Impact of reservoirs on zooplankton diversity and implications for the conservation of natural aquatic environments

Simões, Nadson Ressyé; Nunes, Ariádine H.; Dias, Juliana Déo; Lansac‐Tôha, Fábio Amodêo; Velho, Luiz Felipe Machado; Bonecker, Cláudia Cósta

doi:10.1007/s10750-015-2260-y

Cited by 67 publications

(36 citation statements)

References 64 publications

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“…This tendency of lower values of total phosphorous concentrations and turbidity in sampling sites closer to Porto Primavera reservoir is certainly related to the effects of upstream reservoir cascades causing several alterations downstream, such as the reduction in the transport of suspended matter transport, decrease in nutrient concentrations causing oligotrophication, increase in water transparency, and discontinuity of physical and chemical characteristics (Barbosa et al, 1999). These effects have been widely reported as possible causes of changes in the aquatic biota (Istvánovics et al, 2010;Bortolini et al, 2016) and have been observed for the Upper Paraná River floodplain (Agostinho et al, 2008;Mantovano et al, 2015;Simões et al, 2015) and other reservoirs in the world (Ney, 1996).…”

Section: Discussionmentioning

confidence: 91%

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: Discussionmentioning

confidence: 91%

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

et al. 2017

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“…To determine the frequency of each species occurrence and subsequently its adaptation to each hydrological phase, we calculated the frequency index according to Simões et al (2015).…”

Section: Discussionmentioning

confidence: 99%

“…To determine the frequency of each species occurrence and subsequently its adaptation to each hydrological phase, we calculated the frequency index according to Simões et al (). Aggregation by functional feeding guilds (microfilter‐feeders, mIff ; macrofilter‐feeders, mAff ; and predators, Pr ) was conducted according to Karabin () and reflects different food quality and particle sizes.…”

Section: Methodsmentioning

confidence: 99%

Hydrology driven changes in the rotifer trophic structure and implications for food web interactions

2017

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Rotifers display r‐strategy life‐histories and are adaptable to environmental disturbances. Although rotifers constitute a large proportion of zooplankton in river‐floodplain systems, the influence of hydrology on their assemblage has been poorly studied. We postulated that rotifer assemblage and grazing activities were controlled by mechanisms associated with hydrological conditions. We conducted a 5‐year study (Kopački Rit Nature Park, NE Croatia) to assess the influence of hydrology on (a) rotifer assemblage during different hydrological phases, (b) the vertical distribution of rotifer abundance, functional feeding guilds, and grazing intensity, and (c) the main drivers affecting rotifer assemblage in the floodplain lake. The results indicated that (a) during isolation, longer residence time and high phytoplankton biomass microfilter‐feeders (mIff) and macrofilter‐feeders (mAff) grazing rates were similar whereas predators (Pr) were the most efficient consumers, (b) during high flow pulses, high conductivity and variable water level governed rotifer grazing rates of mIff and mAff at a retion of 1:2 and a decline of Pr grazing activity, and (c) during the flood pulse, reduced phytoplankton biomasss still resulted in mAff and Pr domination of the community whereas mIff grazing activity remained at the same level. Under stable hydrological conditions algivorous species codominated with bacterivores and predators, suggesting an increased biodiversity and food web interactions. In contrast, throughout the inundation period, algivorous species predominated. However, differences in rotifer assemblage between normal flow and flood pulses indicated the importance of hydrology in shaping rotifer trophic structure through modifying lower trophic levels and the availability of food sources.

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“…Floodplain lakes are important to supply and maintain ecosystem services, such as primary productivity (Beeton, 2002;Junk, 2002;Simões et al, 2015). Moreover, the environmental and biological heterogeneity found in floodplains makes them important conservation areas (Agostinho et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Rivers affect the biovolume and functional traits of phytoplankton in floodplain lakes

et al. 2017

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Aim:We analyzed the temporal distribution (dry and rainy periods) of phytoplankton functional groups (biovolume) from lakes connected to dammed (S1 -Paraná River) and non-dammed rivers (S2 -Baia River and S3 -Ivinhema River) in the upper Paraná River floodplain, Brazil. We also determined the drivers of the phytoplankton community assemblage. Methods: Phytoplankton and environmental variables samplings were performed quarterly in dry (2000 and 2001) and rainy (2010 and 2011) periods. We classified the phytoplankton species into seven morphological based functional groups (MBFG). We used analysis of variance to test differences in total phytoplankton biovolume and MBFGs biovolume between lakes and climatic periods. We also used redundancy analysis to determine the MBFGs-environment relation. Results: The lake related to the dammed river (S1) presented the lowest species richness. The total phytoplankton biovolume presented differences among the lakes, but we did not register temporal differences associated with water level variation. The lake related to the non-dammed and semi-lentic river (S2) presented the highest biovolume, while S1 (related to the dammed river) and S3 (related to the non-dammed river) exhibited the lowest ones. Filamentous organisms (MBFG III) were associated with poor nutrient conditions and diatoms (MBFG VI) were favored in high water mixing sites. The flagellate groups MBFG II and MBFG V were related to deeper water and lower column mixing conditions, respectively. Conclusions: Our results suggest that phytoplankton species with different functional traits drive the primary productivity in the dry and rainy periods. Hence, we highlight the importance of maintaining high functional 2 Pineda, A. et al.

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Impact of reservoirs on zooplankton diversity and implications for the conservation of natural aquatic environments

Cited by 67 publications

References 64 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

Hydrology driven changes in the rotifer trophic structure and implications for food web interactions

Rivers affect the biovolume and functional traits of phytoplankton in floodplain lakes

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