Changes in the phytoplankton structure downstream a large reservoir: effects of tributaries on the assemblages attributes

Matsuura, Patricia; Perbiche‐Neves, Gilmar; Ferreira, Rosa Antonia Romero; Nogueira, Marcos Gomes

doi:10.1515/biolog-2015-0037

Cited by 13 publications

(7 citation statements)

References 22 publications

(20 reference statements)

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“…Additionally, temporal and spatial trends in the zooplankton community structure and composition were identified by comparing different regions during dry and rainy periods. The observed tendencies are consistent to simultaneous analyzes on phytoplankton communities (Matsuura et al, 2015). For the mentioned study the highest values of phytoplankton richness and alpha diversity were found in the two tributary rivers, with a corresponding increase in the Paran a River post-tributaries.…”

Section: Discussionsupporting

confidence: 89%

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Zooplankton community and tributary effects in free‐flowing section downstream a large tropical reservoir

Portinho¹,

Perbiche‐Neves²,

Nogueira³

2016

Internat. Rev. Hydrobiol.

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This study aimed to evaluate the zooplankton structures and environmental conditions in the interface reservoir‐downstream river and tributaries. Zooplankton structure and environmental variables were analyzed in the lacustrine zone of Itaipu Reservoir and downstream this dam at Paraná River and in two lateral tributaries. A total of nine sites were sampled in July 2009 and January 2010 (winter/dry vs. summer/wet). In the free‐flowing section downstream of the Itaipu Reservoir (Paraná River), the physical–chemical influence of the dammed water can persist for approximately 15 km in the dry period and 30 km in the rainy period. The lateral tributaries (Iguaçu and Monday Rivers) introduce sediments (particulate organic and inorganic matter), nutrients and potamoplankton biota that contribute to fluvial restoration, particularly in the dry period when the main river flow is low. The zooplankton community structure and composition varied over space (longitudinal) and time. Rotifers dominated in the lateral tributaries, whereas microcrustaceans from the reservoir were abundant in the Paraná River. The density of zooplankton downstream of the reservoir decreased, with the highest reduction occurring in the first 5 km downstream of the dam, however, the species composition persisted in the all free‐flowing section downstream studied. Associations were found among zooplankton abundance and environmental variables, mainly the current velocity and water discharge; zooplankton groups had different responses to these variables. Differences in the zooplankton ecological structure along a stretch of the Paraná River clearly indicate the effects of damming and tributaries.

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Section: Discussionsupporting

confidence: 89%

“…Higher phytoplankton biomass above the dam (Matsuura et al, 2015) is also an important biotic factor contributing for larger reservoir zooplankton populations compared to lotic conditions.…”

Section: Discussionmentioning

confidence: 99%

Zooplankton community and tributary effects in free‐flowing section downstream a large tropical reservoir

Portinho¹,

Perbiche‐Neves²,

Nogueira³

2016

Internat. Rev. Hydrobiol.

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“…dam. In this case, there is a transference of low oxygenated waters, disturbing the limnological and biota rehabilitation of bellow dam river stretches, whose importance has already been evidenced [29][30][31][32]. However, this recovery process may not be effective in reservoir cascades, where the distance between consecutive reservoirs is too short.…”

Section: Inter-reservoir Variabilitymentioning

confidence: 99%

Limnological Patterns in a Large Subtropical Reservoir Cascade

Nogueira¹,

Pomari²

2019

Limnology - Some New Aspects of Inland Water Ecology

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The study identified limnological patterns in the Paranapanema River reservoir cascade, one of the main tributaries of the high Paraná River, La Plata Basin, southeast Brazil. Samplings were carried out in eight reservoirs from a total of 37 sites. We analyzed the water transparency, depth, and vertical profiles of temperature, pH, conductivity, dissolved oxygen, biochemical oxygen demand, total solids, suspended solids, total nitrogen, total phosphorus, chlorophyll a, and thermotolerant coliforms. Additionally, the trophic state index for tropical/subtropical reservoirs, the water retention time and morphometric characteristics of each reservoir were calculated. Longitudinal compartmentalization is conspicuous in storage reservoirs, whereas the magnitude of temporal changes is higher in run-of-river systems. The lateral component of spatial heterogeneity was also very important for some reservoirs, determined basically by the entrance of tributary rivers. On the vertical dimension, summer thermal stratification, followed by oxygen decrease in bottom layers, in the central channel and lacustrine zones of deeper and larger reservoirs was observed. The ultraoligotrophic condition prevailed, despite signals of intensive land use for agriculture-recurrent high phosphorus values. The acquired experience provided a baseline for a permanent limnological and water quality program, which subsidizes management actions in the basin.

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“…However, the presence of a sufficiently long and undammed stretch and lateral sources of energy and matter are necessary (Stanford & Ward, 2001). Thus, sources of contribution such as tributaries (Matsuura et al, 2015;Portinho et al, 2016) and the floodplain, may cooperate for the physical, chemical and biological water characteristics to return to values close to those observed prior to the disruption of the river continuity. Nevertheless, depending on the magnitude of the impact and the geographic location of the fragmentation on the longitudinal axis of the river, some signs of disturbance may persist indefinitely (Stanford & Ward, 2001).…”

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confidence: 98%

Phytoplankton community in the last undammed stretch of the Paraná River: considerations on the distance from the dam

et al. 2017

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Aim: To evaluate the influence of upstream reservoirs on the temporal and spatial variation of the phytoplankton community in the Paraná River channel and the importance of its main tributaries in reducing the oligotrophication process along this stretch of the river. Materials and Methods Sampling of phytoplankton and physical and chemical variables was performed quarterly between August 2013 and May 2015, in the Paraná River main channel and in the mouth of the main tributaries, at the stretch located between downstream Porto Primavera reservoir and the backwaters of Itaipu reservoir. To summarize the variation of phytoplankton density in relation to the main physical and chemical variables, we performed a Redundancy Analysis (RDA). Results A total of 214 taxa were identified throughout the study. We registered low values of phytoplankton species richness and abundance, which showed no patterns of temporal and spatial distribution, both for the Paraná River and the tributaries. However, RDA results showed spatial segregation among samples from the Paraná River main channel, such that the stretch located closer to the dam was associated with higher values of water transparency and Cyanobacteria density, exported by upstream reservoirs, whereas the middle and lower stretches were associated with higher phytoplankton complexity and higher nutrient concentration and turbidity. Conclusion Through the analysis of the phytoplankton community we could verify a reduction in the effects of oligotrophication along the longitudinal axis of the Paraná River and the important role of the tributaries in diminishing this effect.

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Changes in the phytoplankton structure downstream a large reservoir: effects of tributaries on the assemblages attributes

Cited by 13 publications

References 22 publications

Zooplankton community and tributary effects in free‐flowing section downstream a large tropical reservoir

Zooplankton community and tributary effects in free‐flowing section downstream a large tropical reservoir

Limnological Patterns in a Large Subtropical Reservoir Cascade

Phytoplankton community in the last undammed stretch of the Paraná River: considerations on the distance from the dam

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