A reflection of the sky on the wide black water Negro River, the main north bank tributary of the Amazon River, which is a barrier to gene flow between vertebrates found on the Guiana Shield and the Imeri area of endemism. Photo taken by Alan Fecchio from a boat in northeast Amazonas, Brazil during a 2012 SISBIOTA field expedition to collect vertebrate specimens from both banks of the middle Negro River. Full paper here

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