Abstract
Understanding the variability of bacterial communities in lake ecosystems is important as they play numerous roles, e.g., microbial loop and biodegradation of organic contaminants. Rapid bacterial responses to environmental conditions can thus influence the whole lake ecosystems and indirectly affect other communities in the environments. This chapter describes bacterial communities at the genus level in the water and sediment of Tonle Sap Lake (TSL) with particular attention to their spatiotemporal shifts and relationships with physicochemical factors. Synechococcus was the most detected genus in both lake water and sediment possibly owing to its connectivity with phylum Cyanobacteria which changes its dominance under the hydrodynamics of this river–lake system (i.e., the Tonle Sap River (TSR) and TSL). Microcystis increased its dominance in lake water during the transition from dry to rainy season, while Clostridium was abundant in the sediment. Moreover, most of the genera in lake water, including Mycobacterium, Synechococcus, Methylosinus, Hydrogenophaga, Polynucleobacter, Dechloromonas, Methylocaldum, and Steroidobacter, were statistically related to physicochemical factors, especially dissolved oxygen (DO) and pH. However, Dolichospermum correlated with DO, while Microcystis, Fluviicola, and Sphingomonas correlated with pH. These results are beneficial for further understanding the habitat heterogeneity of microbial communities and their environmental adaptation mechanisms in aquatic ecosystems.
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Ann, V., Ung, P., Peng, C., Fujii, M., Tanji, Y., Miyanaga, K. (2022). Bacterial Communities: Their Dynamics and Interactions with Physicochemical Factors. In: Yoshimura, C., Khanal, R., Sovannara, U. (eds) Water and Life in Tonle Sap Lake. Springer, Singapore. https://doi.org/10.1007/978-981-16-6632-2_27
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DOI: https://doi.org/10.1007/978-981-16-6632-2_27
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