Temperature‐mediated microbial carbon utilization in China's lakes

Abstract

Microbes play an important role in aquatic carbon cycling but we have a limited understanding of their functional responses to changes in temperature across large geographic areas. Here, we explored how microbial communities utilized different carbon substrates and the underlying ecological mechanisms along a space-for-time substitution temperature gradient of future climate change. The gradient included 47 lakes from five major lake regions in China spanning a difference of nearly 15°C in mean annual temperatures (MAT). Our results indicated that lakes from warmer regions generally had lower values of variables related to carbon concentrations and greater carbon utilization than those from colder regions. The greater utilization of carbon substrates under higher temperatures could be attributed to changes in bacterial community composition, with a greater abundance of Cyanobacteria and Actinobacteriota and less Proteobacteria in warmer lake regions. We also found that the core species in microbial networks changed with increasing temperature, from Hydrogenophaga and Rhodobacteraceae, which inhibited the utilization of amino acids and carbohydrates, to the CL500-29-marine-group, which promoted the utilization of all almost carbon substrates. Overall, our findings suggest that temperature can mediate aquatic carbon utilization by changing the interactions between bacteria and individual carbon substrates, and the discovery of core species that affect carbon utilization provides insight into potential carbon sequestration within inland water bodies under future climate warming.

Understanding Salinity-Driven Modulation of Microbial Interactions: Rhizosphere versus Edaphic Microbiome Dynamics

“…The species composition of microbial communities was estimated using the R "amplicon" package [50]. A linear regression analysis was conducted to examine the impact of salinity on the alterations in microbial alpha diversity and ASV relative abundance using the "ggpmisc" package in R, and p-values were calculated to determine whether the results were reliable [51]. The PERMANOVA test was used to detect whether there were significant differences in community composition between groups [52].…”

Composition, Dynamic Changes, and Carbon Sequestration Effects of Organic Carbon in the Water of a Penaeus vannamei Culture Pond

“…Additionally, water temperature also affects the chemical balance of a series of C elements. Through these influences, high or low water temperatures can affect the utilization of organic carbon by phytoplankton, microorganisms, and even aquaculture organisms [55][56][57] and ultimately affect the DOC contents in the water of aquaculture ponds.…”

Enhancing the engineering design of diversion routes to safeguard water quality: New insights from a carbon cycling perspective

“…Closed systems with rigorous protection measures, such as the Middle Route, shift the balance between stochastic and deterministic assembly processes toward determinism when subjected to high selection pressures. 54 These intense selection processes might cause opportunistic species that have good adaptation mechanisms to the unique habitat to prevail in the community and impair community metabolic functions, 44 impeding the previously consistent biological cycles of substances. Correspondingly, environmental generalist microbes, such as Flavobacteria and CL500-29-marine-group, which are pioneers in organic matter mineralization and capable of utilizing nearly all types of carbon substrates, 55,56 achieved limited growth in the system (Figurs S16 & S23).…”