Migration direction in a songbird explained by two loci - Nature Communications

Genes decide the willow warbler's migrationroutes, finds study NatureComms

has significant implications for understanding ecological and evolutionary processes that maintain narrow migratory divides. The classical assumption that migratory divides are maintained through higher mortality of F1 hybrids that take an inferior migratory route needs to be reevaluated.Animals’ care was in accordance with institutional guidelines. Ethical permit was issued by Malmö-Lund djurförsöksetiska nämnd 5.8.18-00848/2018.

We deployed Migrate Technology Ltd geolocators and used a nylon string to mount them on birds with the “leg-loop” harness method as outlined in our previous workThe tagged birds were ringed with a numbered aluminum ring, and two, colored plastic rings for later identification in the field. In total, we tagged 466 males at breeding territories. During the first tagging season , birds were trapped at 17 locations distributed across Sweden .

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