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da Silva TT, Bortolini JC, Iatskiu P, Pilatti MC, Medeiros G, Amaral MWW, Guicho R, Bueno NC. Local environmental factors are the main drivers of phytoplankton biovolume in subtropical streams of Brazil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 926:171663. [PMID: 38485007 DOI: 10.1016/j.scitotenv.2024.171663] [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: 10/03/2023] [Revised: 03/08/2024] [Accepted: 03/10/2024] [Indexed: 03/25/2024]
Abstract
The ecological attributes of phytoplankton in freshwater environments are strongly influenced by limnological factors and temporal variability. In this study, we investigated the importance of local environmental and regional (spatial and landscape) predictors in structuring stream phytoplankton from the perspective of metacommunity theory. We seasonally sampled phytoplankton and abiotic variables from nine streams in three subtropical basins. Variation partitioning was used to investigate the influence of environmental, landscape, and spatial predictors on phytoplankton biovolume. Independent of the hydrological period (dry and rainy), the phytoplankton communities were predominantly structured by local environmental factors. In addition, the different land uses considered (landscape) showed weak significance during the dry season, with emphasis on the rural category. Biovolume values remained low, and diatoms and green algae were the most representative groups. Our findings are consistent with recognized ecological patterns for potamoplankton and emphasize local environmental filters as a fundamental regulator of phytoplankton biodiversity in lotic environments.
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Affiliation(s)
- Thaís Tagliati da Silva
- Programa de Pós-graduação em Conservação e Manejo de Recursos Naturais, Universidade Estadual do Oeste do Paraná, Universitária Street, 2019, Cascavel, Paraná 85819-110, Brazil
| | - Jascieli Carla Bortolini
- Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Esperança Ave, s/n, Goiânia, Goiás 74690-900, Brazil.
| | - Patricia Iatskiu
- Programa de Pós-graduação em Conservação e Manejo de Recursos Naturais, Universidade Estadual do Oeste do Paraná, Universitária Street, 2019, Cascavel, Paraná 85819-110, Brazil.
| | - Maria Clara Pilatti
- Programa de Pós-graduação em Conservação e Manejo de Recursos Naturais, Universidade Estadual do Oeste do Paraná, Universitária Street, 2019, Cascavel, Paraná 85819-110, Brazil
| | - Gabriela Medeiros
- Centro Universitário de Cascavel, 2317, Tito Muffato Ave, Cascavel, Paraná 85806-080, Brazil
| | | | - Ricardo Guicho
- Centro Universitário de Cascavel, 2317, Tito Muffato Ave, Cascavel, Paraná 85806-080, Brazil
| | - Norma Catarina Bueno
- Programa de Pós-graduação em Conservação e Manejo de Recursos Naturais, Universidade Estadual do Oeste do Paraná, Universitária Street, 2019, Cascavel, Paraná 85819-110, Brazil
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Johnston LH, Huang Y, Bermarija TD, Rafuse C, Zamlynny L, Bruce MR, Graham C, Comeau AM, Valadez-Cano C, Lawrence JE, Beach DG, Jamieson RC. Proliferation and anatoxin production of benthic cyanobacteria associated with canine mortalities along a stream-lake continuum. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170476. [PMID: 38290679 DOI: 10.1016/j.scitotenv.2024.170476] [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: 10/16/2023] [Revised: 01/24/2024] [Accepted: 01/24/2024] [Indexed: 02/01/2024]
Abstract
Proliferations of benthic cyanobacteria are increasingly in the public eye, with rising animal deaths associated with benthic rather than planktonic blooms. In early June 2021, two dogs died after consuming material on the shore of Shubenacadie Grand Lake, Nova Scotia. Preliminary investigations indicated anatoxins produced by benthic cyanobacterial mats were responsible for the deaths. In this study, we monitored the growth of a toxic benthic cyanobacterial species (Microcoleus sp.) along a stream-lake continuum where the canine poisonings occurred. We found that the species was able to proliferate in both lentic and lotic environments, but temporal growth dynamics and the predominant sub-species were influenced by habitat type, and differed with hydrodynamic setting, nutrient and sunlight availability. Toxin concentration was greatest in cyanobacterial mats growing in the oligotrophic lakeshore environment (maximum measured total anatoxins (ATXs) >20 mg·kg-1 wet weight). This corresponded with a shift in the profile of ATX analogues, which also indicated changing sub-species dominance along the stream-lake transition.
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Affiliation(s)
- Lindsay H Johnston
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada
| | - Yannan Huang
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada
| | - Tessa D Bermarija
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada
| | - Cheryl Rafuse
- Biotoxin Metrology, National Research Council Canada, 1411 Oxford St, Halifax, NS, Canada
| | - Lydia Zamlynny
- Biotoxin Metrology, National Research Council Canada, 1411 Oxford St, Halifax, NS, Canada
| | - Meghann R Bruce
- Canadian Rivers Institute, Department of Biology, University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada
| | - Catherine Graham
- Nova Scotia Department of Agriculture, Animal Health Laboratory, 65 River Rd, Bible Hill, NS, Canada
| | - André M Comeau
- Integrated Microbiome Resource (IMR), Dalhousie University, Halifax, Canada
| | - Cecilio Valadez-Cano
- Biology Department, University of New Brunswick, Fredericton, New Brunswick, Canada
| | - Janice E Lawrence
- Biology Department, University of New Brunswick, Fredericton, New Brunswick, Canada
| | - Daniel G Beach
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada; Biotoxin Metrology, National Research Council Canada, 1411 Oxford St, Halifax, NS, Canada
| | - Rob C Jamieson
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada.
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Fai PBA, Kenko DBN, Tchamadeu NN, Mbida M, Korejs K, Riegert J. Use of multivariate analysis to identify phytoplankton bioindicators of stream water quality in the monomodal equatorial agroecological zone of Cameroon. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:788. [PMID: 37261624 DOI: 10.1007/s10661-023-11390-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 05/12/2023] [Indexed: 06/02/2023]
Abstract
The aquatic ecosystem is compromised by many contaminants that may reduce ecosystem functions and severely affect human health. This study aimed at determining suitable phytoplankton bioindicators of water quality for biomonitoring of freshwater streams in the monomodal agroecological zone of Cameroon. Water physicochemical and hydrological parameters, together with phytoplankton abundance and diversity, were measured from June 2016 to May 2017 along the Benoe Stream. Principal component analysis and redundancy analysis were used to determine phytoplankton spatial and temporal distribution and identify indicator species. The Shannon-Wiener diversity and Pielou's evenness indices indicated a clean to mildly polluted stream with a diverse phytoplankton community consisting of 84 genera belonging to 51 families that was dominated by the Bacillariophyta (64%), followed by Chlorophyta (13%) and Cyanophyta (10%). The total dissolved solids, electrical conductivity, stream water velocity, and discharge were the most important stream characteristics affecting the abundance of the dominant phytoplankton genera. Seasonal variations in the stream characteristics as well as spatial community distribution along an urban-small-scale farming - large-scale farming gradient were unveiled and their influence on the phytoplankton relative abundances. Increased abundance of Synedra ulna was indicative of low TDS and EC, which was the contrary for Gyrosigma baltium dominance. High Pleurosira laevis abundance was associated with the urban zone while high Diatoma sp. and Oscillatoria sp. abundances were related to the large-scale farming zone of the stream. These phytoplankton species have good potential for use as bioindicators for stream water quality monitoring in the monomodal agroecological zone.
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Affiliation(s)
- Patricia Bi Asanga Fai
- Department of Animal Biology, Dschang School of Science and Technology, University of Dschang, BP 96 Dschang, Dschang, West Region, Cameroon.
- College of Technology, University of Bamenda, P.O. Box 70, Bambili, North West Region, Cameroon.
| | - Daniel Brice Nkontcheu Kenko
- Department of Animal Biology, Dschang School of Science and Technology, University of Dschang, BP 96 Dschang, Dschang, West Region, Cameroon
- Department of Animal Biology and Conservation, Faculty of Science, University of Buea, Buea, Cameroon
| | - Norbert Ngameni Tchamadeu
- Department of Animal Biology, Dschang School of Science and Technology, University of Dschang, BP 96 Dschang, Dschang, West Region, Cameroon
| | - Mpoame Mbida
- Department of Animal Biology, Dschang School of Science and Technology, University of Dschang, BP 96 Dschang, Dschang, West Region, Cameroon
| | - Krystof Korejs
- Department of Zoology, Faculty of Science, University of South Bohemia in České Budějovice, Branisovska, 1760 370 05, České Budějovice, South Bohemia, Czech Republic
| | - Jan Riegert
- Department of Zoology, Faculty of Science, University of South Bohemia in České Budějovice, Branisovska, 1760 370 05, České Budějovice, South Bohemia, Czech Republic
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Effects of Land Use and Physicochemical Factors on Phytoplankton Community Structure: The Case of Two Fluvial Lakes in the Lower Reach of the Yangtze River, China. DIVERSITY 2023. [DOI: 10.3390/d15020180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Potential changes in phytoplankton community structure in shallow lakes due to land use could pose a serious threat to ecosystem sustainability and functioning. Nevertheless, this effect has not been analyzed in detail. In this study, we chose two adjacent lakes, the main land use types around them are farmland and forest, respectively. We investigated the spatial differences in the phytoplankton community structure, water quality physicochemical parameters, and land use patterns in the two lakes. The results indicated that the annual average cell density and biomass of phytoplankton in the former were 1.84 times and 2.38 times that of the latter, respectively. The results of Pearson correlation and Redundancy analysis showed that total nitrogen (TN), total phosphorus (TP), water depth (WD), and water temperature (WT) were the main environmental factors influencing the structural changes of phytoplankton communities in the two lakes. The results indicated that different land use patterns, such as farmland and towns around the lake, increase the nitrogen (N) and phosphorus (P) content of the lake, while the forests distributed around the lake can reduce the N and P entering the lake, which is probably the main reason for the spatial difference in the characteristics of phytoplankton communities in the two lakes. Our results highlight that land use significantly affects the community structure of phytoplankton by influencing physicochemical factors in water bodies. Our study can provide guidance for pollution control and water quality management of shallow lakes.
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