Effects of a small natural barrier on the spatial distribution of the fish assemblage in the Verde River, Upper Paraná River Basin,Brazil

Silva, J. C.; Gubiani, Éder André; Piana, Pitágoras Augusto; Delariva, Rosilene Luciana

doi:10.1590/1519-6984.01215

Cited by 9 publications

(7 citation statements)

References 44 publications

(60 reference statements)

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“…Following the pattern presented in other drainages (e.g. Corrêa et al 2015, Silva et al 2016, the species richness increased in the upstreamdownstream direction, which is related to the increased diversity and complexity of microhabitats. The rise in richness values due to the increase in the types of environments is in line with what was expected by the River Continuum Concept (Vannote et al 1980).…”

Section: Discussionsupporting

confidence: 63%

“…According to Garutti (1988), as they have a smaller volume of water, the headwaters of the streams do not support a large number of individuals and do not favor the emergence of varied microhabitats, which influences species richness. Modifications in the fish assemblages following the longitudinal gradient of a river are expected, as a result of evolutionary adaptations of each species (Silva et al 2016).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Composition and distribution of fishes from the Perequê-Açu river basin, Paraty, Rio de Janeiro, Southeastern Brazil

Guimarães

Souza²,

Rodrigues

et al. 2021

Biota Neotrop.

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The large number of less-known coastal drainages in the Atlantic Forest still represents an important gap in the knowledge of ichthyofauna. It is evaluated the taxonomic diversity, frequency and constancy of occurrence, and the distribution of species in the various segments of the Perequê-Açu river basin, state of Rio de Janeiro, Brazil. Twelve sampling campaigns resulted in 13,423 individuals, belonging to seven orders, 10 families, 21 genera, and 23 native species. Cyprinodontiformes and Siluriformes represented about 87.2% of the total abundance, mainly due to the contribution of Phalloceros anisophallos and Schizolecis guntheri, which account for 63.2% of the total sampled individuals. The analysis of constancy of occurrence reveals that 78.3% of the drainage species are residents, with approximately 93% of the residents of the Carrasquinho River sub-basin. The Sertões River sub-basin had the largest number of species in total: 18. The rarefaction curve did not reach an asymptote, although Chao 2 and bootstrap estimate the richness of 23.9 species and 23.7 species, respectively. The results of PERMANOVA, PCoA, and SIMPER indicate that the fish composition along the catchment is not homogeneous. The conservation status of species is also discussed, regionally, nationally, and globally.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Composition and distribution of fishes from the Perequê-Açu river basin, Paraty, Rio de Janeiro, Southeastern Brazil

Guimarães

Souza²,

Rodrigues

et al. 2021

Biota Neotrop.

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“…Robust observational data of fish migration in natural streams within the basin would strengthen our understanding of slope thresholds for migratory fish species. A second observational study occurred at the Branca Waterfall on the Verde River, which is a tributary of the Paraná (Silva, Gubiani, Piana, & Delariva, ). Fish assemblages were recorded upstream and downstream from this 1.5 m high waterfall.…”

Section: Methodsmentioning

confidence: 99%

Predicted impacts of proposed hydroelectric facilities on fish migration routes upstream from the Pantanal wetland (Brazil)

Campos

Tritico

Girard

et al. 2020

River Research & Apps

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There are 104 hydroelectric facilities proposed to be installed in the watersheds that feed the Pantanal, a vast floodplain wetland located mostly in Brazil. The Pantanal is host to 23 long‐distance migratory fish species that ascend upland tributaries to spawn. A Geographic Information System was used to predict the impact of hydroelectric dams on potential migration routes for these species. Both anthropogenic (hydroelectric dams) and natural barriers were included in the analysis. Natural barriers were identified by river slope. Critical river slopes of 10 and 25%, above which fish were predicted to be incapable of ascending, were modeled as natural barriers. Based on this model, we show that between 2 and 14% of rivers in the Pantanal watershed are naturally blocked to fish migration. An additional 5 to 9% of rivers are currently blocked due to 35 existing hydroelectric facilities. If all proposed dams are built, the area flooded by new reservoirs will triple and the river kilometers blocked will double, blocking 25 to 32% of the river system to fish migration. The Taquari and Cuiabá River sub‐basins will be the most impacted, each having more than 70% of their rivers blocked. The impact of individual proposed facilities on the loss of migration routes is related to their proximity to existing barriers. Fourteen of the proposed dams are upstream from existing barriers and will therefore not further restrict long‐distance fish migration routes while proposed dams are predicted to close an additional 11,000 to 12,000 km of river channels.

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“…Mientras que Kruse et al (1997) describieron la ausencia de salmónidos en pendientes sobre el 10%. Asimismo, la presencia de rápidos, saltos y cascadas naturales en sistemas fluviales afectan los procesos de dispersión y definen diferencias de riqueza y diversidad entre los ensambles de peces localizados antes y después de estas barreras (Robinson & Rand 2005;Olden et al 2010;Torrente-Vilara et al 2011;Silva et al 2015). También son precursoras de crear nuevos hábitats acuáticos (Rahel 2007, Torrente-Vilara et al 2011, aumentar la segregación entre los ensambles (Hubert & Renno 2006;Olden et al 2010) y de promover procesos de endemismo (Ricklefs & Schluter 1993).…”

Section: Introductionunclassified

Barreras geográficas: ¿Intervienen en la composición y distribución longitudinal en la comunidad íctica de un río?

Catchpole¹,

Rojas²,

Medina³

et al. 2020

Gayana (Concepc.)

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Diversas son las variables que intervienen en la distribución y ocupación espacio-temporal de peces en un sistema fluvial. En este estudio evaluamos variables geográficas (cascadas, saltos, rápidos, pendiente, altitud) y fisicoquímicas (velocidad de corriente, pH, conductividad y oxígeno disuelto) en distintos tramos del río Quimán y su relación con el ensamble de peces. Este río, al ser cordillerano, presenta una orografía abrupta con diversas cascadas, saltos y rápidos que afectan su conectividad. Por ello, la hipótesis de trabajo fue establecer si estas variables geográficas y fisicoquímicas pueden influir en la segregación espacial de los peces en el río. Los resultados mostraron una variación significativa (ANOSIM r = 0,6 p = 0,0006) en la composición del ensamble a lo largo del río, definiendo una segregación espacial por parte de las especies nativas, y un uso de hábitat preferencial por parte de las especies nativas en ambientes de baja velocidad de corriente (< 0,64 m s-1) y pendientes menores al 3,5%. Sin embargo, mediante el análisis BEST/BIOENV determinó una baja relación entre las variables ambientales y la distribución del ensamble de peces (r = 0,37 p = 0,03) en el Río Quimán. Por otra parte, la frecuencia de cascadas, saltos y rápidos disminuyeron en el sentido de la corriente, en contraste con la riqueza y diversidad, aun cuando existe una piscicultura y una planta de tratamiento en el tramo terminal. Se sugiere desarrollar estudios más específicos para entender la influencia que ejercen las variables geográficas sobre las poblaciones de peces nativas.

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Effects of a small natural barrier on the spatial distribution of the fish assemblage in the Verde River, Upper Paraná River Basin,Brazil

Cited by 9 publications

References 44 publications

Composition and distribution of fishes from the Perequê-Açu river basin, Paraty, Rio de Janeiro, Southeastern Brazil

Composition and distribution of fishes from the Perequê-Açu river basin, Paraty, Rio de Janeiro, Southeastern Brazil

Predicted impacts of proposed hydroelectric facilities on fish migration routes upstream from the Pantanal wetland (Brazil)

Barreras geográficas: ¿Intervienen en la composición y distribución longitudinal en la comunidad íctica de un río?

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