Adapting to adversity to thrive
In 1978 a young graduate student from the University of Pennsylvania named David Reznick, packed his bags and set off to the Caribbean Island of Trinidad. His mission? To examine Charles Darwin’s concept of the struggle for existence – specifically, how predator-prey interactions impact the evolution of new species. Armed with a topographical map traced onto a sheet of notepaper, Reznick collected 1 600 guppies, the prolific fish species whose females can produce dozens of babies every three to four weeks. Reznick was interested to see if the addition or removal of predators could affect genetic adaptation in guppies over a short period of time. The premise of the experiment was not considered promising. At that time scientists had studied evolution in controlled laboratory environments, but watching it happen in…