Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the upper Paraná river floodplain
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Outros Autores: | , |
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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Brazilian Journal of Biology |
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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 |
_version_ |
1752129874771836928 |