Oecologia

, Volume 165, Issue 1, pp 261–269 | Cite as

Nitrogen deposition, competition and the decline of a regionally threatened legume, Desmodium cuspidatum

  • Krissa A. Skogen
  • Kent E. Holsinger
  • Zoe G. Cardon
Conservation ecology - Original Paper

Abstract

Increased nitrogen (N) deposition, resulting from the combustion of fossil fuels, production of synthetic fertilizers, growth of N2-fixing crops and high-intensity agriculture, is one of the anthropogenic factors most likely to cause global biodiversity changes over the next century. This influence may be especially large in temperate zone forests, which are highly N limited and occur in regions with the highest levels of N deposition. Within these ecosystems, N2-fixing plants, including legumes, may be more sensitive to N deposition than other plant species. Though it has long been recognized that the competitive edge conferred by N2-fixation diminishes with increasing soil N availability, the conservation implications of increased N deposition on native N2-fixers have received less attention. We focus on Desmodium cuspidatum, which has experienced dramatic population losses in the last 30–40 years in the northeastern United States. We explore competition between this regionally threatened legume and a common non-N2-fixing neighbor, Solidago canadensis, across a gradient of N deposition. Our data show that increased N deposition may be detrimental to N2-fixers such as D. cuspidatum in two ways: (1) biomass accumulation in the non-N2-fixer, S. canadensis, responds more strongly to increasing N deposition, and (2) S. canadensis competes strongly for available mineral nitrogen and can assimilate N previously fixed by D. cuspidatum, resulting in D. cuspidatum relying more heavily on energetically expensive N2-fixation when grown with S. canadensis. N deposition may thus reduce or eliminate the competitive advantage of N2-fixing species growing in N-limited ecosystems.

Keywords

Desmodium cuspidatum Solidago canadensis Nitrogen fixation δ15N isotopes Species decline 

Notes

Acknowledgments

We thank G. Likens, R. Chazdon, G. Anderson, P. Templer, P. Herron, N. Wickett, R. Prunier, K. Theiss and J. Carlson for comments on previous drafts of this manuscript and C. Casile for greenhouse assistance with experimental set up and data collection. Special thanks to the following for assistance cleaning belowground biomass samples: J. Budke, C. Casile, C. Fyler, C. Gjerdrum, N. Hax, K. Hill, J. Hill, S. Marty, H. McManus, B. O’Donnell, M. Polihronakis, R. Prunier, F. Reyda, N. Ross, K. Sturgeon, N. Tabak, K. Theiss, N. Tippery, N. Wickett and G. Yanega. This work is part of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the University of Connecticut. Funding was provided by The Center for Conservation and Biodiversity at the University of Connecticut, The National Science Foundation Doctoral Dissertation Improvement Grant (DEB-0608243) and The United States Environmental Protection Agency (EPA) under the Science to Achieve Results Graduate Fellowship Program. EPA has not officially endorsed this publication and the views herein may not reflect the views of the EPA. The authors declare that there is no conflict of interest. The experiment conducted complies with the current laws in the United States.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Krissa A. Skogen
    • 1
    • 2
  • Kent E. Holsinger
    • 2
  • Zoe G. Cardon
    • 3
  1. 1.Division of Plant Science and ConservationChicago Botanic GardenGlencoeUSA
  2. 2.Department of Ecology and Evolutionary Biology, Center for Conservation and BiodiversityUniversity of ConnecticutStorrsUSA
  3. 3.Ecosystems CenterMarine Biological LaboratoryWoods HoleUSA

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