Alimentação de peixes: proposta para análise de itens registrados em conteúdos gástricos

Bennemann, Sirlei Terezinha; Casatti, Lílian; Oliveira, Deise Cristiane de

doi:10.1590/s1676-06032006000200013

Cited by 34 publications

(31 citation statements)

References 15 publications

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“…This study confirmed the insectivorous-omnivorous habit and feeding plasticity for both Astyanax species, as indicated by several other authors (e.g. Nomura, 1975;Arcifa et al, 1991;Uieda et al, 1997;Bennemann et al, 2006;Abilhoa, 2007) and also highlighted the insetivorous feeding habit, likewise displayed by other Astyanax species specially in streams and rivers (see Vilella et al, 2002 for A. eigenmanniorum;Vidotto-Magnoni &Carvalho, 2009 for A. altiparanae andFerreira et al, 2012 for A. paranae). At this context, diet dissimilarities between the Astyanax species were revealed mainly due to the source of itens consumed.…”

Section: Discussionsupporting

confidence: 89%

Habitat heterogeneity on feeding habit of two sympatric and congeneric characidae fishes in two tropical reservoirs

Lopes

Nessimian

Da-Silva

et al. 2016

Iheringia, Sér. Zool.

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ABSTRACT. Food fl exibility and omnivory are important features pronounced in Neotropical freshwater fi sh species, particularly for Astyanax species. Traditionally most fi sh diet resources are known to be originated in the aquatic environment, however recent studies have pointed to the importance of allochthonous sources. Besides, the colonization of macrophytes, common at several tropical reservoirs, may enhance insectivory in fi sh diet expanding or concentrating the area of available resources for feeding. Here we employed stomach contents analysis of two sympatric Astyanax species to access the importance of habitat diff erentiations as spatial complexity in two tropical reservoirs with diff erent environmental features. The NMDS analysis indicated separation in the diet of these species between reservoirs (Stress= 8.28%). Additionally, analysis of variance revealed a signifi cative diff erence in the volume of food itens ingested between the reservoirs (Anova one-way F(1, 132)=4.4446; p= 0.037). This points out the importance of environmental conditions on the composition of the diet of fi shes. This study highlighted the insectivorous feeding habit of Astyanax species and revealed diff erent feeding strategies between sympatric fi shes despite high niche overlap in both environments. Habitat heterogeneity increasing food resources availability plays an important role in the diet strategy of these Astyanax species and on their constant maintenance in the two diff erent reservoirs.KEYWORDS. Feeding resources, land-water ecotone, trophic ecology, Astyanax aff . bimaculatus, Astyanax parahybae. RESUMO. Heterogeneidade de habitat no hábito alimentar de duas espécies simpátricas e congenéricas de peixes caracídeos em dois reservatórios tropicais.A fl exibilidade alimentar e onivoria são características das espécies de peixes de água doce neotropicais, especialmente em espécies de Astyanax. Tradicionalmente a maioria dos recursos na dieta de peixes é reconhecidamente originária do ambiente aquático, porém estudos recentes têm apontado para a importância das fontes alóctones. Além disso, a colonização de macrófi tas, comuns em vários reservatórios tropicais, pode melhorar os aspectos de insetivoria na dieta dos peixes expandindo ou concentrando a área disponível para a alimentação. Aqui analisamos o conteúdo estomacal de duas espécies de Astyanax simpátricas para avaliar a importância das diferenças de habitats, como a complexidade espacial, em dois reservatórios tropicais com diferentes características ambientais. A análise NMDS indicou separação na dieta destas espécies entre reservatórios (stress = 8.28%). Além disso, a análise de variância revelou uma diferença signifi cativa no volume de itens alimentares consumidos entre os reservatórios (Anova one-way F (1. 132) = 4,4446; p = 0.037), salientando a importância das condições ambientais na composição da dieta de peixes. O estudo destacou o hábito alimentar insetívoro das espécies de Astyanax e revelou diferentes estratégias de alimentação entre esses peixes ...

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Section: Discussionsupporting

confidence: 89%

Habitat heterogeneity on feeding habit of two sympatric and congeneric characidae fishes in two tropical reservoirs

Lopes

Nessimian

Da-Silva

et al. 2016

Iheringia, Sér. Zool.

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“…Several authors describe the gender Schizodon as an herbivorous one (Santos, 1982;Bennemann et al, 1996Bennemann et al, , 2000Bennemann et al, , 2006Meschiatti, 1995;Ferretti et al, 1996;Resende, 2000;Marcal-Simabuku and Peret, 2002;Pompeu and Godinho, 2003;Pereira et al, 2004;Teixeira and Bennemann, 2007). The item Poaceae (grass) was the most significant one in the whole period observed, since it presented the highest frequencies and dominance, reflecting the availability of this alimentary item, because they are usually found in abundance on the margins of Sorocaba river, being even more accessible during the rainy period.…”

Section: Discussionmentioning

confidence: 99%

“…In order to determine the importance of each alimentary item, the methodology proposed by Bennemann et al (2006) was adopted, proposing the use of the dominance of the alimentary item in combination to Costello`s (1990) graphic methods. The dominance is given as a percentage, which a particular food item represents as the most important of each stomach, according to the total number of samples analysed.…”

Section: Data Analysis Dietmentioning

confidence: 99%

Biological aspects of Schizodon nasutus Kner, 1858 (Characiformes, Anostomidae) in the low Sorocaba river basin, São Paulo state, Brazil

Villares¹,

Gomiero²,

Goitein³

2011

Braz. J. Biol.

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Four biological aspects of Schizodon nasutus in the low Sorocaba river basin, São Paulo, Brazil were analysed. These were accomplished during the year seasons. The fish diet and the feeding activity were investigated by studying the repletion index, which showed no significant differences between seasons. The food items analysed by frequency of occurrence and dominance showed a predominance of vegetable items in the diet. The reproduction, analysed by using the gonadosomatic index, indicated that the reproductive period occurs during the summer period when temperatures are higher and rainfalls are more intense. The amount of accumulated fat and condition factor varied according to reproduction, especially for females.Keywords: feeding, reproduction, condition factor, seasonality. Aspectos da biologia de Schizodon nasutus Kner, 1858 (Characiformes, Anostomidae) no trecho inferior da bacia do rio Sorocaba, estado de São Paulo, Brasil ResumoForam analisados quatro aspectos da biologia de Schizodon nasutus no trecho inferior da bacia do rio Sorocaba, estado de São Paulo, Brasil. Esses aspectos foram abordados durante as estações do ano. Na dieta da espécie, a atividade alimentar averiguada pelo índice de repleção estomacal não mostrou diferença significativa entre as estações. Os itens alimentares analisados pela frequência de ocorrência e dominância mostraram a predominância de itens de origem vegetal na dieta. A reprodução, analisada pela relação gonadossomática, indicou que o período reprodutivo ocorre durante o verão, quando há aumento de temperatura da água e das chuvas. A quantidade de gordura acumulada e o fator de condição variaram de acordo com a reprodução, principalmente para as fêmeas.Palavras-chave: alimentação, reprodução, fator de condição, sazonalidade.

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“…The feeding strategy of A. altiparanae was evaluated using the Graphic Method of Amundsen, Gabler, and Staldvik (1996) modified from Costello (1990), which measures the tendency of a species to a generalist or specialist diet, at the individual and population level, using the relationship between Dominance (Bennemann, Casatti, & Oliveira, 2006) (expressed as the percentage of the number of times the item occupies most of the content of each stomach according to the total number of analyzed individuals) and Frequency of Occurrence. Food items were determined from the identification of the most dominant and frequent items; for this, dominance (y-axis) of each item was plotted as a function of frequency of occurrence (x-axis).…”

Section: Methodsmentioning

confidence: 99%

Influence of Eichhornia crassipes and Lemna sp. on the natural diet of Astyanax altiparanae Garutti & Britski, 2000 in the initial stages

Galdioli

Hayashi

Soares

et al. 2017

Acta Sci. Biol. Sci.

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ABSTRACT. Aiming to study the changes in the diet of Astyanax altiparanae in the early developmental stages, in the presence of Eichhornia crassipes (EC) and Lemna sp. (LM), larvae of Astyanax altiparanae were stocked in eight tanks of 900 L (500 ind. tank -1 ), four with EC and four with LM covering 50% surface. Tanks were inoculated with plankton and received 3.0 g inorganic fertilizer (NPK-7:14:8) and 1.5 g every week. At every three days, three larvae were taken from each tank, fixed in 4% formaldehyde and grouped into four age classes (I: 6 to 12 days, II:15 to 21 days, III:24 to 30 days; IV:33 to 39 days). The analysis of dominance and frequency of occurrence (FO) of food items indicated that, at this stage, A. altiparanae is generalist. In class I, there was a greater dominance and FO of Lecane bulla and Alona sp. in digestive tracts in the presence of both EC and LM, respectively; and larvae started to consume larger organisms, such as Chironomidae, in other age classes with EC. In the presence of LM, Alona sp. was dominant in class II; Chironomidae, in class III and Centropyxis sp., in class IV. Diatoms have greater FO both in EC and in LM. In class III, with EC, Chironomidae had higher FO, as well as Arcella sp. and Scenedesmus spp. with LM. The highest FO in class IV was found for L. bulla and Scenedesmus spp., with EC and LM, respectively. It can be concluded that EC and LM influenced the diet of Astyanax altiparanae, with alterations according to the availability of organisms and increase in age.Keywords: fish larvae, floating macrophyte, plankton, larval development, diet. ), sendo quatro com EC e quatro com LM cobrindo 50% da superfície destes. Os tanques foram inoculados com plâncton e receberam 3,0 g de fertilizante inorgânico (NPK-7:14:8) e 1,5 g semanalmente. A cada três dias foram coletadas três larvas de cada tanque, fixadas em formol a 4% e agrupadas em quatro classes de idade (I: 6 a 12 dias, II: 15 a 21 dias, III: 24 a 30 dias e IV:33 a 39 dias). Relacionando a dominância e frequência de ocorrência (FO) dos itens alimentares verificou-se que, nesta fase, o A. altiparanae é generalista. Na classe I, houve maior dominância e FO de Lecane bulla e de Alona sp. nos tratos digestórios na presença de EC e LM, respectivamente, passando a consumir organismos maiores como Chironomidae nas demais classes com EC. Na presença de LM, Alona sp. foi dominante na classe II, Chironomidae na III e Centropyxis sp. na IV. As diatomáceas tiveram maior FO tanto em EC quanto em LM. Na classe III, com EC Chironomidae teve maior FO, assim como Arcella sp. e Scenedesmus spp. com LM. A maior FO na classe IV foi de L. bulla e Scenedesmus spp. com EC e LM, respectivamente. Concluiu-se que EC e LM influenciaram a dieta de A. altiparanae, alterando-a de acordo com a disponibilidade dos organismos e com o aumento da idade. Influência dePalavras-chave: larva de peixe, macrófita flutuante, plâncton, desenvolvimento larval, alimentação.

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Alimentação de peixes: proposta para análise de itens registrados em conteúdos gástricos

Cited by 34 publications

References 15 publications

Habitat heterogeneity on feeding habit of two sympatric and congeneric characidae fishes in two tropical reservoirs

Habitat heterogeneity on feeding habit of two sympatric and congeneric characidae fishes in two tropical reservoirs

Biological aspects of Schizodon nasutus Kner, 1858 (Characiformes, Anostomidae) in the low Sorocaba river basin, São Paulo state, Brazil

<b>Influence of <i>Eichhornia crassipes</i> and Lemna sp. on the natural diet of <i>Astyanax altiparanae</i> Garutti & Britski, 2000 in the initial stages

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