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Plant Ecology

, Volume 220, Issue 3, pp 393–403 | Cite as

Increased litter decomposition rates of exotic invasive species Hieracium pilosella (Asteraceae) in Southern Patagonia, Argentina

  • Karen BraunEmail author
  • M. B. Collantes
  • L. Yahdjian
  • C. Escartin
  • J. A. Anchorena
Article
  • 30 Downloads

Abstract

Plant invasions can affect key ecosystem processes regulating carbon and nutrient balances, i.e., litter decomposition. Exotic herb Hieracium pilosella (hawkweed, Asteraceae) recently invaded steppes of Tierra del Fuego island, Southern Patagonia, Argentina, where plant communities exhibit different vulnerabilities to invasion. To investigate H. pilosella invasion’s effects on litter decomposition, we conducted a field experiment in two plant communities, a tussock grassland and a grazing lawn, having contrasting environmental conditions and different vulnerabilities of being invaded by H. pilosella. At each community, we decomposed litter of dominant native species and of the exotic herb during 24 months. In addition, we characterized the litter qualities of the different species, and the microclimates of the communities. Exotic litter decomposition was remarkably faster and showed a higher association to microenvironmental variability compared to native litter decomposition. H. pilosella decomposed three-times faster than native litter in the moister, and more susceptible to invasion by H. pilosella plant community, the tussock grassland. By contrast, decomposition of native litter was not associated to the contrasting environmental conditions of the studied communities. Results suggest that introduced species may exhibit different ecosystem process rates and controls compared to resident species, affecting ecosystem nutrient and carbon cycles.

Keywords

Carbon cycle Grasslands Litter decomposition Ecosystem process Plant invasions 

Abbreviations

VPD

Vapor pressure deficit

MAP

Mean annual precipitation

Notes

Acknowledgements

We thank Jose Bonilla for excellent field assistance, and Mariana Capdet, Guadalupe de la Peña, and Ruth Rauber for laboratory assistance. Amy Austin made valuable suggestions at early stages of this project, and Roberto Fernandez Aldúcin gave useful insights into the microclimatic data. The studies reported in this article comply with the ethics guidelines and the current laws of the Republic of Argentina. This work and K.B.’s doctoral fellowship were supported by the Agencia Nacional de Promoción Científica y Tecnológica (BID-PICT 14198 and PICT 2010 0553).

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Laboratorio de Ecología de PastizalesMuseo Argentino de Ciencias Naturales “Bernardino Rivadavia”– CONICETBuenos AiresArgentina
  2. 2.IFEVA-CONICET, Facultad de AgronomíaUniversidad de Buenos AiresBuenos AiresArgentina

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