The present study compares the patterns of fish’s diversity of the Alto Yurúa Basin. The study area included three sub basins: Beu, Breu and Yurúa, all without anthropogenic impact. Fishing was carried out with trawls, 10564 individuals were collected and 185 fish’s species were identified. In regional scale, the average of the Shannon diversity index (H’) for Beu was of 2,02; for Breu 1,84 and Yuruá 1,75. The rarefaction analysis shows to Yurúa with the highest species richness (91 spp.), in comparison with Beu (87) and Breu (68). In the local scale, the diversity average (H’) was highest in lotic environments (Beu 2,04; Breu 1,90; and Yurúa 1,86), compared with respective lentics environments (Beu 1,66; Breu 1,86; and Yurúa 1,82). The highest diversity of fishes observed in lotic environments could be explained because the most of Amazonian fishes have the behavior to tra...

The present study compares the patterns of fish’s diversity of the Alto Yurúa Basin. The study area included three sub basins: Beu, Breu and Yurúa, all without anthropogenic impact. Fishing was carried out with trawls, 10564 individuals were collected and 185 fish’s species were identified. In regional scale, the average of the Shannon diversity index (H’) for Beu was of 2,02; for Breu 1,84 and Yuruá 1,75. The rarefaction analysis shows to Yurúa with the highest species richness (91 spp.), in comparison with Beu (87) and Breu (68). In the local scale, the diversity average (H’) was highest in lotic environments (Beu 2,04; Breu 1,90; and Yurúa 1,86), compared with respective lentics environments (Beu 1,66; Breu 1,86; and Yurúa 1,82). The highest diversity of fishes observed in lotic environments could be explained because the most of Amazonian fishes have the behavior to tra...

The present paper describes the diversity and state of conservation, determinate by a rapid biological inventory, carried out since October 24 to 30 of 2005, at the Amazonian waterbodies from Northeast of Peru, between 680 and 133 m of altitude, among Tarapoto (San Martin) and Yurimaguas (Loreto). Data and samples were collected in 26 stations. Planckton samples were collected with standard net (40 microns), benthos with Surber net and fishes with small mesh seines. Descriptions of each habitat included coordinates (UTM), and limnological characteristics (pH, temperature, conductivity, oxygen). The richness of species of fishes was of 95, dominated by Characiformes and Siluriformes. Richness of species in phytoplankton was of 74, in zooplankton, 22 species and in benthos of 20 species. The conservation state was determined using the Index of Biological Integrity (IBI) for fishes, and EPT...

The present paper describes the diversity and state of conservation, determinate by a rapid biological inventory, carried out since October 24 to 30 of 2005, at the Amazonian waterbodies from Northeast of Peru, between 680 and 133 m of altitude, among Tarapoto (San Martin) and Yurimaguas (Loreto). Data and samples were collected in 26 stations. Planckton samples were collected with standard net (40 microns), benthos with Surber net and fishes with small mesh seines. Descriptions of each habitat included coordinates (UTM), and limnological characteristics (pH, temperature, conductivity, oxygen). The richness of species of fishes was of 95, dominated by Characiformes and Siluriformes. Richness of species in phytoplankton was of 74, in zooplankton, 22 species and in benthos of 20 species. The conservation state was determined using the Index of Biological Integrity (IBI) for fishes, and EPT...