4.1 Detection of sympatric populations and divergence among
them
Conspecific populations that coexist in the same habitat without obvious
ecological divergence (cryptic sympatry) is a type of “hidden”
biodiversity that we still have limited knowledge of (Struck et al.,
2017). The present results suggest that the occurrence of cryptic
sympatry is a common phenomenon in these mountain lake systems. We
detected such structures in over 40 percent of the lakes, and they were
stable over time in occurrence as well as in amount of divergence. Our
observed F ST among sympatric populations are of a
similar order of magnitude as previously reported for cryptic,
sympatric, salmonid populations (Andersson et al., 2017a; Aykanat et
al., 2015; Marin et al., 2016; Wilson et al., 2004).