Complex genetic diversity patterns of cryptic, sympatric brown trout (Salmo trutta) populations in tiny mountain lakes

isolated while the other one shows high genetic similarity to downstream populations.There are indications of different spawning sites as reflected in genetic structuring among parr from different creeks.We used >3000 SNPs on a subsample and find that the SNPs largely confirm the allozyme pattern but give considerably lower F ST values, and potentially indicate further structuring within populations.This type of complex genetic substructuring over microgeographical scales might be more common than anticipated and needs to be considered in conservation management.