Effects of the hydrological regime on the ichthyofauna of riverine environments of the Upper Paraná River floodplain

Fernandes, Rodrigo; Agostinho, Ângelo Antônio; Ferreira, Eveline A.; Pavanelli, Carla Simone; Suzuki, Harumi Irene; Lima, Dilermando Pereira; Gomes, Luiz Carlos

doi:10.1590/s1519-69842009000300021

Cited by 80 publications

(56 citation statements)

References 25 publications

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“…As to piscivores, the duration and magnitude of floods have a positive effect on the reproductive success of many prey species, increasing food availability for this group (Fernandes et al, 2009). The 2009-2010 pulse presented characteristics that favored juvenile recruitment in most species of the Middle Paraná River floodplain (Abrial et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Esteves, Aranha (1999) have suggested that variations in fish assemblages due to hydrology can explain quantitative and qualitative changes in the diet of different trophic groups (detritivores, herbivores, omnivores, piscivores, planctivores, invertivores and insectivores). For instance, in the case of piscivores, an increment of the duration and magnitude of floods produced a positive effect on the reproductive success of many prey species (Fernandes et al, 2009). However, detritivores, omnivores and herbivores may be adversely affected during flood periods due to transport processes, since flow velocity increases and protein-rich food resources are carried away (Bowen, 1987;Faria, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Influence of hydrology on the fish body condition in a large subtropical floodplain

Rabuffetti¹,

Abrial²,

Espínola³

et al. 2017

Neotrop. ichthyol.

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With the objective of finding fluctuations on fish body condition in the Middle Paraná River floodplain in different hydrological scenarios, this attribute was analyzed in several trophic groups of a secondary floodplain channel and its associated lakes between 2010 and 2012. Standardized residuals generated by length-weight regressions were calculated for each species and the relative weight (Wr) of the most abundant species per group was examined. A two-way factorial ANOVA was carried out (factors: hydrology and habitats) to evaluate the existence of significant spatial-temporal differences by groups and species. Results showed that body condition in detritivorous, herbivorous and omnivorous species fluctuated significantly depending on hydrology and the environment. Optimal body condition was recorded after the largest flood pulse in most species. Body condition decreased during the low-water period and after two disconnection periods, whereas during the second flood pulse it increased in detritivores, herbivores and omnivores. No floods occurred thereafter, but two flow pulses were registered, and body condition increased under these hydrologic scenarios, with similar or higher values to those recorded after the largest pulse. These results indicate that flow pulses, which are supplementary to flood pulses, may have a positive effect on fish body condition.Keywords: Flood/flow pulses, Hydrological fluctuations, Ichthyofauna, Middle Paraná River, Trophic groups.Con el objetivo de conocer la fluctuación de la condición corporal de peces en la planicie de inundación del tramo medio del río Paraná ante diferentes escenarios hidrológicos, se analizó este atributo de diferentes grupos tróficos en un cauce secundario de la planicie y sus lagunas asociadas durante 2010 a 2012. Se calcularon los residuos estandarizados generados por las regresiones longitud-peso para cada especie y se examinó el peso relativo (Wr, por sus siglas en ingles) de las especies más abundantes de cada grupo. Se llevó a cabo un ANOVA factorial de dos vías (factores: hidrología y ambientes) para evaluar la existencia de diferencias significativas espacio-temporales por grupos y por especies. Los resultados mostraron que la condición corporal de las especies detritívoras, herbívoras y omnívoras fluctuó significativamente en función de la hidrología y los ambientes. Óptimas condiciones corporales se registraron en la mayoría de las especies después del mayor pulso de inundación. La condición corporal disminuyó durante el período de aguas bajas y luego de dos períodos de desconexión, mientras que, durante el segundo pulso, aumentó en detritívoros, herbívoros y omnívoros. No hubieron inundaciones luego, pero ocurrieron dos pulsos de flujo y las condiciones corporales se incrementaron bajo estos escenarios hidrológicos, presentando valores similares o incluso mayores a los registrados luego del gran pulso. Esto destaca que los pulsos de flujo complementarios a los pulsos de inundación pueden tener un efecto positivo sobre la condición corporal de ...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of hydrology on the fish body condition in a large subtropical floodplain

Rabuffetti¹,

Abrial²,

Espínola³

et al. 2017

Neotrop. ichthyol.

View full text Add to dashboard Cite

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“…mercury), alterations in the water level, damming of rivers, and deposits of sewage and solid waste (Harris et al, 2005(Harris et al, , 2006. Deforestation, expanding agriculture, illegal fishing and hunting, unplanned tourism, and pollution by pesticides have those whose food supply is based on organic material (Britski et al, 2007;Fernandes et al, 2009). Additionally, demographically healthy populations of many endangered species such as the Brazilian giant otter (Pteronura brasiliensis), the jaguar (Panthera onca) and the greater hyacinth macaw (Anodorhynchus hyacinthinus) are still viable in the Pantanal.…”

Section: Threatsmentioning

confidence: 99%

“…Even small power-plants, which may not form a reservoir, can change the discharge of nutrients and suspended matter and hence the cycling of nutrients in affected water bodies (Calheiros et al, 2009;Fernandes, 2010). Furthermore, the presence of the physical barrier in the form of a dam is known to prevent the movement of migratory fish species during the spawning season, affecting fish production in the medium and long term (Fernandes et al, 2009;Suzuki et al, 2009). All these changes and negative impacts on the water ecology of each sub-basin forming the Pantanal should be assessed simultaneously, in terms of the integrated area of the Upper Paraguay River Basin, prior to installing such projects (Calheiros et al, 2009).…”

Section: River Flow Modification With Implantation Of Small Hydroelecmentioning

confidence: 99%

A conservation agenda for the Pantanal's biodiversity

Alho

Sabino

2011

Braz. J. Biol.

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The Pantanal's biodiversity constitutes a valuable natural resource, in economic, cultural, recreational, aesthetic, scientific and educational terms. The vegetation plus the seasonal productivity support a diverse and abundant fauna. Many endangered species occur in the region, and waterfowl are exceptionally abundant during the dry season. Losses of biodiversity and its associated natural habitats within the Pantanal occur as a result of unsustainable land use. Implementation of protected areas is only a part of the conservation strategy needed. We analyse biodiversity threats to the biome under seven major categories: 1) conversion of natural vegetation into pasture and agricultural crops, 2) destruction or degradation of habitat mainly due to wild fire, 3) overexploitation of species mainly by unsustainable fishing, 4) water pollution, 5) river flow modification with implantation of small hydroelectric plants, 6) unsustainable tourism, and 7) introduction of invasive exotic species.

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“…Authors as Suzuki et al (2009), for example, emphasize the importance of these two subsystems for spawning and early development of juveniles, especially of migratory species, as well as obtaining food and shelter. Moreover, these two subsystems are characterized by having greater richness and diversity of speciesin addition to high catch individuals in relation to the Paraná subsystem, indicating higher habitat quality (Fernandes et al, 2009).…”

Section: Methodsmentioning

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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Effects of the hydrological regime on the ichthyofauna of riverine environments of the Upper Paraná River floodplain

Cited by 80 publications

References 25 publications

Influence of hydrology on the fish body condition in a large subtropical floodplain

Influence of hydrology on the fish body condition in a large subtropical floodplain

A conservation agenda for the Pantanal's biodiversity

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

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