Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil

FREITAS, Tiago Magalhães da Silva; ALMEIDA, Vitor Hudson da Consolação; VALENTE, Roberta de Melo; MONTAG, Luciano Fogaça de Assis

Artigo

Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil

Feeding habits of the midnight catfish Auchenipterichthys longimanus collected in rivers of the Caxiuanã National Forest (Eastern Amazonia, Brazil) were investigated through the different hydrological periods (dry, filing, flood and drawdown). A total of 589 specimens were collected throughout seven...

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Autor principal:	FREITAS, Tiago Magalhães da Silva
Outros Autores:	ALMEIDA, Vitor Hudson da Consolação, VALENTE, Roberta de Melo, MONTAG, Luciano Fogaça de Assis
Grau:	Artigo
Idioma:	eng
Publicado em:	2014
Assuntos:	Bagre Hábito alimentar Auchenipterichthys longimanus Floresta Nacional de Caxiuanã - PA Amazônia oriental Mata ciliar Ecologia trófica Catfish Estação hidrológica
Acesso em linha:	http://repositorio.ufpa.br/jspui/handle/2011/5144

id	ir-2011-5144
recordtype	dspace
spelling	ir-2011-51442018-12-20T13:59:30Z Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil FREITAS, Tiago Magalhães da Silva ALMEIDA, Vitor Hudson da Consolação VALENTE, Roberta de Melo MONTAG, Luciano Fogaça de Assis Bagre Hábito alimentar Auchenipterichthys longimanus Floresta Nacional de Caxiuanã - PA Amazônia oriental Mata ciliar Ecologia trófica Catfish Estação hidrológica Feeding habits of the midnight catfish Auchenipterichthys longimanus collected in rivers of the Caxiuanã National Forest (Eastern Amazonia, Brazil) were investigated through the different hydrological periods (dry, filing, flood and drawdown). A total of 589 specimens were collected throughout seven samplings between July 2008 and July 2009, of which 74 were young males, 177 adult males, 89 young females and 249 adult females. The diet composition (Alimentary index – Ai%) was analyzed by a non-metric multidimensional scaling (nMDS) and by the analysis of similarity (ANOSIM), which included 37 items grouped into nine categories (Aquatic insects, Other aquatic invertebrates, Arthropods fragment, Fish, Plant fragment, Seeds, Terrestrial insects, Other terrestrial invertebrates, and Terrestrial vertebrates). We also calculated the niche breadth (Levins index) and the repletion index (RI%). Differences in the diet composition between hydrological seasons were registered, primarily on diet composition between dry and flood season, but changes related with sex and maturity were not observed. The midnight catfish showed more specialists feeder habit in the flood period (March 2009) and more generalist habits in the dry season (November 2008). The amount of food eaten by A. longimanus based on repletion index (RI%), did not differ significantly from sex and maturity. However, we evidenced differences in RI% when comparing the studied months. These results provide important biological information about the trophic ecology of auchenipterids fish. In view of the higher occurrence of allochthonous items, this research also underpins the importance of riparian forests as critical environments in the maintenance and conservation of wild populations of fish in the Amazon basin. Neste estudo foram investigados os hábitos alimentares do bagre Auchenipterichthys longimanus coletados em rios da Floresta Nacional de Caxiuanã (Amazônia Oriental, Brasil) ao longo de diferentes períodos hidrológicos (seco, enchendo, cheio e vazando). Foram coletados 589 espécimes durante sete amostragens, entre julho de 2008 e julho de 2009, dos quais 74eram machos jovens, 177 machos adultos, 89 fêmeas jovens e 249 fêmeas adultas. A composição da dieta, analisada pelo Índice de Importância Alimentar (IAi%) foi avaliada por um escalonamento multidimensional não-métrico (nMDS) e pela análise de similaridade (ANOSIM), que incluiu 37 itens alimentares agrupados em nove categorias (insetos aquáticos, outros invertebrados aquáticos, fragmento de artrópodes, peixe, fragmento de planta, sementes, insetos terrestres, outros invertebrados terrestrese vertebrados terrestres). Também foram obtidos a amplitude de nicho (Índice de Levins) e o Índice de Repleção (IR%) da dieta do bagre. Foram observadas diferenças na composição da dieta entre os períodos hidrológicos, principalmente relacionada à estação seca e cheia, mas não houve variação na composição da dieta entre os sexos e maturidade. No período de cheia (especificamente no mês de março/2009) o bagre mostrou uma alimentação mais especialista enquanto que no período de seca (novembro/2008) os valores de amplitude de nicho classificaram-no com hábitos mais generalistas quanto a alimentação. A quantidade de alimentos ingeridos por A. longimanus com base no Índice de Repleção (IR%), não diferiram significativamente entre o sexo e maturidade. No entanto, foram evidenciadas diferenças quando comparados os meses estudados. Estes resultados fornecem informações biológicas importantes sobre a ecologia trófica de peixes da família Auchenipteridae. Tendo em vista a maior ocorrência de itens alóctones na dieta deste bagre, esta pesquisa também reforça a importância das matas ciliares em ambientes críticos na manutenção e conservação das populações selvagens de peixes na bacia amazônica. 2014-06-25T17:36:40Z 2014-06-25T17:36:40Z 2011 Artigo de Periódico FREITAS, Tiago Magalhães da Silva et al. Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil. Neotropical Ichthyology, Porto Alegre, v. 9, n. 3, p. 629-636, 2011. Disponível em: <http://www.scielo.br/pdf/ni/v9n3/aop3211.pdf>. Acesso em: 07 fev. 2014. <http://dx.doi.org/10.1590/S1679-62252011005000032>. 1679-6225 http://repositorio.ufpa.br/jspui/handle/2011/5144 eng Acesso Aberto application/pdf
institution	Repositório Institucional - Universidade Federal do Pará
collection	RI-UFPA
language	eng
topic	Bagre Hábito alimentar Auchenipterichthys longimanus Floresta Nacional de Caxiuanã - PA Amazônia oriental Mata ciliar Ecologia trófica Catfish Estação hidrológica
spellingShingle	Bagre Hábito alimentar Auchenipterichthys longimanus Floresta Nacional de Caxiuanã - PA Amazônia oriental Mata ciliar Ecologia trófica Catfish Estação hidrológica FREITAS, Tiago Magalhães da Silva Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil
topic_facet	Bagre Hábito alimentar Auchenipterichthys longimanus Floresta Nacional de Caxiuanã - PA Amazônia oriental Mata ciliar Ecologia trófica Catfish Estação hidrológica
description	Feeding habits of the midnight catfish Auchenipterichthys longimanus collected in rivers of the Caxiuanã National Forest (Eastern Amazonia, Brazil) were investigated through the different hydrological periods (dry, filing, flood and drawdown). A total of 589 specimens were collected throughout seven samplings between July 2008 and July 2009, of which 74 were young males, 177 adult males, 89 young females and 249 adult females. The diet composition (Alimentary index – Ai%) was analyzed by a non-metric multidimensional scaling (nMDS) and by the analysis of similarity (ANOSIM), which included 37 items grouped into nine categories (Aquatic insects, Other aquatic invertebrates, Arthropods fragment, Fish, Plant fragment, Seeds, Terrestrial insects, Other terrestrial invertebrates, and Terrestrial vertebrates). We also calculated the niche breadth (Levins index) and the repletion index (RI%). Differences in the diet composition between hydrological seasons were registered, primarily on diet composition between dry and flood season, but changes related with sex and maturity were not observed. The midnight catfish showed more specialists feeder habit in the flood period (March 2009) and more generalist habits in the dry season (November 2008). The amount of food eaten by A. longimanus based on repletion index (RI%), did not differ significantly from sex and maturity. However, we evidenced differences in RI% when comparing the studied months. These results provide important biological information about the trophic ecology of auchenipterids fish. In view of the higher occurrence of allochthonous items, this research also underpins the importance of riparian forests as critical environments in the maintenance and conservation of wild populations of fish in the Amazon basin.
format	Artigo
author	FREITAS, Tiago Magalhães da Silva
author2	ALMEIDA, Vitor Hudson da Consolação VALENTE, Roberta de Melo MONTAG, Luciano Fogaça de Assis
author2Str	ALMEIDA, Vitor Hudson da Consolação VALENTE, Roberta de Melo MONTAG, Luciano Fogaça de Assis
title	Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil
title_short	Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil
title_full	Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil
title_fullStr	Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil
title_full_unstemmed	Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil
title_sort	feeding ecology of auchenipterichthys longimanus (siluriformes: auchenipteridae) in a riparian flooded forest of eastern amazonia, brazil
publishDate	2014
url	http://repositorio.ufpa.br/jspui/handle/2011/5144
_version_	1832604022614261760
score	11.755432

Feeding ecology of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) in a riparian flooded forest of Eastern Amazonia, Brazil

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