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A multiple hypothesis approach to explain species richness patterns in neotropi...
Vieira, Thiago Bernardi; Pavanelli, C. S.; Casatti, Lilian; Smith, Welber Senteio; Benedito, Evanilde; Mazzoni, Rosana; Sánchez-Botero, Jorge IvánSeveral hypotheses are used to explain species richness patterns. Some of them (e.g. species-area, species-energy, environment-energy, water-energy, terrestrial primary productivity, environmental spatial heterogeneity, and climatic heterogeneity) are known to explain species richness patterns of terrestrial organisms, especially when they are combined. For aquatic organisms, however, it is unclear if these hyp...
Selection of netted prey by piranhas, Serrasalmus spilopleura and S. marginatus...
Agostinho, Carlos Sérgio; Marques, Elineide EugenioThe frequency of attacks by piranhas on specimens of netted fish was analyzed from monthly catches in gill nets set out for 24 hours and checked every 8 hours, from June 1987 through May 1988, in lakes, channels, and rivers of the upper Paraná river floodplain, Brazil. Captured fish were identified and marks of attack by piranhas on their fins and flesh were recorded. The probability of detection of netted fish...
Observation of an invasion of the piranha Serrasalmus marginatus Valenciennes, ...
Agostinho, Carlos Sérgio; Júlio Junior, Horácio FerreiraThe building of Itaipu Dam, 150 km downstream from Sete Quedas Falls, resulted in the natural geographical barrier drowning, with subsequent mixing of the fish faunas. Serrasalmus marginatus (Osteichthyes, Serrasalmidae), a species that had been restricted to the river segment downstream from Sete Quedas, invaded the Upper Paraná River. The catching of Serrasalmus spilopleura, a resident species, decreased dras...