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Stable isotope characteristics across narrow savanna/woodland ecotones in Wolfe Creek Meteorite Crater, Western Australia

  • Ecosystem ecology
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Abstract

The stable isotopic composition (δ13C) of sediments from lakes are frequently analyzed to reconstruct the proportion of the regional vegetation that used either the C3 or C4 photosynthetic pathways, often without conducting a detailed survey of the current local vegetation. We performed a study on the modern vegetation composition within the Wolfe Creek Meteorite Crater to complement our future paleoecological investigation of the crater. A bull’s-eye pattern exists where C4 grasses dominate an outer ring and salt tolerant species, including shrubs, herbs, chenopods, and halophytic algae, dominate the inner pan of the crater. The ecotone between the inner and outer zones is narrow and occupied by tall (>7 m) Acacia ampliceps, with some C4 grasses in the understory. Along with the highest water table and most saline soils the center of the crater has C3 plants present with the highest δ13C and δ15N values. The range of δ13C and δ15N values from the analysis of surface soil organic matter (OM) was much smaller compared with the range of values from plant materials implying that either: (1) the current plant OM has not yet been integrated into the soils, or (2) processes within the soil have acted to homogenize isotopic variability within the crater. The application of a two end member mixing model to calculate %C4 and %C3 biomass from the δ13C of surface soil OM was complicated by: (1) the crater containing both a dry habitat with C4 grasses and a central pan with C4 halophytic plants and, (2) the large variation in the δ13C of the plants and soil OM.

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Acknowledgments

We are grateful to the Billiluna aboriginal community, who allowed us to conduct our survey in the WCMC in 1999 and 2001. We also appreciated the assistance given by CALM, not least for allowing us to camp at the crater and for all the support given by their on-site rangers. We thank Gillian Atkin, Monique Belanger, Stephen DeVogel, Paul Hesse, Damian Kelleher, John Magee, Gifford Miller, Elizabeth Miller, Nigel Spooner, and Lynley Wallis for their company and assistance during fieldwork. We thank Gifford Miller and John Magee for surveying the topography of the crater and supplying us with the data from the survey. We also acknowledge Dana Swarth for measuring the moisture content of our soil samples. Our experiments comply with the current laws of the countries in which they were performed. This work was funded by an NSF grant (ATM 0081876 to MLF). We thank Chris Turney and two anonymous reviewers for their constructive and comprehensive suggestions for modifications to our paper.

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Authors and Affiliations

  1. Geophysical Laboratory, Carnegie Institution of Washington, 5152 Broad Branch Road NW, Washington, DC, 20015-1305, USA

    Matthew J. Wooller & Marilyn L. Fogel

  2. Department of Geology, Bates College, Lewiston, ME, 04240, USA

    Beverly J. Johnson & Andrew Wilkie

  3. Alaska Stable Isotope Facility, Water and Environmental Research Center and School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA

    Matthew J. Wooller

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  1. Matthew J. Wooller
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  4. Marilyn L. Fogel
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Correspondence to Matthew J. Wooller.

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Communicated by Lawrence Flanagan

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Wooller, M.J., Johnson, B.J., Wilkie, A. et al. Stable isotope characteristics across narrow savanna/woodland ecotones in Wolfe Creek Meteorite Crater, Western Australia. Oecologia 145, 100–112 (2005). https://doi.org/10.1007/s00442-005-0105-5

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