Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil
This study aims to characterize the spatial and seasonal distribution of the fish assemblage and evaluate the integrity of streams in a sustainable use area that includes integral protection conservation units in Distrito Federal, Central Brazil (Cerrado biome). For the study, 12 stretches of 8 stre...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
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| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200023&lng=en&tlng=en |
| _version_ | 1819068446638342144 |
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| author | Thiago Belisário d'Araújo Couto Pedro De Podestà Uchôa de Aquino |
| author_facet | Thiago Belisário d'Araújo Couto Pedro De Podestà Uchôa de Aquino |
| author_sort | Thiago Belisário d'Araújo Couto |
| collection | DOAJ |
| description | This study aims to characterize the spatial and seasonal distribution of the fish assemblage and evaluate the integrity of streams in a sustainable use area that includes integral protection conservation units in Distrito Federal, Central Brazil (Cerrado biome). For the study, 12 stretches of 8 streams were sampled in 2008 (dry season) and 2009 (wet season). For that evaluation was estimated the Physical Habitat Index (PHI), vegetation cover (VC), pH, dissolved oxygen, turbidity, and conductivity. We recorded 22 species, about eight undescribed species, by a total of 2,327 individuals. The most representative families in number of species were Characidae (31.8%), Loricariidae (31.8%), and Crenuchidae (13.6%). Knodus moenkhausii was the most abundant species with 1,476 individuals, added to Astyanax sp., Phalloceros harpagos, and Hasemania sp. they represent over 95% of the total abundance. The species Astyanax sp. (occurring in 79.2% of the stretches) and K. moenkhausii (50.0%) were considered constant in both seasons. The longitudinal gradient (River Continuum) exerts a strong influence on the studied assemblage. According to CCA, the variables that structure the fish assemblage are based on aspects related to water volume and habitat complexity. No seasonal variation in richness, diversity, abundance, and mass were detected. A cluster analysis suggests a separation of species composition between the stretches of higher and lower orders, which was not observed for seasonality. The streams were considered well preserved (mean PHI 82.9±7.5%), but in some stretches were observed anthropogenic influence, detected in the water quality and, mainly, on the riparian vegetation integrity. The exotic species Poecilia reticulata was sampled in the two stretches considered most affected by anthropogenic activities by PHI, conductivity, and VC. |
| first_indexed | 2024-12-21T16:34:17Z |
| format | Article |
| id | doaj.art-655c8c0f7a4e4fb6a7aaab0ab34b9a37 |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-12-21T16:34:17Z |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-655c8c0f7a4e4fb6a7aaab0ab34b9a372022-12-21T18:57:16ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02249244545410.1590/S1679-62252011000200023S1679-62252011000200023Structure and integrity of fish assemblages in streams associated to conservation units in Central BrazilThiago Belisário d'Araújo Couto0Pedro De Podestà Uchôa de Aquino1Universidade de BrasíliaUniversidade de BrasíliaThis study aims to characterize the spatial and seasonal distribution of the fish assemblage and evaluate the integrity of streams in a sustainable use area that includes integral protection conservation units in Distrito Federal, Central Brazil (Cerrado biome). For the study, 12 stretches of 8 streams were sampled in 2008 (dry season) and 2009 (wet season). For that evaluation was estimated the Physical Habitat Index (PHI), vegetation cover (VC), pH, dissolved oxygen, turbidity, and conductivity. We recorded 22 species, about eight undescribed species, by a total of 2,327 individuals. The most representative families in number of species were Characidae (31.8%), Loricariidae (31.8%), and Crenuchidae (13.6%). Knodus moenkhausii was the most abundant species with 1,476 individuals, added to Astyanax sp., Phalloceros harpagos, and Hasemania sp. they represent over 95% of the total abundance. The species Astyanax sp. (occurring in 79.2% of the stretches) and K. moenkhausii (50.0%) were considered constant in both seasons. The longitudinal gradient (River Continuum) exerts a strong influence on the studied assemblage. According to CCA, the variables that structure the fish assemblage are based on aspects related to water volume and habitat complexity. No seasonal variation in richness, diversity, abundance, and mass were detected. A cluster analysis suggests a separation of species composition between the stretches of higher and lower orders, which was not observed for seasonality. The streams were considered well preserved (mean PHI 82.9±7.5%), but in some stretches were observed anthropogenic influence, detected in the water quality and, mainly, on the riparian vegetation integrity. The exotic species Poecilia reticulata was sampled in the two stretches considered most affected by anthropogenic activities by PHI, conductivity, and VC.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200023&lng=en&tlng=enCerradoHabitat qualityHeadwatersUpper Paraná river |
| spellingShingle | Thiago Belisário d'Araújo Couto Pedro De Podestà Uchôa de Aquino Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil Neotropical Ichthyology Cerrado Habitat quality Headwaters Upper Paraná river |
| title | Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil |
| title_full | Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil |
| title_fullStr | Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil |
| title_full_unstemmed | Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil |
| title_short | Structure and integrity of fish assemblages in streams associated to conservation units in Central Brazil |
| title_sort | structure and integrity of fish assemblages in streams associated to conservation units in central brazil |
| topic | Cerrado Habitat quality Headwaters Upper Paraná river |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200023&lng=en&tlng=en |
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