2007
DOI: 10.1590/s0101-81752007000400016
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Abstract: Neste trabalho é descrita a estrutura populacional, os hábitos alimentares e a reprodução de Astyanax scabripinnis Jenyns, 1842, baseado em coletas realizadas mensalmente entre outubro de 1998 e setembro de 1999, em um riacho das cabeceiras do rio Iguaçu. A distribuição de freqüência por classe de comprimento revelou valores diferentes entre machos (5,4-6,7 cm) e fêmeas (6,1-8,1 cm). Foram encontradas diferenças significativas para os valores do fator de condição entre os sexos, o que pode implicar em diferent… Show more

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Cited by 20 publications
(16 citation statements)
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“…This study confirmed the insectivorous-omnivorous habit and feeding plasticity for both Astyanax species, as indicated by several other authors (e.g. Nomura, 1975;Arcifa et al, 1991;Uieda et al, 1997;Bennemann et al, 2006;Abilhoa, 2007) and also highlighted the insetivorous feeding habit, likewise displayed by other Astyanax species specially in streams and rivers (see Vilella et al, 2002 for A. eigenmanniorum;Vidotto-Magnoni &Carvalho, 2009 for A. altiparanae andFerreira et al, 2012 for A. paranae). At this context, diet dissimilarities between the Astyanax species were revealed mainly due to the source of itens consumed.…”
Section: Discussionsupporting
confidence: 89%
See 1 more Smart Citation
“…This study confirmed the insectivorous-omnivorous habit and feeding plasticity for both Astyanax species, as indicated by several other authors (e.g. Nomura, 1975;Arcifa et al, 1991;Uieda et al, 1997;Bennemann et al, 2006;Abilhoa, 2007) and also highlighted the insetivorous feeding habit, likewise displayed by other Astyanax species specially in streams and rivers (see Vilella et al, 2002 for A. eigenmanniorum;Vidotto-Magnoni &Carvalho, 2009 for A. altiparanae andFerreira et al, 2012 for A. paranae). At this context, diet dissimilarities between the Astyanax species were revealed mainly due to the source of itens consumed.…”
Section: Discussionsupporting
confidence: 89%
“…Astyanax parahybae diet, also at Lajes reservoir, is more focused on autochthonous items such as aquatic insects. Besides the contribution of allochthonous items, riparian vegetation also provides the permanence of aquatic insect larvae that feed, directly or indirectly, on allochthonous organic material imported from riparian vegetation (Castro, 1999;Abilhoa, 2007). This may emphasize the importance of ecotone landwater zone for fish forraging behavior ( Dias et al, 2005;Barreto & Aranha, 2006;Casatti, 2010).…”
Section: Discussionmentioning
confidence: 99%
“…Based on the hypothesis that the sexes are not susceptible to differential effects of birth, mortality and growth, the expected ratio is 1:1 (Nikolsky 1969;Vazzoler 1996), which was not observed for O. pequira, with predominance of females. The predominance of females is common in fish (Abilhoa 2007;Súarez et al 2009), and factors like predation and variation in local environmental conditions can be involved when a difference in the sex ratio occurs (Caramaschi and Mazzoni 1995;Garcia et al 2004). At the same time, the sex ratio observed over the months remained balanced with the greater proportion of females, little variation for almost all the months, confirming the predominance of females in the total proportion.…”
Section: Discussionmentioning
confidence: 91%
“…No entanto, a maioria dos estudos realizados com Astyanax encontrou uma reprodução sazonal ocorrendo na primavera e verão do hemisfério sul (entre setembro e março), com duração variando entre quatro e seis meses (NOMURA, 1975;BARBIERI et al, 1982BARBIERI et al, , 1996AGOSTINHO et al, 1984;RODRIGUES et al, 1989;BRAGA, 2001;ABILHOA, 2007).…”
Section: Resultsunclassified