Trophic structure of a fish community in Bananal stream subbasin in Brasília National Park, Cerrado biome (Brazilian Savanna), DF

Schneider, Mariana; Aquino, Pedro de Podestà Uchôa de; Silva, Maria Júlia Martins; Fonseca, Claudia Padovesi

doi:10.1590/s1679-62252011005000030

Cited by 24 publications

(30 citation statements)

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“…The fish fauna used a range of food items, especially insects (terrestrial and aquatic), plants and detritus, corroborating the general dietary pattern described in the literature for tropical streams (Casatti, 2002;Borba et al, 2008;Brandão-Gonçalves et al, 2010;Mazzoni et al, 2010b;Tófoli et al, 2010;Schneider et al, 2011). detritivorous species Hypostomus ancistroides, Hisonotus sp.…”

Section: Discussionsupporting

confidence: 79%

“…During the rainy period, which in this region coincides with the warmest period of the year, the higher consumption of terrestrial invertebrates was due to greater emergence of arthropods, mainly adult insects, which, along with the rainfall, favors the transport of these organisms into the aquatic environment (Angermeier & Karr, 1983;Rezende & Mazzoni, 2005;Tófoli et al, 2010). In the dry season, the high intake of allochthonous plant material is caused by the lower current flow and water volume, which allows leaves and tree trunks to accumulate along the stream banks, making them available for the community (Schneider et al, 2011). The greater senescence of leaves of the Seasonal Semideciduous Forest, typical of the region, also contributed to this availability.…”

Section: Discussionmentioning

confidence: 99%

“…In these environments, seasonal variations in the diet of fish species are common, with a wider niche breadth during the rainy season; in the dry season, these species become more specialized in a subset of resources (Winemiller et al, 2008). Nevertheless, in some environments these differences may not exist because the food resources remain available throughout the year in sufficient amounts (Mazzoni et al, 2010a;Schneider et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Food-resource partitioning among fish species from a first-order stream in northwestern Paraná, Brazil

2012

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This study addressed the feeding ecology of fish fauna from a first-order stream located in a rural area. The purposes were to evaluate the influence of interspecific, seasonal and spatial factors on the diet, examine the dietary overlap, and determine the predominant food sources. Sampling was conducted in December 2007, September 2008, and March 2009, in three 50-m stretches of Itiz stream (upstream, intermediate, and downstream), through electrofishing. A total of 1,102 stomach contents were analyzed from 14 species, by the volumetric method. In general, allochthonous resources were predominant in the diets. Astyanax aff. fasciatus, Astyanax aff. paranae, Astyanax bockmanni, and Bryconamericus aff. iheringi consumed a higher proportion of plant remains, and Bryconamericus stramineus consumed predominantly Hymenoptera. The diets of Cetopsorhamdia iheringi, Characidium aff. zebra, Imparfinis schubarti, and Trichomycterus sp. consisted of aquatic insects, especially immature forms of Trichoptera, Ephemeroptera, Plecoptera, and Diptera. Hypostomus ancistroides, Hisonotus sp., Poecilia reticulata, and Rineloricaria aff. pentamaculata exploited mainly detritus, while Rhamdia quelen used a variety of items, predominantly terrestrial insects. Detrended Correspondence Analysis (DCA) showed a clear distinction among the species, with different morphology and feeding tactics. The Multi-Response Permutation Procedure (MRPP) supported this differentiation, and also indicated significant spatial and temporal variations in the dietary composition; the Indicator Value Method (IndVal) indicated the main items that contributed to these differences. The diet overlap among species was low (< 0.4) to around 78% of pairs, and the mean value did not vary significantly among the sites or between hydrological periods within each site. According to the null model of Pianka's index, the values for dietary overlap were significantly higher than expected at random, showing evidence of resource sharing. This was related to the availability of allochthonous resources, highlighting the importance of riparian vegetation as a source of these resources for maintaining the fish fauna of the stream.Este estudo abordou a ecologia alimentar da ictiofauna de um riacho de primeira ordem situado em área rural. Os objetivos foram verificar a influência dos fatores interespecíficos, sazonais e espaciais sobre a dieta, avaliar a sobreposição alimentar, além de determinar os recursos alimentares predominantes. As amostragens foram realizadas em dezembro/2007, setembro/ 2008 e março/2009, em três pontos do riacho Itiz (montante, intermediário e foz) com extensões de 50 m, através de pesca elétrica. Foram analisados 1102 conteúdos estomacais referentes a 14 espécies de acordo com o método volumétrico. De forma geral observou-se que a maior contribuição na dieta das espécies foi de recursos alóctones. Astyanax aff. fasciatus, Astyanax aff. paranae, Astyanax bockmanni, Bryconamericus aff. iheringi, consumiram maior proporção de vegetal e Bryconamericus stram...

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Food-resource partitioning among fish species from a first-order stream in northwestern Paraná, Brazil

2012

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“…P. harpagos is broadly distributed throughout south, southern and midwest Brazilian Watersheds and is a typical specialist species, with diets based on detritus and periphyton from shallow waters (Casatti, 2002;Mazzoni & Araújo, 2010). Schneider et al (2011) found that P. harpagos occurred only in sites where the vegetation cover is less dense and the stream is wider, reinforcing the high adaptability in response to environment variation (Hahn et al, 2004). Higher phenotypic plasticity and opportunism may explain the dominance of these groups under deforested conditions , as also observed for K. moenkhausii in other studies in the region (Couto & de Aquino, 2011;Schneider et al, 2011).…”

Section: Assemblage Structure and Compositionmentioning

confidence: 99%

Effects of conservation status of the riparian vegetation on fish assemblage structure in neotropical headwater streams

et al. 2015

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The aims of this study were to investigate the relationships between the riparian vegetation and fish assemblages (structure, composition and diet) in forested (Riparian Cover C80%; Canopy cover C90%) and deforested (RC \ 80%; CC \ 90%) headwater streams and to test how those assemblage characteristics respond temporally in streams with different conservation conditions. We sampled in five Neotropical headwater streams during dry and wet season in areas of natural and degraded riparian vegetation on central Brazil. The fish assemblage structure was related to the conservation status of the stream, and no differences were observed in the assemblages between seasons. Allochthonous food items represented 47% of the fishes' diet, followed by items of unknown origin and autochthonous items. Only Astyanax sp. and Astyanax rivularis showed evidence of temporal diet variation. The consumption of a wide spectrum of food items was an outstanding feature, indicating the fishes' capacity to adapt to ecosystem changes. Differences between natural and deforested streams demonstrated the importance of the riparian zone as an indirect selective force on diets and composition of fish communities in headwater streams, suggesting that changes in the structure and composition of riparian vegetation may significantly affect the integrity of fish communities.

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“…Fish use a wide array of food resources available in the environment (Schneider et al, 2011) and are known to occupy all trophic levels, more than any other vertebrate group (Wootton, 1990). Members of the family Characidae have all types of feeding habits and can change them depending on the environment and spatial and seasonal fl uctuations (e.g.…”

mentioning

confidence: 99%

Influence of feeding plasticity on the fitness of small Neotropical characids

Fiori

Alves

Hahn

et al. 2016

Iheringia, Sér. Zool.

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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 diff erences and the infl uence on population fi tness. The main goal was check if these species show better fi tness 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 diet was evaluated by analyzing contents and calculating the relative condition factor for each sampled individual, obtaining a mean value for each population. Species exhibited high food plasticity; H. eques and P. kennedyi altered most their diets from a lagoon to another. Despite these variations, the condition factor showed no signifi cant spatial variation for any species. The results indicated that these species have physiological adaptations that allow them to obtain the maximum energy from food, even if it has low nutritional value, or that fi sh can compensate for the consumption of low nutritional food by increasing the consumption rate. Thus, regardless of the type of resources consumed, these have met the metabolic needs of the fi sh in the studied lagoons.KEYWORDS. Fishes, diet, condition factor, Pantanal, lagoons.RESUMO. Infl uência da plasticidade alimentar no fi tness de pequenos caracídeos neotropicais. Este estudo investigou a dieta de quatro caracídeos [Hyphessobrycon eques (Steindachner, 1882), Odontostilbe pequira (Steindachner, 1882), Psellogrammus kennedyi (Eigenmann, 1903) e Serrapinnus calliurus (Boulenger, 1900)], que coexistem em duas lagoas, e verifi caram-se possíveis diferenças espaciais no fi tness dessas populações. O objetivo principal foi analisar se essas espécies demonstram melhor fi tness de acordo com o valor nutricional do recurso consumido. Desta forma, espera-se que as espécies demonstrem melhores condições nutricionais (demonstrado pelo fator de condição relativo) durante o forrageamento de itens de origem animal, assim como o contrario é esperado ao consumir itens de origem vegetal e detritos. A amostragem foi realizada em agosto de 2011. A dieta foi avaliada através da análise do conteúdo estomacal e o fator de condição relativo foi calculado para cada indivíduo amostrado, obtendo-se um valor médio para cada população. As espécies exibiram elevada plasticidade alimentar; H. eques e P. kennedyi alteraram a maioria dos itens alimentares de suas dietas entre as lagoas estudadas. Apesar destas variações, o fator de condição não variou espacialmente para qualquer espécie. Os resultados indicam que estas espécies possuem adaptações fi siológicas que lhes permitem obter o máximo de energia a partir do alimento, mesmo que...

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Trophic structure of a fish community in Bananal stream subbasin in Brasília National Park, Cerrado biome (Brazilian Savanna), DF

Cited by 24 publications

References 40 publications

Food-resource partitioning among fish species from a first-order stream in northwestern Paraná, Brazil

Food-resource partitioning among fish species from a first-order stream in northwestern Paraná, Brazil

Effects of conservation status of the riparian vegetation on fish assemblage structure in neotropical headwater streams

Influence of feeding plasticity on the fitness of small Neotropical characids

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