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Journal of Paleolimnology

, Volume 49, Issue 2, pp 117–127 | Cite as

Influence of sample location and livestock numbers on Sporormiella concentrations and accumulation rates in surface sediments of Lake Allos, French Alps

  • David EtienneEmail author
  • Bruno Wilhelm
  • Pierre Sabatier
  • Jean-Louis Reyss
  • Fabien Arnaud
Original paper

Abstract

Spores of coprophilous fungi, especially Sporormiella, are often well preserved in lake sediment cores. It has been hypothesized that such spores can be used to quantify past livestock abundance. The quantitative relationship between fungal spore abundance and livestock populations, however, is not well established, nor are the mechanisms of spore transport and deposition in lacustrine systems. Multiple cores from Lake Allos, a large high-elevation lake in the French Alps, were used to map the modern abundance of Sordaria and Sporormiella spores throughout the lake. We observed high spatial heterogeneity with respect to spore numbers. No correlation with the distance from shoreline was found. There was, however, a relation with distance from the two main lake inlets. These results were used to select two fungi-rich sediment cores to investigate grazing pressure over the last two centuries. Comparisons were made between spore influx and historic data on livestock densities in the catchment. A sharp decrease in Sporormiella influx ca. 1894–1895 was associated with a reported reduction in sheep in the Allos catchment at that time. Mean influx of Sporormiella decreased by a factor of three between the nineteenth and twentieth centuries, reflecting a reduction in the reported number of animals in the Lake Allos catchment, from 6,000 to 2,000. This study confirmed that Sporormiella spore abundance in lake sediments can be used as a proxy for catchment herbivore numbers in paleoecological reconstructions. Nevertheless, our data indicate that before spore accumulation can be used to infer past domestic herbivore density, one must understand the processes of coprophilous spore transfer from the catchment to the lake and the influence of core location on spore numbers in the sediment.

Keywords

Sporormiella Sordaria Coprophilous fungi Grazing reconstruction Modern sediment French Alps 

Notes

Acknowledgments

Logistical and financial support was provided by the French National Research Agency’s Pygmalion project (ANR BLAN07-2_204489) and the National Park of Mercantour. The authors thank Etienne Dambrine for his helpful comments and corrections on the manuscript. The comments of Melanie Riedinger-Whitmore and an anonymous reviewer greatly helped to improve the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • David Etienne
    • 1
    • 2
    Email author
  • Bruno Wilhelm
    • 3
  • Pierre Sabatier
    • 3
  • Jean-Louis Reyss
    • 4
  • Fabien Arnaud
    • 3
  1. 1.Chrono-environment LaboratoryUMR 6249, Université de Franche-Comté-CNRSBesançon CedexFrance
  2. 2.CARRTEL LaboratoryUniversité de SavoieLe Bourget du Lac CedexFrance
  3. 3.EDYTEM LaboratoryUMR 5204, Université de Savoie-CNRSLe Bourget du LacFrance
  4. 4.LSCE LaboratoryUMR 8212, Université de Versailles Saint-Quentin CEA-CNRSGif-sur-Yvette CedexFrance

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