2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2021 | 8:30 AM - 10:30 AM | Whole-microbial community (Bacteria, Archaea and Eukarya) assembly across the river continuum | Virtual Platform

Whole-microbial community (Bacteria, Archaea and Eukarya) assembly across the river continuum

Many environmental factors shift as water moves through a stream network, with consequences for biotic assembly. The River Continuum Concept (RCC) suggests that the quantity and quality of the energy source for most biota drives community assembly through different stream orders; in contrast, recent work shows that residence time of water in the network affects bacterial community assembly. This study evaluates whether community change in assemblages of different microbial groups through networks (stream orders 2-8) supports each hypothesis, with the prediction that archaeal, bacterial and eukaryal protistan heterotrophs will follow the residence time hypothesis, and photoautotrophic cyanobacteria and algae will follow the RCC. Stream order explains community variation in all groups, most strongly for bacterial and archaeal heterotrophs, followed by cyanobacteria, then algae, then protists (respectively, PERMANOVA: R2 = 19.8%, 13.6%, 11.1%, 10.4%; all p<0.001). Photoautotroph communities follow a RCC-like threshold pattern, with clearest shifts between stream orders 5 and 6; bacteria follow more of a gradient, supporting the residence time hypothesis; but protists fit neither model. Protists might not disperse from a terrestrial source, like bacteria, or as generalist grazers they might be insensitive to basal energy source.

Residence time
Biodiversity
Microbial ecology

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Presenters/Authors

Lydia Zeglin (), Kansas State University, lzeglin@ksu.edu;