At 45 - 65 ft, divers can find small schools
of blackcap basslets close to or under the overhangs.
Not exact matches
So the scientists caught
blackcaps when the birds returned to Germany in the spring and sequenced short stretches
of their genomes called microsatellites.
Whether
blackcaps will eventually diverge into different species depends on the fitness
of offspring from crosses between northwest - and southwest - migrating birds, says evolutionary biologist Darren Irwin
of the University
of British Columbia, Vancouver, in Canada.
They trapped birds from 14 populations
of the European
blackcap (Sylvia atricapilla, pictured), a warbler that spends summer in...