2007
DOI: 10.1590/s1676-06032007000200017
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Abstract: (post-impoundment period) within the reservoir. Stomach contents of 549 individuals were analyzed and the diet was described as occurrence and volumetric percentage of each item combined in a feeding index. The piscivorous habit was, overall, more evident in H. malabaricus, O. longirostris and R. voulezi. However, for R. branneri mollusks and crabs were more important than fish. After the impoundment, most consumed prey was Astyanax sp. b and Cyphocharax modestus for three of the predators. These prey species … Show more

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Cited by 32 publications
(35 citation statements)
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“…On the other hand, other authors (Cassemiro et al 2005, Novakowski et al 2007 found dietary differences between R. branneri and R. voulezi. However, patterns in the diet of these fishes were not clearly defined, occurring local variations (Cassemiro et al 2005).…”
Section: Discussionmentioning
confidence: 87%
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“…On the other hand, other authors (Cassemiro et al 2005, Novakowski et al 2007 found dietary differences between R. branneri and R. voulezi. However, patterns in the diet of these fishes were not clearly defined, occurring local variations (Cassemiro et al 2005).…”
Section: Discussionmentioning
confidence: 87%
“…The ecomorphological indices related to occupation of lentic habitats probably favored R. voulezi to feed on prey that explore the bottom, such as Cyphocharax modestus (Fernández-Yépez 1948), and fishes that can forage in shallow waters, such as some species of Astyanax ). These two prey types were the most consumed by piscivores in Salto Caxias Reservoir (Novakowski et al 2007). The ecomorphological characteristics related to benthic fishes (depressed body) in R. branneri may have favored the ingestion of benthic crustaceans as Aegla sp.…”
Section: Discussionmentioning
confidence: 95%
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“…The high availability of allochthonous resource in the environment, may cause a positive effect in the production of all trophic levels, an event known as the trophic upsurge period (Kimmel & Groeger, 1986;O'Brien, 1990;Gubiani et al, 2011). The high availability of small body size species in the new environment should increase the frequency of fish with a carnivorous fish diet (Novakowski et al, 2007) or even lead some omnivorous species to piscivory (Luz- Agostinho et al, 2006;Delariva et al, 2007). Although the nutritional quality of a fish-based diet should be higher than one based on other items, such as invertebrates, due to its high protein (Anthony et al, 2000) and energy content (Davis et al, 1998), the organism's response to this consumption should differ according to the species diet in the natural environment.…”
Section: Introductionmentioning
confidence: 99%
“…Several studies investigated the role of predation on population dynamics (e.g. Novakowski et al, 2007). Some of the well known positive effects of predation come about from the selective pressure directed to weaker prey individuals, and the control of dominant species, therefore maintaining appropriate levels of diversity (Popova, 1978).…”
Section: Introductionmentioning
confidence: 99%