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Hasan MM, Gani MA, Alfasane MA, Ayesha M, Nahar K. Benthic diatom communities and a comparative seasonal-based ecological quality assessment of a transboundary river in Bangladesh. PLoS One 2023; 18:e0291751. [PMID: 37792863 PMCID: PMC10550107 DOI: 10.1371/journal.pone.0291751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 09/05/2023] [Indexed: 10/06/2023] Open
Abstract
Seasonality can play a crucial role in altering water quality in tropical rivers, and as a benthic community, diatom can show seasonal variation and changes in ecological status. During the present study, the Trophic Diatom Index (TDI) and Water Quality Index (WQI) were used to determine the ecological status of a transboundary river, the Sari-Goyain River in Bangladesh. Samplings were carried out from upstream to downstream river sites in wet and dry seasons to observe the seasonal dynamics. The benthic diatom composition and physicochemical parameters showed seasonal variation in ecological water quality assessment. In the River, 42 different diatom species from 19 genera were recorded. The mean TDI values indicated an oligotrophic condition of the river in both seasons. But, the WQI values showed excellent and good water quality in the wet and dry seasons, respectively. So, the WQI was helpful in assessing seasonal variation of ecological water quality status in the Sari-Goyain River. For the long-term monitoring of the ecological status of the river, seasonal variation and WQI-based assessment should be considered.
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Affiliation(s)
- Md Mehedi Hasan
- Department of Botany, Jagannath University, Dhaka, Bangladesh
| | - Md Ataul Gani
- Department of Botany, Jagannath University, Dhaka, Bangladesh
| | | | - Mst Ayesha
- Department of Botany, University of Dhaka, Dhaka, Bangladesh
| | - Khurshid Nahar
- Department of Botany, Jagannath University, Dhaka, Bangladesh
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Łysko A, Popiela A, Forczmański P, V. AM, Lukács BA, Barta Z, Maćków W, Wolski GJ. Comparison of discriminant methods and deep learning analysis in plant taxonomy: a case study of Elatine. Sci Rep 2022; 12:20450. [PMID: 36443472 PMCID: PMC9705712 DOI: 10.1038/s41598-022-24660-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 11/18/2022] [Indexed: 11/29/2022] Open
Abstract
Elatine is a genus in which, flower and seed characteristics are the most important diagnostic features; i.e. seed shape and the structure of its cover found to be the most reliable identification character. We used a combination of classic discriminant methods by combining with deep learning techniques to analyze seed morphometric data within 28 populations of six Elatine species from 11 countries throughout the Northern Hemisphere to compare the obtained results and then check their taxonomic classification. Our findings indicate that among the discriminant methods, Quadratic Discriminant Analysis (QDA) had the highest percentage of correct matching (mean fit-91.23%); only the deep machine learning method based on Convolutional Neural Network (CNN) was characterized by a higher match (mean fit-93.40%). The QDA method recognized the seeds of E. brochonii and E. orthosperma with 99% accuracy, and the CNN method with 100%. Other taxa, such as E. alsinastrum, E. trianda, E. californica and E. hungarica were matched with an accuracy of at least 95% (CNN). Our results indicate that the CNN obtains remarkably more accurate classifications than classic discriminant methods, and better recognizes the entire taxa pool analyzed. The least recognized species are E. macropoda and E. hexandra (88% and 78% match).
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Affiliation(s)
- Andrzej Łysko
- grid.411391.f0000 0001 0659 0011Faculty of Computer Science and Information Technology, West Pomeranian University of Technology in Szczecin, Szczecin, Poland
| | - Agnieszka Popiela
- grid.79757.3b0000 0000 8780 7659Institute of Biology, University of Szczecin, Szczecin, Poland
| | - Paweł Forczmański
- grid.411391.f0000 0001 0659 0011Faculty of Computer Science and Information Technology, West Pomeranian University of Technology in Szczecin, Szczecin, Poland
| | - Attila Molnár V.
- grid.7122.60000 0001 1088 8582Department of Botany, University of Debrecen, Debrecen, Hungary ,ELKH-DE Conservation Biology Research Group, Debrecen, Hungary
| | - Balázs András Lukács
- ELKH-DE Conservation Biology Research Group, Debrecen, Hungary ,grid.481817.3Wetland Ecology Research Group, Centre of Ecological Research, Debrecen, Hungary
| | - Zoltán Barta
- grid.7122.60000 0001 1088 8582ELKH-DE Behavioural Ecology Research Group, Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, Hungary
| | - Witold Maćków
- grid.411391.f0000 0001 0659 0011Faculty of Computer Science and Information Technology, West Pomeranian University of Technology in Szczecin, Szczecin, Poland
| | - Grzegorz J. Wolski
- grid.10789.370000 0000 9730 2769Department of Geobotany and Plant Ecology, Faculty of Biology and Environmental Protection, University of Łódź, ul. Banacha 12/16, 90-237 Łódź, Poland
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Persistent Cyanobacteria Blooms in Artificial Water Bodies-An Effect of Environmental Conditions or the Result of Anthropogenic Change. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19126990. [PMID: 35742239 PMCID: PMC9223187 DOI: 10.3390/ijerph19126990] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/31/2022] [Accepted: 06/06/2022] [Indexed: 02/01/2023]
Abstract
Algal blooms are an emerging problem. The massive development of phytoplankton is driven partly by the anthropogenic eutrophication of aquatic ecosystems and the expansion of toxic cyanobacteria in planktonic communities in temperate climate zones by the continual increase in global temperature. Cyanobacterial harmful algal blooms (CyanoHABs) not only disturb the ecological balance of the ecosystem, but they also prevent the use of waterbodies by humans. This study examines the cause of an unusual, persistent bloom in a recreational, flow-through reservoir; the findings emphasize the role played by the river supplying the reservoir in the formation of its massive cyanobacterial bloom. Comprehensive ecosystem-based environmental studies were performed, including climate change investigation, hydrochemical analysis, and bio-assessment of the ecological state of the river/reservoir, together with monitoring the cyanobacteria content of phytoplankton. Our findings show that the persistent and dominant biomass of Microcystis was related to the N/P ratio, while the presence of Aphanizomenon and Dolichospermum was associated with the high-temperature end electric conductivity of water. Together with the increase in global temperature, the massive and persistent cyanobacterial bloom appears to be maintained by the inflow of biogenic compounds carried by the river and the high electric conductivity of water. Even at the beginning of the phenomenon, the reservoir water already contained cyanobacterial toxins, which excluded its recreational use for about half the year.
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Szczepocka E, Nowicka-Krawczyk P, Olszyński RM, Żelazna-Wieczorek J. Response of diatom assemblages to the disruption of the running water continuum in urban areas, and its consequences on bioassessment. PeerJ 2021; 9:e12457. [PMID: 34900419 PMCID: PMC8621708 DOI: 10.7717/peerj.12457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 10/18/2021] [Indexed: 11/20/2022] Open
Abstract
Transformation of river and stream channels disrupts their natural ecological cycles and interrupts the continuum of their ecosystems. Changes in natural hydromorphological conditions transform lotic communities into those atypical of flowing waters, resulting in bioassessment procedures yielding incorrect results. This study shows how hydromorphological transformations of ecosystems affect the ecological status bioassessment results by disturbing diatom communities typical for rivers. Moreover, the article presents a new biological assessment procedure for urban transformed rivers including the verification of the community structure based on autecology and quantity of species. The ecological status of the ecosystem was assessed using benthic diatom assemblages and supported with results of hydrochemical analysis. The structure of the assemblages and their relationships between individual sampling sites were clarified by shade plot and multivariate data analyses. The analysis of dominant species vitality at sampling sites and their autecology gave the foundation for modification of taxa data matrix and recalculation the diatom indices. Biological assessment showed that one of the artificial ponds constructed at the stream channel was characterized by good ecological status, and its presence strongly affected the state of the downstream ecosystem following the development of a unique assemblage of diatoms that prefer oligosaprobic and oligotrophic waters. The presence of these species was also noted in the downstream sections, but most of the cells were dead. As the indicator values of these taxa are high, their presence artificially increased the ecological status of the stream, resulting in the hydrochemical assessment not being in line with the bioassessment. Therefore, a new procedure was adopted in which non-characteristic taxa for the downstream sections were excluded from analysis. This approach corrected the results of bioassessment characterizing the ecological status of the stream as poor along its entire course, with the exception of this unique pond. For hydromorphologically transformed streams and rivers with disturbed channel continuity, the correct result of an incorrect diatom-based bioassessment may be retrieved after excluding species unusual for the type of ecosystem from the studied assemblages, i.e., the species which are unable to reproduce in that area and are only carried into it by the water flow. Assessment of the ecological status of aquatic ecosystems based on biotic factors is an essential tool of aquatic ecosystems monitoring in many countries. This type of assessment requires a multifaceted approach, in particular, to identify factors that may disrupt this assessment. Standardization of biomonitoring methods is an important step in correct assessment; thus, the findings of this paper will be useful in routine biomonitoring around the world.
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Affiliation(s)
- Ewelina Szczepocka
- Faculty of Biology and Environmental Protection, Department of Algology and Mycology, University of Lodz, Łódź, Poland
| | - Paulina Nowicka-Krawczyk
- Faculty of Biology and Environmental Protection, Department of Algology and Mycology, University of Lodz, Łódź, Poland
| | - Rafał M Olszyński
- Faculty of Biology and Environmental Protection, Department of Algology and Mycology, University of Lodz, Łódź, Poland
| | - Joanna Żelazna-Wieczorek
- Faculty of Biology and Environmental Protection, Department of Algology and Mycology, University of Lodz, Łódź, Poland
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Dalu T, Cuthbert RN, Taylor JC, Magoro ML, Weyl OLF, Froneman PW, Wasserman RJ. Benthic diatom-based indices and isotopic biomonitoring of nitrogen pollution in a warm temperate Austral river system. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 748:142452. [PMID: 33113700 DOI: 10.1016/j.scitotenv.2020.142452] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 09/13/2020] [Accepted: 09/14/2020] [Indexed: 06/11/2023]
Abstract
Rivers are impacted by pollutants from anthropogenic activities such as urbanisation and agricultural practices. Whilst point source pollution has been widely studied and in some cases remediated, non-point pollutant sources remain pervasive, particularly in developing countries that lack economic and human specialist capacity. Monitoring of pollution levels in many regions is additionally challenged by a lack of robust indicators for nitrogen inputs, however, diatom community indices and analysis of variation in microphytobenthos (MBP) stable isotope analysis variations have potential. The present study investigates variations and utilities in benthic diatom indices and MPB δ15N along different river sections (n = 31) of an austral river between two seasons (wet and dry), testing for relationships with key environmental variables (physical, water and sediment), in the context of N monitoring. One hundred and eighteen diatom taxa belonging to 36 genera were identified, with physical (water flow), water (nitrate, P and total dissolved solids) and sediment (B, Ca, Cr, Na, N, P, SOM, Pb and Zn) variables correlating to one or more of the 12 diatom indices presented. In particular, Biological Diatom Index, Biological Index of Water Quality, Central Economic Community, Index of Artois-Picardie Diatom (IDAP) and Sládeček's Index were strongly explained by sediment variables, whilst Descy's Pollution Index and Schiefele and Schreiner's Index were explained by water and physical variables. Whilst MPB δ15N were within the "no impact" level in the wet and dry seasons at reference (i.e. unpolluted) sites, all sites located in agricultural or urban areas, and downstream of sewage discharges, had a wider range that encompassed increasing organic impacts ("inorganic impacts" to high "organic impacts"). Temperature and turbidity (negative), as well as dissolved oxygen, waterway width and depth (positive), significantly affected MPB δ15N, whilst effects of chemistry variables were less apparent. Overall, we found that MPB δ15N signatures were significantly correlated with Trophic Diatom Index, the Specific Pollution Sensitivity Index and the Artois-Picardie Diatom Index, suggesting the utility of diatoms and MPB δ15N in assessments of aquatic pollution. In turn, MPB δ15N values are strong indicators of N pollution across spatial and seasonal gradients. Thus, the results showed the effects of sediment variables on diatoms to be strong, indicating that sediment rather than water characteristics more strongly structure diatom communities. Thus, sediment variables should be sampled when conducting bioassessment studies.
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Affiliation(s)
- Tatenda Dalu
- Aquatic Systems Research Group, Department of Ecology and Resource Management, University of Venda, Thohoyandou 0950, South Africa; South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa.
| | - Ross N Cuthbert
- South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa; GEOMAR, Helmholtz-Zentrum für Ozeanforschung Kiel, 24105 Kiel, Germany
| | - Jonathan C Taylor
- South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa; Unit for Environmental Science and Management, North-West University, Potchefstroom 2520, South Africa
| | - Mandla L Magoro
- South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa; DSI/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa
| | - Olaf L F Weyl
- DSI/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa
| | - P William Froneman
- Department of Zoology and Entomology, Rhodes University, Makhanda 6140, South Africa
| | - Ryan J Wasserman
- South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa; Department of Zoology and Entomology, Rhodes University, Makhanda 6140, South Africa
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Olszyński RM, Szczepocka E, Żelazna-Wieczorek J. Critical multi-stranded approach for determining the ecological values of diatoms in unique aquatic ecosystems of anthropogenic origin. PeerJ 2019; 7:e8117. [PMID: 31824763 PMCID: PMC6899344 DOI: 10.7717/peerj.8117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 10/29/2019] [Indexed: 12/05/2022] Open
Abstract
Background The ecological state of surface waters is typically assessed by a multi-aspect approach based on a determination of its chemical and physical parameters, by hydromorphology and the use of indicator organisms such as benthic diatoms. By assigning ecological indicator values, it is possible to create diatom indices which serve as the basic tool in assessing the ecological status of surface waters. These ecological indicator values are set according to classification systems, such as the Van Dam, Mertens & Sinkeldam (1994) system, which classifies species of diatoms according to seven different ecological factors. However, recent studies on the autecology of diatoms have shown the need to verify and establish new ecological indicator values. To this end, aquatic ecosystems are good environments to observe the range of tolerance of benthic diatoms to environmental conditions due to their unique physical and chemical parameters. The aim of the present study was to propose the establishment of new, or altered, ecological indicator values, according to the Van Dam, Mertens & Sinkeldam (1994) classification, of species of diatoms characteristic of three post-mining aquatic ecosystems. Methods In total, 36 species were identified that were characteristic of three waterbodies: a salt aquatic complex (water outflow, a drainage ditch and a pond), mined iron ore reservoirs and a mined lignite reservoir. Their ecological indicator values were specified using OMNIDIA software, and the environmental conditions prevailing in the studied ecosystems were determined. Of the 36 characteristic species, 16 lacking at least one assigned ecological indicator value were analyzed further. The analysis identified three groups of selected characteristic species which showed a correlation, or lack of such, to the tested physical and chemical parameters. Results Based on this multistage study of the autecology of characteristic diatoms, comprising an analysis of environmental conditions, literature analysis and reference ecological indicator values of other species, it is proposed that 32 ecological indicator values be established or adjusted for 16 species, and that Planothidium frequentissimum be excluded from water quality assessments.
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Affiliation(s)
- Rafał M Olszyński
- University of Lodz, Faculty of Biology and Environmental Protection, Depertment of Algology and Mycology, Lodz, Poland
| | - Ewelina Szczepocka
- University of Lodz, Faculty of Biology and Environmental Protection, Depertment of Algology and Mycology, Lodz, Poland
| | - Joanna Żelazna-Wieczorek
- University of Lodz, Faculty of Biology and Environmental Protection, Depertment of Algology and Mycology, Lodz, Poland
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