A large wild salmon stock shows genetic and life history differentiation within, but not between, rivers

Antti Miettinen, Stefan Palm, Johan Dannewitz, Emma Lind, Craig R. Primmer, Atso Romakkaniemi, Johan Östergren & Victoria L. Pritchard
Anadromous salmonid fishes frequently exhibit strong geographic population structuring. However, population genetic differentiation of Atlantic salmon (Salmo salar) at fine geographic scales differs across equivalent spatial extents in different regions. So far, fine-scale genetic differentiation has not been assessed in rivers of the Baltic Sea, a region that contains an evolutionarily distinct Atlantic salmon lineage. Thus, Baltic salmon are currently managed on the river level, without focus on potential genetic structure and diversity within rivers....
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49 downloads reported since publication in 2020.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?