Document Detail

Patterns of food resource use by two congeneric species of piranhas (Serrasalmus) on the Upper Paraná River floodplain.
MedLine Citation:
PMID:  14509839     Owner:  NLM     Status:  MEDLINE    
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.
C S Agostinho; N S Hahn; E E Marques
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Publication Detail:
Type:  Journal Article     Date:  2003-08-15
Journal Detail:
Title:  Brazilian journal of biology = Revista brasleira de biologia     Volume:  63     ISSN:  1519-6984     ISO Abbreviation:  Braz J Biol     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-09-26     Completed Date:  2003-12-23     Revised Date:  2007-09-06    
Medline Journal Info:
Nlm Unique ID:  101129542     Medline TA:  Braz J Biol     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  177-82     Citation Subset:  IM    
Núcleo de Estudos Ambientais (Neamb), Fundação Universidade do Tocantins, Setor Jardim dos Ipês, CEP 77500-000, Porto Nacional, Tocantins, Brazil.
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MeSH Terms
Fishes / physiology*
Food Habits / physiology*
Gastrointestinal Contents*

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