Spatial and temporal distribution of ichthyoplankton in the upper Uruguay river, Brazil

Hermes-Silva, Samara; Reynalte‐Tataje, David Augusto; Zaniboni‐Filho, Evoy

doi:10.1590/s1516-89132009000400017

Cited by 40 publications

(39 citation statements)

References 10 publications

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“…Although the larvae caught have not been identified, apparently, the species are looking for these tributaries, mainly located in the right margin, as migratory routes. A similar phenomenon was observed by Hermes-Silva et al (2009), the upper Uruguay River, where the authors report that the largest catches of eggs in the tributaries and regards them as alternative migration routes. According to these authors, the presence of dams contributes to the reduction in catches of eggs and larvae in the Uruguay River.…”

Section: Discussionsupporting

confidence: 77%

“…An increase in body temperature increases the kinetic energy of atoms and molecules, facilitating chemical reactions and inter and intramolecular bonds, which modifies the equilibrium of reactions between proteins (enzymesubstrate, hormone-receptor for example) (Baldisserotto, 2002). The highest reproductive intensity of most species in the upper Paraná River (Vazzoler, 1996) and upper Uruguay River (Hermes-Silva et al, 2009) occurs between October and January, when water temperature are highest.…”

Section: Discussionmentioning

confidence: 99%

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Spatial and temporal distribution patterns of ichthyoplankton in a region affected by water regulation by dams

Gogola¹,

Daga²,

Silva³

et al. 2010

Neotrop. ichthyol.

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at 24 sampling sites. For analytical purposes, the sampling sites were grouped into upper, middle and lower areas. The upper area of the National Park had the highest egg density and should be considered the primary spawning area. The middle area should be considered a drift area, and the lower area likely functions as a growth and feeding habitat. Statistical analyses showed that the spawning was influenced by water temperature, pH, fluviometric level and rainfall, and that larval density was influenced by pH, conductivity, dissolved oxygen and rainfall. The results also revealed that the tributaries apparently are used as migratory routes by fish, and and this shows the need to protect these sites.O objetivo deste trabalho foi estudar a ocorrência de ictioplâncton em uma região sob influência de barragens. A área de estudo está localizada na região do Parque Nacional de Ilha Grande, planície de inundação do Alto Rio Paraná. Especificamente, analisamos a distribuição temporal e espacial do ictioplâncton, identificando áreas de desova e estabelecendo relações entre a abundância de ovos e larvas de peixes e algumas variáveis limnológicas e hidrológicas. Amostras foram coletadas mensalmente entre outubro e março de 2001 a 2005 em 24 pontos de amostragem. Para fins de análise as estações de amostragens foram agrupadas em área superior, média e inferior. A parte superior da área do Parque Nacional apresentou a maior densidade de ovos e pode ser considerada como local de desova, enquanto que a área central pode ser considerada local de deriva, e a área inferior funciona como um provável local de crescimento e alimentação das larvas. As análises estatísticas mostraram que as desovas foram influenciadas pela temperatura da água, pH, nível fluviométrico e precipitação, e que a densidade de larvas foi influenciada pelo pH, condutividade, oxigênio dissolvido e precipitação. Os resultados também revelaram que os afluentes aparentemente são utilizados como rotas migratórias de peixes, e isso demonstra a necessidade de proteção destes locais.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Spatial and temporal distribution patterns of ichthyoplankton in a region affected by water regulation by dams

Gogola¹,

Daga²,

Silva³

et al. 2010

Neotrop. ichthyol.

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“…Studies have confirmed the existence of spawning in the region (Reynalte-Tataje et al, 2008a;Hermes-Silva et al, 2009), and more recently, Silva et al (2012) observed local growth and spawning of fish in a tributary located in this region.…”

Section: Introductionmentioning

confidence: 76%

Pools and rapids as spawning and nursery areas for fish in a river stretch without floodplains

2014

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This study aimed to evaluate the importance of two environments situated in the main channel of the Peixe River (a tributary of the upper Uruguay River) on fish reproduction and initial growth. Ichthyoplankton, macrozooplankton, and zoobenthos collections were taken on a monthly basis from October 2011 to March 2012, sampling a rapids and a pool environment. The instrument used for the capture of the ichthyoplankton in both environments was a light trap. In total, 795 eggs and 274 larvae were captured. The species that presented higher abundance and occurrence frequency out of the total captured in both environments were Leporinus obtusidens, Bryconamericus iheringii, and Bryconamericus stramineus. The evaluation of the feeding activity reveals a major repletion degree of the larvae in more advanced stages in the pool. The pool environment presented a higher abundance of larvae in more advanced development stages. We conclude that the channel of the Peixe River is important for the reproduction and initial growth of fish and that each river environment seems to fulfill a different role in the life cycle of the ichthyoplankton community.Este trabalho avaliou a importância de dois ambientes situados no canal principal do rio do Peixe (afluente do alto rio Uruguai) na reprodução e crescimento inicial dos peixes. As coletas de ictioplâncton, macrozooplâncton e zoobentos foram realizadas mensalmente no período de outubro de 2011 a março de 2012, amostrando um ambiente de corredeira e um ambiente de poço. O instrumento utilizado para a captura do ictioplâncton nos dois ambientes foi a armadilha luminosa. No total, foram capturados 795 ovos e 274 larvas. As espécies que apresentaram maior abundância e frequência de ocorrência do total capturado nos dois ambientes foram Leporinus obtusidens, Bryconamericus iheringii e Bryconamericus stramineus. A avaliação da atividade alimentar revela um maior grau de repleção das larvas em estágios mais avançados no ambiente de poço. O ambiente de poço apresentou uma maior abundância de larvas nos estágios mais avançados de desenvolvimento. Conclui-se que o canal do rio do Peixe é importante para a reprodução e crescimento inicial de peixes e que cada ambiente do rio parece cumprir um papel diferente no ciclo de vida da comunidade ictioplanctônica.

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“…The proportion of individuals caught in Itá reservoir was higher than expected, and the average number of individuals was more than two times higher in Itá than in Machadinho reservoir, even standardizing fishing effort. Ichthyoplankton studies conducted in the upper Uruguay River region (Hermes-Silva et al, 2009;Reynalte-Tataje et al, 2012c) have shown that the reproductive activity of fish is much more intense in the area of Itá reservoir than of Machadinho. The scarcity of lotic environments located upstream Machadinho Dam has been credited as one of the factors that reduces reproductive activity (Hermes-Silva et al, 2009) and, consequently, interferes in the abundance of adult fish in this environment when compared with the Itá environment (Reynalte-Tataje et al, 2012c).…”

Section: Discussionmentioning

confidence: 99%

Effects of reservoirs water level variations on fish recruitment

2017

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The construction of hydroelectric power plants has many social and environmental impacts. Among them, the impacts on fish communities, which habitats are drastically modified by dams, with consequences across the ecosystem. This study aimed to assess the influence of water level (WL) variations in the reservoirs of the Itá and Machadinho hydroelectric plants on the recruitment of fish species from the upper Uruguay River in southern Brazil. The data analyzed resulted from the WL variation produced exclusively by the hydroelectric plants generation and were collected between the years 2001 and 2012. The results showed significant correlations between the abundance of juvenile fish and the hydrological parameters only for some reproductive guilds. The species that spawn in nests showed, in general, a clear preference for the stability in the WL of the reservoirs, while the species that spawn in macrophytes or that release demersal eggs showed no significant correlation between the abundance of juvenile fish and hydrological parameters. A divergence of results between the two reservoirs was observed between the species that release semi-dense eggs; a positive correlation with a more stable WL was only observed in the Machadinho reservoir. This result can be driven by a wider range of WL variation in Machadinho reservoir.Keywords: Hydrological Parameters, Itá, Juveniles, Machadinho, Reproduction, Uruguay River.A construção de usinas hidrelétricas implica em diversos impactos sociais e ambientais. Dentre esses, o impacto causado sobre a comunidade de peixes, cujos habitats são drasticamente modificados pelas barragens, causam consequências em todo o ecossistema. Este trabalho teve como objetivo avaliar a influência da variação dos níveis de água dos reservatórios das usinas hidrelétricas de Itá e Machadinho sobre o recrutamento das espécies de peixes do alto rio Uruguai, sul do Brasil. Os dados analisados resultaram da variação de nível de água decorrente exclusivamente da operação da usina e foram coletados entre os anos de 2001 e 2012. Os resultados mostraram correlações significativas entre a abundância dos juvenis de peixes e os parâmetros hidrológicos apenas para determinadas guildas reprodutivas. As espécies que desovam em ninhos mostraram, em geral, uma clara preferência pela estabilidade do nível de água dos reservatórios, enquanto que as espécies que desovam em macrófitas ou que liberam ovos demersais não mostraram correlação significativa entre a abundância de juvenis com os parâmetros hidrológicos. Uma divergência de resultados entre os dois reservatórios foi observada entre as espécies que liberam ovos semi-densos, onde apenas no reservatório de Machadinho houve correlação positiva com a maior estabilidade do nível de água. Esse resultado pode ser motivado pela maior amplitude de variação do nível de água no reservatório de Machadinho quando comparado com o de Itá.

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Spatial and temporal distribution of ichthyoplankton in the upper Uruguay river, Brazil

Abstract: ABSTRACT

Cited by 40 publications

References 10 publications

Spatial and temporal distribution patterns of ichthyoplankton in a region affected by water regulation by dams

Spatial and temporal distribution patterns of ichthyoplankton in a region affected by water regulation by dams

Pools and rapids as spawning and nursery areas for fish in a river stretch without floodplains

Effects of reservoirs water level variations on fish recruitment

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