2014
DOI: 10.1590/0001-3765201420130053
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Abstract: We investigated the niche breadth and overlap of the fish species occurring in four environments affected by the Coaracy Nunes reservoir, in the Amapá Brazilian State. Seasonal samples of fishes were taken using a standard configuration of gillnets, as well as dragnets, lines, and cast-nets. Five hundred and forty stomach contents, representing 47 fish species were analyzed and quantified. Niche breadth and overlap were estimated using indexes of Levins and Pianka, respectively, while interspecific competition… Show more

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Cited by 43 publications
(34 citation statements)
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References 32 publications
(24 reference statements)
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“…Some studies have evidence a more generalist diet during flood season (Luz- Agostinho et al 2008;Corrêa et al 2011), while others observed specialized diets during the same season (Sá-Oliveira et al 2014). Our results reinforce the hypothesis that there is no universal pattern in the exploitation of resources, but rather a variety of behavioral strategies related to the environmental characteristics of each system (Novakowski et al 2008).…”
Section: Discussionsupporting
confidence: 85%
“…Some studies have evidence a more generalist diet during flood season (Luz- Agostinho et al 2008;Corrêa et al 2011), while others observed specialized diets during the same season (Sá-Oliveira et al 2014). Our results reinforce the hypothesis that there is no universal pattern in the exploitation of resources, but rather a variety of behavioral strategies related to the environmental characteristics of each system (Novakowski et al 2008).…”
Section: Discussionsupporting
confidence: 85%
“…In addition, the calculation of trophic levels and the classification of the species in feeding guilds provide an essential understanding of resource partitioning and the distribution of niches within a fish assemblage (S a- Oliveira et al, 2014).…”
Section: Introductionmentioning
confidence: 99%
“…El análisis de modelos nulos, que permite diferenciar entre patrones reales y resultados productos del azar, indicó que existe una segregación promedio del nicho trófico significativamente más alto que el esperado; esto sugiere que la competencia interespecífica no es un mecanismo importante en la partición del nicho trófico para el grupo de peces estudiados, y que las especies tienden a compartir los más abundantes recursos (Sá-Oliveira et al, 2013). También se puede inferir que dicha segregación no está influenciada o generada por la competencia, lo que puede ser explicado por las condiciones biológicas de cada especie, como las diferencias morfológicas que le permiten explotar el recurso en diferentes lugares del hábitat, y como se indicó con anterioridad, el recurso trófico es abundante durante toda la época de estudio.…”
Section: Discussionunclassified