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

Portinho, Jorge Laço; Perbiche‐Neves, Gilmar; Nogueira, Marcos Gomes

doi:10.1002/iroh.201501798

Cited by 34 publications

(29 citation statements)

References 26 publications

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“…This suggests that this predominance is determined by the influence of the upstream reservoir (Porto Primavera), which retain both nutrients and sediments (Agostinho et al, 2004a), promoting oligotrophication, considering that this is the last of a long series of reservoirs located at the Paraná River basin. Other authors also registered a similar pattern of calanoid abundance in lotic environments impacted by upstream reservoirs (Lopes et al, 1997;Portinho et al, 2016).…”

Section: Discussionsupporting

confidence: 55%

“…This decrease in abundance is probably caused by the influence of flow velocity in the stretch downstream of the reservoir (Mitsuka & Henry, 2002;Chang et al, 2008;Portinho et al, 2016). Thus, there is an expressive contribution of the reservoir fauna for the community structure immediately downstream of the reservoir, which frequently suffers a decrease along the dowstream stretch, which exhibits with lotic characteristics.…”

Section: Discussionmentioning

confidence: 99%

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Copepod assemblage structure (Crustacea: Copepoda) along a longitudinal environmental gradient in a tropical river-floodplain system, Brazil

et al. 2017

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Cite as: Palhiarini, W.S. et al. Copepod assemblage structure (Crustacea: Copepoda) along a longitudinal environmental gradient in a tropical river-floodplain system, Brazil. Acta Limnologica Brasiliensia, 2017, vol. 29, e102. Abstract: Aim: In this study, we analyzed the structure of the copepod community along a longitudinal axis of the last undammed stretch of the Upper Paraná River floodplain, downstream of Porto Primavera reservoir. We hypothesized that (i) copepod assemblage would show an increase in the abundance of organisms, species richness and specific diversity with the distance from the Porto Primavera reservoir, due to the arrival of species from adjacent lakes and tributaries; (ii) copepod abundance and species richness would be higher in tributaries and adjacent lakes located at the floodplain, which show higher environmental heterogeneity and function as a species source; and (iii) spatial patterns of copepod assemblage structure are related to the environmental gradient, since copepods show a rapid response to the variation of environmental conditions. Method: Sampling was performed quarterly from August 2013 to July 2014, at the subsurface of the pelagic region. Sampling sites were located along the Paraná River, in seven of its tributaries, and in eight lakes located in its floodplain. Results: We identified 29 species belonging to two families: Cyclopidae (21 species) and Diaptomidae (eight species). On contrary of our first hypothesis, ANOVA results showed a significant decrease in copepod abundance in the downstream direction. Similarly, the tributaries showed higher values of ecological attributes in the upstream stretch. RDA results showed that in axis 1, the Paraná River and the lakes were positively correlated with conductivity, pH, temperature and suspended organic matter, characterized by the most abundant copepod species. The tributaries, on the other hand, were negatively correlated with turbidity, total nitrogen, total phosphorus and depth. Axis 2 showed a positive correlation of the Paraná River with conductivity and suspended organic matter, and a higher abundance of Argyrodiaptomus azevedoi, Notodiaptomus iheringi, N. henseni, N. cearensis 2 Palhiarini, W.S. et al.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Copepod assemblage structure (Crustacea: Copepoda) along a longitudinal environmental gradient in a tropical river-floodplain system, Brazil

et al. 2017

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“…Agostinho et al, 2004b;Bovo-Scomparin et al, 2013). This effect would tend to increase along the longitudinal gradient, however, tributaries (without dams) and floodplains contribute organic and inorganic particulate matter to the river water, restoring the natural attributes that have been degraded by upstream reservoir regulation (Rice & Church, 2001;Stanford & Ward, 2001;Portinho et al, 2016). We observed a similar trend along the longitudinal gradient of the Paraná River in both banks (right and left), due the presence of several tributaries.…”

Section: Abiotic Variables and Environmental Heterogeneitysupporting

confidence: 70%

Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River

et al. 2017

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Cite as: Higuti, J. et al. Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River. Acta Limnologica Brasiliensia, 2017, vol. 29, e120. Abstract: Aim:We assessed the effect of environmental factors on the structure of periphytic ostracods communities along the river-floodplain system of the Upper Paraná River. We predict that the higher distance from Porto Primavera dam downstream would lead to higher diversity and density of the ostracods. Methods: Periphytic ostracods (associated with root systems of the floating Eichhornia spp) were sampled during November 2013 to May 2015. Three samples were collected at each sampling site (channel of the Paraná River, tributaries and lakes). Eichhornia plants were removed from the water by hand and the plants were placed in a plastic bucket. Roots were washed for the removal of ostracods, and samples were filtered through a hand net with 160 µm mesh size. Results: The faunistic survey recorded 44 ostracods species and richness estimators indicated that sampling effort appears to be suitable to reveal the diversity of ostracods in this studied area. The highest richness and density were observed in the stretch downstream of the dam in the main channel of Paraná River and in the lakes. Beta diversity was not significantly different along the longitudinal gradient downstream and higher similarity of ostracods species composition was observed in the lakes located in the stretch downstream of the dam. Conclusions: An increase in the richness and density of ostracods were recorded in the sections downstream of the Paraná River, evidencing the importance of undammed tributaries on the ostracods community. The similarity of beta diversity amongst sampling sites may be owing to permanent hydrological connectivity amongst these environments, favouring the exchange of organisms mainly through the drift of free-floating macrophytes, and owing to the passive dispersal of drought resistant eggs of ostracods. Local abiotic factors had significant effects on abundance and distribution of some ostracod species.

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“…Interestingly, the effect of damming on zooplankton communities on the end‐point comparison was minimal compared to most other observations in tropical impoundments. The introduction of a dam normally results in the creation of three distinct longitudinal zones: a riverine (lotic) zone, a transition zone and a lacustrine (lentic) zone (Wetzel, ), which has been shown previously to influence zooplankton communities (Bunn & Arthington, ; Portinho, Perbiche‐Neves, & Nogueira, ). However, in our study, the Madeira River retained high flows and short water residence time because it has a run‐of‐river dam.…”

Section: Discussionmentioning

confidence: 99%

Damming interacts with the flood pulse to alter zooplankton communities in an Amazonian river

et al. 2019

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Flow modification of lotic ecosystems is one of the main threats to global freshwater biodiversity. Commonly, and in the river studied here, modification results from hydroelectric dam installation. We evaluated the impacts of damming on zooplankton communities in the Amazonian floodplain of the Madeira River (Porto Velho, Rondônia, Brazil) following construction in 2012 of the run‐of‐river dam of Jirau Hydroelectric Power Plant. Using data sampled between 2009 and 2015, we tested for discontinuities in zooplankton community composition attributable to damming and the naturally occurring flood pulse. The flood pulse remained the main predictor explaining variation in zooplankton community structure even with the installation of the dam on the Madeira River. Despite this, discontinuities for the entire zooplankton community and for the main compositional groups (testate amoebae, rotifers, cladocerans, and copepods) were detected in relation to the dam (pre‐/post‐dam periods), mainly in ebb and low water, and with weaker evidence of dam effects during flood and highwater hydrological periods. A multivariate regression tree explained 9.6% of the variation in zooplankton communities and identified four groups: (1) flood and high‐water periods; (2) low water post‐dam; (3) low water pre‐dam; and (4) ebb hydrological periods. The deviance in each multivariate regression tree node was attributable to variation in eight rotifer, three testate amoeba, and three copepod taxa. Our study demonstrates that the flood pulse, dam construction, and interaction between both of these factors affect zooplankton community structure in the Madeira River. While for many zooplankton community variables, effects occurred mainly during ebb and low‐water periods, some effects were also observed during high water and flood periods. We thus recommend the establishment of a permanent environmental monitoring programme during all hydrological periods in tropical floodplain rivers and the addition of sampling sites downstream from dams. Many rivers in the world are increasingly disrupted by multiple dams, yet little is known of their effects, especially for run‐of‐river dams. Our study identified short‐term impacts of only one run‐of‐river dam on zooplankton communities. More research is needed on the effects of multiple run‐of‐river dams on zooplankton and other biota, especially in tropical floodplain rivers, so that negative effects can be understood and ameliorated.

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

Cited by 34 publications

References 26 publications

Copepod assemblage structure (Crustacea: Copepoda) along a longitudinal environmental gradient in a tropical river-floodplain system, Brazil

Copepod assemblage structure (Crustacea: Copepoda) along a longitudinal environmental gradient in a tropical river-floodplain system, Brazil

Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River

Damming interacts with the flood pulse to alter zooplankton communities in an Amazonian river

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