Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin
Abstract The structure of fish assemblages in Neotropical rivers is influenced by a series of environmental, spatial and/or temporal factors, given that different species will occupy the habitats that present the most favourable conditions to their survival. The present study aims to identify the pr...
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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=S1519-69842015000500078&lng=en&tlng=en |
| _version_ | 1818335182230388736 |
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| author | TAP Barbosa NL Benone TOR Begot A Gonçalves L Sousa T Giarrizzo L Juen LFA Montag |
| author_facet | TAP Barbosa NL Benone TOR Begot A Gonçalves L Sousa T Giarrizzo L Juen LFA Montag |
| author_sort | TAP Barbosa |
| collection | DOAJ |
| description | Abstract The structure of fish assemblages in Neotropical rivers is influenced by a series of environmental, spatial and/or temporal factors, given that different species will occupy the habitats that present the most favourable conditions to their survival. The present study aims to identify the principal factors responsible for the structuring of the fish assemblages found in the middle Xingu River, examining the influence of environmental, spatial, and temporal factors, in addition to the presence of natural barriers (waterfalls). For this, data were collected every three months between July 2012 and April 2013, using gillnets of different sizes and meshes. In addition to biotic data, 17 environmental variables were measured. A total of 8,485 fish specimens were collected during the study, representing 188 species. Total dissolved solids, conductivity, total suspended matter, and dissolved oxygen concentrations were the variables that had the greatest influence on the characteristics of the fish fauna of the middle Xingu. Only the barriers and hydrological periods played a significant deterministic role, resulting in both longitudinal and lateral gradients. This emphasizes the role of the connectivity of the different habitats found within the study area in the structuring of its fish assemblages. |
| first_indexed | 2024-12-13T14:19:21Z |
| format | Article |
| id | doaj.art-9eab8006ae284029b9211ae2b4a5e15c |
| institution | Directory Open Access Journal |
| issn | 1678-4375 |
| language | English |
| last_indexed | 2024-12-13T14:19:21Z |
| publisher | Instituto Internacional de Ecologia |
| record_format | Article |
| series | Brazilian Journal of Biology |
| spelling | doaj.art-9eab8006ae284029b9211ae2b4a5e15c2022-12-21T23:42:08ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-4375753 suppl 1789410.1590/1519-6984.00214BMS1519-69842015000500078Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basinTAP BarbosaNL BenoneTOR BegotA GonçalvesL SousaT GiarrizzoL JuenLFA MontagAbstract The structure of fish assemblages in Neotropical rivers is influenced by a series of environmental, spatial and/or temporal factors, given that different species will occupy the habitats that present the most favourable conditions to their survival. The present study aims to identify the principal factors responsible for the structuring of the fish assemblages found in the middle Xingu River, examining the influence of environmental, spatial, and temporal factors, in addition to the presence of natural barriers (waterfalls). For this, data were collected every three months between July 2012 and April 2013, using gillnets of different sizes and meshes. In addition to biotic data, 17 environmental variables were measured. A total of 8,485 fish specimens were collected during the study, representing 188 species. Total dissolved solids, conductivity, total suspended matter, and dissolved oxygen concentrations were the variables that had the greatest influence on the characteristics of the fish fauna of the middle Xingu. Only the barriers and hydrological periods played a significant deterministic role, resulting in both longitudinal and lateral gradients. This emphasizes the role of the connectivity of the different habitats found within the study area in the structuring of its fish assemblages.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842015000500078&lng=en&tlng=ennatural barriersconnectivityhydrological periodscommunity ecologyimpacts of hydroelectric dams |
| spellingShingle | TAP Barbosa NL Benone TOR Begot A Gonçalves L Sousa T Giarrizzo L Juen LFA Montag Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin Brazilian Journal of Biology natural barriers connectivity hydrological periods community ecology impacts of hydroelectric dams |
| title | Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin |
| title_full | Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin |
| title_fullStr | Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin |
| title_full_unstemmed | Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin |
| title_short | Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin |
| title_sort | effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle xingu river in the eastern amazon basin |
| topic | natural barriers connectivity hydrological periods community ecology impacts of hydroelectric dams |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842015000500078&lng=en&tlng=en |
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