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66 results for “Xingu River”
Fig. 3 in Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, Brazil
Fig. 3. Size at first sexual maturity in the red-tailed catfish Phractocephalus hemioliopterus specimens collected from the Xingu River in Pará, Brazil.
Fig. 5 in Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, Brazil
Fig. 5. Relative frequency (%) of the different gonadal maturation stages of the red-tailed catfish Phractocephalus hemioliopterus specimens collected from the Xingu River in Pará, Brazil. a. males; and b. females.
Fig. 2 in Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini), an ornamental fish endemic to the Xingu River, Brazil
Fig. 2. Karyotype of Baryancistrus xanthellus in conventional staining. The square indicates the pair that bears the nucleolus organizer region (NOR).
Fig. 3 in Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini), an ornamental fish endemic to the Xingu River, Brazil
Fig. 3. Karyotype of Baryancistrus xanthellus: a) C-banding; b) Mapping of rDNA 18S (red signal) and 5S (green signal) through double FISH.
Data about the aquatic insects drift in Xingu River
<p>The drift movement consists of the displacement of the organisms inside the water which allows its locomotion. This movement will result in a variation of the communities of organisms along the river, generating patterns. Based on this, we tested the hypotheses a) the movement of organisms along an upstream-downstream gradient will result in a pattern of nesteness distribution of organisms in aquatic insect communities; b) there will be an increase in the number of individuals and genera as we approach the most downstream point. The present study was carried out in seven sampling points distributed along the Xingu River. The sampling occurred at night in the central area of the river. The distribution of genera along the river remained constant. A nesteness distribution of the communities in the upstream-downstream gradient was not observed. Based on the results it is possible to visualize that the dispersion movement generates a nestedness of the genera downstream of the river, occurring a confluence for the last sampling point. The organisms are carried by the flow of the water stream and are influenced by the characteristics of the water body adapting to the type of environment in which they are located.</p>
FIGURE 4 in Dietary shift of a pimelodid catfish in response to the flood pulse in the Xingu River
FIGURE 4 | Trophic niche breadth of Pimelodus blochii collected in different hydrological periods in the middle Xingu River region (Eastern Amazon, Brazil). Based on centroid distances between groups from the Permutational Multivariate Dispersion Analysis (PERMDISP).
FIGURE 3 in Dietary shift of a pimelodid catfish in response to the flood pulse in the Xingu River
FIGURE 3 | Non-metric Multidimensional Scaling (nMDS) graphical representation of the diet of Pimelodus blochii collected in different hydrological periods in the middle Xingu River region, Eastern Amazon, Brazil.
FIGURE 2 in Dietary shift of a pimelodid catfish in response to the flood pulse in the Xingu River
FIGURE 2 | Alimentary index (Ai) of the diet of Pimelodus blochii collected in different hydrological periods in the middle Xingu River region, Eastern Amazon, Brazil. *Less than 5% of contribution.
FIGURE 1 in Dietary shift of a pimelodid catfish in response to the flood pulse in the Xingu River
FIGURE 1 | Map depicting the Volta Grande do Xingu (Xingu River, Brazil), with emphasis on the reduced flow section created by the construction of the Belo Monte Dam (including the Pimental Dam). The orange circles represent the sampling sites where Pimelodus blochii specimens were collected, and the arrows indicate the direction of water flow. The orange star and triangle represent the Pimental Dam and the Belo Monte Dam, respectively.
Figures 1-8 in A new species of Diaphorocleidus (Monogenea: Ancyrocephalinae) from the gills of Argonectes robertsi (Characiformes) and new records of dactylogyrids parasitic on fishes from the Xingu River, Amazon Basin, Brazil
Figures 1-8. Diaphorocleidus altamirensis sp. nov.: (1) whole mount (composite, ventral view); (2) ventral anchor; (3) dorsal anchor; (4) ventral bar; (5) dorsal bar; (6) hook (pair 2); (7) hook, pair 5; (8) copulatory complex (dorsal). Scale bars: 1 = 100 µm, 2-5 = 25 µm, 6-7 = 10 µm, 8 = 20 µm.
FIGURE 3 in Diversity of Loricariidae (Actinopterygii: Siluriformes) assemblages in two Conservation Areas of the Middle Xingu River, Brazilian Amazon, and their suitability for sustainable ornamental fisheries
FIGURE 3 | Principal component analysis (PCA) for composition of ornamental fish species based on the method of capture (Hellinger transformation), considering the two extractive reserves.
FIGURE 4 in Diversity of Loricariidae (Actinopterygii: Siluriformes) assemblages in two Conservation Areas of the Middle Xingu River, Brazilian Amazon, and their suitability for sustainable ornamental fisheries
FIGURE 4 | Principal Component Analysis (PCA) of fish composition in the drainages of both the Xingu and Iriri River RESEXes (Hellinger transformation). Only species names that made greatest contributions to compositional differences are shown.
FIGURE 2 in Diversity of Loricariidae (Actinopterygii: Siluriformes) assemblages in two Conservation Areas of the Middle Xingu River, Brazilian Amazon, and their suitability for sustainable ornamental fisheries
FIGURE 2 | Venn diagram showing the compositions of the Loricariidae species found in both extractive reserves.
FIGURE 6 in A new species of armored catfish of the genus Scobinancistrus (Loricariidae: Hypostominae) from the Xingu River basin, Brazil
FIGURE 6 | Underwater photography at the exact same locality in Gorgulho da Rita. Above, October 2015, showing a rapids' habitat with high tridimensional complexity occupied by several species of fish (on the picture: Teleocichla preta, Leporinus tigrinus, Hypomasticus julii). Below, October 2017, same spot after Belo Monte Dam implementation showing that the absence of current promoted siltation and the disappearance of rheophilic species from the area. Photos: Leandro M. Sousa
FIGURE 5 in A new species of armored catfish of the genus Scobinancistrus (Loricariidae: Hypostominae) from the Xingu River basin, Brazil
FIGURE 5 | Scobinancistrus raonii hiding underneath its preferred microhabitat: conglomerate plates of gravel and iron oxide. Photo: Leandro M. Sousa.
FIGURE 4 in A new species of armored catfish of the genus Scobinancistrus (Loricariidae: Hypostominae) from the Xingu River basin, Brazil
FIGURE 4 | Partial map of the Xingu River, showing the distribution of Scobinancistrus raonii (yellow circles). Black circle indicates type locality. Shaded area indicates the Impact Zone of the Belo Monte Dam Complex. Dark blue stretch of the river represents the dammed area. Red stretch indicates the reduced flow impacted area.
FIGURE 3 in A new species of armored catfish of the genus Scobinancistrus (Loricariidae: Hypostominae) from the Xingu River basin, Brazil
FIGURE 3 | Photo in ventral view of the mouth of Scobinancistrus raonii, INPA 40512, paratype, 80.9 mm SL. Photo: Leandro M. Sousa.
FIGURE 2 in A new species of armored catfish of the genus Scobinancistrus (Loricariidae: Hypostominae) from the Xingu River basin, Brazil
FIGURE 2 | Lateral view of live specimens of Scobinancistrus raonii, Brazil, Pará, Xingu River, Volta Grande do Xingu. Paratypes: INPA 40512, 80.9 mm SL, juvenile (above); LIA 5054, 94.4 mm SL, subadult (middle); ANSP 194989, 120.8 mm SL, adult (below). Photos: Leandro M. Sousa (juvenile and subadult) and Mark H. Sabaj (adult).
FIGURE 1 in A new species of armored catfish of the genus Scobinancistrus (Loricariidae: Hypostominae) from the Xingu River basin, Brazil
FIGURE 1 | Lateral, dorsal and ventral views of Scobinancistrus raonii, INPA 59493, holotype, 99.6 mm SL, Senador José Porfírio, Xingu River, ca. 3.5 km downstream from BR-230. Photo: Leandro M. Sousa.
FIGURE 7 in New species of Phenacorhamdia (Siluriformes: Heptapteridae) from the Xingu River basin
FIGURE 7 | Geographic distribution of Phenacorhamdia suia in Brazilian Shield. Black star = holotype. Red circles = paratypes localities.
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