Formação de cardumes por Astyanax altiparanae (Teleostei: Characidae) no Rio Congonhas, Paraná, Brasil

Foi observado o comportamento de formação de cardumes de Astyanax altiparanae Garutti & Britski, 2000 no subafluente do médio rio Paranapanema, durante o período de janeiro de 1997 a fevereiro de 1998. Foi constatado que essa espécie forma basicamente dois tipos de cardumes: os maiores (aproxima...

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Published inRevista brasileira de zoologia Vol. 25; no. 3; pp. 566 - 569
Main Authors Suzuki, Fábio M., Orsi, Mário L.
Format Journal Article
LanguageEnglish
Published 01.09.2008
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Abstract Foi observado o comportamento de formação de cardumes de Astyanax altiparanae Garutti & Britski, 2000 no subafluente do médio rio Paranapanema, durante o período de janeiro de 1997 a fevereiro de 1998. Foi constatado que essa espécie forma basicamente dois tipos de cardumes: os maiores (aproximadamente 50 indivíduos) formados pelos menores espécimes e localizando-se à margem, entre a vegetação aquática; enquanto os menores cardumes (cerca de 15 indivíduos), formados por espécimes maiores, localizam-se, preferencialmente, em áreas mais profundas. Foram evidenciadas algumas variações comportamentais (organização e localização) entre esses dois grupos dependendo do tipo de atividade realizada como, freqüência de deslocamento e forrageamento. O comportamento observado desses cardumes ante ao sinal de ameaça reforça a idéia de que a formação de cardumes é, também, uma tática anti-predatória. The schooling behavior of Astyanax altiparanae Garutti & Britski, 2000, was observed in a subtributary of the mid-Paranapanema River from January 1998 to February 1999. This species was shown to form two types of school: large schools, with approximately 50 individuals, were formed by smaller specimens located near the margin, around aquatic vegetation; and small schools (around 15 individuals), composed of larger specimens living preferentially in areas of deep water. Some behavioral variations in organization and localization were observed between these two groups, depending on the type of conducted activity, such as displacement frequency and foraging. The observed behavior of these schools when under threat underscores the idea that schooling is also an antipredation tactic.
AbstractList Foi observado o comportamento de formação de cardumes de Astyanax altiparanae Garutti & Britski, 2000 no subafluente do médio rio Paranapanema, durante o período de janeiro de 1997 a fevereiro de 1998. Foi constatado que essa espécie forma basicamente dois tipos de cardumes: os maiores (aproximadamente 50 indivíduos) formados pelos menores espécimes e localizando-se à margem, entre a vegetação aquática; enquanto os menores cardumes (cerca de 15 indivíduos), formados por espécimes maiores, localizam-se, preferencialmente, em áreas mais profundas. Foram evidenciadas algumas variações comportamentais (organização e localização) entre esses dois grupos dependendo do tipo de atividade realizada como, freqüência de deslocamento e forrageamento. O comportamento observado desses cardumes ante ao sinal de ameaça reforça a idéia de que a formação de cardumes é, também, uma tática anti-predatória. The schooling behavior of Astyanax altiparanae Garutti & Britski, 2000, was observed in a subtributary of the mid-Paranapanema River from January 1998 to February 1999. This species was shown to form two types of school: large schools, with approximately 50 individuals, were formed by smaller specimens located near the margin, around aquatic vegetation; and small schools (around 15 individuals), composed of larger specimens living preferentially in areas of deep water. Some behavioral variations in organization and localization were observed between these two groups, depending on the type of conducted activity, such as displacement frequency and foraging. The observed behavior of these schools when under threat underscores the idea that schooling is also an antipredation tactic.
Author Suzuki, Fábio M.
Orsi, Mário L.
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10.1007/BF00612563
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