Great white sharks split into 3 populations 200,000 years ago and never mixed again — except for one

[Grim Reaper 6]

In the study, published July 23 in the journal Current Biology, scientists sequenced the genomes of 89 great white sharks (Carcharodon carcharias) sampled worldwide. Their results pointed to three distinct groups that diverged over time and did not interbreed. These groups are found in three locations: the North Atlantic/Mediterranean, Indo-Pacific and North Pacific oceans. 

"Now we understand that if you wipe out sharks in a particular area, they're not going to be repopulated by sharks from another lineage," study co-author Leslie Noble, a molecular evolutionary ecologist at Nord University in Norway, told Live Science. "The so-called global population of white sharks has now shrunk to these three very discreet units. And it's really quite concerning.".

https://www.livescience.com/animals/sharks/great-white-sharks-split-into-3-populations-200000-years-ago-and-never-mixed-again-except-for-one-hybrid-found-in-the-bermuda-triangle