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| Fiori,Leandro Fabrício; Figueiredo,Bruno R. S.; Pavanello,Audrei; Alves,Vander Silva; Mathias,Paulo Cezar de Freitas; Benedito,Evanilde. |
| ABSTRACT Considering that the anti-predation behaviour of prey fishes may vary with predator hunting strategy, we experimentally investigated the physiological responses of Astyanax bimaculatus (Linnaeus, 1758) shoals to the presence of two piscivorous fish species with different hunting modes: sit-and-wait and active pursuit. In addition, we evaluated the influence of underwater visibility conditions on the interaction between predator and prey. We tested the hypotheses that: (i) prey plasma cortisol and glucose levels vary according to piscivore hunting strategy, and (ii) no reduction in plasma glucose and cortisol levels takes place in turbid environments due to the inability of prey to accurately recognise predators by non-visual signals. The results... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metabolism; Hoplias aff. malabaricus; Astronotus crassipinnis; Astyanax bimaculatus; Turbidity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212018000100232 |
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| Fiori,Leandro Fabrício; Alves,Gustavo Henrique Zaia; Hahn,Norma Segatti; Benedito,Evanilde. |
| Abstract This study investigated the diet of four characids [Hyphessobrycon eques (Steindachner, 1882), Odontostilbe pequira (Steindachner, 1882), Psellogrammus kennedyi (Eigenmann, 1903) and Serrapinnus calliurus (Boulenger, 1900) ] coexisting in two lagoons and checked for possible spatial differences and the influence on population fitness. The main goal was check if these species show better fitness according to the nutritional value of the food resource consumed. In this way, it is expected that the species show improved nutritional conditions (evidenced by the relative condition factor) when foraging for items of animal origin, and the reverse is expected when consuming items of plant origin and detritus. Sampling was conducted in August 2011. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fishes; Diet; Condition factor; Pantanal; Lagoons. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212016000100206 |
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