Frontiers in Microbiology, Journal Year: 2024, Volume and Issue: 15

Published: Dec. 11, 2024

Sediments are key reservoirs for rare bacterial biospheres that provide broad ecological services and resilience in riverine ecosystems. Compared with planktons, there is a lack of knowledge regarding the differences between abundant taxa benthic bacteria along large river. Here, we offer comprehensive insights into spatiotemporal distributions, co-occurrence networks, assembly processes three divided categories namely always (ART), conditionally (CRT), (CRAT) sediments covering distance 4,300 km Yangtze River. Our study demonstrated ART/CRT contributed greatly to higher Chao-1 index, Shannon-Wiener phylogenetic alpha diversity autumn than spring. ART showed high overall beta diversity, CRT/CRAT exhibited more significant distance-decay patterns both seasons, mainly corresponding macroscopic landform types. CRT predominated nonrandom network, 97% keystone species mostly affiliated Acidobacteriota flourishing lower-reach plain. Two selection had greatest influences on (74.7–77.6%), whereas CRAT were driven primarily by dispersal limitation (74.9–86.8%) heterogeneous (33.9–48.5%) undominated stochasticity (32.7–36.5%). Natural factors such as river flow channel slope correlations community variation nutrients all groups, total organic carbon mediated balance among distinct seasons. Taken together, these results an improved understanding discrepancy biogeographic Asia’s largest

Language: Английский