Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain
Abstract Landscape change caused by hydropower dam construction and invasion of agriculture in the riparian zone has been a catalyst for alterations in fish food web dynamics. The objectives of this study were to investigate the trophic state and land use of three rivers, one directly impacted by a...
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Sociedade Brasileira de Ictiologia
2024-10-01
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| Series: | Neotropical Ichthyology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252024000300212&lng=en&tlng=en |
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| author | Vinícius de Andrade Urbano Driele Delanira-Santos Matheus Maximilian Ratz Scoarize Evanilde Benedito |
| author_facet | Vinícius de Andrade Urbano Driele Delanira-Santos Matheus Maximilian Ratz Scoarize Evanilde Benedito |
| author_sort | Vinícius de Andrade Urbano |
| collection | DOAJ |
| description | Abstract Landscape change caused by hydropower dam construction and invasion of agriculture in the riparian zone has been a catalyst for alterations in fish food web dynamics. The objectives of this study were to investigate the trophic state and land use of three rivers, one directly impacted by a dam; the trophic structure of four fish species of four trophic guilds; and the relationship between the trophic state and land use with trophic structure. We found a greater total allochthonous contribution in the dam-regulated river in contrast to its tributaries, along with less natural cover in the riparian zone, but a high percentage of natural vegetation on the islands. Additionally, we observed greater contribution of the riverine sources for all three rivers, independent of the trophic state and natural cover of the river. The trophic position was greater for the fish in the river in a protected area and lower in the rivers with a high percentage of agropastoral activities in the riparian areas. These findings show the importance of the conservation of the riverine zones mainly in dam-regulated rivers, because this vegetation provides the main energy source by fish. |
| format | Article |
| id | doaj-art-ab4f6947b572401fa7d7876a8e2ecf4f |
| institution | Kabale University |
| issn | 1982-0224 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj-art-ab4f6947b572401fa7d7876a8e2ecf4f2024-11-12T07:42:11ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02242024-10-0122310.1590/1982-0224-2023-0084Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplainVinícius de Andrade Urbanohttps://orcid.org/0000-0001-6578-0181Driele Delanira-Santoshttps://orcid.org/0000-0002-5422-1373Matheus Maximilian Ratz Scoarizehttps://orcid.org/0000-0003-3234-9808Evanilde Beneditohttps://orcid.org/0000-0002-3494-9949Abstract Landscape change caused by hydropower dam construction and invasion of agriculture in the riparian zone has been a catalyst for alterations in fish food web dynamics. The objectives of this study were to investigate the trophic state and land use of three rivers, one directly impacted by a dam; the trophic structure of four fish species of four trophic guilds; and the relationship between the trophic state and land use with trophic structure. We found a greater total allochthonous contribution in the dam-regulated river in contrast to its tributaries, along with less natural cover in the riparian zone, but a high percentage of natural vegetation on the islands. Additionally, we observed greater contribution of the riverine sources for all three rivers, independent of the trophic state and natural cover of the river. The trophic position was greater for the fish in the river in a protected area and lower in the rivers with a high percentage of agropastoral activities in the riparian areas. These findings show the importance of the conservation of the riverine zones mainly in dam-regulated rivers, because this vegetation provides the main energy source by fish.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252024000300212&lng=en&tlng=enLand use changeOligotrophicationStable isotopesWetland |
| spellingShingle | Vinícius de Andrade Urbano Driele Delanira-Santos Matheus Maximilian Ratz Scoarize Evanilde Benedito Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain Neotropical Ichthyology Land use change Oligotrophication Stable isotopes Wetland |
| title | Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain |
| title_full | Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain |
| title_fullStr | Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain |
| title_full_unstemmed | Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain |
| title_short | Dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain |
| title_sort | dams and agricultural lands affect energy sources and the trophic position of fish in a floodplain |
| topic | Land use change Oligotrophication Stable isotopes Wetland |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252024000300212&lng=en&tlng=en |
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