Biodiversity & Conservation

, Volume 8, Issue 9, pp 1281–1294 | Cite as

Alien grasses in Brazilian savannas: a threat to the biodiversity

  • Vânia Regina Pivello
  • Cláudia Nagako Shida
  • Sérgio Tadeu Meirelles

Abstract

African grasses used as forage are spreading fast in cerrado (Brazilian savanna) patches, probably displacing native species. An analysis of the graminoid species abundance was performed in Cerrado Pé-de-Gigante Reserve (São Paulo State, Brazil), where their relative frequency, density, dominance and the value of importance were assessed in two cerrado forms: cerrado sensu stricto (denser) and campo cerrado (open). Thirty-six transects were determined, along which 3240.5 m × 0.5 m herbaceous samples were taken. Ordination by CCA analysis was performed to detect gradients in the graminoid species distribution, according to shading, distance from the reserve border and aspect. Interspecific associations among the species were tested. A total of 93 species were sampled, predominantly Poaceae and Myrtaceae families. Two alien grasses were found, Melinis minutiflora and Brachiaria decumbens, with very high values of importance. Light availability proved to be the most important analyzed environmental factor related to graminoid distribution, strongly correlated with the abundance of M. minutiflora. Both alien grasses were negatively associated with most native graminoids, suggesting they exert a strong competitive pressure on the native herbaceous community. Attention must be taken to the introduction of alien species in the country.

African grasses biological invasion Brazilian savanna cerrado edge effect 

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References

  1. Batalha MA (1997) Análise da vegetação da ARIE Cerrado Pé-de-Gigante (Santa Rita do Passa Quatro, SP). MSc thesis, Universidade de São Paulo, São PauloGoogle Scholar
  2. Carmona R, Camilo MGB and Martins CR (1997) Estímulo à germinação em sementes de Gymnopogon doellii – uma gramínea ameaçada de extinção. Revista Brasileira de Fisiologia Vegetal 9: 125–130Google Scholar
  3. Coutinho LM (1982a) Ecological effects of fire in Brazilian cerrado. In: Huntley BJ and Walker BH (eds) Ecology of Tropical Savannas, pp 273–291. Springer-Verlag, BerlinGoogle Scholar
  4. Coutinho LM (1982b) Aspectos ecológicos da saÚva no cerrado – os murundus de terra, as características psamofíticas das espécies de sua vegetação e a sua invasão pelo capim gordura. Revista Brasileira de Biologia 42: 147–153Google Scholar
  5. Coutinho LM (1978) O conceito de cerrado. Revista Brasileira de Botânica São Paulo 1: 115–117Google Scholar
  6. Coutinho LM and Hashimoto F (1971) Sobre o efeito inibitório da germinação de sementes produzido por folhas de Calea cuneifolia DC. Ciência e Cultura São Paulo 23: 759–764Google Scholar
  7. Cronk QC and Fuller JL (1995) Plant Invaders. Chapman and Hall, LondonGoogle Scholar
  8. D'Antonio CM and PM Vitousek (1992) Biological invasions by alien grasses, the grass/fire cycle and global change. Annual Review of Ecology and Systematics 23: 63–87Google Scholar
  9. Eiten G (1972) The cerrado vegetation of Brazil. The Botanical Review 38: 201–341Google Scholar
  10. Eiten G (1983) Classificação da Vegetação do Brasil. Brasília: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Google Scholar
  11. Filgueiras TS (1991) A floristic analysis of the gramineae of Brazil's Distrito Federal and a list of the species occurring in the area. Edinburgh Journal of Botany 48: 73–80Google Scholar
  12. Filgueiras TS (1990) Africanas no Brasil: gramíneas introduzidas da África. Cad. Geociências, Rio de Janeiro 5: 57–63Google Scholar
  13. Goodland R and Ferri MG (1979) Ecologia do Cerrado. EDUSP/Itatiaia, São PauloGoogle Scholar
  14. Groves RH and Burden JJ (1986) Ecology of Biological Invasions. Cambridge University Press, CambridgeGoogle Scholar
  15. Heringer EP, Barroso GM, Rizzo JA and Rizzini CT (1977) A flora do cerrado. In: Ferri MG (ed) IV Simpósio sobre o Cerrado, pp 211–232. Itatiaia, Belo HorizonteGoogle Scholar
  16. Hobbs RJ and Humphries SE (1995) An integrated approach to the ecology and management of plant invasions. Conservation Biology 9: 761–768Google Scholar
  17. Houston DB and Schreiner EG (1995) Alien species in national parks: drawing lines in space and time. Conservation Biology 9: 204–209Google Scholar
  18. Klink CA (1996a) Germination and seedling establishment of two native and one invading African species in the Brazilian cerrado. Journal of Tropical Ecology 12: 139–147Google Scholar
  19. Klink CA (1996b) Competition between the African grass Andropogon gayanus Kunth and the native cerrado grass Schizachyrium tenerum Nees. Revista Brasileira de Botânica São Paulo 19: 11–15Google Scholar
  20. Klink CA and Joly CA (1989) Identification and distribution of C3 and C4 grasses in open and shaded habitats in São Paulo State, Brazil. Biotropica 21: 30–34Google Scholar
  21. Lonsdale WM(1994) Inviting trouble: introduced pasture species in Northern Australia. Australian Journal of Ecology 19: 345–354Google Scholar
  22. Ludwig JA and Reynolds JF (1988) Statistical Ecolology: A Primer on Methods and Computing. John Wiley-Interscience, New YorkGoogle Scholar
  23. Mantovani W (1983) Composição e similaridade florística, fenologia e espectro biológico do cerrado da Reserva Biológica de Mogi-Guaçu, estado de São Paulo. MSc thesis, Campinas, UNICAMPGoogle Scholar
  24. Mesquita Junior HN (1998) Análise temporal com sensor orbital de unidades fisionômicas de cerrado no Gleba Pé-de-Gigante (Parque Estadual de Vassununga – SP). MSc thesis, Universidade de São Paulo, São PauloGoogle Scholar
  25. Mueller-Dombois D and Ellenberg H (1974) Aims and Methods of Vegetation Ecology. John Wiley, New YorkGoogle Scholar
  26. Oliveira JB, Prado H and Almeida CLF (1982) Levantamento Pedológico Semidetalhado do Estado de São Paulo (Escala 1:100.000), Quadrícula de Descalvado. Folha SF. 23-V-C-IV. Rio de Janeiro: EMBRAPA/SAA/CPA/IACGoogle Scholar
  27. Peretti JH (1998) Nativism and Nature: Rethinking Biological Invasion. Environmental Values, 7: 183–192Google Scholar
  28. Pivello VR (1992) An expert system for the use of prescribed fires in the management of Brazilian savannas. PhD thesis, Imperial College of Science, Technology and Medicine, University of London, Silwood ParkGoogle Scholar
  29. Pivello VR, Carvalho VMC, Lopes PF, Peccinini AA and Rosso S (1999) Abundance and distribution of native and alien grasses in a 'cerrado' (Brazilian savanna) biological reserve. Biotropica 31 (in press)Google Scholar
  30. Pysek P, Prach K, Rejmánek M and Wade M (1995) Plant Invasions. SPB Academic Publishers, AmsterdamGoogle Scholar
  31. Ter Braak CJF (1991) CANOCO – A FORTRAN program for canonical community ordination by [partial] [detrended] [canonical] correlation analysis, principal component analysis and redundancy analysis (version 3.12). Microcomputer Power, New YorkGoogle Scholar
  32. SPSS (1996) SPSS for Windows (version 7.5). SPSS Inc., USAGoogle Scholar
  33. Walter H (1986) Vegetação e Zonas Climáticas. EPU/EDUSP, São PauloGoogle Scholar
  34. Williamson M (1996) Biological Invasions. Chapman & Hall, LondonGoogle Scholar
  35. ZÚniga MCP (1985) A complexa tarefa de manejar pastagens. Informe Agropecuário 11: 19–23Google Scholar

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Vânia Regina Pivello
    • 1
  • Cláudia Nagako Shida
    • 1
  • Sérgio Tadeu Meirelles
    • 1
  1. 1.Departamento de Ecologia, Instituto de BiociênciasUniversidade de São Paulo, Rua do MatãoSão PauloBrazil

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