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Sagua MI, Nuozzi G, Sánchez ML, Huber P, Perdomo S, Schiaffino MR. Unraveling the effect of land use on the bacterioplankton community composition from highly impacted shallow lakes at a regional scale. FEMS Microbiol Ecol 2023; 99:fiad109. [PMID: 37715304 DOI: 10.1093/femsec/fiad109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 09/06/2023] [Accepted: 09/14/2023] [Indexed: 09/17/2023] Open
Abstract
Bacterioplankton communities play a crucial role in global biogeochemical processes and are highly sensitive to changes induced by natural and anthropogenic stressors in aquatic ecosystems. We assessed the influence of Land Use Land Cover (LULC), environmental, and geographic changes on the bacterioplankton structure in highly connected and impacted shallow lakes within the Salado River basin, Buenos Aires, Argentina. Additionally, we investigated how changes in LULC affected the limnological characteristics of these lakes at a regional scale. Our analysis revealed that the lakes were ordinated by sub-basins (upper and lower) depending on their LULC characteristics and limnological properties. In coincidence, the same ordination was observed when considering the Bacterioplankton Community Composition (BCC). Spatial and environmental predictors significantly explained the variation in BCC, although when combined with LULC the effect was also important. While the pure LULC effect did not explain a significant percentage of BCC variation, the presence of atrazine in water, an anthropogenic variable linked to LULC, directly influenced both the BCC and some Amplicon Sequence Variants (ASVs) in particular. Our regional-scale approach contributes to understanding the complexity of factors driving bacterioplankton structure and how LULC pervasively affect these communities in highly impacted shallow lake ecosystems from the understudied Southern Hemisphere.
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Affiliation(s)
- Mara I Sagua
- Departamento de Ciencias Básicas y Experimentales, Universidad Nacional del Noroeste de la Provincia de Buenos Aires, Roque Saez Pena 456 (6000), Junín, Buenos Aires, Argentina
- Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires (CIT NOBA) - UNNOBA-UNSAdA-CONICET, Monteagudo 2772 (2700), Pergamino, Buenos Aires, Argentina
| | - Guillermina Nuozzi
- Departamento de Ciencias Básicas y Experimentales, Universidad Nacional del Noroeste de la Provincia de Buenos Aires, Roque Saez Pena 456 (6000), Junín, Buenos Aires, Argentina
- Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires (CIT NOBA) - UNNOBA-UNSAdA-CONICET, Monteagudo 2772 (2700), Pergamino, Buenos Aires, Argentina
| | - María L Sánchez
- CONICET - Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Universidad de Buenos Aires, Intendente Guiraldes 2160 (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina
- Facultad de Ciencias Exactas y Naturales, Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Intendente Guiraldes 2160 (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina
| | - Paula Huber
- Instituto Nacional de Limnología (INALI, CONICET-UNL). Colectora RN 168 Km 0 (3000), Paraje El Pozo, Santa Fe, Argentina
- Departamento de Hydrobiologia, Universidade Federal de São Carlos (UFSCar). Rodovia Washington Luis S/N - Monjolinho (13565-905), São Carlos, São Paulo, Brazil
| | - Santiago Perdomo
- Departamento de Ciencias Básicas y Experimentales, Universidad Nacional del Noroeste de la Provincia de Buenos Aires, Roque Saez Pena 456 (6000), Junín, Buenos Aires, Argentina
- Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires (CIT NOBA) - UNNOBA-UNSAdA-CONICET, Monteagudo 2772 (2700), Pergamino, Buenos Aires, Argentina
| | - María R Schiaffino
- Departamento de Ciencias Básicas y Experimentales, Universidad Nacional del Noroeste de la Provincia de Buenos Aires, Roque Saez Pena 456 (6000), Junín, Buenos Aires, Argentina
- Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires (CIT NOBA) - UNNOBA-UNSAdA-CONICET, Monteagudo 2772 (2700), Pergamino, Buenos Aires, Argentina
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López Moreira Mazacotte GA, Polst BH, Gross EM, Schmitt-Jansen M, Hölker F, Hilt S. Microcosm experiment combined with process-based modeling reveals differential response and adaptation of aquatic primary producers to warming and agricultural run-off. Front Plant Sci 2023; 14:1120441. [PMID: 37404535 PMCID: PMC10316517 DOI: 10.3389/fpls.2023.1120441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 04/03/2023] [Indexed: 07/06/2023]
Abstract
Fertilizers, pesticides and global warming are threatening freshwater aquatic ecosystems. Most of these are shallow ponds or slow-flowing streams or ditches dominated by submerged macrophytes, periphyton or phytoplankton. Regime shifts between the dominance of these primary producers can occur along a gradient of nutrient loading, possibly triggered by specific disturbances influencing their competitive interactions. However, phytoplankton dominance is less desirable due to lower biodiversity and poorer ecosystem function and services. In this study, we combined a microcosm experiment with a process-based model to test three hypotheses: 1) agricultural run-off (ARO), consisting of nitrate and a mixture of organic pesticides and copper, differentially affects primary producers and enhances the risk of regime shifts, 2) warming increases the risk of an ARO-induced regime shift to phytoplankton dominance and 3) custom-tailored process-based models support mechanistic understanding of experimental results through scenario comparison. Experimentally exposing primary producers to a gradient of nitrate and pesticides at 22°C and 26°C supported the first two hypotheses. ARO had direct negative effects on macrophytes, while phytoplankton gained from warming and indirect effects of ARO like a reduction in the competitive pressure exerted by other groups. We used the process-based model to test eight different scenarios. The best qualitative fit between modeled and observed responses was reached only when taking community adaptation and organism acclimation into account. Our results highlight the importance of considering such processes when attempting to predict the effects of multiple stressors on natural ecosystems.
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Affiliation(s)
| | - Bastian H. Polst
- Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany
| | - Elisabeth M. Gross
- Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC) UMR 7360 CNRS, Université de Lorraine, Metz, France
- LTSER Zone Atelier Bassin de la Moselle, Metz, France
| | - Mechthild Schmitt-Jansen
- Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany
| | - Franz Hölker
- Department of Community and Ecosystem Ecology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
| | - Sabine Hilt
- Department of Community and Ecosystem Ecology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
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Li B, Wang J, Hu G, Liu X, Yu Y, Cai D, Ding P, Li X, Zhang L, Xiang C. Bioaccumulation Behavior and Human Health Risk of Polybrominated Diphenyl Ethers in a Freshwater Food Web of Typical Shallow Lake, Yangtze River Delta. Int J Environ Res Public Health 2023; 20:2671. [PMID: 36768037 PMCID: PMC9916311 DOI: 10.3390/ijerph20032671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/13/2023] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Polybrominated diphenyl ethers (PBDEs) have been commonly found in aquatic ecosystems. Many studies have elucidated the bioaccumulation and biomagnification of PBDEs in seas and lakes, yet few have comprehensively evaluated the bioaccumulation, biomagnification, and health risks of PBDEs in shallow lakes, and there is still limited knowledge of the overall effects of biomagnification and the health risks to aquatic organisms. METHODS In this study, a total of 154 samples of wild aquatic organism and environmental samples were collected from typical shallow lakes located in the Yangtze River Delta in January 2020. The concentrations of PBDEs were determined by an Agilent 7890 gas chromatograph coupled and an Agilent 5795 mass spectrometer (GC/MS) and the bioaccumulation behavior of PBDEs was evaluated in 23 aquatic organisms collected from typical shallow lakes of the Yangtze River Delta. Furthermore, their effects on human health were evaluated by the estimated daily intake (EDI), noncarcinogenic risk, and carcinogenic risk. RESULTS The concentrations of ΣPBDE (defined as the sum of BDE-28, -47, -100, -99, -153, -154, -183, and -209) in biota samples ranged from 2.36 to 85.81 ng/g lipid weight. BDE-209, BDE-153 and BDE-47 were the major PBDE congeners. The factors affecting the concentration of PBDEs in aquatic organisms included dietary habits, species, and the metabolic debromination ability of the PBDE congeners. BDE-209 and BDE-47 were the strongest bioaccumulative PBDE congeners in aquatic organisms. Additionally, except for BDE-99, BDE-153 and BDE-154, the trophic magnification factor (TMF) values of PBDE congeners were significantly higher than 1. Moreover, the log Kow played a significant role in the biomagnification ability of PBDE congeners. The noncarcinogenic risk of PBDE congeners and carcinogenic risk of BDE-209 from aquatic products were lower than the thresholds. CONCLUSIONS PBDE congeners were bioaccumulated and biomagnified to varying degrees in aquatic organisms from typical shallow lakes. Both the noncarcinogenic and carcinogenic risks assessment of edible aquatic products indicated that none of the PBDE congeners pose health risks to the localite. This study will provide a basis for a comprehensive assessment of PBDEs in aquatic ecosystems in shallow lakes and for environmental prevention measures for decision-makers.
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Affiliation(s)
- Bei Li
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, The Postgraduate Training Base of Jinzhou Medical University, Guangzhou 510530, China
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
| | - Juanheng Wang
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
- College of Resources and Environment, Yangtze University, Wuhan 430100, China
| | - Guocheng Hu
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, The Postgraduate Training Base of Jinzhou Medical University, Guangzhou 510530, China
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
| | - Xiaolin Liu
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, The Postgraduate Training Base of Jinzhou Medical University, Guangzhou 510530, China
| | - Yunjiang Yu
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
| | - Dan Cai
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
| | - Ping Ding
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
| | - Xin Li
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
| | - Lijuan Zhang
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
| | - Chongdan Xiang
- South China Institute of Environmental Sciences, Ministry of Ecology and Environment, The Postgraduate Training Base of Jinzhou Medical University, Guangzhou 510530, China
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510530, China
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Cai Y, Dong R, Kattel G, Zhang Y, Peng K, Gong Z. Macroinvertebrate diversity and ecosystem functioning across the eutrophication gradients of the middle and lower reaches of Yangtze River lakes (China). Ecol Evol 2023; 13:e9751. [PMID: 36699570 PMCID: PMC9846310 DOI: 10.1002/ece3.9751] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 12/23/2022] [Accepted: 01/04/2023] [Indexed: 01/19/2023] Open
Abstract
Biodiversity, which strengthens ecosystem stability, ecosystem function, and ecosystem services, is threatened by anthropogenic perturbation and climate change worldwide. However, despite the study of the role of biodiversity in multiple facets of freshwater ecosystems, the linkages between macroinvertebrates diversity and ecosystem functioning have not yet been well-assessed in eutrophication gradients of lowland river-floodplain systems. In this study, we have examined the relationship between macroinvertebrates diversity (species diversity, functional diversity, phylogenetic diversity) and macroinvertebrates biomass across the three typically featured eutrophication gradients: "MACROPHYTE," "TRANSITION," and "PHYTOPLANKTON," of floodplain lakes in the middle and lower reaches of the Yangtze River (China). Our results suggest that macroinvertebrates diversity in three different lacustrine conditions, biomass, and the relationship between diversity and biomass varied along eutrophication gradients. Functional richness and variance (divergence in taxon community) were the two important macroinvertebrate diversity indices, which accounted for the largest amount of variation in the biomass (63% in PHYTOPLANKTON lakes and 57% in MACROPHYTE lakes, respectively). We also found that the macrophyte coverage is more important than the relative abundance in maintaining the macroinvertebrates diversity and biomass in lowland Yangtze floodplain lake systems, while the relative abundance of macrophyte would change the BEF relationship. Our results demonstrate the functional performance of Yangtze River lakes, which would change with increased nutrient loading and decreased macrophyte coverage and would highlight the significance of the restoration of macrophytes to reduce nutrient loads.
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Affiliation(s)
- Yongjiu Cai
- Key Laboratory of Watershed Geographic SciencesNanjing Institute of Geography and Limnology, Chinese Academy of SciencesNanjingChina,University of Chinese Academy of SciencesBeijingChina
| | - Rui Dong
- Key Laboratory of Watershed Geographic SciencesNanjing Institute of Geography and Limnology, Chinese Academy of SciencesNanjingChina,University of Chinese Academy of SciencesBeijingChina
| | - Giri Kattel
- School of Geographical SciencesNanjing University of Information Science and TechnologyNanjingChina,Department of Infrastructure EngineeringThe University of MelbourneMelbourneVictoriaAustralia,Department of Hydraulic EngineeringTshinghua UniversityBeijingChina
| | - You Zhang
- Key Laboratory of Watershed Geographic SciencesNanjing Institute of Geography and Limnology, Chinese Academy of SciencesNanjingChina
| | - Kai Peng
- Key Laboratory of Watershed Geographic SciencesNanjing Institute of Geography and Limnology, Chinese Academy of SciencesNanjingChina
| | - Zhijun Gong
- Key Laboratory of Watershed Geographic SciencesNanjing Institute of Geography and Limnology, Chinese Academy of SciencesNanjingChina,University of Chinese Academy of SciencesBeijingChina
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Wu J, He Y, Zhao Y, Chen K, Cui Y, Wang H. A Simple Index of Lake Ecosystem Health Based on Species-Area Models of Macrobenthos. Int J Environ Res Public Health 2022; 19:9678. [PMID: 35955034 PMCID: PMC9367816 DOI: 10.3390/ijerph19159678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/01/2022] [Accepted: 08/03/2022] [Indexed: 06/15/2023]
Abstract
An effective biological index should meet two criteria: (1) the selected parameters have clear relationships with ecosystem health and can be measured simply by standard methods and (2) reference conditions can be defined objectively and simply. Species richness is a widely used estimate of ecosystem condition, although it is increased by nutrient enrichment, a common disturbance. Based on macrobenthos data from 91 shallow Yangtze lakes disconnected from the mainstem, we constructed an observed species (SO)-area (A) model to predict expected species richness (SE), and then developed an observed to expected index (O/E-SA) by calculating the SO/SE ratio. We then compared O/E-SA with three other commonly used indices regarding their ability to discriminate cultivated and urban lakes: (1) River Invertebrate Prediction and Classification System (RIVPACS; O/E-RF), (2) Benthic Index of Biotic Integrity (B-IBI), and (3) Average Score Per Taxon (ASPT). O/E-SA showed significant positive linear relationships with O/E-RF, B-IBI and ASPT. Quantile regressions showed that O/E-SA and O/E-RF had hump-shape relationships with most eutrophication metrics, whereas B-IBI and ASPT had no obvious relationships. Only O/E-SA, O/E50 and B-IBI significantly discriminated cultivated from urban lakes. O/E-SA had comparable or higher performance with O/E-RF, B-IBI and ASPT, but was much simpler. Therefore, O/E-SA is a simple and reliable index for lake ecosystem health bioassessment. Finally, a framework was proposed for integrated biological assessment of Yangtze-disconnected lakes.
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Affiliation(s)
- Junyan Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yajing He
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yongjing Zhao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Kai Chen
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
| | - Yongde Cui
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Hongzhu Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
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Skwierawski A. Carbon Sequestration Potential in the Restoration of Highly Eutrophic Shallow Lakes. Int J Environ Res Public Health 2022; 19:ijerph19106308. [PMID: 35627846 PMCID: PMC9140842 DOI: 10.3390/ijerph19106308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/20/2022] [Accepted: 05/21/2022] [Indexed: 01/25/2023]
Abstract
The primary goal of the study was to determine the quantity of carbon accumulated in shallow fertile water bodies that were restored after a long period of drainage. Massive drainage of mid-field water bodies took place in north-eastern Poland in the 19th century. Of 143 identified drained lakes (each of more than 1 ha before drying) in the Olsztyn Lakeland, 27 have been restored to their original state through natural rewilding processes or recovery projects. From among the variety of drained water bodies, 8 which have been naturally or artificially restored to their original condition 13 to 47 years ago, were the subject of a detailed study on carbon sequestration. The studied water bodies had high productivity, and they were classified as moderately eutrophic to extremely hypertrophic. An analysis of bottom sediments revealed that, after restoration, the examined water bodies have accumulated 275.5 g C m-2 a-1 on average, which is equivalent to 10.1 Mg ha-1 a-1 of carbon dioxide (CO2) removed from the atmosphere. Results showed that the evaluated water bodies are effective carbon sinks. Most of the lakes drained in the 19th century are wastelands today, and they can be relatively easily restored to their original condition to create additional carbon sequestration sites. Lake restoration seems to be a cost-effective method both for carbon capture (as additional potential capacity as part of carbon dioxide removal (CDR) methods) and to support the sustainable use of agricultural areas. However, this second goal may be limited by the poor ecological status of such facilities.
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Affiliation(s)
- Andrzej Skwierawski
- Department of Water Resources and Climatology, University of Warmia and Mazury in Olsztyn, Plac Łódzki 2, 10-719 Olsztyn, Poland
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Moi DA, Romero GQ, Jeppesen E, Kratina P, Alves DC, Antiqueira PAP, Teixeira de Mello F, Figueiredo BRS, Bonecker CC, Pires APF, Braghin LSM, Mormul RP. Regime shifts in a shallow lake over 12 years: consequences for taxonomic and functional diversity, and ecosystem multifunctionality. J Anim Ecol 2021; 91:551-565. [PMID: 34954827 DOI: 10.1111/1365-2656.13658] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 12/17/2021] [Indexed: 11/26/2022]
Abstract
Under increasing nutrient loading, shallow lakes may shift from a state of clear water dominated by submerged macrophytes to a turbid state dominated by phytoplankton or a shaded state dominated by floating macrophytes. How such regime shifts mediate the relationship between taxonomic and functional diversity and lake multifunctionality is poorly understood. We employed a detailed database describing a shallow lake over a 12-year period during which the lake has displayed all the three states (clear, turbid, and shaded) to investigate how species richness, functional diversity of fish and zooplankton, ecosystem multifunctionality, and five individual ecosystem functions (nitrogen and phosphorus concentrations, standing fish biomass, algae production, and light availability) differ among states. We also evaluated how the relationship between biodiversity (species richness and functional diversity) and multifunctionality is affected by regime shifts. We showed that species richness and the functional diversity of fish and zooplankton were highest during the clear state. The clear state also maintained the highest values of multifunctionality as well as standing fish biomass production, algae biomass, and light availability, whereas the turbid and shaded states had higher nutrient concentrations. Functional diversity was the best predictor of multifunctionality. The relationship between functional diversity and multifunctionality was strongly positive during the clear state, but such relationship became flatter after the shift to the turbid or shaded state. Our findings illustrate that focusing on functional traits may provide a more mechanistic understanding of how regime shifts affect biodiversity and the consequences for ecosystem functioning. Regime shifts towards a turbid or shaded state negatively affect the taxonomic and functional diversity of fish and zooplankton, which in turn impairs the multifunctionality of shallow lakes.
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Affiliation(s)
- Dieison A Moi
- Graduate Program in Ecology of Inland Water Ecosystems (PEA), Department of Biology (DBI), Center of Biological Sciences (CCB), State University of Maringá (UEM), Brazil
| | - Gustavo Q Romero
- Laboratory of Multitrophic Interactions and Biodiversity, Department of Animal Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, 13083-862, Brazil
| | - Erik Jeppesen
- Department of Bioscience, Aarhus University, DK-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
| | - Pavel Kratina
- School of Biological and Behavioral Sciences, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
| | - Diego C Alves
- Graduate Program in Ecology of Inland Water Ecosystems (PEA), Department of Biology (DBI), Center of Biological Sciences (CCB), State University of Maringá (UEM), Brazil.,Departamento de Estatística, Centro de Ciências Exatas, Universidade Estadual de Maringa´, Av. Colombo, 5790, Maringá, Paraná, 87020-900, Brazil
| | - Pablo A P Antiqueira
- Laboratory of Multitrophic Interactions and Biodiversity, Department of Animal Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, 13083-862, Brazil
| | - Franco Teixeira de Mello
- Departamento de Ecología y Gestión Ambiental CURE, Universidad de la República, Tacuarembó s/n, Maldonado, Uruguay
| | - Bruno R S Figueiredo
- Department of Ecology and Zoology, Federal University of Santa Catarina, Florianopolis, SC, Brazil
| | - Claudia C Bonecker
- Graduate Program in Ecology of Inland Water Ecosystems (PEA), Department of Biology (DBI), Center of Biological Sciences (CCB), State University of Maringá (UEM), Brazil
| | - Aliny P F Pires
- Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Louizi S M Braghin
- Graduate Program in Ecology of Inland Water Ecosystems (PEA), Department of Biology (DBI), Center of Biological Sciences (CCB), State University of Maringá (UEM), Brazil
| | - Roger P Mormul
- Graduate Program in Ecology of Inland Water Ecosystems (PEA), Department of Biology (DBI), Center of Biological Sciences (CCB), State University of Maringá (UEM), Brazil
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Chaparro Pedraza PC, Matthews B, de Meester L, Dakos V. Adaptive Evolution Can Both Prevent Ecosystem Collapse and Delay Ecosystem Recovery. Am Nat 2021; 198:E185-E197. [PMID: 34762570 DOI: 10.1086/716929] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractThere is growing concern about the dire socioecological consequences of abrupt transitions between alternative ecosystem states in response to environmental changes. At the same time, environmental change can trigger evolutionary responses that could stabilize or destabilize ecosystem dynamics. However, we know little about how coupled ecological and evolutionary processes affect the risk of transition between alternative ecosystem states. Using shallow lakes as a model ecosystem, we investigate how trait evolution of a key species affects ecosystem resilience under environmental stress. We find that adaptive evolution of macrophytes can increase ecosystem resilience by shifting the critical threshold, which marks the transition from a clear-water state to a turbid-water state to a higher level of environmental stress. However, following the transition, adaptation to the turbid-water state can delay the ecosystem recovery back to the clear-water state. This implies that restoration could be more effective when implemented early enough after a transition occurs and before organisms adapt to the alternative state. Our findings provide new insights into how to prevent and mitigate the occurrence of regime shifts in ecosystems and highlight the need to understand ecosystem responses to environmental change in the context of coupled ecological and evolutionary processes.
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Dörr AJM, Scoparo M, Cardinali I, La Porta G, Caldaroni B, Magara G, Pallottini M, Selvaggi R, Cenci-Goga B, Goretti E, Cappelletti D, Lancioni H, Elia AC. Population Ecology and Genetic Diversity of the Invasive Alien Species Procambarus clarkii in Lake Trasimeno (Italy). Biology (Basel) 2021; 10:biology10101059. [PMID: 34681160 PMCID: PMC8533476 DOI: 10.3390/biology10101059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 10/01/2021] [Accepted: 10/15/2021] [Indexed: 11/25/2022]
Abstract
Simple Summary The population of Procambarus clarkii was surveyed twenty years after its introduction into Lake Trasimeno (Central Italy), investigating both ecological and genetic aspects. Our results confirmed that P. clarkii is well acclimatized with a stable population structure, mainly characterized by a unique mitochondrial lineage, suggesting that a single introduction event may have occurred in the lake, complemented by secondary events. Abstract The deliberate or accidental introduction of invasive alien species (IAS) causes negative ecological and economic impacts altering ecosystem processes, imperiling native species and causing damage to human endeavors. A monthly monitoring program was performed in Lake Trasimeno (Central Italy) from July 2018 to July 2019 in order to provide an upgrade of the population ecology of Procambarus clarkii and to assess the genetic diversity by analyzing the relationships among mitochondrial DNA diversity. Our results confirmed that P. clarkii is well acclimatized in the lake, revealing a stable population structure favored by the resources and conditions typical of this ecosystem, which seem to be optimal for the maintenance of the species. Four distinct mitochondrial haplotypes were detected, but one of them was clearly overrepresented (76%), suggesting that a single predominant introduction event may have occurred in this area, likely followed by secondary events. The identification of the typical genetic variants provides a better understanding of the evolutionary scenarios of P. clarkii in this biotope and it can be helpful in management plans concerning the expanding populations of this invasive alien species.
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Affiliation(s)
- Ambrosius Josef Martin Dörr
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Melissa Scoparo
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Irene Cardinali
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Gianandrea La Porta
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
- Correspondence:
| | - Barbara Caldaroni
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Gabriele Magara
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Matteo Pallottini
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Roberta Selvaggi
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Beniamino Cenci-Goga
- Department of Veterinary Medicine, University of Perugia, Via San Costanzo 4, 06126 Perugia, Italy;
| | - Enzo Goretti
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - David Cappelletti
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Hovirag Lancioni
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
| | - Antonia Concetta Elia
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy; (A.J.M.D.); (M.S.); (I.C.); (B.C.); (G.M.); (M.P.); (R.S.); (E.G.); (D.C.); (H.L.); (A.C.E.)
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10
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Yuan LL. Continental-scale effects of phytoplankton and non-phytoplankton turbidity on macrophyte occurrence in shallow lakes. Aquat Sci 2021; 14:10.1007/s00027-020-00769-1. [PMID: 34366634 PMCID: PMC8340603 DOI: 10.1007/s00027-020-00769-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/18/2020] [Indexed: 06/13/2023]
Abstract
Submerged macrophytes are key components of shallow lake biological communities, and their presence has been associated with a predominantly clear-water state. Conversely, lakes lacking macrophytes are often turbid with elevated phytoplankton abundance. One main mechanism that influences the presence or absence of submerged macrophytes is turbidity that reduces the light available to macrophytes. Increases in turbidity can be caused by increased phytoplankton abundance and by increased concentrations of suspended inorganic sediment and understanding the relative contributions of these two factors can inform efforts to manage the effects of increased turbidity on macrophyte occurrence. Here, a continental scale data set is analyzed to quantify the effects of macrophytes on turbidity that originates from phytoplankton and from non-phytoplankton sources (e.g., inorganic sediment). Effects of phytoplankton assemblage composition on turbidity are also estimated. Based on this model, illustrative examples of chlorophyll concentrations needed to maintain or restore macrophytes to shallow lakes are calculated, and the difference in the magnitude of these concentrations illustrates the stabilizing effect of macrophytes on lake condition.
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Affiliation(s)
- Lester L Yuan
- Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave, NW (MC 4304T), Washington, DC 20460
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11
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Ersoy Z, Scharfenberger U, Baho DL, Bucak T, Feldmann T, Hejzlar J, Levi EE, Mahdy A, Nõges T, Papastergiadou E, Stefanidis K, Šorf M, Søndergaard M, Trigal C, Jeppesen E, Beklioğlu M. Impact of nutrients and water level changes on submerged macrophytes along a temperature gradient: A pan-European mesocosm experiment. Glob Chang Biol 2020; 26:6831-6851. [PMID: 32893967 DOI: 10.1111/gcb.15338] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 08/06/2020] [Accepted: 08/16/2020] [Indexed: 06/11/2023]
Abstract
Submerged macrophytes are of key importance for the structure and functioning of shallow lakes and can be decisive for maintaining them in a clear water state. The ongoing climate change affects the macrophytes through changes in temperature and precipitation, causing variations in nutrient load, water level and light availability. To investigate how these factors jointly determine macrophyte dominance and growth, we conducted a highly standardized pan-European experiment involving the installation of mesocosms in lakes. The experimental design consisted of mesotrophic and eutrophic nutrient conditions at 1 m (shallow) and 2 m (deep) depth along a latitudinal temperature gradient with average water temperatures ranging from 14.9 to 23.9°C (Sweden to Greece) and a natural drop in water levels in the warmest countries (Greece and Turkey). We determined percent plant volume inhabited (PVI) of submerged macrophytes on a monthly basis for 5 months and dry weight at the end of the experiment. Over the temperature gradient, PVI was highest in the shallow mesotrophic mesocosms followed by intermediate levels in the shallow eutrophic and deep mesotrophic mesocosms, and lowest levels in the deep eutrophic mesocosms. We identified three pathways along which water temperature likely affected PVI, exhibiting (a) a direct positive effect if light was not limiting; (b) an indirect positive effect due to an evaporation-driven water level reduction, causing a nonlinear increase in mean available light; and (c) an indirect negative effect through algal growth and, thus, high light attenuation under eutrophic conditions. We conclude that high temperatures combined with a temperature-mediated water level decrease can counterbalance the negative effects of eutrophic conditions on macrophytes by enhancing the light availability. While a water level reduction can promote macrophyte dominance, an extreme reduction will likely decrease macrophyte biomass and, consequently, their capacity to function as a carbon store and food source.
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Affiliation(s)
- Zeynep Ersoy
- Limnology Laboratory, Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
- 'Rui Nabeiro' Biodiversity Chair, MED - Mediterranean Institute for Agriculture, Environment and Development, Universidade de Évora, Évora, Portugal
| | - Ulrike Scharfenberger
- Department of River Ecology, Helmholtz Centre for Environmental Research UFZ, Magdeburg, Germany
- Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
| | - Didier L Baho
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Tuba Bucak
- Limnology Laboratory, Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
- Nature Conservation Centre, Ankara, Turkey
| | - Tõnu Feldmann
- Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartumaa, Estonia
| | - Josef Hejzlar
- Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, České Budějovice, Czech Republic
| | - Eti E Levi
- Limnology Laboratory, Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
- Department of Bioscience, Aarhus University, Silkeborg, Denmark
| | - Aldoushy Mahdy
- Department of Zoology, Faculty of Science, Al-Azhar University (Assiut Branch), Assiut, Egypt
| | - Tiina Nõges
- Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartumaa, Estonia
| | | | - Konstantinos Stefanidis
- Department of Biology, University of Patras, Rio, Greece
- Institute of Marine Biological Resources and Inland Waters, Hellenic Centre for Marine Research, Anavissos Attiki, Greece
| | - Michal Šorf
- Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, České Budějovice, Czech Republic
- Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic
| | - Martin Søndergaard
- Department of Bioscience, Aarhus University, Silkeborg, Denmark
- Sino-Danish Centre for Education and Research, University of Chinese Academy of Sciences, Beijing, China
| | - Cristina Trigal
- Species Information Center, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Erik Jeppesen
- Limnology Laboratory, Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
- Department of Bioscience, Aarhus University, Silkeborg, Denmark
- Sino-Danish Centre for Education and Research, University of Chinese Academy of Sciences, Beijing, China
- Centre for Ecosystem Research and Implementation (EKOSAM), Middle East Technical University, Ankara, Turkey
| | - Meryem Beklioğlu
- Limnology Laboratory, Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
- Centre for Ecosystem Research and Implementation (EKOSAM), Middle East Technical University, Ankara, Turkey
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12
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Schiaffino MR, Huber P, Sagua M, Sabio Y García CA, Reissig M. Covariation patterns of phytoplankton and bacterioplankton in hypertrophic shallow lakes. FEMS Microbiol Ecol 2020; 96:5894912. [PMID: 32816009 DOI: 10.1093/femsec/fiaa161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 08/12/2020] [Indexed: 11/14/2022] Open
Abstract
The aim of this work was to assess the temporal patterns in the community composition of phytoplankton (PCC) and bacterioplankton (BCC) in two interconnected and hypertrophic Pampean shallow lakes in Argentina. Factors shaping their community dynamics and community temporal covariations were also analysed. We performed 4 years of seasonal samplings (2012-2016) and communities were studied by the Utermöhl approach (PCC) and Illumina MiSeq sequencing (BCC). We found marked seasonal variations in both communities and inter-annual variations with decreasing microbial community similarities during the study. We also observed covariation in community-level dynamics among PCC and BCC within and between shallow lakes. The within-lake covariations remained positive and significant, while controlling for the effects of intrinsic (environmental) and extrinsic (temporal and meteorological) factors, suggesting a community coupling mediated by intrinsic biotic interactions. Algal-bacterial associations between different taxa of phytoplankton and bacterioplankton within each lake were also found. PCC was mainly explained by pure regional extrinsic (17-21%) and intrinsic environmental (8-9%) factors, while BCC was explained by environmental (8-10%) and biotic interactions with phytoplankton (7-8%). Our results reveal that the influence of extrinsic regional factors can be channeled to bacterioplankton through both environmental (i.e. water temperature) and phytoplankton effects.
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Affiliation(s)
- M R Schiaffino
- Departamento de Ciencias Básicas y Experimentales, Universidad Nacional del Noroeste de la Provincia de Buenos Aires, Roque Sáenz Peña 456, 6000, Junín, Argentina.,Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires (CITNOBA) - UNNOBA-UNSAdA-CONICET, Jorge Newbery 355, 6000, Junín, Argentina
| | - P Huber
- Instituto Nacional de Limnología (INALI, CONICET-UNL), Colectora Ruta Nac. 168, Paraje El Pozo, 3000, Santa Fe, Argentina
| | - M Sagua
- Departamento de Ciencias Básicas y Experimentales, Universidad Nacional del Noroeste de la Provincia de Buenos Aires, Roque Sáenz Peña 456, 6000, Junín, Argentina.,Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires (CITNOBA) - UNNOBA-UNSAdA-CONICET, Jorge Newbery 355, 6000, Junín, Argentina
| | - C A Sabio Y García
- CONICET - Universidad de Buenos Aires, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Intendente Güiraldes 2160, Ciudad Universitaria - C1428EGA, Buenos Aires, Argentina.,Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Depto. Ecología, Genética y Evolución, Intendente Güiraldes 2160, Ciudad Universitaria - C1428EGA, Buenos Aires, Argentina
| | - M Reissig
- Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), Universidad Nacional del Comahue - CONICET, Quintral 1250, 8400, San Carlos de Bariloche, Argentina
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13
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Zhang CX, Xu M, Dong YF, Wang R, Fang FM. [Sedimentary Diatom Records Reveal the Succession of Ecosystem in Lake Xihu, Dali over the Past 50 Years]. Huan Jing Ke Xue 2020; 41:4572-4580. [PMID: 33124389 DOI: 10.13227/j.hjkx.202003293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In recent decades, intense human activities have caused a decline in many lake ecosystems in Yunnan Province, rendering the transformation of the lake from a clear macrophyte-dominated state to a turbid phytoplankton-dominated state. Improved understanding of the ecological changes in lake ecosystem has significant implications for management. In this study, a small lake in Dali Prefecture of Yunnan Province, i.e., Lake Xihu, was selected. Combined with diatom records and physicochemical proxies from the lake sediments, this paper focuses on the long-term ecological changes in Lake Xihu, Dali since the mid-1960s. The results show that the Lake Xihu, Dali has undergone a significant shift in stable states over the past 50 years. Prior to 2000, the benthic-epiphytic species (i.e., Cocconeis placentula, Staurosira construens, Gomphonema angustum, and Achnanthidium minutissimum) dominated in diatom assemblages, indicating oligotrophic conditions; since 2000, benthic-epiphytic species (i.e., Encyonopsis microcephala and Navicula cryptocephala) and planktonic species (i.e., Cyclotella atomus, Cyclotella meneghiniana, Stephanodiscus hantzschii, and Aulacoseira granulata) dominated successively, indicating mesotrophic to eutrophic conditions. Principal component analysis based on the diatom assemblages in temporal scale showed the response of diatoms succession to nutrients. Redundancy analysis also confirmed that nutrient enrichment was the main driving force for the succession of diatom assemblages in Lake Xihu, Dali. In the past 50 years, climate change and human activities (i.e., agricultural reclamation, fertilization, animal husbandry, and fishery) have enhanced the accumulation of nutrients in the lake. The continuous loading of nutrients promoted the propagation of planktonic algae, and also the productivity of the lake, rendering the transformation to a turbid phytoplankton-dominated state.
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Affiliation(s)
- Chen-Xue Zhang
- School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Min Xu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yi-Fan Dong
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Rong Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Feng-Man Fang
- School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China
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14
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Andersen TK, Nielsen A, Jeppesen E, Hu F, Bolding K, Liu Z, Søndergaard M, Johansson LS, Trolle D. Predicting ecosystem state changes in shallow lakes using an aquatic ecosystem model: Lake Hinge, Denmark, an example. Ecol Appl 2020; 30:e02160. [PMID: 32363772 PMCID: PMC7583379 DOI: 10.1002/eap.2160] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 12/26/2019] [Accepted: 03/30/2020] [Indexed: 05/06/2023]
Abstract
In recent years, considerable efforts have been made to restore turbid, phytoplankton-dominated shallow lakes to a clear-water state with high coverage of submerged macrophytes. Various dynamic lake models with simplified physical representations of vertical gradients, such as PCLake, have been used to predict external nutrient load thresholds for such nonlinear regime shifts. However, recent observational studies have questioned the concept of regime shifts by emphasizing that gradual changes are more common than sudden shifts. We investigated if regime shifts would be more gradual if the models account for depth-dependent heterogeneity of the system by including the possibility of vertical gradients in the water column and sediment layers for the entire depth. Hence, bifurcation analysis was undertaken using the 1D hydrodynamic model GOTM, accounting for vertical gradients, coupled to the aquatic ecosystem model PCLake, which is implemented in the framework for aquatic biogeochemical modeling (FABM). First, the model was calibrated and validated against a comprehensive data set covering two consecutive 7-yr periods from Lake Hinge, a shallow, eutrophic Danish lake. The autocalibration program Auto-Calibration Python (ACPy) was applied to achieve a more comprehensive adjustment of model parameters. The model simulations showed excellent agreement with observed data for water temperature, total nitrogen, and nitrate and good agreement for ammonium, total phosphorus, phosphate, and chlorophyll a concentrations. Zooplankton and macrophyte coverage were adequately simulated for the purpose of this study, and in general the GOTM-FABM-PCLake model simulations performed well compared with other model studies. In contrast to previous model studies ignoring depth heterogeneity, our bifurcation analysis revealed that the spatial extent and depth limitation of macrophytes as well as phytoplankton chlorophyll-a responded more gradually over time to a reduction in the external phosphorus load, albeit some hysteresis effects still appeared. In a management perspective, our study emphasizes the need to include depth heterogeneity in the model structure to more correctly determine at which external nutrient load a given lake changes ecosystem state to a clear-water condition.
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Affiliation(s)
- Tobias Kuhlmann Andersen
- Department of BioscienceAarhus University8600SilkeborgDenmark
- Sino‐Danish Center for Education and ResearchUniversity of Chinese Academy of SciencesBeijing100049China
| | - Anders Nielsen
- Department of BioscienceAarhus University8600SilkeborgDenmark
| | - Erik Jeppesen
- Department of BioscienceAarhus University8600SilkeborgDenmark
- Sino‐Danish Center for Education and ResearchUniversity of Chinese Academy of SciencesBeijing100049China
| | - Fenjuan Hu
- Department of BioscienceAarhus University8600SilkeborgDenmark
| | - Karsten Bolding
- Department of BioscienceAarhus University8600SilkeborgDenmark
- Sino‐Danish Center for Education and ResearchUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhengwen Liu
- Sino‐Danish Center for Education and ResearchUniversity of Chinese Academy of SciencesBeijing100049China
- State Key Laboratory of Lake Science and EnvironmentNanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing210008China
- Department of EcologyJinan UniversityGuangzhou510632China
| | - Martin Søndergaard
- Department of BioscienceAarhus University8600SilkeborgDenmark
- Sino‐Danish Center for Education and ResearchUniversity of Chinese Academy of SciencesBeijing100049China
| | | | - Dennis Trolle
- Department of BioscienceAarhus University8600SilkeborgDenmark
- Sino‐Danish Center for Education and ResearchUniversity of Chinese Academy of SciencesBeijing100049China
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15
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Wu P, Lu Y, Lu Y, Dai J, Huang T. Response of the photosynthetic activity and biomass of the phytoplankton community to increasing nutrients during cyanobacterial blooms in Meiliang Bay, Lake Taihu. Water Environ Res 2020; 92:138-148. [PMID: 31486194 DOI: 10.1002/wer.1220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 06/06/2019] [Accepted: 08/16/2019] [Indexed: 06/10/2023]
Abstract
Nutrient enrichment facilitates algal outbreaks in eutrophic shallow lakes. To further understand the influence of various inorganic nutrient forms on cyanobacterial blooms, a nitrate (NO3 ), ammonium (NH4 ), and orthophosphate (PO4 ) amendment experiment was conducted in a large shallow lake of China (Lake Taihu) during summer. The results showed that the photosynthetic performance of phytoplankton responded more positively to phosphorus (P) than nitrogen (N), and NH4 addition stimulated higher algal photosynthetic activities in P-enriched waters. Individual inorganic N or PO4 addition significantly activated cyanobacteria and green algae. Meanwhile, the N plus P amendment promoted higher biomass of the planktonic microbial community, and the dual addition of NH4 + PO4 yielded the highest chlorophyll a concentration. NH4 additions provisionally promoted higher green algae than cyanobacteria biomass in the beginning, while cyanobacteria dominated again with increasing NH4 :PO4 ratios. These results revealed that increasing ammonium would enhance the increase in phytoplankton biomass in advance and prolong the duration of algal blooms. Hence, based on the control of P loading, the reduction in external inorganic N focusing on ammonium sources (such as ammonia N fertilizer) at the watershed scale would help to alleviate eutrophication and cyanobacterial blooms over the long term in Lake Taihu. PRACTITIONER POINTS: Ammonium addition stimulated higher algal photosynthetic activities in P-enriched waters. Individual inorganic N or PO4 addition significantly activated cyanobacteria and green algae. The dual addition of NH4 + PO4 yielded the highest chlorophyll a concentration. Increasing NH4 would enhance the increase in phytoplankton biomass in advance and prolong the duration of cyanobacterial blooms.
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Affiliation(s)
- Pan Wu
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, China
| | - Yongjun Lu
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, China
| | - Yan Lu
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, China
| | - Jiangyu Dai
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, China
| | - Tingjie Huang
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, China
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16
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Abstract
Natural and human disturbances have caused widespread regime shifts in shallow lakes of the lower Yangtze basin (LYB, China) resulting in a severe decline of ecosystem services. Improved understanding of the relationship between environmental forcing and ecosystem response, and the mechanisms behind regime shifts has significant implications for management. However, the patterns of these regime shifts and the underlying internal mechanisms are less known. In this study, two typical lakes (Chaohu and Zhangdu) from the LYB were selected to determine the trajectories of ecological regime shifts, both of which transitioned from vegetation- to plankton-dominated states several decades ago. Ecological trajectories since the 1900s in both lakes were reconstructed using palaeolimnological proxies, mainly diatom assemblages. Although results show that regime shifts occurred in both lakes in the 1970s and the 1950s, respectively, their inherent mechanisms were different. In Lake Zhangdu, altered hydrological conditions pushed the ecosystem across an ecological threshold, providing an example of a driver-mediated regime shift. In Lake Chaohu, ongoing nutrient loading influenced ecosystem processes and drove the lake to an alternative stable state, potentially presenting an example of a critical transition after a loss of resilience. This research indicates that palaeolimnological perspectives can provide insights into regime shift changes, as well as important information regarding which restoration methods should be tailored to individual lakes.
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Affiliation(s)
- Min Xu
- School of Geography Science, Nanjing Normal University, Nanjing 210023, People's Republic of China
| | - Rong Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
| | - Xuhui Dong
- Department of Geography, Guangzhou University, Guangzhou 510030, People's Republic of China
| | - Xiangdong Yang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
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17
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Diovisalvi N, Odriozola M, Garcia de Souza J, Rojas Molina F, Fontanarrosa MS, Escaray R, Bustingorry J, Sanzano P, Grosman F, Zagarese H. Species-specific phenological trends in shallow Pampean lakes' (Argentina) zooplankton driven by contemporary climate change in the Southern Hemisphere. Glob Chang Biol 2018; 24:5137-5148. [PMID: 30112780 DOI: 10.1111/gcb.14423] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 06/01/2018] [Accepted: 06/23/2018] [Indexed: 06/08/2023]
Abstract
The relationship between the timing of recurrent biological events and seasonal climatic patterns (i.e., phenology) is a crucial ecological process. Changes in phenology are increasingly linked to global climate change. However, current evidence of phenological responses to recent climate change is subjected to substantial regional and seasonal biases. Most available evidence on climate-driven phenological changes comes from Northern Hemisphere (NH) ecosystems and typically involves increases in spring and summer temperatures, which translate into earlier onsets of spring population developments. In the Argentine Pampa region, warming has occurred at a much slower pace than in the NH, and trends are mostly restricted to increases in the minimum temperatures. We used zooplankton abundance data from Lake Chascomús (recorded every two weeks from 2005 to 2015) to evaluate potential changes in phenology. We adopted a sequential screening approach to identify taxa displaying phenological trends and evaluated whether such trends could be associated to observe long-term changes in water temperature. Two zooplankton species displayed significant later shifts in phenology metrics (end date of Brachionus havanaensis seasonal distribution: 31 day/decade, onset and end dates of Keratella americana seasonal distribution: 59 day/decade and 82 day/decade, respectively). The timing of the observed shift in B. havanaensis phenology was coincident with a warming trend in the May lake water temperature (4.7°C per decade). Analysis of abundance versus temperature patterns from six additional shallow Pampean lakes, and evaluation of previous experimental results, provided further evidence that the lake water warming trend in May was responsible for the delayed decline of B. havanaensis populations in autumn. This study is the first report of freshwater zooplankton phenology changes in the Southern Hemisphere (SH).
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Affiliation(s)
- Nadia Diovisalvi
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (IIB-INTECH) (CONICET-UNSAM), Chascomús, Argentina
| | - Mariana Odriozola
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (IIB-INTECH) (CONICET-UNSAM), Chascomús, Argentina
| | - Javier Garcia de Souza
- Laboratorio de Ecología de Peces, Instituto de Limnología "Dr. Raul A. Ringuelet" (ILPLA) (CONICET-UNLP), La Plata, Argentina
| | | | - María S Fontanarrosa
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNC), Tandil, Argentina
| | - Roberto Escaray
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (IIB-INTECH) (CONICET-UNSAM), Chascomús, Argentina
| | - José Bustingorry
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (IIB-INTECH) (CONICET-UNSAM), Chascomús, Argentina
| | - Pablo Sanzano
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNC), Tandil, Argentina
| | - Fabián Grosman
- Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNC), Tandil, Argentina
| | - Horacio Zagarese
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (IIB-INTECH) (CONICET-UNSAM), Chascomús, Argentina
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18
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Savadova K, Mazur-Marzec H, Karosienė J, Kasperovičienė J, Vitonytė I, Toruńska-Sitarz A, Koreivienė J. Effect of Increased Temperature on Native and Alien Nuisance Cyanobacteria from Temperate Lakes: An Experimental Approach. Toxins (Basel) 2018; 10:E445. [PMID: 30380769 PMCID: PMC6265895 DOI: 10.3390/toxins10110445] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/27/2018] [Accepted: 10/28/2018] [Indexed: 11/17/2022] Open
Abstract
In response to global warming, an increase in cyanobacterial blooms is expected. In this work, the response of two native species of Planktothrix agardhii and Aphanizomenon gracile, as well as the response of two species alien to Europe-Chrysosporum bergii and Sphaerospermopsis aphanizomenoides-to gradual temperature increase was tested. The northernmost point of alien species distribution in the European continent was recorded. The tested strains of native species were favoured at 20⁻28 °C. Alien species acted differently along temperature gradient and their growth rate was higher than native species. Temperature range of optimal growth rate for S. aphanizomenoides was similar to native species, while C. bergii was favoured at 26⁻30 °C but sensitive at 18⁻20 °C. Under all tested temperatures, non-toxic strains of the native cyanobacteria species prevailed over the toxic ones. In P. agardhii, the decrease in concentration of microcystins and other oligopeptides with the increasing temperature was related to higher growth rate. However, changes in saxitoxin concentration in A. gracile under different temperatures were not detected. Accommodating climate change perspectives, the current work showed a high necessity of further studies of temperature effect on distribution and toxicity of both native and alien cyanobacterial species.
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Affiliation(s)
- Ksenija Savadova
- Institute of Botany, Nature Research Centre, LT-08412 Vilnius, Lithuania.
| | - Hanna Mazur-Marzec
- Division of Marine Biotechnology, Faculty of Oceanography and Geography, University of Gdańsk, Marszałka J. Piłsudskiego 46, PL-81-378 Gdynia, Poland.
| | - Jūratė Karosienė
- Institute of Botany, Nature Research Centre, LT-08412 Vilnius, Lithuania.
| | | | - Irma Vitonytė
- Institute of Botany, Nature Research Centre, LT-08412 Vilnius, Lithuania.
| | - Anna Toruńska-Sitarz
- Division of Marine Biotechnology, Faculty of Oceanography and Geography, University of Gdańsk, Marszałka J. Piłsudskiego 46, PL-81-378 Gdynia, Poland.
| | - Judita Koreivienė
- Institute of Botany, Nature Research Centre, LT-08412 Vilnius, Lithuania.
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19
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Alp M, Cucherousset J, Buoro M, Lecerf A. Phenological response of a key ecosystem function to biological invasion. Ecol Lett 2016; 19:519-27. [PMID: 26931804 DOI: 10.1111/ele.12585] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 11/24/2015] [Accepted: 01/20/2016] [Indexed: 01/03/2023]
Abstract
Although climate warming has been widely demonstrated to induce shifts in the timing of many biological events, the phenological consequences of other prominent global change drivers remain largely unknown. Here, we investigated the effects of biological invasions on the seasonality of leaf litter decomposition, a crucial freshwater ecosystem function. Decomposition rates were quantified in 18 temperate shallow lakes distributed along a gradient of crayfish invasion and a temperature-based model was constructed to predict yearly patterns of decomposition. We found that, through direct detritus consumption, omnivorous invasive crayfish accelerated decomposition rates up to fivefold in spring, enhancing temperature dependence of the process and shortening the period of major detritus availability in the ecosystem by up to 39 days (95% CI: 15-61). The fact that our estimates are an order of magnitude higher than any previously reported climate-driven phenological shifts indicates that some powerful drivers of phenological change have been largely overlooked.
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Affiliation(s)
- Maria Alp
- UMR5174 EDB (Laboratoire Évolution & Diversité Biologique), CNRS, Université Paul Sabatier, ENFA, 118 route de Narbonne, F-31062 Toulouse, France
| | - Julien Cucherousset
- UMR5174 EDB (Laboratoire Évolution & Diversité Biologique), CNRS, Université Paul Sabatier, ENFA, 118 route de Narbonne, F-31062 Toulouse, France
| | - Mathieu Buoro
- UMR5174 EDB (Laboratoire Évolution & Diversité Biologique), CNRS, Université Paul Sabatier, ENFA, 118 route de Narbonne, F-31062 Toulouse, France
| | - Antoine Lecerf
- UMR 5245 EcoLab (Laboratoire d'Écologie Fonctionnelle et Environnement);, CNRS Université Paul Sabatier, 118 route de Narbonne, F-31062, Toulouse, France
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20
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Jo H, Ventura M, Vidal N, Gim JS, Buchaca T, Barmuta LA, Jeppesen E, Joo GJ. Discovering hidden biodiversity: the use of complementary monitoring of fish diet based on DNA barcoding in freshwater ecosystems. Ecol Evol 2015; 6:219-32. [PMID: 26811787 PMCID: PMC4716507 DOI: 10.1002/ece3.1825] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 10/05/2015] [Accepted: 10/05/2015] [Indexed: 11/11/2022] Open
Abstract
Ecological monitoring contributes to the understanding of complex ecosystem functions. The diets of fish reflect the surrounding environment and habitats and may, therefore, act as useful integrating indicators of environmental status. It is, however, often difficult to visually identify items in gut contents to species level due to digestion of soft‐bodied prey beyond visual recognition, but new tools rendering this possible are now becoming available. We used a molecular approach to determine the species identities of consumed diet items of an introduced generalist feeder, brown trout (Salmo trutta), in 10 Tasmanian lakes and compared the results with those obtained from visual quantification of stomach contents. We obtained 44 unique taxa (OTUs) belonging to five phyla, including seven classes, using the barcode of life approach from cytochrome oxidase I (COI). Compared with visual quantification, DNA analysis showed greater accuracy, yielding a 1.4‐fold higher number of OTUs. Rarefaction curve analysis showed saturation of visually inspected taxa, while the curves from the DNA barcode did not saturate. The OTUs with the highest proportions of haplotypes were the families of terrestrial insects Formicidae, Chrysomelidae, and Torbidae and the freshwater Chironomidae. Haplotype occurrence per lake was negatively correlated with lake depth and transparency. Nearly all haplotypes were only found in one fish gut from a single lake. Our results indicate that DNA barcoding of fish diets is a useful and complementary method for discovering hidden biodiversity.
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Affiliation(s)
- Hyunbin Jo
- Department of Integrated Biological Science Pusan National University Busan 46241 South Korea
| | - Marc Ventura
- Centre for Advanced Studies of Blanes Spanish National Research Council (CEAB-CSIC) 17300 Blanes Catalonia Spain
| | - Nicolas Vidal
- Department of Bioscience Aarhus University Vejlsøvej 258600 Silkeborg Denmark; Sino-Danish Centre for Education and Research (SDC) Beijing China
| | - Jeong-Soo Gim
- Department of Integrated Biological Science Pusan National University Busan 46241 South Korea
| | - Teresa Buchaca
- Centre for Advanced Studies of Blanes Spanish National Research Council (CEAB-CSIC) 17300 Blanes Catalonia Spain
| | - Leon A Barmuta
- School of Zoology University of Tasmania Private Bag 5, Hobart, Tasmania 7000 Australia
| | - Erik Jeppesen
- Department of Bioscience Aarhus University Vejlsøvej 258600 Silkeborg Denmark; Sino-Danish Centre for Education and Research (SDC) Beijing China
| | - Gea-Jae Joo
- Department of Integrated Biological Science Pusan National University Busan 46241 South Korea
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21
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Jacob DL, Yellick AH, Kissoon LTT, Asgary A, Wijeyaratne DN, Saini-Eidukat B, Otte ML. Cadmium and associated metals in soils and sediments of wetlands across the Northern Plains, USA. Environ Pollut 2013; 178:211-9. [PMID: 23583941 PMCID: PMC5785079 DOI: 10.1016/j.envpol.2013.03.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 02/14/2013] [Accepted: 03/01/2013] [Indexed: 05/07/2023]
Abstract
Cadmium, present locally in naturally high concentrations in the Northern Plains of the United States, is of concern because of its toxicity, carcinogenic properties, and potential for trophic transfer. Reports of natural concentrations in soils are dominated by dryland soils with agricultural land uses, but much less is known about cadmium in wetlands. Four wetland categories - prairie potholes, shallow lakes, riparian wetlands, and river sediments - were sampled comprising more than 300 wetlands across four states, the majority in North Dakota. Cd, Zn, P, and other elements were analyzed by ICP-MS, in addition to pH and organic matter (as loss-on-ignition). The overall cadmium content was similar to the general concentrations in the area's soils, but distinct patterns occurred within categories. Cd in wetland soils is associated with underlying geology and hydrology, but also strongly with concentrations of P and Zn, suggesting a link with agricultural land use surrounding the wetlands.
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Affiliation(s)
- Donna L Jacob
- Wet Ecosystem Research Group, Department of Biological Sciences, NDSU Department 2715, P.O. Box 6050, Fargo, ND 58108-6050, USA.
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22
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Abstract
Detecting allelopathic inhibition of phytoplankton by submerged macrophytes in an ecologically meaningful way is not easy. Multiple-approach investigations from a laboratory scale to the ecosystem level have been recommended to overcome the shortcomings of individual methods. Whether results of different methods are qualitatively or quantitatively comparable has not yet been tested. Here, we compare the sensitivity of the green algae Desmodesmus subspicatus (Chodat) E. Hegewald et Ant. Schmidt and Stigeoclonium helveticum Vischer to the allelopathic effect of the submerged macrophyte Myriophyllum verticillatum L. The following three approaches were used: (i) coincubation of algae in dialysis membrane tubes in a lake inside and outside a M. verticillatum stand, (ii) coincubation of algae in dialysis membrane tubes in aquaria with and without M. verticillatum, and (iii) single additions of tannic acid (TA), an allelopathically active polyphenol present in this macrophyte, to the algae cultures. For each method, fluorescence-based (chl a, PSII activity) and particle-based (cell count, biovolume) parameters were compared after 48 h of incubation. Results revealed quantitative and qualitative differences between methods. Algae incubated in dialysis membrane tubes in aquaria showed a strong decrease in all parameters under the influence of macrophytes. In situ measurements were influenced by adverse growth conditions for the test algae and only detected significant reductions for biovolume. Single additions of TA induced a strong reduction of fluorescence-based parameters similar to aquarium results, but an increase in the cell count. Even the qualitative transfer of laboratory results to field conditions thus requires caution and a proper selection of parameters.
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Affiliation(s)
- Sabine Hilt Nee Körner
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, Germany
| | - Eike Beutler
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, Germany
| | - Nadine Bauer
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, Germany
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23
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Abstract
Submerged macrophytes are a central component of lake ecosystems; however, little is known regarding their long-term response to environmental change. We have examined the potential of diatoms as indicators of past macrophyte biomass. We first sampled periphyton to determine whether habitat was a predictor of diatom assemblage. We then sampled 41 lakes in Quebec, Canada, to evaluate whether whole-lake submerged macrophyte biomass (BiomEpiV) influenced surface sediment diatom assemblages. A multivariate regression tree (MRT) was used to construct a semiquantitative model to reconstruct past macrophyte biomass. We determined that periphytic diatom assemblages on macrophytes were significantly different from those on wood and rocks (ANOSIM R = 0.63, P < 0.01). A redundancy analysis (RDA) of the 41-lake data set identified BiomEpiV as a significant (P < 0.05) variable in structuring sedimentary diatom assemblages. The MRT analysis classified the lakes into three groups. These groups were (A) high-macrophyte, nutrient-limited lakes (BiomEpiV ≥525 μg · L(-1) ; total phosphorus [TP] <35 μg · L(-1) ; 23 lakes); (B) low-macrophyte, nutrient-limited lakes (BiomEpiV <525 μg · L(-1) ; TP <35 μg · L(-1) ; 12 lakes); and (C) eutrophic lakes (TP ≥35 μg · L(-1) ; six lakes). A semiquantitative model correctly predicted the MRT group of the lake 71% of the time (P < 0.001). These results suggest that submerged macrophytes have a significant influence on diatom community structure and that sedimentary diatom assemblages can be used to infer past macrophyte abundance.
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Affiliation(s)
- Jesse C Vermaire
- Department of Biology, McGill University, Montreal, Quebec, Canada, H3A 1B1Département des Sciences Biologiques, Université du Québec à Montréal, Montréal Québec, Canada H3C 3P8Department of Biology, McGill University, Montreal, Quebec, Canada, H3A 1B1
| | - Yves T Prairie
- Department of Biology, McGill University, Montreal, Quebec, Canada, H3A 1B1Département des Sciences Biologiques, Université du Québec à Montréal, Montréal Québec, Canada H3C 3P8Department of Biology, McGill University, Montreal, Quebec, Canada, H3A 1B1
| | - Irene Gregory-Eaves
- Department of Biology, McGill University, Montreal, Quebec, Canada, H3A 1B1Département des Sciences Biologiques, Université du Québec à Montréal, Montréal Québec, Canada H3C 3P8Department of Biology, McGill University, Montreal, Quebec, Canada, H3A 1B1
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24
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Havens KE, Harwell MC, Brady MA, Sharfstein B, East TL, Rodusky AJ, Anson D, Maki RP. Large-scale mapping and predictive modeling of submerged aquatic vegetation in a shallow eutrophic lake. ScientificWorldJournal 2002; 2:949-65. [PMID: 12805949 PMCID: PMC6009720 DOI: 10.1100/tsw.2002.194] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A spatially intensive sampling program was developed for mapping the submerged aquatic vegetation (SAV) over an area of approximately 20,000 ha in a large, shallow lake in Florida, U.S. The sampling program integrates Geographic Information System (GIS) technology with traditional field sampling of SAV and has the capability of producing robust vegetation maps under a wide range of conditions, including high turbidity, variable depth (0 to 2 m), and variable sediment types. Based on sampling carried out in August-September 2000, we measured 1,050 to 4,300 ha of vascular SAV species and approximately 14,000 ha of the macroalga Chara spp. The results were similar to those reported in the early 1990s, when the last large-scale SAV sampling occurred. Occurrence of Chara was strongly associated with peat sediments, and maximal depths of occurrence varied between sediment types (mud, sand, rock, and peat). A simple model of Chara occurrence, based only on water depth, had an accuracy of 55%. It predicted occurrence of Chara over large areas where the plant actually was not found. A model based on sediment type and depth had an accuracy of 75% and produced a spatial map very similar to that based on observations. While this approach needs to be validated with independent data in order to test its general utility, we believe it may have application elsewhere. The simple modeling approach could serve as a coarse-scale tool for evaluating effects of water level management on Chara populations.
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Affiliation(s)
- Karl E Havens
- South Florida Water Management District, West Palm Beach, FL 33406, USA.
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25
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Abstract
Shallow lakes respond in different ways to changes in nutrient loading (nitrogen, phosphorus). These lakes may be in two different states: turbid, dominated by phytoplankton, and clear, dominated by submerged macrophytes. Both states are self-stabilizing; a shift from turbid to clear occurs at much lower nutrient loading than a shift in the opposite direction. These critical loading levels vary among lakes and are dependent on morphological, biological, and lake management factors. This paper focuses on the role of wetland zones. Several processes are important: transport and settling of suspended solids, denitrification, nutrient uptake by marsh vegetation (increasing nutrient retention), and improvement of habitat conditions for predatory fish. A conceptual model of a lake with surrounding reed marsh was made, including these relations. The lake-part of this model consists of an existing lake model named PCLake. The relative area of lake and marsh can be varied. Model calculations revealed that nutrient concentrations are lowered by the presence of a marsh area, and that the critical loading level for a shift to clear water is increased. This happens only if the mixing rate of the lake and marsh water is adequate. In general, the relative marsh area should be quite large in order to have a substantial effect. Export of nutrients can be enhanced by harvesting of reed vegetation. Optimal predatory fish stock contributes to water quality improvement, but only if combined with favourable loading and physical conditions. Within limits, the presence of a wetland zone around lakes may thus increase the ability of lakes to cope with nutrients and enhance restoration. Validation of the conclusions in real lakes is recommended, a task hampered by the fact that, in the Netherlands, many wetland zones have disappeared in the past.
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Affiliation(s)
- J H Janse
- National Institute of Public Health and Environment (RIVM), Laboratory of Water and Drinking Water Research, Bilthoven, The Netherlands.
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26
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Havens KE, Jin KR, Rodusky AJ, Sharfstein B, Brady MA, East TL, Iricanin N, James RT, Harwell MC, Steinman AD. Hurricane effects on a shallow lake ecosystem and its response to a controlled manipulation of water level. ScientificWorldJournal 2001; 1:44-70. [PMID: 12805691 PMCID: PMC6084195 DOI: 10.1100/tsw.2001.14] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In order to reverse the damage to aquatic plant communities caused by multiple years of high water levels in Lake Okeechobee, Florida (U.S.), the Governing Board of the South Florida Water Management District (SFWMD) authorized a "managed recession" to substantially lower the surface elevation of the lake in spring 2000. The operation was intended to achieve lower water levels for at least 8 weeks during the summer growing season, and was predicted to result in a large-scale recovery of submerged vascular plants. We treated this operation as a whole ecosystem experiment, and assessed ecological responses using data from an existing network of water quality and submerged plant monitoring sites. As a result of large-scale discharges of water from the lake, coupled with losses to evaporation and to water supply deliveries to agriculture and other regional users, the lake surface elevation receded by approximately 1 m between April and June. Water depths in shoreline areas that historically supported submerged plant communities declined from near 1.5 m to below 0.5 m. Low water levels persisted for the entire summer. Despite shallow depths, the initial response (in June 2000) of submerged plants was very limited and water remained highly turbid (due at first to abiotic seston and later to phytoplankton blooms). Turbidity decreased in July and the biomass of plants increased. However, submerged plant biomass did not exceed levels observed during summer 1999 (when water depths were greater) until August. Furthermore, a vascular plant-dominated assemblage (Vallisneria, Potamogeton, and Hydrilla) that occurred in 1999 was replaced with a community of nearly 98% Chara spp. (a macro-alga) in 2000. Hence, the lake"s submerged plant community appeared to revert to an earlier successional stage despite what appeared to be better conditions for growth. To explain this unexpected response, we evaluated the impacts that Hurricane Irene may have had on the lake in the previous autumn. In mid-October 1999, this category 1 hurricane passed just to the south of the lake, with wind velocities over the lake surface reaching 90 km h(-1) at their peak. Output from a three-dimensional hydrodynamic/sediment transport model indicates that during the storm, current velocities in surface waters of the lake increased from near 5 cm s(-1) to as high as 100 cm s(-1). These strong velocities were associated with large-scale uplifting and horizontal transport of fine- grained sediments from the lake bottom. Water quality data collected after the storm confirmed that the hurricane resulted in lake-wide nutrient and suspended solids concentrations far in excess of those previously documented for a 10-year data set. These conditions persisted through the winter months and may have negatively impacted plants that remained in the lake at the end of the 1999 growing season. The results demonstrate that in shallow lakes, unpredictable external forces, such as hurricanes, can play a major role in ecosystem dynamics. In regions where these events are common (e.g., the tropics and subtropics), consideration should be given to how they might affect long-term lake management programs.
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Affiliation(s)
- K E Havens
- South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, Florida 3346-4680, USA.
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