MIGRATORY GENE CANDIDATE. “We found a consistent association between a microsatellite polymorphism and migratory behaviour only at one candidate locus: the ADCYAP1 gene. This polymorphism explained about 2.6 per cent of the variation in migratory tendency among populations, and 2.7–3.5% of variation in migratory restlessness among individuals within two independent populations.”
http://rspb.royalsocietypublishing.org/content/early/2011/02/11/rspb.2010.2567