It’s well known that beaver dams transform landscapes. In their absence, artificial versions were built in northern California to recreate lost wetlands – boosting the survival of threatened coho salmon.  The findings are published in  Frontiers in Ecology and Evolution .  Fish biologist Michael Pollock of NOAA’s Northwest Fisheries Science Center called the results “mind blowing”.  Europe is dismantling its dams at a record-breaking rate – and it's saving rivers The largest dam-removal project in US history has finally been completed. Now something truly amazing is happening The Scott River valley in northern California was once home to so many beavers it was known as Beaver Valley. Their dams created an enormous riverine wetland, providing habitat for juvenile coho salmon and a host of other wildlife.  Then European fur trappers arrived in the 1830s.…