Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin
ABSTRACT Chalceus guaporensis is an endemic fish to the upper Madeira River whereas C. epakros is widespread in many rivers of the central and lower portions of the Amazon Basin, middle and upper Orinoco River Basin, the Essequibo River in Guyana and in the Nanay River in northern Peru. According to...
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| Format: | Article |
| Language: | English |
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Instituto Nacional de Pesquisas da Amazônia
2018-09-01
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| Series: | Acta Amazonica |
| Subjects: | |
| Online Access: | http://www.scielo.br/pdf/aa/v48n3/1809-4392-aa-48-03-239.pdf |
| _version_ | 1818743738762002432 |
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| author | Gislene TORRENTE-VILARA Ariana CELLA-RIBEIRO Marília HAUSER Cristhiana RÖPKE Maria Helena FREITAS Carolina Rodrigues da Costa DORIA Jansen ZUANON |
| author_facet | Gislene TORRENTE-VILARA Ariana CELLA-RIBEIRO Marília HAUSER Cristhiana RÖPKE Maria Helena FREITAS Carolina Rodrigues da Costa DORIA Jansen ZUANON |
| author_sort | Gislene TORRENTE-VILARA |
| collection | DOAJ |
| description | ABSTRACT Chalceus guaporensis is an endemic fish to the upper Madeira River whereas C. epakros is widespread in many rivers of the central and lower portions of the Amazon Basin, middle and upper Orinoco River Basin, the Essequibo River in Guyana and in the Nanay River in northern Peru. According to literature, both species do not occur in syntopy. We carried out ichthyological surveys along the Madeira River Basin and its rapids, and data on abundance, diet and habitat use were obtained for both species. Chalceus guaporensis and C. epakros are morphologically similar, occupying floodplain habitats and exploiting similar food resources. The former predominated upstream from the Jirau Fall, whereas the latter had most of its abundance bellow the last fall of the Madeira River; both species co-occurred along part of the rapids stretch and in the Machado River, but with strongly uneven abundances. This pattern may have developed in the past by speciation regarding the presence of the falls, while co-occurrence of the two species seems to be regulated by competitive interactions or maintained by slight differences in environmental requirements nowadays. The recent disruption of the Madeira River by two run-of-river dams built in cascade submerged a large portion of the rapids stretch and substituted it by semi-lenthic habitats created by the dam reservoirs, together with the construction of a fish passage. These environmental changes may allow the invasion of the upper reaches of the Madeira River by C. epakros, and disturb the population of endemic C. guaporensis. |
| first_indexed | 2024-12-18T02:33:11Z |
| format | Article |
| id | doaj.art-acde36761bcb49a9838f84804f02ec72 |
| institution | Directory Open Access Journal |
| issn | 0044-5967 |
| language | English |
| last_indexed | 2024-12-18T02:33:11Z |
| publishDate | 2018-09-01 |
| publisher | Instituto Nacional de Pesquisas da Amazônia |
| record_format | Article |
| series | Acta Amazonica |
| spelling | doaj.art-acde36761bcb49a9838f84804f02ec722022-12-21T21:23:50ZengInstituto Nacional de Pesquisas da AmazôniaActa Amazonica0044-59672018-09-0148323924710.1590/1809-4392201703022Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon BasinGislene TORRENTE-VILARAAriana CELLA-RIBEIROMarília HAUSERCristhiana RÖPKEMaria Helena FREITASCarolina Rodrigues da Costa DORIAJansen ZUANONABSTRACT Chalceus guaporensis is an endemic fish to the upper Madeira River whereas C. epakros is widespread in many rivers of the central and lower portions of the Amazon Basin, middle and upper Orinoco River Basin, the Essequibo River in Guyana and in the Nanay River in northern Peru. According to literature, both species do not occur in syntopy. We carried out ichthyological surveys along the Madeira River Basin and its rapids, and data on abundance, diet and habitat use were obtained for both species. Chalceus guaporensis and C. epakros are morphologically similar, occupying floodplain habitats and exploiting similar food resources. The former predominated upstream from the Jirau Fall, whereas the latter had most of its abundance bellow the last fall of the Madeira River; both species co-occurred along part of the rapids stretch and in the Machado River, but with strongly uneven abundances. This pattern may have developed in the past by speciation regarding the presence of the falls, while co-occurrence of the two species seems to be regulated by competitive interactions or maintained by slight differences in environmental requirements nowadays. The recent disruption of the Madeira River by two run-of-river dams built in cascade submerged a large portion of the rapids stretch and substituted it by semi-lenthic habitats created by the dam reservoirs, together with the construction of a fish passage. These environmental changes may allow the invasion of the upper reaches of the Madeira River by C. epakros, and disturb the population of endemic C. guaporensis.http://www.scielo.br/pdf/aa/v48n3/1809-4392-aa-48-03-239.pdfAlestidaecoexistencebiologygeographical barriermuddy water |
| spellingShingle | Gislene TORRENTE-VILARA Ariana CELLA-RIBEIRO Marília HAUSER Cristhiana RÖPKE Maria Helena FREITAS Carolina Rodrigues da Costa DORIA Jansen ZUANON Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin Acta Amazonica Alestidae coexistence biology geographical barrier muddy water |
| title | Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin |
| title_full | Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin |
| title_fullStr | Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin |
| title_full_unstemmed | Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin |
| title_short | Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin |
| title_sort | spatial segregation between chalceus guaporensis and chalceus epakros osteichthyes characiformes in the madeira river amazon basin |
| topic | Alestidae coexistence biology geographical barrier muddy water |
| url | http://www.scielo.br/pdf/aa/v48n3/1809-4392-aa-48-03-239.pdf |
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