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76 results for “tropical rivers”
FIGURE 3 in Fish biodiversity of a tropical estuary under severe anthropic pressure (Doce River, Brazil)
FIGURE 3 | Examples of fishes recorded for the first time in the Doce River estuary. A. Cichlasoma dimerus; B. Pygocentrus nattereri; C. Coptodon rendalli; D. Butis koilomatodon; E. Lutjanus cyanopterus; F. Genidens barbus; G. Pimelodus maculatus; H. Catathyridium garmani. Photos: Helder C. Guabiroba (A, B, C, E, H), Flávio T. Szablak (D, F, G).
FIGURE 1 in Variation in patterns of fish assemblage and their environmental correlates in a tropical river basin from the Gulf of Mexico slope
FIGURE 1 | Study area and sampling sites in the Usumacinta River basin (shaded area in figure box), Mexico. Site number and names of the main rivers in the region are enclosed in boxes (see Tab. 1 for names of watercourses). Black arrow indicates flow direction.
FIGURE 2 in Variation in patterns of fish assemblage and their environmental correlates in a tropical river basin from the Gulf of Mexico slope
FIGURE 2 | Relative contribution of common species to total fish abundance by seasons (left panel) and years (right panel). Species shown had a contribution above the 50% quantile for abundance. Refer to Tab. 1 for species acronyms.
FIGURE 5 in Variation in patterns of fish assemblage and their environmental correlates in a tropical river basin from the Gulf of Mexico slope
FIGURE 5 | Plots for the redundancy analysis of fish communities and environmental data, displaying weighted averages of species scores (A), fitted site scores (B), and species scores of significant species (C). Centroids of factor "ORD" are indicated by a "×". Convex hulls (A, C) and point shape (A, B) show cluster affiliation. DO, dissolved oxygen; DU, distance to the confluence with the Usumacinta River; FC, forest cover; ORD, stream order; TC, water temperature.
FIGURE 4 in Variation in patterns of fish assemblage and their environmental correlates in a tropical river basin from the Gulf of Mexico slope
FIGURE 4 | Multivariate regression tree of transformed species abundances and environmental data. Percentage of improvement in the model is shown under each node; discriminating environmental variables and threshold values are shown at each split. DO, dissolved oxygen; ORD, stream order; n, number of samples.
FIGURE 3 in Variation in patterns of fish assemblage and their environmental correlates in a tropical river basin from the Gulf of Mexico slope
FIGURE 3 | Principal component analysis plot of environmental data. DO, dissolved oxygen; DU, distance to the confluence with the Usumacinta River; EC, electric conductivity; FC, forest cover; ORD, stream order.
Fig. 4 in Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir
Fig. 4. Ordination diagram from Canonical Correspondence Analysis of the abundance of the 14 most numerous species with abiotic variables. Zone codes: 1 = Zone 1; 2 = Zone 2; 3 = Zone 3; and 4 = Zone 4. Species codes: Aspar = Astyanax parahybae; Astbim = Astyanax cf. bimaculatus; Cickel = Cichla kelberi; Geobra = Geophagus brasiliensis; Hopmal = Hoplias malabaricus; Hypaur = Hypostomus auroguttatus; Hoplit = Hoplosternum littorale; Hypaff = Hypostomus affinis; Lepcop = Leporinus copelandii; Lepcon = Leporinus conirostris; Metmac = Metynnis maculatus; Olihep = Oligosarcus hepsetus; Pimmac = Pimelodus maculatus; Plasqu = Plagioscion squamosissimus.
Fig. 3 in Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir
Fig. 3. Spatial variation in species number and biomass by zone (1, 2, 3, 4) in Paraíba do Sul River and Funil Reservoir.
Fig. 1 in Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir
Fig. 1. Paraíba do Sul River - Funil Reservoir system. The four sampled zones are shown (1 = Zone 1; 2 = Zone 2; 3 = Zone 3, and 4 = Zone 4).
Fig. 2 in Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir
Fig. 2. Individual-based rarefaction curves by zone (1, 2, 3, 4) for species richness in the Paraíba do Sul River and Funil Reservoir.
Fig. 4. Fish assemblage ordination resulting from a in Flow seasonality and fish assemblage in a tropical river, French Guiana, South America
Fig. 4. Fish assemblage ordination resulting from a CA analysis using species (a), family (b), trophic guild (c), and MOS (d) descriptors in the downstream site, Comté River. Bold text indicates the species, family, trophic guild or MOS which contributes most to axes. Dots = samples taken during high waters; triangles = samples takes during low waters. Numbers correspond to fish species in Table 1. Axis scales are indicated in the small box.
Fig. 2. Water level oscillation measured between August 1998 and July 2000 in Flow seasonality and fish assemblage in a tropical river, French Guiana, South America
Fig. 2. Water level oscillation measured between August 1998 and July 2000 at the Hydrological station on the Comté River. The numbers indicate the mean water level during the month of sampling.
Fig. 1 in Flow seasonality and fish assemblage in a tropical river, French Guiana, South America
Fig. 1. Localization of the sampling sites on the Comté River, French Guiana. A = upstream site; B = downstream site; HS = Hydrological station.
River dams and the stability of bird communities: A hierarchical Bayesian analysis in a tropical hydroelectric power plant
<ol> <li>The effects of anthropogenic disturbance upon the stability of wildlife communities depend on the heterogeneity and connectivity of habitat remnants on multiple scales. The number of hydroelectric dams in biodiversity hotspots (Africa, South America and Asia) is growing rapidly. To establish their environmental impact, it is essential to understand the dynamics of wildlife communities before and following the establishment of dams.</li> <li>We evaluated the impacts of the filling of the Serra do Facão hydroelectric reservoir in the São Marcos river, central Brazil, upon the bird community. Using data from 1,145 surveys across 20 sampling sites over eight years, two years before and six years after the filling of the reservoir, we assessed the resistance, i.e., maintenance close to an equilibrium state during the disturbance, and resilience, i.e., ability to return to the original state following the disturbance, of the bird community. We used spatiotemporal hierarchical Bayesian models to assess the effects of reservoir filling on five community parameters: abundance, richness, phylogenetic diversity, functional diversity and species composition.</li> <li>In the period subsequent to reservoir filling, there was (i) a marked reduction in bird abundance, richness, phylogenetic diversity and functional diversity, and (ii) a reduction in the proportion of forest species, coupled with an increase in the proportion of savanna species. Except for bird abundance, none of the other community attributes returned to their original levels, even after six years. Our findings indicate that Cerrado bird communities have both low resistance and low resilience to habitat loss associated with the establishment of hydroelectric reservoirs.</li> <li> <i>Synthesis and applications.</i> The environmental costs of hydroelectric dams are still underestimated or neglected in Brazil. A new paradigm in the assessment of their environmental impacts is warranted, incorporating (i) models of spatiotemporal variations based on long-term monitoring with surveys initiated before disturbances and (ii) measures of functional and phylogenetic diversity, such that society can understand the costs and benefits of the establishment of new hydroelectric dams and make informed decisions. Biodiversity loss could be minimized by ensuring the preservation and connectivity of alluvial habitats, capable of maintaining the supply of resources and the functional and phylogenetic attributes of bird communities associated with such habitats.</li> </ol>
Fig. 3 in Habitat preferences of common native fishes in a tropical river in Southeastern Brazil
Fig. 3. Depth preferences of seven dominant native fish species in the Guandu River.
Fig. 4 in Habitat preferences of common native fishes in a tropical river in Southeastern Brazil
Fig. 4. Velocity preferences of seven dominant native fish species in the Guandu River.
Figure 6 in Temporal variability of the macroinvertebrate community associated with Eichhornia azurea (Swarts) Kunth (Pontederiaceae) in a lake marginal to a tropical river
Figure 6. Box-plots of macroinvertebrates community richness (expressed in log values).
Hydrochory, a key ecological function of a tropical dry forest river threatened by a dam and open-pit coal mining in Colombia
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River dams and the stability of bird communities: A hierarchical Bayesian analysis in a tropical hydroelectric power plant
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Floods connect tropical river-floodplain food webs but shrink fish community isotopic trophic niches
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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