Biologists at the University of California, San Diego have discovered that the proliferation in California of the introduced Argentine ant, a major pest that has invaded homes and displaced native species of ants in much of the coastal regions of the state, is due to the lack of genetic diversity among individuals up and down the coast.
A new imported misery to anticipate. From the distribution map, these suckers are close to us, too, but the story says that fire ants compete. So, fire ants are good for something. If you want a new entomological worry, look here.