Diversity and Potential Function of Prokaryotic and Eukaryotic Communities from Different Mangrove Sediments

Abstract

Mangrove trees generally play important roles in protecting intertidal ecosystems. The mangrove root-associated sediments provide a repertoire of microbial communities that contribute to pivotal ecological functions in the system. In the present study, we used the high-throughput sequencing and PICRUSt-predicted functional information (based on 16S/18S rDNA profiles) to investigate the bacterial, archaeal, and fungal communities in two mangrove systems, located in the estuary of the Jiulong River (China), with different contaminated conditions and frequencies of human activity. Diverse distribution patterns for microbial communities were observed in six sediment samples collected from the two survey areas, which were found to be related mainly to the substrates in mangrove sediments. The sediments were predominated by relatively higher ratios of heterotrophic bacteria that participated in the degradation of organic matters, including phylum of Chloroflexi, Acidobacteriota, Desulfobacterota, and Proteobacteria. In addition, Crenarchaeota and Ascomycota presented the highest abundances of archaea and fungi, respectively. The relatively high concentrations of calcium, nitrogen, magnesium, and phosphorus in mangrove sediments correlated significantly with the microbial communities. In addition, although the potential functions were similar in the two sites based on COG and KEGG pathways, the abundances of enzymes involved in the degradation processes of cellulose and hemicellulose and the metabolism of nitrogen and sulfur presented distinctions. These results provide insights into the environmental conditions shaping microbial assemblies of the mangrove sediments under the impacts of human activities; for instance, a more abundant amount of calcium was found in urban areas in this study.

Temperature‐mediated microbial carbon utilization in China's lakes

“…By linking microbial abundances to their utilization of carbon substrates along a large‐scale temperature gradient, our study suggests climate warming will reduce carbon sequestration in lakes. Consistent with others (Bowd et al, 2022; Hu et al, 2020; Li, Zhang, et al, 2022; Zhang, Gui, et al, 2022), we found that warming temperature could inhibit the abundance of Proteobacteria but promote the abundance of Cyanobacteria and Actinobacteriota. Cyanobacteria in particular tend to be temperature‐limited and can release bioavailable lipids and amino acids into freshwaters when temperature constrains are removed (Liu et al, 2020; Wagner et al, 2015).…”

Nitrogen cycling activities during decreased stratification in the coastal oxygen minimum zone off Namibia

“…However, metabolic activities toward oxidation of nitrogen compounds only involved nmo genes by Lokiarchaeum sp. (Figure 5B), potentially resulting in minor production of nitrite (Zhang et al, 2022). Consistent with the apparent lack of metabolic expression by anammoxrelated Planctomycetota (Figure 3C), we did not detect any ORF related to hydrazine (i.e., H 2 N 4 ) oxidoreductase (hzo) in shallow sediment (Kong et al, 2013).…”

Effects of Degradation on Microbial Communities of an Amazonian Mangrove

“…Recently, some researchers proposed to cluster these families into a phylum named Desulfobaterota [ 49 , 50 ]. The Anaerolineaceae family are anaerobic bacteria found in the upper zones of mangrove sediments that play a role in nitrate reduction to ammonium [ 51 ]. In preserved and recovery zones, we observed a high abundance of Thioalkalispiraceae, which are chemolithoautotrophic bacteria able to oxidize sulfur compounds and that have been obtained from soda lakes, hypersaline lakes, or marine environments, with specific NaCl concentration requirements for growth [ 52 ].…”