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Spring migration has officially begun. Millions of birds take to the skies, traveling vast distances to reach their breeding grounds. However, the world they are returning to is changing rapidly. Rising temperatures and shifting seasons are forcing birds to adjust their schedules. They must decide when to leave and how to navigate a warming climate. This adjustment is difficult, especially for species that rely on precise timing to survive.
Morgan Tingley is a professor of ecology and evolutionary biology at the University of California, Los Angeles. He studies the specific effects of climate change on bird populations. His research highlights the growing disconnect between birds and the environments they depend on. The Conversation collaborated with SciLine to share highlights from Tingley’s discussion. The following insights explain why earlier springs are creating a crisis for many species.
Morgan Tingley explains that spring migration is a complex journey. Birds travel north across the United States to reach areas where they will spend their spring and summer months. Their primary goal is to arrive at their breeding grounds at a very specific time. They need to build nests and lay eggs when food is most abundant. In nature, this peak food supply usually occurs in early summer. It is often provided by insects or plants that bloom at that exact moment.
Climate change is disrupting this delicate balance. Springs are starting earlier each year due to rising global temperatures. This shift creates a serious problem for migrating birds. Many birds are arriving at their breeding grounds too late. They are falling behind the local pace of spring. Consequently, they miss the peak window of food availability. By the time they arrive, the insects they need to feed their chicks may have already disappeared.
Not all birds face this problem with the same intensity. About seventy percent of the bird species found in the United States are migratory. The difficulty they face depends heavily on how far they travel. Some species migrate short distances, perhaps only fifty to one hundred miles. Others travel from the southernmost tip of South America to breed in Canada.