A study that links low summertime water flows in a British Columbia river with lower productivity across 22 generations of a struggling salmon population could help guide how rivers are managed to support fish, the authors say. The study, published Friday in the journal Ecological Solutions and Evidence, used data from 1992 to 2013 to examine changes in the productivity of early summer chinook in the Nicola River, a tributary of the Thompson River in B.C.'s southern Interior.