Human-mediated evolution in a threatened species? Juvenile life-history changes in Snake River salmon.

ABSTRACT: Evaluations of human impacts on Earth's ecosystems often ignore evolutionary changes in response to altered selective regimes. Freshwater habitats for Snake River fall Chinook salmon (SRFCS), a threatened species in the US, have been dramatically changed by hydropower development and other watershed modifications. Associated biological changes include a shift in juvenile life history: Historically essentially 100% of juveniles migrated to sea as subyearlings, but a substantial fraction have migrated as yearlings in recent years. In contemplating future management actions for this species should major Snake River dams ever be removed (as many have proposed), it will be important to understand whether evolution is at least partially responsible for this life-history change. We hypothesized t

SUBMITTER: Waples RS 

PROVIDER: S-EPMC5511361 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature