suggests that most fish in the oceans today are descended from freshwater species. One possible implication of this, notes a report
it is possible that seas may be more prone to extinctions than land, rivers or lakes; while rivers and lakes form an "arc of survival" that can reseed the oceans when marine species are lost.
"I don't think our results show that seas are strongly inhospitable, but they may become so at certain points in time," [says study co-author John Wiens]. Unfortunately, the strong ocean acidification that is predicted for the near future means we may be heading for one of those times now, he adds.
Today, however, rivers and lakes may not be healthy enough to help re-supply the oceans...
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