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Biological Invasions

, Volume 16, Issue 2, pp 269–281 | Cite as

Lack of superiority of invasive over co-occurring native riparian tree seedling species

  • N. González-Muñoz
  • P. Castro-Díez
  • O. Godoy
Original Paper

Abstract

The invasive tree species Acer negundo, Ailanthus altissima, Elaeagnus angustifolia and Robinia pseudoacacia are nowadays spreading in inner Spain riparian forests, where they co-occur with the natives Fraxinus angustifolia, Populus alba and Ulmus minor. In these forests, the natural light and soil moisture conditions are being altered by different human activities, as river channelization and regulation. These new environmental conditions may favor invasive species to the detriment of natives. In order to predict potential shifts of species composition in inner Spain riparian forests, we experimentally compared seedling and sapling performance across the four invasive and the three native mentioned species. Seeds were sown along an experimental gradient with four levels of light (100, 65, 35, 7 % of full irradiance) factorially combined with two levels of soil moisture (61 and 40 % of soil gravimetric water content). We compared plant biomass at the end of the first and second growing seasons, relative growth rates, biomass allocation to roots (RWR), stems (SWR) and leaves (LWR), time to emergence (Temerg) and net assimilation rate per unit of leaf mass (NARm) between origins and across species. Biomass accumulation greatly varied across species. However, invaders did not grow on average more than natives. Under high resource conditions, all species tended to grow more and similarly. Only the native U. minor and the invader A. negundo were not hampered by low moisture and/or low light availabilities. The absence of superiority of invaders over natives suggests that the former will not displace the latter in inner Spain riparian forests. However, human activities promoting shade and drought stress in floodplains may benefit the invasive A. negundo in the long term, as the growth of its seedlings is less declined by these conditions than the growth of the rest of the studied species. Thus, management effort should be focused in monitoring and preventing this species spread.

Keywords

Invasive species Biomass Allocation Relative growth rate Seedling niche 

Notes

Acknowledgments

We acknowledge R. Elvira and the staff of the Alcalá University Botanical Garden for their support to perform this experiment. We thank E. Varas and A. Ballesteros for her valuable help with the plant measurements. We are thankful to J. Levine and E. Mordecai for their comments in previous versions of this work. Funds were provided by the projects CGL2007-61873/BOS, CGL2010-16388/BOS of the Spanish Ministry of Science and Innovation and POII10-0179-4700 of the Junta de Comunidades de Castilla-La Mancha. N.G.M. was supported by a grant of the SMSI (FPI fellowship, BES-2008-002457) and by a grant of Alcalá University. O.G. acknowledges financial support from the Spanish Ministry of Education and Science and Fulbright Commission (FU-2009-0039). We are grateful to the support of the REMEDINAL-2 network (Comunidad de Madrid).

Supplementary material

10530_2013_516_MOESM1_ESM.docx (14 kb)
Supplementary material 1 (DOCX 13 kb)
10530_2013_516_MOESM2_ESM.docx (19 kb)
Supplementary material 2 (DOCX 18 kb)
10530_2013_516_MOESM3_ESM.docx (15 kb)
Supplementary material 3 (DOCX 14 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • N. González-Muñoz
    • 1
  • P. Castro-Díez
    • 1
  • O. Godoy
    • 2
  1. 1.Departamento de EcologíaUniversidad de AlcaláMadridSpain
  2. 2.Department of Ecology, Evolution and Marine BiologyUniversity of CaliforniaSanta BarbaraUSA

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