Drivers of fish trophic guild composition in lakes of the Upper Paraná River floodplain

Lopes, Taise Miranda; Muniz, Carolina Mendes; Schmitz, Marcelo Henrique; Dias, Rosa Maria; Rodrigues, Amanda Cantarute; Buzo, Matheus Gimenez; Couto, Edivando Vitor do; Agostinho, Ângelo Antônio

doi:10.1007/s00027-022-00860-9

Cited by 3 publications

(3 citation statements)

References 80 publications

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“…In the Sorocaba River, there was a high percentage of detritivorous species (42%), but a lower percentage than that found in the main river, while in the Capivari River omnivorous species predominated (46%) (Figure 8). Detritivore [33] Note: * Trophic guild for the genus. The plotted results of the nMDS analysis show a clear difference between the ichthyofauna of the main river compared to the tributaries (Figure 9), with very few species directly associated with the Tietê.…”

Section: Ichthyofaunamentioning

confidence: 99%

Excessive Eutrophication as a Chemical Barrier for Fish Fauna Dispersion: A Case Study in the Emblematic Tietê River (São Paulo, Brazil)

Urbanski,

Nogueira

2024

Water

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The Tietê River receives most of the effluents and diffuse wastes from the São Paulo metropolis (21.9 million inhabitants). The study aimed to assess the extent to which environmental changes affected the fish fauna. We compared, in rainy and dry seasons, three sites in Tietê and three in tributaries with much better water quality conditions. No physical barriers exist between the sites. Fish were sampled with gillnets (exposed overnight) and the assemblage’s ecological attributes calculated. Water depth, transparency, temperature, electrical conductivity, dissolved oxygen, turbidity, total dissolved solids, pH, redox potential, total phosphorus, total nitrogen, and chlorophyll were simultaneously determined. Low oxygen concentrations (near zero in the rainy period), and the opposite for nutrients and total solids, separated the predominantly hypereutrophic Tietê from the tributaries (PCA). Differences in the fish assemblages were also evidenced (nMDS), including a higher richness per sample in tributaries (11 to 14 spp.) compared to Tietê (3 to 4 spp.). Siluriformes with accessory breathing dominated in Tietê and the highly tolerant detritivorous Prochilodus lineatus (the main commercial fish) was the only species found in all sites. The species correlated positively with oxygen in the tributaries and with turbidity, redox potential, and nutrients in Tietê (DistLM) (rainy season). Recovery measures are urgently required.

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Section: Ichthyofaunamentioning

confidence: 99%

Excessive Eutrophication as a Chemical Barrier for Fish Fauna Dispersion: A Case Study in the Emblematic Tietê River (São Paulo, Brazil)

Urbanski,

Nogueira

2024

Water

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“…However, most large rivers of the world are heavily regulated by dams that dampen seasonal pulses and affect the sh community (Winemiller et al 2016). Consequently, while some lakes in oodplains remain connected to the main river, others become isolated (Lopes et al 2022). This disconnection from the main channel reduces sh diversity in lakes, since predation and competition are intensi ed and food availability decreases (Junk et al 1989; Liu and Wang 2010; Quirino et al 2017).…”

Section: ; López-delgado Et Al 2020) While the Replacement Component ...mentioning

confidence: 99%

“…The rst is the presence of a cascade of reservoirs upstream of the Upper Paraná River oodplain, which directly in uences the habitats of the Paraná subsystem, while having a substantially smaller in uence for the Baía and Ivinhema subsystems (Agostinho et al 2004;Roberto et al 2009). The second concerns the uctuation of the hydrometric level, which is independent in each of the three subsystems (Souza-Filho et al 2004), leading to environmental changes and high sh diversity in these locations (Agostinho et al 2004;Lopes et al 2022).…”

Section: The In Uence Of Non-native Species On Beta-diversitymentioning

confidence: 99%

Influence of species invasion, seasonality, and connectivity on fish functional and taxonomic beta-diversity in a Neotropical floodplain

et al. 2023

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Studies that combine functional and taxonomic beta-diversity are essential for explaining some ecological processes, including the process of species invasion. We evaluated whether environmental factors (such as lake connectivity, subsystem and hydrological period) and biological factors (occurrence and richness of non-native and native sh species) affect beta-diversity components (total, richness and replacement) of sh communities living in the Upper Paraná River oodplain in Brazil. For this, a distance-based redundancy analysis (dbRDA) was performed for both taxonomic (BDtax) and functional (BDfunc) approaches. In order to see which variables in uence the local contribution to BDtax and BDfunc (LCBD), mixed effects regression models were tted. Our results indicated a signi cant in uence of environmental and biological factors on the taxonomic patterns of beta diversity and functional betadiversity of sh between lakes. Environmental factors in uenced the replacement component for both taxonomic and functional diversity, while biotic factors (occurrence and richness of non-native species) in uenced the richness component. The richness of native and non-native species, the occurrence of nonnative species and hidrological period showed signi cant in uence on LCBD values. Although in our study the occurrence and richness of non-native species are related to beta-diversity, in the long term, these species can cause a decrease in functional and taxonomic beta-diversity, altering the ecological multifunctionality of the environment. Our study emphasizes that both changes in environmental factors and species diversity (such as the introduction of a non-native species) can impact the beta-diversity of Neotropical sh.

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Influence of species invasion, seasonality, and connectivity on fish functional and taxonomic beta-diversity in a Neotropical floodplain

Aleixo

Florêncio

Lansac‐Tôha

et al. 2023

Preprint

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Studies that combine functional and taxonomic beta-diversity are essential for explaining some ecological processes, including the process of species invasion. We evaluated whether environmental factors (such as lake connectivity, subsystem and hydrological period) and biological factors (occurrence and richness of non-native and native fish species) affect beta-diversity components (total, richness and replacement) of fish communities living in the Upper Paraná River floodplain in Brazil. For this, a distance-based redundancy analysis (dbRDA) was performed for both taxonomic (BDtax) and functional (BDfunc) approaches. In order to see which variables influence the local contribution to BDtax and BDfunc (LCBD), mixed effects regression models were fitted. Our results indicated a significant influence of environmental and biological factors on the taxonomic patterns of beta diversity and functional beta-diversity of fish between lakes. Environmental factors influenced the replacement component for both taxonomic and functional diversity, while biotic factors (occurrence and richness of non-native species) influenced the richness component. The richness of native and non-native species, the occurrence of non-native species and hidrological period showed significant influence on LCBD values. Although in our study the occurrence and richness of non-native species are related to beta-diversity, in the long term, these species can cause a decrease in functional and taxonomic beta-diversity, altering the ecological multifunctionality of the environment. Our study emphasizes that both changes in environmental factors and species diversity (such as the introduction of a non-native species) can impact the beta-diversity of Neotropical fish.

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Drivers of fish trophic guild composition in lakes of the Upper Paraná River floodplain

Cited by 3 publications

References 80 publications

Excessive Eutrophication as a Chemical Barrier for Fish Fauna Dispersion: A Case Study in the Emblematic Tietê River (São Paulo, Brazil)

Excessive Eutrophication as a Chemical Barrier for Fish Fauna Dispersion: A Case Study in the Emblematic Tietê River (São Paulo, Brazil)

Influence of species invasion, seasonality, and connectivity on fish functional and taxonomic beta-diversity in a Neotropical floodplain

Influence of species invasion, seasonality, and connectivity on fish functional and taxonomic beta-diversity in a Neotropical floodplain

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