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Spatial segregation between Chalceus guaporensis and Chalceus epakros (Osteichthyes: Characiformes) in the Madeira River, Amazon Basin

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Autor(es):
Torrente-Vilara, Gislene [1, 2, 3] ; Cella-Ribeiro, Ariana [3, 4] ; Hauser, Marilia [3, 4] ; Ropke, Cristhiana [5] ; Freitas, Maria Helena [5] ; da Costa Doria, Carolina Rodrigues [3, 4] ; Zuanon, Jansen [5]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Fed Sao Paulo, Dept Ciencias Mar, Campus Baixada Santista, BR-11070100 Santos, SP - Brazil
[2] Univ Fed Amazonas, Av Gen Rodrigo Octavio Jordan 3000, Manaus, Amazonas - Brazil
[3] Univ Fed Rondonia, Posgrad Rede Biodiversidade & Biotecnol Amazonia, BR 364, Km 5-5, BR-76815800 Porto Velho, RO - Brazil
[4] Univ Fed Rondonia, BR 364, Km 9-5, BR-76815800 Porto Velho, RO - Brazil
[5] Inst Nacl de Pesquisas da Amazonia, Coordenacao Biodiversidade, Ave Andre Araujo 2936, BR-69067375 Manaus, Amazonas - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Acta Amazonica; v. 48, n. 3, p. 239-247, JUL-SEP 2018.
Citações Web of Science: 0
Resumo

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 die 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. (AU)

Processo FAPESP: 16/07910-0 - A sub-bacia do Rio Javari no contexto do projeto "Peixes amazônicos e mudanças climáticas - AMAZONFISH"
Beneficiário:Gislene Torrente Vilara
Linha de fomento: Auxílio à Pesquisa - Regular