Spatial and temporal variation of the ichthyoplankton in a subtropical river in Brazil

Reynalte‐Tataje, David Augusto; Agostinho, Ângelo Antônio; Bialetzki, Andréa; Hermes-Silva, Samara; Fernandes, Rodrigo; Zaniboni‐Filho, Evoy

doi:10.1007/s10641-011-9955-3

Cited by 40 publications

(36 citation statements)

References 21 publications

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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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Section: Discussionmentioning

confidence: 99%

Effects of reservoirs water level variations on fish recruitment

2017

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“…Some studies have shown that environmental variables are the main determinants of ichthyoplankton abundance, structure and composition variation (Keckeis et al, 2000;Reynalte-Tataje et al, 2012). However, the effect of dams on the ichthyoplankton community is rarely investigated (Humphries & Lake, 2000;Sanches et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Temporal variability of fish larvae assemblages: influence of natural and anthropogenic disturbances

et al. 2012

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Natural and induced disturbances greatly influence the temporal distribution of ichthyoplankton abundance. This study assesses and compares the temporal variability of fish larvae assemblages in controlled and free environments to determine the influence of environment variables on the main taxa in these systems. The study was conducted at the Chapecó (without dam impact) and Ligeiro (with dam impact) river mouths, which are located in the upper Uruguay River. Samples were made between October 2001 and March 2004 during three reproductive periods. The larvae assemblages were composed of small and medium-sized Characiformes and Siluriformes. The variation in the distribution of larvae was mainly temporal (>85%). When the three reproductive periods were compared, it was observed in the second period, characterized by a larger water flow and a lower temperature, that there was a reduction in abundance, a lower number of taxa, an absence of stages in post-flexion and a high dissimilarity in larvae assemblage structure. In general, the environmental variables of water flow and temperature most influenced the distribution of egg and larvae abundance. In the studied area, a smaller temporal variability was observed in the structure of larvae assemblages at the sampling sites in the Chapecó River mouth than in in the Ligeiro River mouth under the influence of dams.Os distúrbios naturais e induzidos têm notável influência na distribuição temporal da abundância do ictioplâncton. Este estudo visa avaliar e comparar a variabilidade temporal das assembleias de larvas de peixes, entre ambientes regulados e ambientes livres, bem como, determinar a influência das variáveis ambientais sobre os principais táxons presentes nestes ambientes. O trabalho foi conduzido na foz dos rios Chapecó (sem impacto de barramento) e Ligeiro (impactado por barragens), ambos localizados no alto rio Uruguai. As coletas foram realizadas entre outubro de 2001 e março de 2004 durante três períodos reprodutivos. As assembléias de larvas estiveram compostas principalmente por Characiformes e Siluriformes de pequeno e médio porte. A variação na distribuição de larvas foi principalmente temporal (>85%). Quando comparados os três períodos reprodutivos, foi observado que no segundo período, caracterizado por uma maior vazão da água e menor temperatura, houve redução na abundância, menor número de táxons, ausência de estágios em pós-flexão e elevada dissimilaridade na estrutura da assembléia de larvas. Em geral, as variáveis ambientais vazão e temperatura da água foram as que mais influenciaram a distribuição da abundância de ovos e larvas. Nos ambientes estudados, foi observado que existe uma menor variabilidade temporal na estrutura das assembléias de larvas das estações presentes na foz do rio Chapecó do que naquelas presentes na foz do rio Ligeiro, o qual esta sob influência dos barramentos.

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“…Turbid waters are essential for the survival of fish eggs and larvae as they decrease visual predation (Agostinho et al, 2002). In the Uruguay River basin, Reynalte-Tataje et al (2012a) reported similar results and suggested that low densities downstream of dams indicate low reproductive activity influenced by water quality and flow control, with an abundance improvement only one hundred and thirty kilometers downstream of the dam. In the Upper Parana River, this effect also seems to be minimized near the Ivinheima River, about ninety kilometers downstream of Porto Primavera, where the abundances were comparatively greater, confirming the importance of this river for this stretch of the basin.…”

Section: Discussionmentioning

confidence: 86%

“…These tributaries, in addition to maintaining the reproduction events, have still contributed with the input of larvae to the downstream stretches. Numerous studies carried out in this basin Daga et al, 2009;Gogola et al, 2010;Reynalte-Tataje et al, 2011Da Silva et al, 2015;Silva et al, 2016) and in the basins of the rivers Uruguay (Reynalte-Tataje et al, 2008, 2012aHermes-Silva et al, 2009;Corrêa et al, 2011) and São Francisco (Sato et al, 2005;Weber et al, 2013;Normando et al, 2014;Nunes et al, 2015), as well as in other parts of the world (Bottcher et al, 2013;Webber et al, 2013;López-Casas et al, 2016), have argued for the importance of free-flowing tributaries upstream of regulated rivers as alternative migratory routes. Nevertheless, it is important to emphasize the need for an adequate distance between the spawning site and the complete early embryonic and larval development, preventing the drift of larvae to inappropriate places, such as reservoirs, where they can be preyed upon or settle to the substrate Olden, 2016).…”

Section: Discussionmentioning

confidence: 99%

Importance of dam-free stretches for fish reproduction: the last remnant in the Upper Paraná River

et al. 2017

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Aim: This study uses the abundance of fish eggs and larvae to evaluate the importance of the main channel of the Paraná River and the adjacent areas of the floodplain, in the last dam-free stretch in the Brazilian territory, for the spawning and development of fish of different reproductive guilds, in order to obtain subsidies to assist in the management and conservation policies of this area, focusing on the maintenance of dam-free areas. Methods: Data were taken quarterly from August 2013 to May 2015, in 25 sites, grouped into three biotopes: main channel, tributaries and lagoons. Possible spatial variations in fish spawning and development as well as composition and structure of larvae were evaluated. Results: Higher densities of eggs were found in tributaries (Paracaí and Amambai rivers) and greater densities of larvae were observed in lagoons (Saraiva). Significant differences in composition and structure of larvae were detected only between sampling stations. As for taxonomic composition, 29 taxa were recorded, mostly non-migratory. However, long-distance migratory were also widely distributed, such as Brycon orbignyanus, Pseudoplatystoma corruscans, Prochilodus lineatus, Piaractus mesopotamicus and Rhaphiodon vulpinus, as well as invasive species Platanichthys platana and Hemiodus orthonops. In turn, Salminus brasiliensis presented low occurrence. Conclusions: This study evidenced that different species spawn in the region, mainly in tributaries, and their eggs and larvae are transported to the main channel of the Paraná River and adjacent lagoons, to complete their early development. The capture of larvae of important migratory species suggests that this environment still exhibits suitable conditions for their reproduction, mainly due to the presence of dam-free tributaries. Also, they emphasize the importance of the integrity of these environments for the maintenance of the regional fish fauna, and it is extremely important the monitoring of reproduction of the most endangered species, as well as of invasive species.

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Spatial and temporal variation of the ichthyoplankton in a subtropical river in Brazil

Cited by 40 publications

References 21 publications

Effects of reservoirs water level variations on fish recruitment

Effects of reservoirs water level variations on fish recruitment

Temporal variability of fish larvae assemblages: influence of natural and anthropogenic disturbances

Importance of dam-free stretches for fish reproduction: the last remnant in the Upper Paraná River

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