The global rule that predicts where life thrives—and where it fails

A simple rule that seems to govern how life is organized on Earth is described in a new study published on June 4 in Nature Ecology & Evolution.
The research team led, by Umeå University and involving the University of Reading, believe this rule helps explain why species are spread the way they are across the planet. The discovery will help to understand life on Earth - including how ecosystems respond to global environmental changes.
The rule is simple: in every region on Earth, most species cluster together in small 'hotspot' areas, then gradually spread outward with fewer and fewer species able to survive farther away from these hotspots.
Rubén Bernardo-Madrid, lead author and researcher at Umeå University (Sweden), said: "In every bioregion, there is always a core area where most species live. From that core, species expand into…