Short-distance migrators usually prefer traveling during the daytime by spending a few hours for food. There are quite a few birds that are aerial foragers, which means they do not even stop for food and feed themselves as they fly.
Migration to different regions:
Migration to different regions entirely remains specific to different species. Arctic Tern is a bird present in extreme colder regions and it breeds in the zone of South America and travels from the Arctic for this purpose. However, Nutcracker migrates only a short distance to travel from the highly elevated breeding place in Sierras to low lying mountain ranges.
The majority of the male birds migrate far distances. However, in a relationship, if the females are dominant, then it would travel far distances toward the north. The concept of differential migration is explained by many hypotheses. One is based on the dominant relationship where the more dominant sex would travel a far distance. The second hypothesis involves the size of the body of the bird. It says that if the bird’s body is larger, it can tolerate extremely cold temperatures while traveling north. Smaller birds tend to travel towards the south. The third explanation involves competition for breeding resources. If one sex does not have enough breeding sources, the other sex makes an early return to breed. In this case, the birds make their breeding grounds nearby.
As birds possess various features and factors that determine the migration, all this hypothesis often becomes mutually exclusive. Many migratory birds are known to show an extreme level of fidelity to their breeding grounds, while some birds show loyalty to their wintering grounds. Scientists studied Yellow Warblers and found out that they were very loyal to their wintering grounds and they chose it accordingly as well. However, if they find the resources dwindling, then they change their wintering grounds to the desert region where they can find food. All these studies suggest that birds prepare themselves to adapt to any changing environmental conditions to complete their seasonal migration cycles.
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