Seasonal fluctuation of some limnological variables on a floodplain lake (Patos lagoon) of the Upper Paraná River, Mato Grosso do Sul State, Brazil

Rodrigues, Luzia Cleide; Train, Sueli; Roberto, Maria do Carmo; Pagioro, Thomaz Aurélio

doi:10.1590/s1516-89132002000600014

Cited by 22 publications

(24 citation statements)

References 6 publications

(5 reference statements)

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“…As a further result, these events reduce the primary productivity of phytoplankton (Train and Rodrigues, 1998;Rodrigues et al, 2002) and of submerged macrophytes (Padial and Thomaz, 2008;Thomaz et al, 2009), affecting the abundance and composition of the plankton (Velho et al, 2001;Ortlepp and Mürle, 2003) and the periphyton (Bielsa et al, 2003;Murakami et al, 2009). Thus, although the floods increase the availability of allochthonous food items from the flooded areas and drift, they reduce the autochtonous food supply.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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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“…Otherwise, in a river-floodplain system, such as that of the Mortes River, the periodic inundation and drought (flood pulse) is the driving force (Junk & Wantzen, 2003). It makes interactions between the aquatic and terrestrial environment possible (Junk et al, 1989), regulates the model of the aquatic communities (Quirós & Baigún, 1985;Townsend, 1996;Rodrigues et al, 2002), propitiates the high diversity of the lotic environment associated to the floodplain because of the elevated heterogeneity of the habitat (Luiz et al, 2004;Thomaz et al, 2007), including in clear water rivers (sensu Sioli, 1984), such as the Mortes River, characterized by a low concentration of nutrients, but that support a rich aquatic flora and fauna (Goulding, 1993). It also modifies the limnological characteristics of rivers because of the quantities of organic matter received from the floodplain (Townsend, 1996), and influences the fish-environmental parameter relationship (Lin & Caramaschi, 2005).…”

Section: Introductionmentioning

confidence: 99%

Influence of environmental parameters on fish assemblage of a neotropical river with a flood pulse regime, Central Brazil

2009

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This study aims to determine which of twelve environmental parameters (five physicochemical and seven hydromorphological) influence on the fish assemblage structure of the lower Mortes River basin located in the Bananal floodplain of the Araguaia River basin, Central Brazil. Sampling was conducted in six stretches of 1000 m each during the high and low waters. Fish were captured using gill nets and environmental parameters were measured by portable equipment or determined visually. The coinertia analysis indicated that two physicochemical (dissolved oxygen and water transparency), and four hydromorphological (channel width and depth, riparian vegetation cover and type of the riverside substrate) parameters structure the fish assemblages, both driven by the regional hydrological patterns (flood pulse). These results are explained by fish-environmental parameters relationship characteristic of the aquatic Neotropical systems.Este estudo determinou quais entre doze parâmetros ambientais (cinco físico-químicos e sete hidromorfológicos) influenciam na estrutura da assembleia de peixes do baixo rio das Mortes localizado na planície de inundação do Bananal, bacia do rio Araguaia, Brasil Central. As coletas foram realizadas em seis trechos de 1000 m cada durante os períodos de chuva e estiagem, nos quais 1036 peixes foram coletados utilizando-se redes de malhar e medidos os parâmetros ambientais utilizando equipamentos portáteis ou determinados visualmente. A análise de coinércia indicou que dois parâmetros físicos e químicos (oxigênio dissolvido e a transparência da água) e quatro hidromorfológicos (largura e profundidade da calha principal, cobertura da mata ripária e tipo de substrato da margem) estruturam a assembleia de peixes, ambos influenciados pelo regime hidrológico regional (pulso de inundação). Estes resultados são discutidos considerando a interação entre peixes e os parâmetros ambientais característicos dos sistemas aquáticos Neotropicais.

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“…In the December 2010 sampling of our study, the water level remained low and the available nutrients may have resulted from the prolonged process of decomposition and release from the same sediment (Lee & Bukaveckas, 2002;Yahdjian et al, 2006;Schönbrunner et al, 2012). Thus, local processes such as the resuspension of bottom sediments caused by the wind (Evans, 1994;Rodrigues et al, 2002) and disturbance from fish action, may contribute to the increase in nutrients in the water column (Breukelaar et al, 1994).…”

Section: Discussionmentioning

confidence: 79%

Body condition and energy density of juvenile streaked prochilod Prochilodus lineatus (Valenciennes, 1837) in a Neotropical floodplain

2016

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Variations in energetic density (E D ) and the relative condition factor (K n ) of juveniles of Prochilodus lineatus were investigated to identify whether these two variables respond similarly to environmental factors. We hypothesized that fluviometric levels in different sub-basins of the Upper Paraná River floodplain positively influence the E D and K n of juvenile fish. Temporally, the values of E D and K n were linked more directly to the dynamics of the flood pulses on the plain. Spatially, the lowest values of E D and K n were observed in the environment that was directly affected by the operation of dams, the sub-basin Paraná. Although the energy density and condition factor did not show similar results for juveniles in some of the analyses, the evaluation of both parameters provided a complementary tool and additional information that enabled a more accurate investigation of the temporal and spatial dynamic processes in this Neotropical floodplain. We conclude that water level variations in different sub-basins of the Upper Paraná River floodplain considerably affect the relative condition factor and energy status of P. lineatus. We suggest that the impacts of this modification should be mitigated or avoided in order to maintain fish stocks and promote ecosystem integrity.Variações na densidade energética (E D ) e no fator de condição relativo (K n ) de juvenis de Prochilodus lineatus foram investigadas buscando identificar se estas duas variáveis respondem de forma semelhante aos fatores ambientais. Nossa hipótese é que o nível fluviométrico, em diferentes subsistemas da planície de inundação do alto rio Paraná, influencia positivamente o E D e K n de juvenis da espécie. Temporalmente, os valores de E D e K n estiveram relacionados mais diretamente a dinâmica de pulsos de inundação presente na planície. Espacialmente, os menores valores de E D e K n foram verificados no ambiente mais diretamente afetado pela operação das barragens, o subsistema Paraná. Apesar da densidade de energia e do fator de condição não demonstrarem resultados semelhantes para juvenis em algumas das análises, a avaliação de ambos os parâmetros forneceu uma ferramenta complementar e informações adicionais, que permitiu uma investigação mais detalhada dos processos dinâmicos temporais e espaciais nesta várzea neotropical. Conclui-se que a variação do nível de água, em diferentes subsistemas da planície de inundação do alto rio Paraná, afeta consideravelmente a condição corpórea e energética de P. lineatus. Nós sugerimos que impactos que modifiquem este efeito devem ser mitigados ou evitados para manter o estoque de peixes e promover a integridade do ecossistema.

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Seasonal fluctuation of some limnological variables on a floodplain lake (Patos lagoon) of the Upper Paraná River, Mato Grosso do Sul State, Brazil

Abstract: ABSTRACT

Cited by 22 publications

References 6 publications

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

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

Influence of environmental parameters on fish assemblage of a neotropical river with a flood pulse regime, Central Brazil

Body condition and energy density of juvenile streaked prochilod Prochilodus lineatus (Valenciennes, 1837) in a Neotropical floodplain

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