Uso de recursos alimentares por peixes imaturos e adultos de espécies piscívoras em uma planície de inundação neotropical

Bozza, André Nogueira; Hahn, Norma Segatti

doi:10.1590/s1676-06032010000300025

Cited by 40 publications

(38 citation statements)

References 40 publications

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“…The predator was selected not only due to its wide distribution and great value as fishery resource in many South American rivers (Agostinho et al, 2003;Barletta et al, 2010) but also because of its piscivorous habit throughout the ontogenetic growth (Bozza & Hahn, 2010), and because the effects of Neotropical nocturnal piscivores on the survival rates and behavior of native and invasive preys are virtually unknown. Two native (yellowtail tetra Astyanax altiparanae Garutti & Britski, 2000 and streaked prochilod Prochilodus lineatus (Valenciennes, 1837)) and three invasive (peacock bass Cichla piquiti, Nile tilapia Oreochromis niloticus and channel catfish Ictalurus punctatus) species were offered as prey to juvenile P. corruscans.…”

Section: Methodsmentioning

confidence: 99%

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Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

et al. 2012

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We experimentally examined the predator-prey relationships between juvenile spotted sorubim Pseudoplastystoma corruscans and young-of-the-year invasive and native fish species of the Paraná River basin, Brazil. Three invasive (peacock bass Cichla piquiti, Nile tilapia Oreochromis niloticus, and channel catfish Ictalurus punctatus) and two native (yellowtail tetra Astyanax altiparanae and streaked prochilod Prochilodus lineatus) fish species were offered as prey to P. corruscans in 300 L aquaria with three habitat complexity treatments (0%, 50% and 100% structure-covered). Prey survival was variable through time and among species (C. piquiti < O. niloticus < A. altiparanae < P. lineatus < I. punctatus), depending largely on species-specific prey behavior but also on prey size and morphological defenses. Habitat complexity did not directly affect P. corruscans piscivory but some prey species changed their microhabitat use and shoaling behavior among habitat treatments in predator's presence. Pseudoplatystoma corruscans preyed preferentially on smaller individuals of those invasive species with weak morphological defensive features that persisted in a non-shoaling behavior. Overall, our results contrast with those in a companion experiment using a diurnal predator, suggesting that nocturnal piscivores preferentially prey on different (rather diurnal) fish species and are less affected by habitat complexity. Our findings suggest that recovering the native populations of P. corruscans might help controling some fish species introduced to the Paraná River basin, particularly C. piquiti and O. niloticus, whose parental care is expected to be weak or null at night.A relação predador-presa entre juvenis de pintado Pseudoplatystoma corruscans (piscívoro nativo) e jovens do ano de espécies nativas e invasoras de peixes da bacia do rio Paraná, Brasil, foi testada experimentalmente. Três espécies de peixe invasoras (o tucunaré Cichla piquiti, a tilápia do Nilo Oreochromis niloticus e o bagre do canal Ictalurus punctatus) e duas nativas (o lambari do rabo amarelo Astyanax altiparanae e o curimbatá Prochilodus lineatus) foram oferecidas como presa para P. corruscans em microcosmos, com três tratamentos de complexidade de habitat (0%, 50% e 100% de cobertura por estruturas submersas). A sobrevivência de presas variou ao longo do tempo e entre espécies (C. piquiti < O. niloticus < A. altiparanae < P. lineatus < I. punctatus), sendo governada, em grande parte, por diferenças espécies-específicas no comportamento das presas, mas também pelo tamanho e defesas morfológicas das mesmas. A complexidade de habitat não afetou diretamente a piscivoria de P. corruscans, mas, na presença do predador, algumas espécies-presa alteraram seu comportamento quanto ao uso de micro-habitat e grau de agregação entre os níveis de complexidade de habitat. Pseudoplatystoma corruscans predou preferencialmente sobre os indivíduos menores das espécies invasoras que apresentaram estruturas morfológicas defensivas pouco desenvolvidas e que não formavam cardu...

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Section: Methodsmentioning

confidence: 99%

“…an armored catfish with stout spines) and Gymnotus spp. are so or more important than the diurnal P. lineatus for the diet of juvenile (220-650 mm TL) and adult (>750 mm TL) P. corruscans (Bozza & Hahn, 2010;Faria & Benedito, 2011). More studies (e.g.…”

Section: Management Implicationsmentioning

confidence: 99%

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

et al. 2012

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“…fasciatus is the species more abundance in the Sorocaba River basin . The higher frequency of prey belonging to the Astyanax genus reinforces the general recognition that they are most frequent and abundant fish in Neotropical rivers, living in a great diversity of environments; they are omnivorous and very active (Britski et al, 1988), serving as food for a great number of predators (Smith, 2003;Bozza and Hahn, 2010).…”

Section: Discussionmentioning

confidence: 74%

“…Piet (1998) alerts that many authors have ignored the influence of intra-specific variations in the division of feeding resources. Direct differences between two classes of sizes to Salminus may indicate a distinct feeding strategy between shoals of fish of different sizes (Olarte and Taphorn 2006;Bozza and Hahn, 2010). Differences in body size are the main means through which species avoid overlapping for resources uses within the environment, by the evolutionary abilities they have developed for the use of resources and avoiding the risks of predation (Werner and Gilliam, 1984).…”

Section: Discussionmentioning

confidence: 99%

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Variations of Salminus hilarii diet (Ostariophysi, Characidae): seasonal and ontogenetic effects

Villares

Goitein

2015

Braz. J. Biol.

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This study described the variations seasonal and ontogenetic of Salminus hilarii diet. Samples were collected in the Sorocaba River, São Paulo, Brazil, one of the few rivers where individuals of the species still occur in a higher frequency. The preys consumed were analyzed by Importance Alimentary Index (AIi). To determine similarities between year seasons, the AIi data were analyzed by the Morisita-Horn index and reduced in cluster analysis, along with a statistical comparison made by one-way ANOSIM test (5%). The feeding activity was analyzed according to the stomach repletion index and compared among the year seasons using non parametric variance analysis Kruskal-Wallis test (5%).Comparison of prey consumed between immature and adult individuals was made by Spearman correlation (5%). A Pearson correlation (5%) was applied between the standard length of the fish and prey consumed, as well as between the mouth and prey heights. The analyzes of stomach contents showed that the diet of this species was exclusively piscivorous, with significant difference of prey consumption during the period, the same happening among adult and immature individuals. It was observed that these fishes use to swallow their prey whole and that significant correlations between size of predator and prey size can be observed. There is also correlation between the mouth height and the maximum prey depth. Salminus hilarii feeds on the available prey, and the species food composition and feeding activity depends on prey`s abundance, their size and morphology, as do the water temperatures.Keywords: piscivorous, feeding activity, seasonality, ontogeny, Sorocaba river. Variações na dieta de Salminus hilarii (Ostariophysi, Characidae):efeitos da sazonalidade e ontogenia. ResumoEste estudo descreve as variações na dieta de Salminus hilarii em relação aos efeitos da sazonalidade e da ontogenia. As coletas foram realizadas no rio Sorocaba, São Paulo, Brasil, um dos poucos rios onde a espécie ainda é encontrada com frequência. As presas consumidas foram analisadas pelo índice de importância alimentar (AIi). Para determinar similaridades entre as estações do ano, os dados do AIi foram analisados pelo índice de Morisita-Horn e reduzidos em uma análise de agrupamento, em associação com uma comparação estatística realizada pelo teste one-way ANOSIM (5%). A atividade alimentar foi analisada pelo índice de repleção estomacal e comparada entre as estações do ano usando o teste de variância não paramétrico de Kruskal-Wallis (5%). A comparação das presas consumidas entre os indivíduos imaturos e adultos foi feita pela correlação de Spearman (5%). Uma correlação de Pearson (5%) foi aplicada entre o comprimento padrão do peixe e da presa, assim como entre a altura da boca e a altura da presa. As análises dos conteúdos estomacais mostraram que a dieta dessa espécie foi exclusivamente piscívora, com diferença significativa do tipo de presas consumidas ao longo do ano e entre adultos e imaturos. Foi observado que esta espécie engole as presas inteiras c...

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Dam reverse flow events influence limnological variables and fish assemblages of a downstream tributary in a Neotropical floodplain

Ferreira

Lopes

Affonso

et al. 2019

River Research & Apps

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We used a dam-free tributary (the Baía River) in the upper Paraná River floodplain downstream of a major dam in the Paraná River, Brazil to investigate the effects of dam-regulated reverse flow on limnological variables and fish. We tested the hypotheses that limnological variables in tributaries change based on flow direction and that fish assemblages respond to this variation. Sampling sites were determined considering flow direction (normal or reverse) and position (near or far from the river mouth).Limnological variables showed higher values for transparency, oxygen, pH, and electrical conductivity at sites near the mouth of the Baía River during reverse flow. Species richness and evenness differed significantly in relation to position, with higher values closer to the Paraná River. The average standard length of fish species was higher near the mouth of the Baía River and during the reverse flow period. No significant differences in species abundance were found. Reverse flow into the Baía River brought nutrient-poor water from the dammed Paraná River, thereby altering the limnological variables. This flow condition impelled the entry of species with higher average standard lengths. However, increased species richness and low evenness were due to the increase in species dispersal rates under all flow conditions. Our results emphasize that the effects of dams can extend several kilometres into the floodplain, provide basic knowledge on the effects of major dams on downstream pristine tributaries, and highlight the need for further studies to understand the wider influences. K E Y W O R D Saquatic macrophytes, fish assemblages, river level fluctuation, upper Paraná River floodplain

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Uso de recursos alimentares por peixes imaturos e adultos de espécies piscívoras em uma planície de inundação neotropical

Cited by 40 publications

References 40 publications

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

Experimental assessment of the effects of a Neotropical nocturnal piscivore on juvenile native and invasive fishes

Variations of Salminus hilarii diet (Ostariophysi, Characidae): seasonal and ontogenetic effects

Dam reverse flow events influence limnological variables and fish assemblages of a downstream tributary in a Neotropical floodplain

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