Native mussel numbers down almost 95% since 1960s, Thames survey finds

Scientists trying to replicate 1964 study say results reveal alarming deterioration in river’s ecosystemA survey of mussels has revealed an alarming deterioration in the River Thames ecosystem since the 1960s, according to a study.Scientists attempting to replicate a 1964 survey of freshwater bivalves in a stretch of the Thames near Reading found striking results, as native mussel populations had crashed by almost 95%. One native species, the depressed river mussel, had vanished completely