Low Genetic Diversity and Complex Population Structure in Black Piranha (<i>Serrasalmus rhombeus</i>), a Key Amazonian Predator.

Factors Impacting Gene Flow The Mantel test was significant only for the relationship between the genetic distance and the connectivity of sites by water flow ( r = 0.33, p = 0.003) and marginally significant for water type ( r = 0.16, p = 0.06), but neither for the geographic distance nor for the Euclidean distance of environmental parameters (Figure 4 ).

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