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Haque MA, Jewel MAS, Akhi MM, Atique U, Paul AK, Iqbal S, Islam MS, Das SK, Alam MM. Seasonal dynamics of phytoplankton community and functional groups in a tropical river. ENVIRONMENTAL MONITORING AND ASSESSMENT 2021; 193:704. [PMID: 34623504 DOI: 10.1007/s10661-021-09500-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 09/30/2021] [Indexed: 06/13/2023]
Abstract
Functional classification of phytoplankton could be a valuable tool in water quality monitoring in the eutrophic riverine ecosystems. This study is novel from the Bangladeshi perspective. In this study, phytoplankton cell density and diversity were studied with particular reference to the functional groups (FGs) approach during pre-monsoon, monsoon, and post-monsoon at four sampling stations in Karatoya River, Bangladesh. A total of 54 phytoplankton species were recorded under four classes, viz. Chlorophyceae (21 species) Cyanophyceae (16 species), Bacillariophyceae (15 species), and Euglenophyceae (2 species). A significantly higher total cell density of phytoplankton was detected during the pre-monsoon season (24.20 × 103 cells/l), while the lowest in monsoon (9.43 × 103 cells/l). The Shannon-Wiener diversity index varied significantly (F = 16.109, P = 000), with the highest value recorded during the post-monsoon season. Analysis of similarity (ANOSIM) identified significant variations among the three seasons (P < 0.0001, R = 0.9518). The similarity percentage (SIMPER) analysis pinpointed Ulothrix spp. (Melosira granulate and Cymbella spp.) as the most contributory species are causing such a noticeable difference. Fifty-four phytoplankton species recorded during the study period were classified into 20 functional groups, whereas D/J/M/MP/X1 was considered the most abundant FG in the Karatoya River. FGs of the Karatoya River were influenced mainly by the nutrients (PO4-P and NO3-N) enrichments. As a novel investigation on FGs of phytoplankton in Bangladesh, this study recommends additional surveys in other rivers and floodplains to improve our understanding of phytoplankton diversity and functional groups.
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Affiliation(s)
- Md Ayenuddin Haque
- Department of Fisheries, Faculty of Agriculture, University of Rajshahi, 6205, Rajshahi, Bangladesh
| | - Md Abu Sayed Jewel
- Department of Fisheries, Faculty of Agriculture, University of Rajshahi, 6205, Rajshahi, Bangladesh
| | - Most Mahmuda Akhi
- Department of Fisheries, Faculty of Agriculture, University of Rajshahi, 6205, Rajshahi, Bangladesh
| | - Usman Atique
- Department of Bioscience and Biotechnology, Chungnam National University, Daejeon, South Korea.
- Department of Fisheries and Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan.
| | - Alok Kumar Paul
- Department of Fisheries, Faculty of Agriculture, University of Rajshahi, 6205, Rajshahi, Bangladesh
| | - Sonia Iqbal
- Department of Fisheries and Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - M Shahanul Islam
- Faculty of Food Engineering and Biotechnology, Tianjin University of Science and Technology University, TEDA, No 29, Tianjin, China
| | - Simon Kumar Das
- Department of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM, 43600, Bangi, Selangor, D.E, Malaysia
- Marine Ecosystem Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - M Manjurul Alam
- Department of Fisheries, Faculty of Agriculture, University of Rajshahi, 6205, Rajshahi, Bangladesh
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Sima W, Hu M, He Q, Qiu Y, Lv Y, Dai L, Shao Q, Zhou T, Li H, Zhou M, Ai H, Zhan H. Regulation of nitrogen dynamics at the sediment–water interface during HAB degradation and subsequent reoccurrence. RSC Adv 2020; 10:13480-13488. [PMID: 35493021 PMCID: PMC9051457 DOI: 10.1039/c9ra10673a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 05/12/2020] [Accepted: 03/23/2020] [Indexed: 11/21/2022] Open
Abstract
The effects of harmful algal blooms (HABs) on nutrient dynamics have been extensively studied; however, the response of nitrogen to continuous HAB degradation and subsequent reoccurrence is not well understood. Here, a small-scale experiment was conducted to assess how nitrogen in the sediment–water interface (SWI) responds to HAB degradation and subsequent reoccurrence at different initial algal densities. The results showed that during the algae decomposition stage, the NH4+–N flux of the SWI remained positive but decreased with the increase in algal density from 3.5 × 107 to 2.3 × 108 cells per L, indicating that the sediment was the source of NH4+–N. In contrast, the deposit was a sink of NO3−–N. However, during the reoccurrence of HAB, the distribution of NH4+–N and NO3−–N fluxes was completely converted. Nitrogen flux analysis throughout algae decomposition and reoccurrence indicated that although the sediment acted as a sink of nitrogen, the flux was dependent on the initial algal density. Our results confirmed that algae decomposition and reoccurrence would greatly affect the nitrogen cycle of the SWI, during which dissolved oxygen (DO) and initial algal density dominated. This study is the first to show that the regulation of nitrogen flux and migration changes during continuous HAB decomposition and subsequent reoccurrence. The effects of harmful algal blooms (HABs) on nutrient dynamics have been extensively studied; however, the response of nitrogen to continuous HAB degradation and subsequent reoccurrence is not well understood.![]()
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