Effects of flooding regime on the feeding activity and body condition of piscivorous fish in the Upper Paraná River floodplain

Luz-Agostinho, Kdg.; Agostinho, A.A.; Gomes, Luiz Carlos; Julio-Jr., H. F.; Fugi, Rosemara

doi:10.1590/s1519-69842009000300004

Cited by 50 publications

(37 citation statements)

References 30 publications

(38 reference statements)

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“…It may be highlighted that the occurrence of high water levels during summer, which has been related to the spawning success of migratory species (Godoy, 1975;Agostinho et al, 1993;Vazzoler, 1996), may be less important to recruitment of juveniles into adult stocks if the floods have short du-year 2000 corroborate this hypothesis. Studies conducted by Abujanra et al (2009) andLuz-Agostinho et al (2009) indicate that the natural alternation between dry and flood years is fundamental to these species. During dry years, species improve their nutritional conditions (reserves), which may be used in subsequent years for successful migration and spawning.…”

Section: Discussionmentioning

confidence: 94%

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

et al. 2009

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In this work, spatial and temporal variations in the diversity (species richness and Simpson's Diversity Index) and abundance (indexed by the capture per unit effort -CPUE; total and for reproductive groups) of fish from three rivers (Baía, Ivinheima and Paraná) located in a floodplain of the Upper Paraná River basin were analyzed over a period of 20 years . In addition, we evaluated the relationships of these ecological attributes with variations in the hydrologic regime, considering the possible effects of natural (climatic events) and artificial (discharge control by dams) disturbances. Annual variations in hydrometric attributes were calculated using PULSO software and daily water level data. We applied analysis of covariance to determine the relationships between ecological and hydrometric attributes, the latter summarized in axes of a principal component analysis. Lower values of the fish assemblage attributes (diversity and abundance) were registered in the Paraná River. Species richness, total CPUE and CPUE of long-distance migratory species were positively related to the duration of the floods and the connectivity of the area. Variations in the annual hydrological cycle and their effects on fish assemblage appear to be affected by extreme natural (ENSO) and artificial (discharge control by dams) events.Keywords: floods, recruitment, abundance, fish diversity, fish assemblage. Efeitos do regime hidrológico sobre a ictiofauna de ambientes fluviais da planície de inundação do Alto Rio Paraná ResumoNesse trabalho foi avaliada a variação espaço-temporal na diversidade (riqueza de espécies e Índice de Diversidade de Simpson) e abundância (indexada pela captura por unidade de esforço -CPUE; total e por grupo reprodutivo) de espécies de peixes de três rios (Baía, Ivinheima e Paraná), localizados na planície de inundação do Alto Rio Paraná, ao longo de 20 anos . Ainda, avaliamos as relações desses atributos ecológicos (diversidade e abundân-cia) à variação anual do regime hidrológico, considerando a influência de distúrbios naturais (eventos climáticos) e artificiais (regulação hidrológica por barragens). Para representar a variação anual do regime hidrológico de cada rio, foram utilizados os atributos hidrométricos calculados pelo programa PULSO, a partir de medidas do nível hidromé-trico diário. Análise de covariância foi aplicada para avaliar a relação entre os atributos ecológicos das assembléias de peixes e a variação no regime hidrológico, esta sumarizada em eixos de uma análise de componentes principais. A riqueza de espécies, a CPUE total e a de migradores de longa distância foram relacionadas positivamente à duração das cheias e conectividade, sendo que o Rio Paraná apresentou os menores valores médios desses atributos. Dessa forma, as variações constatadas no ciclo hidrológico anual e seus reflexos sobre a estrutura das assembléias de peixes do rio Paraná parecem decorrer do efeito combinado de eventos naturais (El Niño -ENSO) e artificiais (controle da vazão pelas barragens).Palavras-chave: ch...

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Section: Discussionmentioning

confidence: 94%

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

et al. 2009

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“…The data for river levels of the Baía River, whose fish assemblage is also analyzed in this study, were surrogated using the Paraná River level because their variation was similar to the Baía, which has a nearby and parallel course, and has surface contact with the Baía during major floods (Luz-Agostinho et al, 2009). foram similares entre os subsistemas, divergindo no período subseqüente, e que em anos com cheias incipientes ou nulas a condição nutricional foi elevada, especialmente nos subsistemas influenciados pelo represamento a montante. As correlações de Pearson e Spearman revelaram que, pelo menos parte dos atributos das cheias foram adversos para os peixes de diferentes categorias tróficas, exceto a variabilidade anual dos níveis fluviométricos, que possibilitou às espé-cies herbívoras o acesso periódico a fontes de alimento externas.…”

Section: Methodsunclassified

Section: Methodsmentioning

confidence: 99%

“…Uma análise de variância (ANOVA bifatorial) revelou variações significantes na condição nutricional média dos peixes, tanto entre subsistemas e ciclos hidrológicos, como em suas interações. Os resultados evidenciaram que antes do represamento, as variações na condição nutricional dos peixes gime (involving periods before and after the construction of the Porto Primavera Reservoir) on features related to the intensity of food intake and the body condition of the fish species have been accomplished only for piscivorous fish (Luz-Agostinho et al, 2009). Based on the assumption that the flood pulses alter the composition, quantity, and quality of food resources available to the fish, and the assumption that the characteristics of the water released from the reservoirs undergoes changes related to the transport and sedimentation processes, it is postulated that inter-annual variations in the attributes of the floods (duration, time of year, intensity, and variability) affect the body conditions of fish differently, according to their food habits and the particular environment, independently of the amount of food ingested.…”

Section: Influência Do Regime De Cheias Na Condição Corporal De Peixementioning

confidence: 99%

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Effects of the flood regime on the body condition of fish of different trophic guilds in the Upper Paraná River floodplain, Brazil

Abujanra

Agostinho

2009

Braz. J. Biol.

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In this study, we evaluated the influence of various hydrological cycles on the feeding body condition of fish species of different trophic guilds in the Paraná River floodplain, as well as the impacts of upstream impoundments on fish conditions. Attributes of the river floods (duration, time of year, intensity, and variability in a given year) and the body condition, measured by the mean residuals of length-weight ratios, of the detritivorous, herbivorous, insectivorous, invertivores, omnivorous, piscivorous, and planktivorous species were evaluated. Fish were sampled during a period before (1986-1994) and after (2000-2004) the completion of filling of the Porto Primavera Reservoir, which is located upstream from the floodplain area under study. Three sub-basins in the floodplain were sampled: the Ivinheima River, which has no dams; the Paraná River, which has several dams; and the Baia River, which is influenced by the Paraná. A two-way ANOVA identified significant variations in mean body conditions for localities and for the hydrological cycles, and the interactions were also significant. The findings revealed that before the Porto Primavera Reservoir was filled, the body condition of the feeding guilds varied similarly in the three sub basins, but this pattern was not observed after filling was completed. However, in years with minor or no floods, the body condition was high, especially in the sub-basins influenced by Porto Primavera (Paraná and Baía). Pearson's and Spearman's correlations showed that most effects of the floods were unfavorable to the body condition of the guilds, except for the annual variation in water level, which aids herbivores in accessing allochthonous food resources. Detritivores were negatively affected by all flood attributes. A correlation between the relative stomach weight (mean residual of the ratio of total and stomach weights) and the body condition demonstrated the poor relationship between the amount of food intake and weight gain; insectivores were the exception, showing a significant negative correlation. Therefore, for this guild, there is evidence that their food sources during floods have low nutritional value. It is hypothesized that dry years lead to improvement in the nutritional quality of food resources, and that the water released from the upstream dam dilutes and removes these resources without providing new food inputs. This exacerbates the effects of floods on body conditions. Keywords: condition factor, nutritional condition, flood pulses, floodplain, regulated rivers. Influência do regime de cheias na condição corporal de peixes de diferentes guildas troficas na planície de inundação do Alto Rio Paraná, Brazil ResumoNesse estudo, buscou-se avaliar a influência de diversos ciclos hidrológicos sobre a condição nutricional de peixes de diferentes categorias tróficas, na planície alagável do alto rio Paraná, bem como dos impactos de represamentos a montante, sobre esse processo. Para isso foram avaliados os atributos das cheias anuais (duração, época, i...

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“…Few of these traits are associated with the trophic nature of the ichthyofauna (Luz-Agostinho et al, 2009). Some of those studies focus on the nutritional state of the fauna but are mono-specific (Gomes, Agostinho, 1997), only related to a particular trophic group (LuzAgostinho et al, 2008), or include species of a unique genus (Jepsen et al, 1999).…”

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.

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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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Effects of flooding regime on the feeding activity and body condition of piscivorous fish in the Upper Paraná River floodplain

Cited by 50 publications

References 30 publications

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

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

Effects of the flood regime on the body condition of fish of different trophic guilds in the Upper Paraná River floodplain, Brazil

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

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