Current and predicted ecological impacts of climate change to Atlantic salmon freshwater productivity in the North Atlantic.
eDNA metabarcoding reveals riverine fish community structure and climate associations in northeastern Canada.
Climate change is a major threat to northern freshwater ecosystems, but many remote areas lack biodiversity data.
Environmental DNA (eDNA) collection is easier than traditional methods and is being used more in hard-to-reach places.
This study used eDNA metabarcoding at 174 river sites in northeastern North America, including Newfoundland and Labrador, from 2019 to 2021. It identified 33 fish species, including three non-native ones and several new range expansions. Spatial and climate factors explained about 56% of the variation in fish communities.
Compared to historical data, eDNA detected more species on average.
This research is the most comprehensive survey of fish in Newfoundland and Labrador, revealing new species and offering insights for future eDNA use in northern rivers.