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A new miniature species of Characidium is described from the upper Rio Paraguay basin, Brazil. The new species can be diagnosed from all congeners by the presence of a dark‐brown humeral blotch, vertically elongated (spanning 5 to 7 horizontal scale rows), with the shape of an upside‐down acute triangle. Additionally, it can be diagnosed by a short lateral line (6 to 8 perforated scales), the absence...
We investigated the potential effects of an invasive alien Poaceae (Urochloa arrecta) on the abundance, richness, and composition of native macrophytes and fish. Samples were collected in patches of macrophytes dominated by the invasive species and in others dominated by a native macrophyte (Eichhornia azurea). We assessed the potential effects of these two species on macrophyte and fish abundance...
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