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Waterfalls affect stream fish species richness and abundance, but not species composition or beta diversity in Southern Pantanal.

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Title: Waterfalls affect stream fish species richness and abundance, but not species composition or beta diversity in Southern Pantanal.
Authors: da Silva Córdova Junior, Renner Fernando1,2 (AUTHOR) renner.cordova@ifms.edu.br, Ferreira, Fabiane Silva3 (AUTHOR), Refatti, Alcione4 (AUTHOR), dos Santos, Dhonatan Oliveira5 (AUTHOR), Kashiwaqui, Elaine Antoniassi Luiz4,6,7 (AUTHOR), Súarez, Yzel Rondon3,6 (AUTHOR)
Source: Aquatic Ecology. Sep2025, Vol. 59 Issue 3, p923-935. 13p.
Subject Terms: *Waterfalls, *Biodiversity, *Wetland ecology, *Watersheds, *Landscape ecology, *Freshwater fishes, *Fish diversity
Geographic Terms: Pantanal, Rio Negro (Amazonas, Brazil)
Abstract: Local and regional factors at different scales influence fish biodiversity in streams. Similarly, waterfalls can contribute to the distribution of species richness and composition of assemblages. The Upper Paraguay River basin is crucial for conserving various fish species, but few large-scale studies on fish assemblages can be found in the literature. To address this knowledge gap, we investigated the hydrological anomalies of waterfalls from two perspectives: their effects on the richness and composition of fish assemblages and their contribution to beta diversity in the Rio Negro basin, the largest tributary of the Paraguay River on its left side. We specifically considered the effects of regional (e.g., sub-basins and altitude) and local factors (e.g., mean flow, water conductivity, water pH, concentration of dissolved oxygen) on these metrics. To do this, we sampled fifty-seven stretches of streams in the headwaters of the Rio Negro basin from May to August 2020 (dry period), using a different sampling method with rectangular sieve, trawl net and electrofishing. The areas below the waterfalls exhibited greater fish richness explained by regional (e.g., altitude) and local (e.g., oxygen concentration and conductivity) factors. Species composition, however, did not differ relative to these factors. The greatest contributions to Local Contribution to Beta Diversity (LCBD) came from sites with the lowest altitude and lowest oxygen concentration. Our results demonstrate the effect of waterfalls on fish assemblages and help to estimate the large-scale effect of local and regional factors on fish species richness and composition in a relatively pristine ecosystem important to the conservation of Neotropical fish species. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 187672273
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Waterfalls affect stream fish species richness and abundance, but not species composition or beta diversity in Southern Pantanal.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22da+Silva+Córdova+Junior%2C+Renner+Fernando%22">da Silva Córdova Junior, Renner Fernando</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> renner.cordova@ifms.edu.br</i><br /><searchLink fieldCode="AR" term="%22Ferreira%2C+Fabiane+Silva%22">Ferreira, Fabiane Silva</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Refatti%2C+Alcione%22">Refatti, Alcione</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22dos+Santos%2C+Dhonatan+Oliveira%22">dos Santos, Dhonatan Oliveira</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kashiwaqui%2C+Elaine+Antoniassi+Luiz%22">Kashiwaqui, Elaine Antoniassi Luiz</searchLink><relatesTo>4,6,7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Súarez%2C+Yzel+Rondon%22">Súarez, Yzel Rondon</searchLink><relatesTo>3,6</relatesTo> (AUTHOR)
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Aquatic+Ecology%22">Aquatic Ecology</searchLink>. Sep2025, Vol. 59 Issue 3, p923-935. 13p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Waterfalls%22">Waterfalls</searchLink><br />*<searchLink fieldCode="DE" term="%22Biodiversity%22">Biodiversity</searchLink><br />*<searchLink fieldCode="DE" term="%22Wetland+ecology%22">Wetland ecology</searchLink><br />*<searchLink fieldCode="DE" term="%22Watersheds%22">Watersheds</searchLink><br />*<searchLink fieldCode="DE" term="%22Landscape+ecology%22">Landscape ecology</searchLink><br />*<searchLink fieldCode="DE" term="%22Freshwater+fishes%22">Freshwater fishes</searchLink><br />*<searchLink fieldCode="DE" term="%22Fish+diversity%22">Fish diversity</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Pantanal%22">Pantanal</searchLink><br /><searchLink fieldCode="DE" term="%22Rio+Negro+%28Amazonas%2C+Brazil%29%22">Rio Negro (Amazonas, Brazil)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Local and regional factors at different scales influence fish biodiversity in streams. Similarly, waterfalls can contribute to the distribution of species richness and composition of assemblages. The Upper Paraguay River basin is crucial for conserving various fish species, but few large-scale studies on fish assemblages can be found in the literature. To address this knowledge gap, we investigated the hydrological anomalies of waterfalls from two perspectives: their effects on the richness and composition of fish assemblages and their contribution to beta diversity in the Rio Negro basin, the largest tributary of the Paraguay River on its left side. We specifically considered the effects of regional (e.g., sub-basins and altitude) and local factors (e.g., mean flow, water conductivity, water pH, concentration of dissolved oxygen) on these metrics. To do this, we sampled fifty-seven stretches of streams in the headwaters of the Rio Negro basin from May to August 2020 (dry period), using a different sampling method with rectangular sieve, trawl net and electrofishing. The areas below the waterfalls exhibited greater fish richness explained by regional (e.g., altitude) and local (e.g., oxygen concentration and conductivity) factors. Species composition, however, did not differ relative to these factors. The greatest contributions to Local Contribution to Beta Diversity (LCBD) came from sites with the lowest altitude and lowest oxygen concentration. Our results demonstrate the effect of waterfalls on fish assemblages and help to estimate the large-scale effect of local and regional factors on fish species richness and composition in a relatively pristine ecosystem important to the conservation of Neotropical fish species. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10452-025-10204-y
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 923
    Subjects:
      – SubjectFull: Waterfalls
        Type: general
      – SubjectFull: Biodiversity
        Type: general
      – SubjectFull: Wetland ecology
        Type: general
      – SubjectFull: Watersheds
        Type: general
      – SubjectFull: Landscape ecology
        Type: general
      – SubjectFull: Freshwater fishes
        Type: general
      – SubjectFull: Fish diversity
        Type: general
      – SubjectFull: Pantanal
        Type: general
      – SubjectFull: Rio Negro (Amazonas, Brazil)
        Type: general
    Titles:
      – TitleFull: Waterfalls affect stream fish species richness and abundance, but not species composition or beta diversity in Southern Pantanal.
        Type: main
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          Name:
            NameFull: da Silva Córdova Junior, Renner Fernando
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            NameFull: Ferreira, Fabiane Silva
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            NameFull: Refatti, Alcione
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            NameFull: dos Santos, Dhonatan Oliveira
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            NameFull: Kashiwaqui, Elaine Antoniassi Luiz
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            NameFull: Súarez, Yzel Rondon
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          Dates:
            – D: 01
              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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              Value: 13862588
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              Value: 59
            – Type: issue
              Value: 3
          Titles:
            – TitleFull: Aquatic Ecology
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