Epipelon, phytoplankton and zooplankton responses to the experimental oligotrophication in a eutrophic shallow reservoir

Amaral, Luyza Mayary; Castilho, Maria Carolina de Almeida; Henry, Raoul; Ferragut, Carla

doi:10.1016/j.envpol.2020.114603

Cited by 11 publications

(11 citation statements)

References 37 publications

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“…Abundance (1.8 × 10 5 cells/L) and biovolume (66.6 μg/L) of phytoplankton species in the alpine cascade reservoirs were low. This may be because the cascade reservoirs in the upstream are located on the Qinghai–Tibet plateau, where growth and reproduction of phytoplankton are significantly inhibited by high altitude, low water temperature, and low phosphorus levels ( Amaral et al, 2020 ). Oligotrophic aquatic systems with low species number and biovolume of phytoplankton and simple ecosystem structure are vulnerable to external factors.…”

Section: Discussionmentioning

confidence: 99%

“…Higher nitrogen and phosphorus levels promote growth of phytoplankton. Previous studies report that phytoplankton biomass changes in response to nutrient availability mainly in oligotrophic conditions ( Özkan et al, 2016 ; Wang et al, 2018 ; Amaral et al, 2020 ). However, some studies report that bioavailable nitrogen and phosphorus are weakly correlated with phytoplankton biomass ( Beaver et al, 2013 ; Okuku et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies on phytoplankton or zooplankton in individual reservoir reported that hydrology, nutrient availability, and biota interactions were the main controlling factors of plankton composition and biomass in reservoirs ( Rangel et al, 2012 ; Beaver et al, 2013 ; Chang et al, 2014 ; Silva et al, 2014 ; Amaral et al, 2020 ). However, the detailed relationship between plankton community and these environmental factors was reservoir specific and more complex since conflicting results were reported ( Beaver et al, 2013 ; Silva et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics Regulate Longitudinal Plankton Community Structure in an Alpine Cascade Reservoir System

Liu

Sheng-long

et al. 2021

Front. Microbiol.

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Previous studies report significant changes on biotic communities caused by cascade reservoir construction. However, factors regulating the spatial–temporal plankton patterns in alpine cascade reservoir systems have not been fully explored. The current study explored effects of environmental factors on the longitudinal plankton patterns, through a 5-year-long study on the environmental factors and communities of phytoplankton and zooplankton in an alpine cascade reservoir system located upstream of Yellow River region. The findings showed that phytoplankton and zooplankton species numbers in the studied cascade reservoir system were mainly regulated by the hydrological regime, whereas nutrient conditions did not significantly affect the number of species. Abundance and biovolume of phytoplankton in cascade reservoirs were modulated by the hydrological regime and nutrient conditions. The drainage rate, N:P ratio, and sediment content in cascade reservoirs were negatively correlated with abundance and biovolume of phytoplankton. Abundance and biovolume of zooplankton were not significantly correlated with the hydrological regime but showed a strong positive correlation with nutrient conditions in cascade reservoirs. Shannon–Wiener index (H’) and the Pielou index (J) of phytoplankton were mainly regulated by the hydrological regime factors, such as drainage rate and sediment content in cascade reservoirs. However, temperature and nutrient conditions were the main factors that regulated the Shannon–Wiener index (H’) and the Pielou index (J) of zooplankton. Species number, abundance, and biovolume of phytoplankton showed a significant positive correlation with those of zooplankton. Hydrodynamics and nutrient conditions contributed differently in regulating community structure of phytoplankton or zooplankton. These findings provide an understanding of factors that modulate longitudinal plankton community patterns in cascade reservoir systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics Regulate Longitudinal Plankton Community Structure in an Alpine Cascade Reservoir System

Liu

Sheng-long

et al. 2021

Front. Microbiol.

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“…Thus, we hypothesized that periphyton is limited by P even in a hypereutrophic reservoir. For the dilution experiment, we consider that oligotrophication tends to reduce the N:P ratio and phytoplankton biomass (Schindler et al, 2016, Amaral et al, 2020, which can control the periphyton growth (Borduqui et al, 2012). For eutrophic conditions, our second hypothesis is that nutrient dilution can increase biomass and change the algal community structure in periphyton.…”

Section: Palabras Clave: Especies De Algas; Sustrato Artificial; Biom...mentioning

confidence: 99%

“…Distilled water was used to dilute the eutrophic water and was added slowly to avoid resuspension of the sediment. More details can be found in Amaral et al (2020).…”

Section: Experimental Designsmentioning

confidence: 99%

Periphyton responses to enrichment and nutrient dilution in two mesocosm experiments in a shallow hypereutrophic reservoir

Carneiro¹,

Ferragut²

2023

Limnetica

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Periphyton can contribute to maintaining oligotrophic conditions in restored shallow lakes and reservoirs. In two mesocosm experiments, we evaluated the periphyton responses to enrichment and nutrient dilution in a hypereutrophic reservoir. Effects of the isolated and combined N and P enrichment and dilution levels on periphyton biomass and structure on artificial substrate were investigated. For colonization of periphyton, glass slides were exposed for 14 days (enrichment experiment) and 21 days (dilution experiment) at 20 cm deep. We monitored the effects of N and P enrichment and dilution on the algal biomass, density, and species composition in the periphyton. P was a primary limiting factor for periphyton development. Periphyton algal density and biomass increased in response to combined and isolated P enrichment. Only the 75 % dilution had a positive and significant effect on biomass and algal density in the periphyton. In both mesocosm experiments, the periphyton structure changed, with Nitzschia palea (Kutz.) Smith responding positively to P enrichment and negatively to dilution. Achnanthidium minutissimum Complex becoming dominant following 50 % and 75 % eutrophic water dilution. Our results suggest that major environmental changes are necessary for a heterogeneous algal community structure in the periphyton in hypereutrophic con¬ditions. We conclude that, after a restoration process that reduces P-competition with phytoplankton and shading, periphyton can become an important primary producer in a hypereutrophic reservoir.

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Epipelon biomass responses to different restoration techniques in a eutrophic environment

Costa

Ferragut

2023

Environmental Management

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Eutrophication is a worldwide problem. In eutrophic shallow lakes, phosphorus release from stored sediment hinders restoration processes. The epipelon is a community that grows attached to the sediment surface and has the potential to help P retention by autotrophic organisms. This study evaluated epipelon responses to four shallow lake restoration techniques. The responses of abiotic variables and phytoplankton biomass were also evaluated. Four simultaneous mesocosm experiments were performed in a shallow eutrophic lake. The applied techniques were aeration, occulant, oating macrophytes, and periphyton bioreactor. Water and epipelon samples were taken on days 3, 10, 17, 27, and 60. The aeration treatment and macrophytes shaded the epipelon, which had a predominance of heterotrophic components. Flocculant and periphyton bioreactor treatments favored epipelon growth with a higher contribution of autotrophic components. Therefore, some techniques may favor the epipelon growth, while others may harm the community in restoration processes. For the complete restoration of a lacustrine ecosystem, the choice of techniques to be applied must consider the restoration and maintenance of the benthic environment.

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Epipelon, phytoplankton and zooplankton responses to the experimental oligotrophication in a eutrophic shallow reservoir

Cited by 11 publications

References 37 publications

Hydrodynamics Regulate Longitudinal Plankton Community Structure in an Alpine Cascade Reservoir System

Hydrodynamics Regulate Longitudinal Plankton Community Structure in an Alpine Cascade Reservoir System

Periphyton responses to enrichment and nutrient dilution in two mesocosm experiments in a shallow hypereutrophic reservoir

Epipelon biomass responses to different restoration techniques in a eutrophic environment

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