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Home NEWS Science News

Routes of migratory birds follow today’s peaks in resources

Bioengineer by Bioengineer
January 4, 2017
in Science News
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Credit: Science Advances

Movement of migratory birds is closely linked to seasonal availability of resources. The birds locate the areas with the most resources across continents. Researchers from Center for Macroecology, Evolution and Climate, University of Copenhagen, have tracked three long-distance migratory birds. By comparing the bird's migration routes to climate projections, the scientists show that finding food may become a challenge to the birds by the end of this century.

Migratory birds need to schedule their annual trips properly in order to reach areas with sufficient food resources during wintering.

A new paper published today in Science Advances, shows that common cuckoos, red-backed shrikes and thrush nightingale are able to closely follow the complex seasonal vegetation changes occurring within their non-breeding grounds in sub-Saharan Africa. Bird Migration researcher and first-author Professor Kasper Thorup from Center for Macroecology, Evolution and Climate, University of Copenhagen, says,

– We show that all three birds cross continents to match highest levels of resource supply. The bird's migration-program guides them to areas where food availability has been high in the past. So, what is interesting now is the bird's ability to adjust their migration pattern to match future changes in food availability.

In total 38 individual birds were tracked to establish the migration routes. The common cuckoo was tracked using satellite tracking, while the smaller red-backed shrikes and trust nightingale were tracked using light loggers, Kasper Thorup, explains,

– All three species have complex migration routes covering large parts of Europe and Africa with many stops along their way. Mapping their routes has only been possible using the newest available technology from satellite telemetry in cuckoos to small tags that log light-levels in red-backed shrikes and thrush nightingales.

The study shows that the migration pattern in cuckoos matched high levels of green vegetation whereas it matched local vegetation peaks for red-backed and nightingales. Both green vegetation and vegetation peaks are presumably related to abundant food availability.

The scientist compared the observed migration route to projections of food availability for 2080. This showed a mismatch between seasonal resources and the birds expected presence. Co-author Professor Carsten Rahbek from Center for Macroecology, Evolution and Climate, elaborates,

– We believe that bird's innate programme to guide them over long distances, must be adapted to long-term average of food availability. Our results suggest that by the end of this century climate change, and other impacts on the food source, like land use changes, could negatively influence the birds' chances to find sufficient food.

###

@Kasper_Thorup
@macroecology
@Carsten_Rahbek

Media Contact

Kasper Thorup
[email protected]
45-24-94-25-74

http://www.science.ku.dk/english/

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Story Source: Materials provided by Scienmag

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