pied flycatchers: These birds fly 13,000 kilometers, yet somehow meet again in the same place
A European research team has offered remarkable insights into the long-distance migration of pied flycatchers, suggesting how both genetics and the environment shape where these small birds winter in Africa.
The study was published on: Sciencetracked birds from eight different countries across their breeding grounds and also conducted a rare cross-breeding experiment involving Dutch eggs raised by Swedish foster parents. The results suggest that migration points are not completely learned or random, but are influenced by a complex mix of inherited traits and early life conditions.
A journey of 13,000 km with exact meeting points
Billions of migratory birds travel from Europe and Asia to Africa every year. Weighing only around 12 grams, the pied flycatcher travels approximately 3,000 to 13,000 kilometers, depending on its breeding origin.
What makes this particularly striking is that birds from the same breeding population are consistently concentrated in the same African regions. For example, Dutch breeding birds often regroup in specific West African regions, while Spanish populations occupy different regions further west.
Tracking birds across continents
Researchers from several European institutions, coordinated by Koosje Lamers and Janne Ouwehand from the University of Groningen and supervised by Christiaan Both, tracked flycatchers on breeding grounds from Spain to Siberia with lightweight data loggers.
All populations followed a similar early route: They initially flew to Spain and Portugal in the autumn, stopped there briefly, and then continued a non-stop flight of about 40 hours across the Atlantic to West Africa.
After reaching West Africa, their path gradually shifted eastward in origin. Birds from Spain settled in West Africa, while Siberian birds moved further east, reaching places like Nigeria. Although Spanish birds travel about 3,000 km, Siberian birds travel almost 13,000 km due to this long detour through Western Europe.
Why is it necessary to take such a long detour?
Researchers were stunned by the seemingly inefficient route.
“It is remarkable that these pied flycatchers from Siberia take such a circuitous route,” said researcher Koosje Lamers, a Ph.
Interestingly, other related species, such as the collared flycatcher, already use this short route. This suggests that the pied flycatcher’s longer track may be an evolutionary remnant from past climate conditions, potentially dating back to the ice ages when their distribution was further west.
Genes, environment and migration behavior
A key part of the research involved an unusual experiment: Dutch eggs were placed in Sweden and raised by Swedish foster parents; Some adult Dutch birds were also relocated. The migration of both the original and cross-bred birds was then monitored.
The results showed clear differences:
- Non-translocated Dutch birds overwintered about 500 km further east than Swedish birds
- Dutch birds bred in Sweden migrated to intermediate areas between Dutch and Swedish populations
- Mixed origin offspring showed a slightly stronger bias towards wintering grounds in Sweden
As Lamers describes it, “Untranslocated Dutch flycatchers turned out to have moved about 500 kilometers further east in West Africa than their Swedish counterparts. And Dutch flycatchers growing in Sweden turned out to have moved to a position about half their normal Dutch and Swedish location.”
Effects of climate change
Understanding these migration mechanisms is becoming increasingly important in a changing climate. Changing temperatures and changing seasonal cycles can disrupt breeding timing, food availability, and migration schedules.
Because wintering location affects when birds can safely return north, even minor disruptions can affect reproduction and survival rates among populations.
The extraordinary journey of the pied flycatcher suggests that migration is not just a learned path or a fixed instinct, but a dynamic interaction between genes, environment and evolutionary history. Although these birds travel up to 13,000 kilometers between continents, they manage to regroup in certain parts of Africa, following invisible biological instructions that have been shaped over thousands of years. As scientists continue to unravel these patterns, the flycatcher is becoming a powerful model for understanding how migratory species may adapt or struggle in a rapidly changing world.
Source: PHYS ORG (phys.org)
FAQ:
Q1. What is the feature of pied flycatcher migration?
Pied flycatchers travel long distances between Europe and Africa every year. Despite this, they continually return to the same general wintering areas.
Q2. How far do these birds travel?
Depending on their breeding location, they travel between 3,000 and 13,000 kilometers. Some routes are among the longest known for small birds.
