Biological Invasions

, Volume 13, Issue 5, pp 1099–1113 | Cite as

Acacialongifolia invasion impacts vegetation structure and regeneration dynamics in open dunes and pine forests

  • Katherine G. Rascher
  • André Große-Stoltenberg
  • Cristina Máguas
  • João Augusto Alves Meira-Neto
  • Christiane Werner
Original Paper


Acacia spp. are among the most serious plant invaders worldwide, and Acacia longifolia specifically causes problems in Portugal. In this study, we evaluated the impacts of A. longifolia invasion on community structure, light climate, plant diversity and regeneration in pine forests and open stabilized dunes in northern and southern Portugal. Having the growth form of a small tree or shrub, between 1 and 8 m tall, A. longifolia tended to dominate the middle stratum of forests and to share dominance in the upper stratum of open dunes. The presence of A. longifolia was associated with a decreased canopy cover in the lower stratum of all studied habitats, and at some sites with a significantly increased leaf area index and reduced light intensity in the understory. Species number and diversity were reduced in some habitats by up to 50% in invaded compared to non-invaded areas. Furthermore, in forest habitats, A. longifolia seedlings were facilitated by proximity to an adult A. longifolia while the establishment and growth of native seedlings was negatively impacted. The replacement of drought tolerant native species by the water spending invader, A. longifolia, may have serious implications for ecosystem functioning, especially during the prolonged drought periods predicted to occur in Portugal in the future.


Acacia Community structure Plant diversity Plant invasion Mediterranean dune ecosystem 



Funding for this project was provided by the Deutsche Forschungsgemeinschaft (TRANSDUNE Project: # WE 2681/3-1) and Fundação para a Ciência e Tecnologia (POCTI/1999/BSE/34689). We also thank the Estabelecimento Prisional de Pinheiro da Cruz for logistical support and allowing the establishment of our field sites and Andreas Vogel for his advice regarding the field methodology.


  1. Almeida JD, Freitas H (2001) The exotic and invasive flora of Portugal. Bot Compl 25:317–327Google Scholar
  2. Almeida JD, Freitas H (2006) Exotic naturalized flora of continental Portugal-A reassessment. Bot Compl 30:117–130Google Scholar
  3. Asner G, Martin R, Knapp D, Kennedy-Bowdoin T (2009) Effects of Morella faya tree invasion on aboveground carbon storage in Hawaii. Biol Invasions 12:447–494Google Scholar
  4. Bohn U, Neuhäusl R, Gollub G, Hettwer C, Neuhäusl Z, Schlüter H, Weber H (2003) Map of the natural vegetation of Europe. Scale 1: 2 500 000. Landwirtschaftsverlag, MünsterGoogle Scholar
  5. Chytrý M, Pysek P, Wild J, Pino J, Maskell LC, Vila M (2009) European map of alien plant invasions based on the quantitative assessment across habitats. Divers Distrib 15:98–107CrossRefGoogle Scholar
  6. Corbin JD, D’Antonio CM (2004) Effects of exotic species on soil nitrogen cycling: implications for restoration. Weed Technol 18:1464–1467CrossRefGoogle Scholar
  7. Costa JC, Aguiar C, Capelo JH, Lousã M, Neto C (1998) Biogeografia de Portugal continental. Quercetea 0:5–56Google Scholar
  8. Costello DA, Lunt ID, Williams JE (2000) Effects of invasion by the indigenous shrub Acacia sophorae on plant composition of coastal grasslands in south-eastern Australia. Biol Conserv 96:113–121CrossRefGoogle Scholar
  9. Ehrenfeld JG (2003) Effects of exotic plant invasions on soil nutrient cycling processes. Ecosystems 6:503–523CrossRefGoogle Scholar
  10. El-Keblawy A, Al-Rawai A (2007) Impacts of the invasive exotic Prosopis juliflora (Sw.) D.C. on the native flora and soils of the UAE. Plant Ecol 190:23–35CrossRefGoogle Scholar
  11. Emms J, Virtue JG, Preston C, Bellotti WD (2005) Legumes in temperate Australia: a survey of naturalisation and impact in natural ecosystems. Biol Conserv 125:323–333CrossRefGoogle Scholar
  12. Frazer GW, Canham CD, Lertzman KP (1999). Gap Light Analyzer (GLA), Version 2.0: Imaging software to extract canopy structure and gap light transmission indices from true-colour fisheye photographs, users manual and program documentation. Simon Fraser University, Burnaby, British Columbia, and the Institute of Ecosystem Studies, Millbrook, New YorkGoogle Scholar
  13. Gasso N, Sol D, Pino J et al (2009) Exploring species attributes and site characteristics to assess plant invasions in Spain. Divers Distrib 15:50–58CrossRefGoogle Scholar
  14. Gritti ES, Smith B, Sykes MT (2006) Vulnerability of Mediterranean Basin ecosystems to climate change and invasion by exotic plant species. J Biogeogr 33:145–157CrossRefGoogle Scholar
  15. Haysom K, Murphy ST (2003) The status of invasiveness of forest tree species outside their natural habitat: a global review and discussion paper. FAO Forest health and biosecurity working paper, Rome, No. FBS/3EGoogle Scholar
  16. Hellmann C, Sutter R, Rascher KG, Máguas C, Correia O, Werner C (2011) Impact of an exotic N2-fixing Acacia on composition and N status of a native Mediterranean community. Acta Oecol 37:43–50. doi: 10.1016/j.actao.2010.11.005 Google Scholar
  17. Holmes PM, Cowling RM (1997) The effects of invasion by Acacia saligna on the guild structure and regeneration capabilities of South African fynbos shrublands. J Appl Ecol 34:317–332CrossRefGoogle Scholar
  18. Honrado J, Pereira R, Araújo R, Alves PC, Santos G, Matos J, Alves HN, Sousa Pinto I, Caldas FB (2002) Classification and mapping of terrestrial and intertidal vegetation in the Atlantic Coast of Northern Portugal. Littoral 2002. The changing coast. EUROCOAST/EUCC, Porto Portugal, pp 211–215Google Scholar
  19. ICN (2006) Plano Sectorial da Rede Natura 2000. Instituto da Conservacão de Natureza (ICN), LisbonGoogle Scholar
  20. IPCC (2007) Climate change 2007: the physical science basis. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M and Miller HL (eds) Contribution of working group I to the fourth assessment report of the intergovernmental panel on climate change. Cambridge University Press, CambridgeGoogle Scholar
  21. Kent M, Coker P (1992) Vegetation description and analysis. a practical approach, Wiley, New YorkGoogle Scholar
  22. Kramer H, Akca A (2002) Leitfaden zur Waldmesslehre. 4. Aufl. J.D. Sauerländers’s Verlag, Frankfurt Main, Germany, pp 29–31Google Scholar
  23. Lambdon PW, Pysek P, Basnou C et al (2008) Alien flora of Europe: species diversity, temporal trends, geographical patterns and research needs. Preslia 80:101–149Google Scholar
  24. Marchante H, Marchante E, Freitas H (2003) Invasion of the Portuguese dune ecosystems by the exotic species Acacia longifolia (Andrews) Willd.: effects at the community level. In: Child LE, Brock JH, Brundu G et al (eds) Plant invasions: Ecological threats and management solutions. Backhuys, Leiden, pp 75–85Google Scholar
  25. Marchante H, Marchante E, Buscardo E, Maia J, Freitas H (2004) Recovery potential of dune ecosystems invaded by an exotic Acacia species (Acacia longifolia). Weed Technol 18:1427–1433CrossRefGoogle Scholar
  26. Marchante E, Kjøller A, Struwe S, Freitas H (2008a) Invasive Acacia longifolia induce changes in the microbial catabolic diversity of sand dunes. Soil Biol Biochem 40:2563–2568CrossRefGoogle Scholar
  27. Marchante E, Kjøller A, Struwe S, Freitas H (2008b) Short- and long-term impacts of Acacia longifolia invasion on the belowground processes of a Mediterranean coastal dune ecosystem. Appl Soil Ecol 40:210–217CrossRefGoogle Scholar
  28. Marchante E, Kjøller A, Struwe S, Freitas H (2009) Soil recovery after removal of the N2-fixing invasive Acacia longifolia: consequences for ecosystem restoration. Biol Invasion 11:813–823CrossRefGoogle Scholar
  29. Medail F, Quezel P (1997) Hot-Spots analysis for conservation of plant biodiversity in the Mediterranean basin. Ann Mo Bot Gard 84:112–127CrossRefGoogle Scholar
  30. Muyt A (2001) Bush invaders of south-east Australia: a guide to the identification and control of environmental weeds in south-east Australia. R.G. and F.J. Richardson, Meredith, AustraliaGoogle Scholar
  31. Osunkoya OO, Othman FE, Kahar RS (2005) Growth and competition between seedlings of an invasive plantation tree, Acacia mangium, and those of a native Borneo heath-forest species, Melastoma beccarianum. Ecol Res 20:205–214CrossRefGoogle Scholar
  32. Peperkorn R, Werner C, Beyschlag W (2005) Phenotypic plasticity of an invasive Acacia versus two native Mediterranean species. Funct Plant Biol 32:933–944CrossRefGoogle Scholar
  33. Pieterse PJ, Cairns ALP (1986) The effect of fire on an Acacia longifolia seed bank in the south-western Cape. S Afr J Bot 52:233–236Google Scholar
  34. Rascher KG, Máguas C, Correia O, Werner C (2009) Tracing seasonal changes in water use of an invasive Acacia and a native pine in southern portugal by measurement of sap flow. Acta Hort 846:209–216Google Scholar
  35. Rascher KG, Máguas C, Werner C (2010) On the use of phloem sap δ13C as a proxy for canopy carbon assimilation. Tree Phys 30:1499–1514. doi: 10.1093/treephys/tpq092 Google Scholar
  36. Rejmanek M, Richardson DM, Pysek P (2005) Plant invasions and invasibility of plant communities. In: Van der Maarel E (ed) Vegetation ecology. Blackwell, Oxford, pp 332–355Google Scholar
  37. Richardson DM, Macdonald IAW, Holmes PM, Cowling RM (1992) Plant and animal invasions. In: Cowling RM (ed) The ecology of fynbos: nutrients, fire and diversity. Oxford University Press, Cape Town, pp 271–308Google Scholar
  38. Rivas-Martínez S, Díaz TE, Fernández-Gonzalez F, Izco J, Loidi J, Lousa M, Penas A (2002) Vascular plant communities of Spain and Portugal. Addenda to the Syntaxonomical Checklist of 2001. Itinera Geobot 15:5–922Google Scholar
  39. Rodríguez-Echeverría S, Crisostomo JA, Nabais C, Freitas H (2009) Belowground mutualists and the invasive ability of Acacia longifolia in coastal dunes of Portugal. Biol Invasions 11:651–661CrossRefGoogle Scholar
  40. Smith T, Huston M (1989) A theory of the spatial and temporal dynamics of plant communities. Vegetatio 83:49–69CrossRefGoogle Scholar
  41. R Development Core Team (2008) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0,
  42. Thuiller W, Richardson DM, Pysek P, Midgley GF, Hughes GO, Rouget M (2005) Niche-based modelling as a tool for predicting the risk of alien plant invasions at a global scale. Global Change Biol 11:2234–2250CrossRefGoogle Scholar
  43. Van Wilgen BW, Richardson DM (1985) The effects of alien shrub invasions on vegetation structure and fire behaviour in South African fynbos shrublands: a simulation study. J Appl Ecol 22:955–966CrossRefGoogle Scholar
  44. Van Wilgen BW, Richardson DM, Le Maitre DC, Marais C, Magadlela D (2001) The economic consequences of alien plan invasions: examples of impacts and approaches to sustainable management in South Africa. Environ Dev Sustain 3:145–168CrossRefGoogle Scholar
  45. Werner C, Correia O (1996) Photoinhibition in cork-oak leaves under stress: influence of bark-stripping on the chlorophyll fluorescence emission in Quercus suber L. Trees 10:288–292Google Scholar
  46. Werner C, Correia O, Beyschlag W (1999) Two different strategies of Mediterranean macchia plants to avoid photoinhibitory damage by excessive radiation levels during summer drought. Acta Oecol 20:15–23CrossRefGoogle Scholar
  47. Werner C, Ryel RJ, Correia O, Beyschlag W (2001) Structural and functional variability within the canopy and its relevance for carbon gain and stress avoidance. Acta Oecol 22:129–138CrossRefGoogle Scholar
  48. Werner C, Correia O, Beyschlag W (2002) Characteristic patterns of chronic and dynamic photoinhibition of different functional groups in a Mediterranean ecosystem. Funct Plant Biol 29:999–1011CrossRefGoogle Scholar
  49. Werner C, Zumkier U, Beyschlag W, Máguas C (2010) High competitiveness of a resource demanding Acacia under low resource supply. Plant Ecol 206:83–96. doi: 10.1007/s11258-009-9625-0 Google Scholar
  50. Yelenik SG, Stock WD, Richardson DM (2004) Ecosystem level impacts of invasive Acacia saligna in the South African fynbos. Restor Ecol 12:44–51CrossRefGoogle Scholar
  51. Yelenik SG, Stock WD, Richardson DM (2007) Functional group identity does not predict invader impacts: differential effects of nitrogen-fixing exotic plants on ecosystem function. Biol Invasions 9:117–125CrossRefGoogle Scholar
  52. Zenni RD, Wilson JRU, Le Roux JJ, Richardson DM (2009) Evaluating the invasiveness of Acacia paradoxa in South Africa. S Afr J Bot 75:485–496CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Katherine G. Rascher
    • 1
  • André Große-Stoltenberg
    • 2
  • Cristina Máguas
    • 3
  • João Augusto Alves Meira-Neto
    • 3
  • Christiane Werner
    • 1
  1. 1.Experimental and Systems EcologyUniversity of BielefeldBielefeldGermany
  2. 2.Institute of Landscape EcologyUniversity of MünsterMünsterGermany
  3. 3.Environmental Biology Research Center (CBA)University of LisbonLisbonPortugal

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