Abstract
In arid central-west Argentina, South America, many wetlands have developed in association with rivers draining the Andean piedmont and are vital hotspots for resources. However, knowledge about their long-term evolution is generally scarce. The Bañados del Atuel wetland, a low gradient fluvio-aeolian plain linked to the Atuel-Diamante fluvial system, is analyzed to depict its geomorphological and sedimentological Holocene evolution. The study area comprises a fluvial fill terrace with fine-grained alluvial deposits (~ 4186–4419 cal years BP), deposited by a palaeodistributary fluvial system, that is covered by SW–NE oriented aeolian dune complexes. The present-day wetland, which developed after formation of the fill terrace, is characterized by: (1) a NW–SE oriented floodplain with distributary channels and fine-grained, massive to laminated deposits of low organic matter content, dated to 2755–2864 and 729–895 cal years BP, and includes SW–NE oriented dune systems and salt flat depressions; and (2) a transfer area with active headcutting channels, entrenched in the fill terrace, that connects the NW–SE oriented floodplain with (3) a saline endorheic depression (salt lake) with active deflation. The fill terrace distribution suggests much more extensive floodplain environments prior to the late Holocene; the present-day wetland is not older than the last 2–3 millennia and records a late Holocene trend of floodplain size reduction. Fluvial processes of avulsion were likely driven by mid and late Holocene El Niño Southern Oscillation (ENSO) events. Late Holocene arid conditions favoured aeolian dune formation and fluvio-aeolian interactions. Furthermore, anthropogenic river modifications, starting ~ 200 years ago, also have promoted severe changes in the Atuel-Diamante fluvial system, deepening the aridity in the wetland.
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Acknowledgements
Dr. Florencia Lorenzo’s studies were part of a PhD thesis research carried out with a grant of the National Research Council of Argentina (CONICET). We gratefully acknowledge Dr. Adriana Blasi (FCEyN - UNLP) for an early reading of the manuscript. Our gratitude is extended to the two anonymous reviewers, the Editor-in-Chief and the Guest Editor (Professor Stephen Tooth) for their suggestions and comments that improved and strengthened the manuscript.
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This work was funded by PICT 2012-1512 and PICT 2018-02465 from the ANPCyT, and PIO-12CO from CONICET-UNLPam.
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All authors contributed to the conceptualization of the study and its design, field work and the formal analysis and interpretation of data. AEM: funding acquisition; investigation; first manuscript draft; visualization; manuscript writing, reviewing and editing. MAZ: funding acquisition; investigation; supervision; manuscript writing; review. FRL: investigation; GIS software management; review.
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Mehl, A.E., Zárate, M.A. & Lorenzo, F.R. Holocene evolution of a floodplain wetland in the dryland piedmont of central-west Argentina. Wetlands Ecol Manage 30, 647–673 (2022). https://doi.org/10.1007/s11273-022-09880-6
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DOI: https://doi.org/10.1007/s11273-022-09880-6