Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain

Petry, Ana Cristina; Abujanra, Fabiane; Gomes, Luiz Carlos; Júlio, Horácio Ferreira; Agostinho, Ângelo Antônio

doi:10.1590/s1679-62252013005000008

Cited by 14 publications

(7 citation statements)

References 41 publications

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“…Although the synchrony of high river stages and high temperatures is an integral part of the flood pulse/aquatic productivity relationship (Junk et al , ; Gorski et al , ), extended summer flooding in the ARBF leads to pervasive hypoxia, reducing the potential benefits of floodplain inundation in this system (Rutherford et al , ; Alford and Walker, ). Fishes have a variety of mechanisms to cope with hypoxia (Chapman et al , ), but the combination of high temperatures and chronically low DO levels in the ARBF is likely stressful for most aquatic organisms, resulting in altered behaviour, physiology, growth, survival, and production (Kelso et al , ; Pollock et al , ; Vanderploeg et al , ; Bonvillain et al , ; Petry et al , ).…”

Section: Discussionmentioning

confidence: 99%

Predicting Floodplain Hypoxia in the Atchafalaya River, Louisiana, USA, a Large, Regulated Southern Floodplain River System

Pasco

Kaller

Harlan

et al. 2015

River Research & Apps

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The Atchafalaya River Basin Floodway (ARBF), a regulated river/floodplain distributary of the Mississippi River, experiences an annual flood pulse that strongly influences floodplain physicochemistry. We developed several metrics to investigate the relationship between the timing and magnitude of the flood pulse and floodplain hypoxia, which in most years is a spatially extensive and temporally prolonged problem in the lower ARBF. Principal components analysis of flood metrics from 2001 to 2009 revealed contrasting flood types (early cool and late warm), but component‐based general linear models were unable to predict the magnitude of hypoxia in ARBF water management areas (WMAs). Further analyses based on temperature and geographic information system‐determined WMA inundation with generalized additive models (GAMs) revealed WMA‐specific patterns of hypoxia, but the likelihood of hypoxia consistently increased when temperatures approached 20°C and inundation rose above 20–30%. Validation with held‐out data based on logistic regression indicated that the models constructed with the 2001–2009 temperature and inundation data were able to accurately predict the probabilities of hypoxia in two WMAs based on data collected from 2010 to 2013. The GAMs were an effective tool for visualizing and predicting the probability of hypoxia based on two easily generated parameters. Our analyses indicate that modification of the Atchafalaya River flood pulse could reduce the magnitude of hypoxia within the lower ARBF, subject to engineering (control structure operation) and economic (commercial fisheries production) constraints, by minimizing floodplain inundation after water temperatures reach 20°C. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Predicting Floodplain Hypoxia in the Atchafalaya River, Louisiana, USA, a Large, Regulated Southern Floodplain River System

Pasco

Kaller

Harlan

et al. 2015

River Research & Apps

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“…Most existing studies in Brazil were conducted in other river basins, especially in the Paraná River Basin (Agostinho et al, 2004a;Agostinho et al, 2004b;Fernandes et al, 2009;Gubiani et al, 2010;Petry et al, 2013). There is a lack of studies assessing the influence of water levels variations on the neotropical ichthyofauna located in a subtropical region, such as the upper Uruguay River.…”

Section: E160084[2]mentioning

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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“…Clearly, more research on how exactly DO impacts fish life histories, in particular their reproductive traits, is needed. Nonetheless, it is also possible that the effects reported here are indirect effectsmediated by predationas the two piscivorous fishes in this system are tolerant to low-oxygen conditions (Petry et al, 2013). Low DO might increase predation risk (e.g.…”

Section: Effects Of Do Food Availability and Phmentioning

confidence: 88%

Phenotypic differentiation in a heterogeneous environment: morphological and life‐history responses to ecological gradients in a livebearing fish

et al. 2019

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Predicting how environmental variation drives phenotypic diversification is one of the main aims of evolutionary ecology. Yet, we still only have a limited understanding of how it drives diversity, especially when multiple factors interact. To address this issue, the superfetating livebearing fish Phalloptychus januarius (Poeciliidae) was repeatedly sampled (over a 2-year period) in four coastal lagoons in Brazil to investigate the relative contribution of different environmental factors on phenotypic patterns. We further compare our results to those reported for another poeciliid (Poecilia vivipara), which inhabits some of the same lagoons but has a drastically different reproductive strategy (no superfetation). We used a model-averaging approach to estimate the relative importance of differences in predation pressure, salinity, dissolved oxygen, pH, temperature and food availability in driving variation in body shape, life histories, and life-history proxies. We found consistent population differences in several traits, but also seasonal variation within each lagoon. Specifically, predation, oxygen availability and pH affected several different traits and played important roles in driving phenotypic differences between and amongst populations. Moreover, our study reveals differential responses in phenotypic traits to the same environmental gradients between P. januarius (this study) and P. vivipara (previous studies), and we suggest that future work should further investigate differential phenotypic responses to single versus multiple concomitant selective forces, and how this affects different species.

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Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Parana River floodplain

Cited by 14 publications

References 41 publications

Predicting Floodplain Hypoxia in the Atchafalaya River, Louisiana, USA, a Large, Regulated Southern Floodplain River System

Predicting Floodplain Hypoxia in the Atchafalaya River, Louisiana, USA, a Large, Regulated Southern Floodplain River System

Effects of reservoirs water level variations on fish recruitment

Phenotypic differentiation in a heterogeneous environment: morphological and life‐history responses to ecological gradients in a livebearing fish

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