Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain

Detalhes bibliográficos
Autor(a) principal: Agostinho,C. S.
Data de Publicação: 2003
Outros Autores: Hahn,N. S., Marques,E. E.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Brazilian Journal of Biology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000200002
Resumo: Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05), with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.
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spelling Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplainfeedingfeeding rhythmspecies introductionSerrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05), with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.Instituto Internacional de Ecologia2003-05-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000200002Brazilian Journal of Biology v.63 n.2 2003reponame:Brazilian Journal of Biologyinstname:Instituto Internacional de Ecologia (IIE)instacron:IIE10.1590/S1519-69842003000200002info:eu-repo/semantics/openAccessAgostinho,C. S.Hahn,N. S.Marques,E. E.eng2003-08-15T00:00:00Zoai:scielo:S1519-69842003000200002Revistahttps://www.scielo.br/j/bjb/https://old.scielo.br/oai/scielo-oai.phpbjb@bjb.com.br||bjb@bjb.com.br1678-43751519-6984opendoar:2003-08-15T00:00Brazilian Journal of Biology - Instituto Internacional de Ecologia (IIE)false
dc.title.none.fl_str_mv Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
title Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
spellingShingle Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
Agostinho,C. S.
feeding
feeding rhythm
species introduction
title_short Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
title_full Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
title_fullStr Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
title_full_unstemmed Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
title_sort Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
author Agostinho,C. S.
author_facet Agostinho,C. S.
Hahn,N. S.
Marques,E. E.
author_role author
author2 Hahn,N. S.
Marques,E. E.
author2_role author
author
dc.contributor.author.fl_str_mv Agostinho,C. S.
Hahn,N. S.
Marques,E. E.
dc.subject.por.fl_str_mv feeding
feeding rhythm
species introduction
topic feeding
feeding rhythm
species introduction
description Serrasalmus marginatus invaded the Upper Paraná River after construction of the Itaipu Dam in November 1982. This was followed by a reduction in abundance of the native species S. spilopleura. Analysis of the pattern of food resource use revealed that both species employ the same feeding strategy, eating mainly fish (whole fish or muscle fragments) and fins bitten off their prey. The diurnal activity period and the feeding rhythm were better-defined in S. marginatus. For young individuals of both species, food was taken in a significantly discontinuous manner (F = 2.83; p < 0.05 and F = 13.25; p < 0.05), with a peak at 4 p.m. Ontogenetic differences in diet, the strong feeding overlap of larger individuals of S. marginatus and smaller individuals of S. spilopleura, and the aggressiveness of S. marginatus in establishing feeding territories may have contributed to the success of the invading species.
publishDate 2003
dc.date.none.fl_str_mv 2003-05-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000200002
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000200002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1519-69842003000200002
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto Internacional de Ecologia
publisher.none.fl_str_mv Instituto Internacional de Ecologia
dc.source.none.fl_str_mv Brazilian Journal of Biology v.63 n.2 2003
reponame:Brazilian Journal of Biology
instname:Instituto Internacional de Ecologia (IIE)
instacron:IIE
instname_str Instituto Internacional de Ecologia (IIE)
instacron_str IIE
institution IIE
reponame_str Brazilian Journal of Biology
collection Brazilian Journal of Biology
repository.name.fl_str_mv Brazilian Journal of Biology - Instituto Internacional de Ecologia (IIE)
repository.mail.fl_str_mv bjb@bjb.com.br||bjb@bjb.com.br
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