The largest fish in the world's biggest river: Genetic connectivity and conservation of Arapaima gigas in the Amazon and Araguaia-Tocantins drainages.

Correlation between genetic divergence and geographic proximity Despite forming an evolutionarily coherent population, the genetic structure among localities in the larger, Amazonas basin group was not insignificant, and F ST values ranged from 0.019 and non-significant (Alto Jurua x Nhamundá) to 0.475 and highly significant ( P <0.0001; Lábrea x Região dos Lagos in Amapá) ( S2 Table and S4 Fig ).

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