2026-04-17T07:36:59Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/275242025-10-15T22:35:47Zcom_2072_452955com_2072_2054col_2072_452959col_2072_453077

00925njm 22002777a 4500 dc Freixa Casals, Anna author González Trujillo, Juan David author Sacristán-Soriano, Oriol author Borrego i Moré, Carles author Sabater, Sergi author 2024-10 Bacterial communities in river sediments are shaped by a trade-off between dispersal from upstream or nearby land and selection by the local environmental conditions. In temporary rivers (i.e. those characterized by long drying periods and subsequent rewetting) seasonal hydrological dynamics shape bacterial communities by connecting or disconnecting different river habitats. In this study, we tracked and compared the temporal and spatial changes in the composition of bacterial communities in streambed sediments and floodplain habitats across both permanent and intermittent river segments. Our findings revealed that environmental selection played a key role in assembling bacterial communities in both segments. We argue that distinct environmental features act as filters at the local scale, favoring specific bacterial taxa in isolated pools and promoting some typically terrestrial taxa in dry areas. Considering the prospective extension of drying intervals due to climate change, our results suggest an emerging trend wherein bacterial assemblages in temporary streams progressively incorporate microorganisms of terrestrial origin, well-adapted to tolerate desiccation phases. This phenomenon may constitute an integral facet of the broader adaptive dynamics of temporary river ecosystems in response to the impacts of climate change This research was funded by the project RIVSTRESS (PID2020-115708RB-C22) of the Spanish Ministry of Science and Innovation (MCIN). We acknowledge funding from the CERCA program and the support through the Consolidated Research Group ICRA-ENV 2021 SGR 01282. A.F. acknowledges the Juan de la Cierva program (IJC2019-039181-I) funded by MCIN/AEI 15 http://hdl.handle.net/10256/27524 Ecologia microbiana Microbial ecology Bacteris Bacteria Sediments fluvials -- Aspectes ambientals River sediments -- Environmental aspects Terrestrialization of sediment bacterial assemblages when temporary rivers run dry