February 14, 2012
Rapid Evolution Need Not Follow Mass Extinction
Science Daily, Science Daily
In the wake of a mass extinction like the one that occurred 445 million years ago, a common assumption is that surviving species tend to proliferate quickly into new forms, having outlived many of their competitors.
But new research shows that tiny marine organisms called graptoloids did not begin to rapidly develop new physical traits until about 2 million years after competing species became extinct.
TAGGED: evolution, mass extinction