Dynamics of microbiotic patterns reveal surface water groundwater interactions in intermittent and perennial streams.

Autor: Korbel KL; Department of Biological Sciences, Macquarie University, NSW 2109, Australia. Electronic address: Kathryn.Korbel@mq.edu.au., Rutlidge H; Water Research Laboratory, School of Civil & Environmental Engineering, UNSW, Sydney, NSW 2052, Australia., Hose GC; Department of Biological Sciences, Macquarie University, NSW 2109, Australia., Eberhard SM; Subterranean Ecology Pty Ltd, Coningham, TAS 7054, Australia; Adjunct Affiliate University of New South Wales, Australia; Honorary Associate Western Australian Museum, Australia., Andersen MS; Water Research Laboratory, School of Civil & Environmental Engineering, UNSW, Sydney, NSW 2052, Australia.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Mar 10; Vol. 811, pp. 152380. Date of Electronic Publication: 2021 Dec 14.
DOI: 10.1016/j.scitotenv.2021.152380
Abstrakt: Exchange between groundwater (GW), hyporheic zone waters (HZ) and surface waters (SW) is critical for water quality, quantity, and the ecological health and functioning of all three ecosystems. Hydrological exchange is particularly important in intermittent creeks, such as in the Murray Darling Basin, Australia, where stream reaches shift from losing to gaining depending on the volume of surface flows. In this study we used hydrochemistry to identify SW-GW exchange and combined this with eDNA data to analyse the response of eukaryote and prokaryote communities to differing flow conditions within intermittent and perennial stream reaches. Our study suggested that SW and GW microbial communities were only around 30% similar. Differences in microbiota between SW, HZ and GW habitats were driven by changes in relative abundances of surface water dominant organisms (such as those capable of photosynthesis) as well as anaerobic taxa typical of GW environments (e.g., methanogens), with GW and HZ microbial communities becoming increasingly different to those in SW as flow ceased in intermittent creeks. Fine-scale hydrologic changes were identified through microbial communities in the perennial Maules Creek, indicating the importance of GW-SW exchange to biotic communities. This study highlights the importance of flow in shaping microbial communities and biogeochemical cycling within intermittent creeks and their connected alluvial aquifers. Our results suggest that microbiota may prove a useful indicator of SW-GW exchange, and in some circumstances, may be more sensitive in demonstrating fine-scale changes in SW-GW interactions than water chemistry. This knowledge furthers our understanding of GW-SW exchange and its impacts on ecological health.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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