Effect of slackwater areas on the establishment of plankton communities (testate amoebae and rotifers) in a large river in the semi-arid region (Northeastern Brazil)

Picapedra, P H S; Fernandes, Cleomar; Baumgartner, Gilmar; Lansac‐Tôha, Fábio Amodêo

doi:10.23818/limn.37.03

Limnetica

2018

DOI: 10.23818/limn.37.03

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Effect of slackwater areas on the establishment of plankton communities (testate amoebae and rotifers) in a large river in the semi-arid region (Northeastern Brazil)

P H S Picapedra¹,

Cleomar Fernandes²,

Gilmar Baumgartner³

et al.

Abstract: Effect of slackwater areas on the establishment of plankton communities (testate amoebae and rotifers) in a large river in the semi-arid region of northeastern BrazilThe increase in discharge of rivers over time and space poses challenges to the establishment of some biotas, because of higher turbulence, turbidity, hydraulic forces and limited food sources, which may directly affect the community structure. In this context, slackwater areas play an important role in the establishment of organisms, acting as re… Show more

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2023

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Cited by 2 publications

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Zooplankton as an indicator of hydrological connectivity of the main channel and the floodplain in a large river system

Yanygina,

Burmistrova,

Kotovshchikov

et al. 2023

Hydrobiologia

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The connectivity of the river–floodplain system during floods plays a decisive role in organisms/matter contribution to the ecosystems of large lowland rivers. We hypothesized that the direction of water-level trends during flood was crucial for zooplankton release from the floodplain into the river channel. The seven-year study of zooplankton in the large plain Ob river suggest that at the inundated floodplain even a slight water level fall brings to plankton release from the floodplain into the river thus causing its abundance boom in the main channel. At water-level stabilization or rise, zooplankton communities of floodplain become isolated from the channel that ceases the recruits’ inflow from the floodplain and brings to a sharp drop in number of river zooplankton. Therefore, it is necessary to take into account dynamics trends (i.e., fall or rise) in river water level when assessing zooplankton density in large lowland rivers. The analysis of such trends should become the basis for predicting of river zooplankton abundance and assessing changes in feeding conditions of fish during the growing season.

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Zooplankton as an indicator of hydrological connectivity of the main channel and the floodplain in a large river system

Yanygina,

Burmistrova,

Kotovshchikov

et al. 2023

Hydrobiologia

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Effects of urbanization on the diversity of testate amoebae (Protist, Rhizopoda) in a stream of the southwestern Amazon basin (Igarapé São Francisco in Acre state, Brazil)

Gonçalves Araujo,

Sampaio Cabral,

Corrêa

et al. 2023

Acta Protozool.

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We investigated the diversity of testate amoebae in an urban stream located within the Igarapé São Francisco Environmental Protection Area in Acre, northern Brazil, during the dry season, and evaluated the factors mediating the structure of this protist community. We collected 108 water samples for the analysis of the testate amoeba community and the limnological variables at six sampling points on the stream, between July and September 2018. We used a Redundancy Analysis (RDA) to verify the influence of environmental variables on the protist community. We recorded 76 species of testate amoebae from eight families, with most records from the families Difflugiidae, Arcellidae, Centropydae and Netzeliidae. More than half (49) of the species were recorded in Acre for the first time. The abundance of the amoebae of the family Trigonopiridae was regulated by the dissolved oxygen concentrations and the pH, while that of the Netzeliidae, Dif-flugiidae and Lesquereusidae was influenced by the pH, chloride concentrations, and the depth and transparency of the water. In the case of the family Arcellidae, abundance was determined by the turbidity and transparency of the water and the nitrate concentrations, while that of Centropyxis sp. was associated with the concentrations of thermotolerant coliforms. These findings indicate that, while the São Francisco stream is subject to anthropogenic impacts, it still presents adequate conditions for these organisms in some of its stretches. The abundance of these amoebae was influenced primarily by the productivity of the system, as indicated by the high protist densities recorded in the areas in which primary productivity was highest. These findings support the use of these protists in studies that investigate the most appropriate indicator organisms that respond to anthropogenic impacts and shifts in environmental quality.The results of the present study demonstrated the importance of this aquatic ecosystem for the biodiversity of the study area, and the need to further expand our knowledge on the adaptations and interactions of the aquatic communities of the Amazon region.

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Effect of slackwater areas on the establishment of plankton communities (testate amoebae and rotifers) in a large river in the semi-arid region (Northeastern Brazil)

Cited by 2 publications

References 32 publications

Zooplankton as an indicator of hydrological connectivity of the main channel and the floodplain in a large river system

Zooplankton as an indicator of hydrological connectivity of the main channel and the floodplain in a large river system

Effects of urbanization on the diversity of testate amoebae (Protist, Rhizopoda) in a stream of the southwestern Amazon basin (Igarapé São Francisco in Acre state, Brazil)

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