Typically, birds trace their migration routes based on where they can get the most resources. However, a study from the University of Copenhagen concludes that climate change could cause birds to migrate at the wrong time.
To understand what drives the birds’ migration routes, the scientists tracked the movements of three species: the common cuckoo, the red-backed shrike and the red nightingale. Thus, the researchers discovered that birds tend to move to areas that have a greater supply of food (especially insects) at certain times of the year. They also take into account the vegetation, since they tend to prefer greenish places.
However, as research suggests, birds may have trouble doing this. In fact, it is estimated that climate change will modify vegetation patterns and the food supply in various parts of the planet, causing birds to not be able to find enough food along their migratory route.
Different investigations
According to Kasper Thorup, a researcher at the University of Copenhagen, birds expect migration areas to be green when they arrive because for hundreds of years it has been. However, due to the climate crisis these areas may not be as green in the future.
On the other hand, an analysis prepared by the researchers indicated that birds make long trips guided by their innate knowledge of the availability of resources. But, at the end of this century, changes in land use (among other factors) may prevent birds from finding enough food.
However, this study is the first step to understand how birds migrate, which is essential to be able to protect them. For this reason, the priority of the researchers, as they have argued, will be to identify the critical points or relevant areas on which the birds depend during long trips.
