Influência do ambiente no conteúdo calórico e na condição fisiológica de duas espécies migradoras de peixes neotropicais

Pazianoto, Laryssa H. R.; Souza, Maíra Luana Santos; Veronezzi, Ana Lúcia; Benedito, Evanilde

doi:10.1590/s0073-47212013000300001

Cited by 2 publications

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“…The first features preserved riparian vegetation and, consequently, provide a diverse array of possible food resources to aquatic communities, maintaining ecosystem processes and dynamic (Agostinho et al, 2004;Corbetta, 2013;Pazianoto et al, 2013). Ivinhema also sustain the highest production and availability of organic detritus (Azevedo et al, 2008), preferred food items for H. orthonops.…”

Section: Discussionmentioning

confidence: 99%

Feeding and body condition of an invasive fish species under different environmental conditions

et al. 2016

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Diet, energy density (ED) and relative condition factor (Kn) were used to investigate the energetic assimilation of the invasive fish Hemiodus orthonops under different environmental condition of the upper rio Paraná floodplain. Samples were taken in June and September 2013 and 2014. Nutrient content was determined for sediment. The diet was combined in the Food Index (IAi%), ED was expressed in Kcal/g of dry weight and Kn was calculated by: K n = Wt/We, where Wt is the total weight and We the expected weight. Detritus/sediment prevailed in the stomachs of specimens from Ivinhema and Baia, while Algae was the main item in Paraná, reflecting the resource availability. ED and Kn from Ivinhema specimens were the greatest, consequence of the quality of food and lower spent on searching and handling food. The Paraná specimens showed lower ED values, but higher Kn values, due to algae consumption, a nutrient-rich resource. Baia presented high aluminum concentration on the sediment and the lower pH values, which contribute to reduce the nutritional value of the detritus and the ED and Kn values of their specimens. In conclusion, H. orthonops is capable to take advantage of the resources availability in the different environments, ensuring their establishment.Análise de dieta, densidade energética (DE) e fator de condição relativo (Kn) foram utilizados para investigar a assimilação energética do peixe invasor Hemiodus orthonops sob diferentes condições ambientais da planície de inundação do alto rio Paraná. As coletas ocorreram em junho e setembro de 2013 e 2014. O teor de nutrientes foi obtido para o sedimento. A dieta foi combinada no Índice Alimentar (IAi%), a DE foi expressa em Kcal/g de peso seco, o Kn foi calculado através de: K n = Wt/We, onde Wt é o peso total e We o peso esperado. Detrito/sedimento prevaleceu nos estômagos dos espécimes do Ivinhema e Baía, enquanto Alga foi o principal item no Paraná, refletindo a disponibilidade de recursos. A DE e Kn dos indivíduos do Ivinhema foram os maiores, consequência da qualidade do alimento e do menor gasto em procura e manipulação do alimento. Os indivíduos do Paraná registraram os menores valores de DE, mas elevados valores de Kn, devido ao consumo de alga, um recurso alimentar rico em nutrientes. Baía apresentou elevada concentração de alumínio no sedimento e reduzidos valores de pH, o que contribuiu com a redução do valor nutricional do detrito e dos valores de DE e Kn dos indivíduos. Concluindo, H. orthonops é capaz de se beneficiar da disponibilidade de recursos nos diferentes ambientes, garantindo seu estabelecimento.

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Section: Discussionmentioning

confidence: 99%

Feeding and body condition of an invasive fish species under different environmental conditions

et al. 2016

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Caloric content of leaves of five tree species from the riparian vegetation in a forest fragment from South Brazil

et al. 2015

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Aim: The measurement of the caloric content evidences the amount of energy that remains in the leaf and that can be released to the aquatic trophic chain. We assessed the energy content of leaves from five riparian tree species of a forest fragment in south Brazil and analyzed whether leaf caloric content varied between leaf species and between seasons (dry and wet). The studied sites are located in Northwest of Paraná State, inside a Semi-Deciduous Forest fragment beside two headwater streams. Methods Sampling sites were located along the riparian vegetation of these two water bodies, and due to its proximity and absence of statistical differences of caloric values, analyzed as one compartment. Results Caloric content varied significantly among species and among all pairs of species, with exception of Nectandra cuspidata Ness and Calophyllum brasiliensis Cambess. Two species presented significant differences between seasons, Sloanea guianensis (Aubl.) Ben and Calophyllum brasiliensis Cambess. Conclusions The absence of significant seasonal differences of energy content for some species may be due to the characteristics of the tropical forest, in which temperature did not varied dramatically between seasons. However, the energy differed between species and seasons for some species, emphasizing the necessity of a preliminary inspection of energy content, before tracing energy fluxes instead of using a single value to all species from riparian vegetation.

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Influência do ambiente no conteúdo calórico e na condição fisiológica de duas espécies migradoras de peixes neotropicais

Cited by 2 publications

References 10 publications

Feeding and body condition of an invasive fish species under different environmental conditions

Feeding and body condition of an invasive fish species under different environmental conditions

Caloric content of leaves of five tree species from the riparian vegetation in a forest fragment from South Brazil

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