Genome sequencing shows climate barrier to spread of Africanized bees

Source: Science Daily

Since the 1950s, ‘Africanized’ honeybees have spread north and south across the Americas until apparently coming to a halt in California and northern Argentina. Now genome sequencing of hundreds of bees from the northern and southern limits shows a gradual decline in African ancestry across hundreds of miles, rather than an abrupt shift.

https://www.sciencedaily.com/releases/2020/10/201021163936.htm