Different Responses of Bacterial and Archaeal Communities in River Sediments to Water Diversion and Seasonal Changes

Abstract

In recent years, different responses of archaea and bacteria to environmental changes have attracted increasing scientific interest. In the mid-latitude region, Fen River receives water transferred from the Yellow River, electrical conductivity (EC), concentrations of Cl- and Na+ in water, total phosphorus (TP), and Olsen phosphorus (OP) in sediments were significantly affected by water transfer. Meanwhile, temperature and oxidation-reduction potential (ORP) of water showed significant seasonal variations. Based on 16S rRNA high-throughput sequencing technology, the composition of bacteria and archaea in sediments was determined in winter and summer, respectively. Results showed that the dominance of bacterial core flora decreased and that of archaeal core flora increased after water diversion. The abundance and diversity of bacterial communities in river sediments were more sensitive to anthropogenic and naturally induced environmental changes than that of archaeal communities. Bacterial communities showed greater resistance than archaeal communities under long-term external disturbances, such as seasonal changes, because of rich species composition and complex community structure. Archaea were more stable than bacteria, especially under short-term drastic environmental disturbances, such as water transfer, due to their insensitivity to environmental changes. These results have important implications for understanding the responses of bacterial and archaeal communities to environmental changes in river ecosystems affected by water diversion.

Planktonic archaea reveal stronger dispersal limitation and more network connectivity than planktonic bacteria in the Jinsha River of southwestern China

“…This corroborates the partial Mantel test which showed that, compared to bacteria, archaea with a more compact network structure was less affected by environmental heterogeneity. This microbial group‐dependent difference may be because the higher diversity and faster growth rates of bacteria respond more swiftly to environmental disturbance than archaea (Fierer & Jackson, 2006; Lv et al, 2021). Furthermore, we found that features of the microbial network varied among river reaches––that is, species connectivity of the archaeal network was lowest and that of bacterial network was highest in midstream.…”

Seasonal differences in intestinal flora are related to rats’ intestinal water metabolism

“…After literature review, we found that the aqueous environment, as among the necessary conditions for the survival of flora, is closely related to the changes in the composition of flora (Or et al, 2007;Dechesne et al, 2008;Young et al, 2008;Dechesne et al, 2010;Vos et al, 2013). On the other hand, both the aqueous environment and the flora composition vary seasonally (Lv et al, 2021). Therefore, the present study mainly attempts to understand the relationship between host's intestinal water metabolism and seasonal differences in intestinal flora.…”

Response of Hypolimnetic Water and Bottom Sediment Microbial Communities to Freshwater Salinization—A Microcosm Experiment

“…Thus, although the sedimentary samples have a proximal distribution, variations were present, particularly for archaeal and eukaryotic communities. In addition, while eukaryotes, even fungi [75], are more sensitive to chloride than prokaryotes, studies have shown that bacteria are more sensitive to chlorides [76] and to environmental variations [77] than archaea. Thus, a small proportion of the chloride entering the sediment would have a stronger effect on these domains than on the archaea.…”