The three-spined stickleback is a funny sort of a fish. They’re somewhat non-distinct: drabbish silver, small, and minnow-like, native to salt- and freshwater bodies throughout most of the Northern hemisphere. However, different stickleback populations have evolved very distinct morphological traits, demonstrating a natural diversity that makes them an ideal candidate in which to examine the mechanics of adaptive evolution and ecology.
The house mouse, stickleback fish and honey bee appear to have little in common, but at the genetic level these creatures respond in strikingly similar ways to danger, researchers report. When any of these animals confronts an intruder, the researchers found, many of the same genes and brain gene networks gear up or down in response.
Most people have trouble telling them apart, but bumble bees, honey bees, stingless bees and solitary bees have home lives that are as different from one another as a monarch’s palace is from a hippy commune or a hermit’s cabin in the woods. A new study of these bees offers a first look at the genetic underpinnings of their differences in lifestyle.