2007
DOI: 10.1590/s0073-47212007000100002
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Abstract: ABSTRACT. Feeding opportunism of Knodus moenkhausii (Teleostei, Characidae): an abundant species in streams of the northwestern in the state of São Paulo, Brazil. In the present investigation we studied the feeding biology of Knodus moenkhausii (Eigenmann & Kennedy, 1903) in streams of the Upper Paraná river system in the state of São Paulo. In eight streams (R1-R8), K. moenkhausii consumed 18 items, of which algae, ephemeropteran nymphs, and dipteran larvae were the most frequent and dominant autochthonous i… Show more

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Cited by 45 publications
(44 citation statements)
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“…As well as in other studies in upper rio Paraná system, including Distrito Federal (Aquino et al, 2009) and São Paulo State (Casatti et al, 2006b;Ceneviva-Bastos & Casatti, 2007), K. moenkhausii was registered as the most abundant species. According to Langeani et al (2007), this species is not originally from the upper Paraná drainage, and its introduction may be related to Itaipu dam construction, finished in 1982 (Agostinho et al, 2007).…”
Section: Discussionsupporting
confidence: 80%
“…As well as in other studies in upper rio Paraná system, including Distrito Federal (Aquino et al, 2009) and São Paulo State (Casatti et al, 2006b;Ceneviva-Bastos & Casatti, 2007), K. moenkhausii was registered as the most abundant species. According to Langeani et al (2007), this species is not originally from the upper Paraná drainage, and its introduction may be related to Itaipu dam construction, finished in 1982 (Agostinho et al, 2007).…”
Section: Discussionsupporting
confidence: 80%
“…This is partly explained by the predominance of two characins P. argentea and Knodus sp., which represent 52.4% of the total abundance. This predominance is related to a narrow channel (average = 2.44 m) in conjuction with the substitution of riparian vegetation by pastures which favor species with opportunist alimentary habits, such as, P. argentea (Ferreira et al, 2002) and Knodus genus species (Ceneviva-Bastos & Casatti, 2007). Moreover, the former species is common in perturbed environments (Ferreira et al, 2002;Santos et al, 2004) and possesses diurnal alimentary habits (Fialho & Tejerina-Garro, 2004), a characteristic which may have influenced its capture.…”
Section: Discussionmentioning
confidence: 99%
“…Um exemplo que merece destaque é Knodus moenkhausii, que foi a espécie de maior abundância, contribuindo com mais da metade do número de indivíduos coletados. Em estudos recentes, essa dominância vem sendo continuamente observada em riachos da bacia do Alto Paraná (Castro et al 2005, Casatti et al 2006) e é explicada pelo oportunismo alimentar, que lhe garante permanentes fontes de energia, a qual boa parte é alocada para reprodução, permitindo a ocorrência dessa espécie até mesmo em ambientes impactados (Ceneviva-Bastos & Casatti 2007).…”
Section: Discussionunclassified