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Diel cycles of δ13CDIC and ecosystem metabolism in ephemeral dryland streams

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Abstract

Streams in hot, arid environments often exist as a series of isolated pools along main channels. During these periods, shallow alluvial through flow may strongly influence key ecological processes within pools. We measured diel changes in δ13C values of dissolved inorganic carbon (DIC) and dissolved oxygen (DO) in two pools of ephemeral, dryland streams. We quantified alluvial water connectivity through stable isotope analysis (δ18O and δ2H) of pool and alluvial water. We also estimated gross primary productivity (GPP) and ecosystem respiration (ER) rates across a wider set of pools in both streams. δ13CDIC values displayed regular diel cycles, where both pools displayed small but similar daily amplitude (0.7–0.9‰) despite contrasting amplitudes of change in DO (0.8 mg L−1 vs. 2.8 mg L−1) and contrasting alluvial water connectivity (connected vs. disconnected). Water temperature was the strongest predictor of both δ13CDIC values and rates of change in δ13CDIC across both pools. Across both streams, all pools were net heterotrophic. GPP (0.35–1.73 g O2 m−2 d−1) and ER (0.49–2.64 g O2 m−2 d−1) rates were linked to aquatic vegetation cover. The disconnect between diurnal amplitudes of δ13C values and DO concentrations thus suggests that ecological drivers of gas exchange became increasingly localised as pools contracted.

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Acknowledgements

Funding for this study was provided by an Australian Research Council linkage grant to The University of Western Australia and Rio Tinto Iron Ore (LP0776626) and an Australian Research Council Future Fellowship awarded to Grzegorz Skrzypek (FT110100352). We thank Jordan Iles and Jennifer Kelley for access to unpublished data from subsequent samples from Coondiner Creek. The authors also wish to thank Kate Bowler and Doug Ford for laboratory assistance, and Grace Campbell, Romony Coyle, and Jennifer Kelley for assistance in the field. Our thanks to Chris Robinson and several anonymous reviewers who provided suggestions that greatly improved the quality of this article.

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  1. Ecosystems Research Group and West Australian Biogeochemistry Centre, School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia

    Andre R. Siebers, Neil E. Pettit, Grzegorz Skrzypek, Shawan Dogramaci & Pauline F. Grierson

  2. Rio Tinto Iron Ore, 152–158 St. Georges Terrace, Perth, WA, 6000, Australia

    Shawan Dogramaci

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  1. Andre R. Siebers
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Siebers, A.R., Pettit, N.E., Skrzypek, G. et al. Diel cycles of δ13CDIC and ecosystem metabolism in ephemeral dryland streams. Aquat Sci 82, 32 (2020). https://doi.org/10.1007/s00027-020-0708-2

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