Abstract
Diatoms have been proven to be good indicators of natural stream conditions, but little is known about the seasonal variability of diatom communities in megacity streams. We investigated the spatial and temporal variation of diatom communities along an urban-to-rural gradient in megacity streams, Beijing, China. We found that the composition and diversity of diatom community was significantly different along the urban-to-rural gradient in streams of Beijing city. The diatom community was subtle temporal variation in the reference stream and urban upstream, but the temporal variation of diatoms was relatively greater in the urban downstream. Overall, the composition of the diatom community was relatively stable in the streams among different seasons, and the dominant species did not change much over seasons. For example, during the sampling periods, the species Achnanthidium minutissimum in reference streams had the average relative abundance of 20.3 ± 3.5%; the species Pseudostaurosira brevistriata and Staurosira construens var. venter in urban upstream had average relative abundances of 17.0% ± 0.9% and 17.3% ± 1.2%, respectively; and the species Nitzschia palea in urban downstream had average relative abundances of 18.8 ± 4.7%. There were significant correlations between the relative abundances of the dominant species and environmental variables, suggesting that the environmental variables had significant effects on the diatom distribution. Our results demonstrate that the diatom communities are relatively stable among seasons in different sampling areas, suggesting that diatoms can be used as reliable indicators for the biological monitoring of water quality in megacity streams across seasons.




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Acknowledgements
Special thanks to the Beijing Urban Ecosystem Research Station for the assistance in the field or laboratory, and to the State Key Laboratory of Environmental Aquatic Chemistry for providing the microscope for diatom detection. We thank all the participants in the sample collection and data analysis.
Funding
The present study was financially supported by the National Natural Science Foundation of China (41907333), and the Natural Science Foundation of Hunan Province, China (2019JJ50707).
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Chen, X., Zhou, W., Luo, G. et al. Spatial and temporal variations of the diatom communities in megacity streams and its implications for biological monitoring. Environ Sci Pollut Res 27, 37581–37591 (2020). https://doi.org/10.1007/s11356-020-09743-8
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DOI: https://doi.org/10.1007/s11356-020-09743-8


