Trophic position of bottom-feeding fish in the Upper Paraná River floodplain
The δ15N composition of bottom-feeding fish (iliophagous = Apareiodon affinis, Cyphocharax nagelii, Prochilodus lineatus, Steindachnerina brevipinna and S. insculpta; detritivorous = Loricariichthys platymetopon and Liposarcus anisitsi; benthophagous = Satanoperca pappaterra and Hoplosternum littora...
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| Format: | Article |
| Language: | English |
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Instituto Internacional de Ecologia
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| Series: | Brazilian Journal of Biology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842009000300012&lng=en&tlng=en |
| _version_ | 1828749905996283904 |
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| author | CA. Lopes E. Benedito LA. Martinelli |
| author_facet | CA. Lopes E. Benedito LA. Martinelli |
| author_sort | CA. Lopes |
| collection | DOAJ |
| description | The δ15N composition of bottom-feeding fish (iliophagous = Apareiodon affinis, Cyphocharax nagelii, Prochilodus lineatus, Steindachnerina brevipinna and S. insculpta; detritivorous = Loricariichthys platymetopon and Liposarcus anisitsi; benthophagous = Satanoperca pappaterra and Hoplosternum littorale) and their primary food sources were investigated in the upper Paraná River floodplain during rainy seasons in different environments (lotic and lentic). Two hypotheses were tested: i) that the trophic position and isotopic values of the investigated organisms (fish and food resources) vary spatially; and ii) that trophic position and isotopic compositions differ among iliophagous, detritivorous and benthophagous fish. C4 macrophytes, periphyton and phytoplankton were isotopically different in sites analyzed. Significant isotopic differences occurred in the species of each trophic category. Spatial differences were observed in the isotopic composition of P. lineatus and L. platymetopon, whose values were more enriched in the Paraná River and Pau Véio Lake. Significant spatial differences in trophic position were observed for L. platymetopon and H. littorale, which presented the highest values in the Paraná and Baía rivers, respectively. Trophic positions were significantly different among the species that composed each trophic category. These findings demonstrate that in energy-flow studies in detrital food chains generalizations concerning the grouping of fish into trophic categories and/or habitats should only be carried out after careful investigations of the local/specific trophic dynamics of the organisms. |
| first_indexed | 2024-12-10T20:30:16Z |
| format | Article |
| id | doaj.art-b0ebeadbdc414e9b9c6b472c60209974 |
| institution | Directory Open Access Journal |
| issn | 1678-4375 |
| language | English |
| last_indexed | 2024-12-10T20:30:16Z |
| publisher | Instituto Internacional de Ecologia |
| record_format | Article |
| series | Brazilian Journal of Biology |
| spelling | doaj.art-b0ebeadbdc414e9b9c6b472c602099742022-12-22T01:34:43ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-4375692 suppl57358110.1590/S1519-69842009000300012S1519-69842009000300012Trophic position of bottom-feeding fish in the Upper Paraná River floodplainCA. Lopes0E. Benedito1LA. Martinelli2Universidade Estadual de MaringáUniversidade Estadual de MaringáUniversidade de São PauloThe δ15N composition of bottom-feeding fish (iliophagous = Apareiodon affinis, Cyphocharax nagelii, Prochilodus lineatus, Steindachnerina brevipinna and S. insculpta; detritivorous = Loricariichthys platymetopon and Liposarcus anisitsi; benthophagous = Satanoperca pappaterra and Hoplosternum littorale) and their primary food sources were investigated in the upper Paraná River floodplain during rainy seasons in different environments (lotic and lentic). Two hypotheses were tested: i) that the trophic position and isotopic values of the investigated organisms (fish and food resources) vary spatially; and ii) that trophic position and isotopic compositions differ among iliophagous, detritivorous and benthophagous fish. C4 macrophytes, periphyton and phytoplankton were isotopically different in sites analyzed. Significant isotopic differences occurred in the species of each trophic category. Spatial differences were observed in the isotopic composition of P. lineatus and L. platymetopon, whose values were more enriched in the Paraná River and Pau Véio Lake. Significant spatial differences in trophic position were observed for L. platymetopon and H. littorale, which presented the highest values in the Paraná and Baía rivers, respectively. Trophic positions were significantly different among the species that composed each trophic category. These findings demonstrate that in energy-flow studies in detrital food chains generalizations concerning the grouping of fish into trophic categories and/or habitats should only be carried out after careful investigations of the local/specific trophic dynamics of the organisms.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842009000300012&lng=en&tlng=enbottom-feeding fishtrophic positionnitrogen stable isotopeUpper Paraná River floodplain |
| spellingShingle | CA. Lopes E. Benedito LA. Martinelli Trophic position of bottom-feeding fish in the Upper Paraná River floodplain Brazilian Journal of Biology bottom-feeding fish trophic position nitrogen stable isotope Upper Paraná River floodplain |
| title | Trophic position of bottom-feeding fish in the Upper Paraná River floodplain |
| title_full | Trophic position of bottom-feeding fish in the Upper Paraná River floodplain |
| title_fullStr | Trophic position of bottom-feeding fish in the Upper Paraná River floodplain |
| title_full_unstemmed | Trophic position of bottom-feeding fish in the Upper Paraná River floodplain |
| title_short | Trophic position of bottom-feeding fish in the Upper Paraná River floodplain |
| title_sort | trophic position of bottom feeding fish in the upper parana river floodplain |
| topic | bottom-feeding fish trophic position nitrogen stable isotope Upper Paraná River floodplain |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842009000300012&lng=en&tlng=en |
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