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Costa RA, Ferragut C. Epipelon biomass responses to different restoration techniques in a eutrophic environment. ENVIRONMENTAL MANAGEMENT 2023:10.1007/s00267-023-01811-2. [PMID: 36964450 DOI: 10.1007/s00267-023-01811-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 03/13/2023] [Indexed: 06/18/2023]
Abstract
Eutrophication is a worldwide problem. In eutrophic 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 phosphorus retention by autotrophic organisms. This study evaluated epipelon responses to four 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, flocculant, floating macrophytes, and periphyton bioreactor. Water and epipelon samples were taken on days 3, 10, 17, 27, and 60. The aeration treatment and macrophytes decreased light availability in 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, resulting in less efficient 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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Affiliation(s)
- Renata Aparecida Costa
- Programa de Pós-graduação em Biodiversidade Vegetal e Meio Ambiente, Instituto de Pesquisas Ambientais, Av. Miguel Stéfano, 3687, Água Funda, CEP 04301-902, São Paulo, SP, Brasil.
| | - Carla Ferragut
- Programa de Pós-graduação em Biodiversidade Vegetal e Meio Ambiente, Instituto de Pesquisas Ambientais, Av. Miguel Stéfano, 3687, Água Funda, CEP 04301-902, São Paulo, SP, Brasil
- Instituto de Pesquisas Ambientais, Núcleo de Conservação da Biodiversidade, Av. Miguel Stéfano, 3687, Água Funda, CEP 04301-902, São Paulo, SP, Brasil
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de Oliveira Carneiro R, Ferragut C. Simulating oligotrophication in a eutrophic shallow lake to assess the effect of periphyton bioreactor on phytoplankton and epipelon. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:26545-26558. [PMID: 36367647 DOI: 10.1007/s11356-022-23999-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 10/31/2022] [Indexed: 06/16/2023]
Abstract
We evaluated the effects of a periphyton bioreactor on phytoplankton by experimentally simulating oligotrophication in a shallow eutrophic system. The experiment had two 50% diluted treatments with and without a periphyton bioreactor. Sampling was performed on days 6, 9, 12, 15, and 20 of the experimental period. The periphyton bioreactor accumulated biomass (chlorophyll-a, AFDM) and TP during the experimental period. Despite the biomass and TP loss due to periphyton detachment from the substrate after community reaching the algal biomass peak, the gains exceeded the losses, and the net rate was positive for all attributes in the bioreactor. Based on the average, our findings suggest that periphyton bioreactors negatively affected the phytoplankton total biovolume. Cyanobacteria were the most abundant phytoplankton group. However, the periphyton bioreactor caused the biomass loss of the Raphidiopsis raciborskii in phytoplankton. Our results suggest that bioreactor influenced the phytoplankton structure, reducing cyanobacterial biomass, especially Raphidiopsis raciborskii. However, the bioreactor did not reflect a significant increase in the epipelon biomass during the experimental period. We conclude that the periphyton bioreactor has the potential to assist in the maintenance of restored shallow lakes and reservoirs, especially in controlling phytoplankton growth.
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Affiliation(s)
- Ruan de Oliveira Carneiro
- Programa de Pós-Graduação Em Biodiversidade Vegetal E Meio Ambiente, Instituto de Pesquisas Ambientais, Av. Miguel Stéfano, 3687, Água Funda, São Paulo, SP, CEP 04301-902, Brazil
| | - Carla Ferragut
- Programa de Pós-Graduação Em Biodiversidade Vegetal E Meio Ambiente, Instituto de Pesquisas Ambientais, Av. Miguel Stéfano, 3687, Água Funda, São Paulo, SP, CEP 04301-902, Brazil.
- Núcleo de Conservação da Biodiversidade, Instituto de Pesquisas Ambientais, Av. Miguel Stéfano, 3687, Água Funda, São Paulo, SP, CEP 04301-902, Brazil.
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Fonseca BM, Levi EE, Jensen LW, Graeber D, Søndergaard M, Lauridsen TL, Jeppesen E, Davidson TA. Effects of DOC addition from different sources on phytoplankton community in a temperate eutrophic lake: An experimental study exploring lake compartments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 803:150049. [PMID: 34500271 DOI: 10.1016/j.scitotenv.2021.150049] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 08/10/2021] [Accepted: 08/27/2021] [Indexed: 06/13/2023]
Abstract
A mesocosm experiment was conducted in a temperate eutrophic lake with the hypotheses: 1) the addition of a labile form of DOC would trigger a more pronounced response in phytoplankton biomass and composition compared with a non-labile form; 2) DOC addition would increase phytoplankton biomass by co-inserting organic nutrients for phytoplankton growth; 3) DOC addition would change phytoplankton composition, in particular towards mixotrophic taxa due to higher DOC availability; and that 4) there would be differences in phytoplankton responses to DOC addition, depending on whether sediment was included or not. We used two types of mesocosms: pelagic mesocosms with closed bottom, and benthic mesocosms open to the sediment. The experiment ran for 29 days in total. The DOC addition occurred once, at Day 1. Besides the control, there were two treatments: HuminFeed® (non-labile DOC) at a concentration of 2 mg L-1, and a combination of 2 mg L-1 HuminFeed® and 2 mg L-1 DOC from alder leaf leachate (labile). Responses were detected only in the treatment with alder leaf extract. Ecosystem processes responded immediately to DOC addition, with the fall in dissolved oxygen and pH indicating an increase in respiration, relative to primary production (Day 2). In contrast, there was a delay of a few days in structural responses in the phytoplankton community (Day 6). Phytoplankton biomass increased after DOC addition, probably boosted by the phosphorus released from alder leaf extract. Changes in phytoplankton composition towards mixotrophic taxa were not as strong as changes in biomass, and happened only in the pelagic mesocosms. With the DOC addition, diatoms prevailed in benthic mesocosms, while the contribution of colonial buoyant cyanobacteria increased in the pelagic ones. This study points towards the necessity to look in greater detail at specific responses of phytoplankton to DOC concentration increases considering lake-habitat and sediment influence.
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Affiliation(s)
- Bárbara Medeiros Fonseca
- Lake Ecology Section, Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark.
| | - Eti Ester Levi
- Lake Ecology Section, Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; WATEC Aarhus University Centre for Water Technology, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark.
| | - Lea Westphalen Jensen
- Lake Ecology Section, Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
| | - Daniel Graeber
- Dep. Aquatic Ecosystem Analysis, Helmholtz Centre for Environmental Research - UFZ, Brückstraße 3a, 39114 Magdeburg, Germany.
| | - Martin Søndergaard
- Lake Ecology Section, Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; WATEC Aarhus University Centre for Water Technology, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), Beijing, China.
| | - Torben Linding Lauridsen
- Lake Ecology Section, Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; WATEC Aarhus University Centre for Water Technology, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), Beijing, China.
| | - Erik Jeppesen
- Lake Ecology Section, Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; WATEC Aarhus University Centre for Water Technology, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), Beijing, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey; Institute of Marine Sciences, Middle East Technical University, Mersin, Turkey.
| | - Thomas Alexander Davidson
- Lake Ecology Section, Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; WATEC Aarhus University Centre for Water Technology, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark.
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Liu Y, Li C, Jian S, Miao S, Li K, Guan H, Mao Y, Wang Z, Li C. Hydrodynamics Regulate Longitudinal Plankton Community Structure in an Alpine Cascade Reservoir System. Front Microbiol 2021; 12:749888. [PMID: 34777298 PMCID: PMC8578721 DOI: 10.3389/fmicb.2021.749888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 09/20/2021] [Indexed: 11/21/2022] Open
Abstract
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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Affiliation(s)
- Yang Liu
- College of Eco-Environmental Engineering, Qinghai University, Xining, China.,State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, China
| | - Chengyan Li
- College of Eco-Environmental Engineering, Qinghai University, Xining, China
| | - Shenglong Jian
- Qinghai Provincial Fishery Environmental Monitoring Center, Xining, China.,The Key Laboratory of Plateau Aquatic Organism and Ecological Environment in Qinghai, Qinghai Provincial Fishery Environmental Monitoring Center, Xining, China
| | - Shiyu Miao
- College of Eco-Environmental Engineering, Qinghai University, Xining, China
| | - Kemao Li
- Qinghai Provincial Fishery Environmental Monitoring Center, Xining, China.,The Key Laboratory of Plateau Aquatic Organism and Ecological Environment in Qinghai, Qinghai Provincial Fishery Environmental Monitoring Center, Xining, China
| | - Hongtao Guan
- Qinghai Provincial Fishery Environmental Monitoring Center, Xining, China.,The Key Laboratory of Plateau Aquatic Organism and Ecological Environment in Qinghai, Qinghai Provincial Fishery Environmental Monitoring Center, Xining, China
| | - Yaqi Mao
- College of Eco-Environmental Engineering, Qinghai University, Xining, China
| | - Zhongyi Wang
- College of Eco-Environmental Engineering, Qinghai University, Xining, China
| | - Changzhong Li
- College of Eco-Environmental Engineering, Qinghai University, Xining, China.,State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, China
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