Impacts of Environmental Variables on a Phytoplankton Community: A Case Study of the Tributaries of a Subtropical River, Southern China

Hou, Zhaojiang; Jiang, Yuan; Liu, Qi; Tian, Yulu; He, Kai; Fu, Lan

doi:10.3390/w10020152

Cited by 16 publications

(7 citation statements)

References 35 publications

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“…Many of the green algal taxa encountered during the study are known to thrive in riverine ecosystems which also tend to be contaminated with different types of pollutants including inorganic nutrients such as forms of nitrogen and phosphorus (Zhu et al 2010, Zhou et al 2018. In the present study, occurrence of cell abundances representing several green algal taxa such as Scenedesmus sp.…”

Section: Discussionmentioning

confidence: 69%

Unusual abundance of bloom forming Aulacoseira spp. diatom populations in an anthropogenically impacted stretch of lower part of the River Ganga

Kumar

Ghosh

Yash

et al. 2022

Environ. Res. Commun.

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The River Ganga is reeling from pressures of rapid urbanization and resulting anthropogenic forcings. In this study, phytoplankton community assemblages were deduced from the Dakshineswar site located in the lower stretch of River Ganga to understand the health of this river. Surface water samples were collected from six stations of Dakshineswar spanning across monsoon and post-monsoon seasons of 2019 and 2020. Stations were categorized into point source and surface water based on proximity to municipal discharges. Measurement of in situ environmental parameters showed significant differences in dissolved oxygen, total dissolved solids, electrical conductivity and suspended particulate matter between the two seasons during the study period. In particular, concentrations of dissolved nitrate and silicate were found to be higher in point source stations compared to surface water stations. The concentration of Chlorophyll-a (Chl-a) was found to be higher in post-monsoon compared to monsoon seasons. Phytoplankton communities consisted of 23 diatom taxa and 14 green algal taxa and they showed distinct seasonal and spatial variations in the study site. Phytoplankton communities were dominated by diatom taxa namely Aulacoseira, Bacillaria, Coscinodiscus, and green algal taxa such as Ulothrix, Chlorella, and Scenedesmus. There was a dramatic increase in cell abundance of Aulacoseira spp. in post-monsoon seasons indicating a bloom-like scenario. Moreover, the rapid increase in cell abundance of Aulacoseira spp. also coincided with an increase in Chl-a and a sharp fall in the concentration of dissolved silicate. Some of the encountered phytoplankton taxa such as Tetraedron, Cosmarium, Nitzschia and Scenedesmus showed strong co-occurrence patterns indicating possible association at ecological scales. Four distinct clusters were formed by nMDS ordination plot based on the influences of environmental variables on encountered phytoplankton taxa. Network analysis revealed evidence of co-occurrence patterns between several diatoms and green algal taxa.

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Section: Discussionmentioning

confidence: 69%

Unusual abundance of bloom forming Aulacoseira spp. diatom populations in an anthropogenically impacted stretch of lower part of the River Ganga

Kumar

Ghosh

Yash

et al. 2022

Environ. Res. Commun.

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“…When the water flow slows, Cyanobacteria become dominant instead of Chlorophyta and vice versa. The dominance of phytoplankton changed from Chlorophyta to Cyanobacteria in the abundance of nutrients from sewage and industrial effluents in surface waters (Wang et al, 2015;Hou et al, 2018).…”

Section: Fig 3: Biochemical Contents Of Phytoplankton In Lake Manzalamentioning

confidence: 99%

Phytoplankton and Bacterial Dynamics Related to the Physicochemical Characteristics of Manzala Lake Water, Egypt

et al. 2022

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Egyptian Journal of Botany http://ejbo.journals.ekb.eg/ 61 M ANZALA Lake, the largest Egyptian northern lake, suffers from continuous deterioration as it receives huge amounts of different wastes. This study evaluated the abiotic and biotic conditions of the lake water (e.g., physicochemical variables, bacterial communities, and phytoplankton structures and their biochemical contents) from 11 sites along the lake in winter and summer 2020. The results revealed that the increase in phytoplankton densities and chlorophyll (a) in winter combined with increased nutrient contents. The highest concentrations of the biochemical contents of phytoplankton and the highest enumerations of bacterial indicators were recorded during summer. The sites close to the inlets of drains recorded a complete depletion of oxygen and a high ammonia content. The highest phytoplankton standing crop was recorded in the middle sector of the lake. Despite the efforts of the Egyptian government to rehabilitate Manzala Lake since 2017, the results showed an increase in pollution levels at various sites and the continued deterioration of the lake's ecological status. These results confirm the importance of increasing the efforts to restore the environmental health status of the lake, primarily by treating wastewater before it is discharged into the lake.

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“…Most microeukaryotes can be affected by several biological factors (such as predation) 8 , 9 and physical and chemical factors (including water temperature [WT], dissolved oxygen [DO], pH, and others). 10 , 11 Thus, exploring microeukaryote community compositions from various perspectives, including temporal as well as biotic and abiotic factors, is vital to understand freshwater ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Diversity of Microeukaryotes in the Han River, Korea Through 18S rRNA Gene Metabarcoding

Choi

Malik

et al. 2022

Evol Bioinform Online

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Freshwater ecosystems contain a large diversity of microeukaryotes that play important roles in maintaining their structure. Microeukaryote communities vary in composition and abundance on the basis of temporal and environmental variables and may serve as useful bioindicators of environmental changes. In the present study, 18S rRNA metabarcoding was employed to investigate the seasonal diversity of microeukaryote communities during four seasons in the Han River, Korea. In total, 882 unique operational taxonomic units (OTUs) were detected, including various diatoms, metazoans (e.g., arthropods and rotifers), chlorophytes, and fungi. Although alpha diversity revealed insignificant differences based on seasons, beta diversity exhibited a prominent variation in the community composition as per seasons. The analysis revealed that the diversity of microeukaryotes was primarily driven by seasonal changes in the prevailing conditions of environmental water temperature and dissolved oxygen. Moreover, potential indicator OTUs belonging to diatoms and chlorophytes were associated with seasonal and environmental factors. This analysis was a preliminary study that established a continuous monitoring system using metabarcoding. This approach could be an effective tool to manage the Han River along with other freshwater ecosystems in Korea.

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Impacts of Environmental Variables on a Phytoplankton Community: A Case Study of the Tributaries of a Subtropical River, Southern China

Cited by 16 publications

References 35 publications

Unusual abundance of bloom forming Aulacoseira spp. diatom populations in an anthropogenically impacted stretch of lower part of the River Ganga

Unusual abundance of bloom forming Aulacoseira spp. diatom populations in an anthropogenically impacted stretch of lower part of the River Ganga

Phytoplankton and Bacterial Dynamics Related to the Physicochemical Characteristics of Manzala Lake Water, Egypt

Seasonal Diversity of Microeukaryotes in the Han River, Korea Through 18S rRNA Gene Metabarcoding

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