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Biological Invasions

, Volume 15, Issue 7, pp 1459–1469 | Cite as

Propagule pressure as a driver of establishment success in deliberately introduced exotic species: fact or artefact?

  • Tim M. Blackburn
  • Thomas A. A. Prowse
  • Julie L. Lockwood
  • Phillip Cassey
Original Paper

Abstract

A central paradigm in invasion biology is that more releases of higher numbers of individuals increase the likelihood that an exotic population successfully establishes and persists. Recently, however, it has been suggested that, in cases where the data are sourced from historical records of purposefully released species, the direction of causality is reversed, and that initial success leads to higher numbers being released. Here, we explore the implications of this alternative hypothesis, and derive six a priori predictions from it. We test these predictions using data on Acclimatization Society introductions of passerine bird species to New Zealand, which have previously been used to support both hypotheses for the direction of causality. All our predictions are falsified. This study reaffirms that the conventional paradigm in invasion biology is indeed the correct one for New Zealand passerine bird introductions, for which numbers released determine establishment success. Our predictions are not restricted to this fauna, however, and we keenly anticipate their application to other suitable datasets.

Keywords

Acclimatization Society Establishment success New Zealand Passerine birds Persistence time Propagule pressure 

Notes

Acknowledgments

We thank Stuart Pimm for discussions that led to many of the ideas in this manuscript, Jason Sadowski for collating the data presented in Fig. 1, and two anonymous referees for comments on an earlier version of this work. TMB was supported by funding from the King Saud University Distinguished Scientist Fellowship Programme. P.C. is an ARC Future Fellow (FT0991420).

References

  1. Beirne BP (1975) Biological control attempts by introduction against pest insects in the field in Canada. Can Entomol 107:225–236CrossRefGoogle Scholar
  2. Blackburn TM, Lockwood JL, Cassey P (2009) Avian invasions. The ecology and evolution of exotic birds. Oxford University Press, OxfordCrossRefGoogle Scholar
  3. Blackburn TM, Prowse TAA, Lockwood JL, Cassey P (2011) Passerine introductions to New Zealand support a positive effect of propagule pressure on establishment success. Biodiver Conserv 20:2189–2199CrossRefGoogle Scholar
  4. Cassey P (2001) Determining variation in the success of New Zealand land birds. Global Ecol Biogeogr 10:161–172CrossRefGoogle Scholar
  5. Caughley G, Gunn A (1996) Conservation biology in theory and practice. Blackwell Science, OxfordGoogle Scholar
  6. Colautti RI, Grigorovich IA, MacIsaac HJ (2006) Propagule pressure: a null model for biological invasions. Biol Inv 8:1023–1037CrossRefGoogle Scholar
  7. Diamond J (1986) Overview: laboratory experiments, field experiments, and natural experiments. In: Diamond J, Case TJ (eds) Community ecology. Harper Row, New York, pp 3–22Google Scholar
  8. Duncan RP (1997) The role of competition and introduction effort in the success of passeriform birds introduced to New Zealand. Am Nat 149:903–915PubMedCrossRefGoogle Scholar
  9. Duncan RP, Blackburn TM (2002) Morphological over-dispersion in game birds (Aves: Galliformes) successfully introduced to New Zealand was not caused by interspecific competition. Evol Ecol Res 4:551–561Google Scholar
  10. Duncan RP, Forsyth DM (2006) Competition and the assembly of introduced bird communities. In: Cadotte MW, McMahon SM, Fukami T (eds) Conceptual ecology and invasions biology. Springer, UK, pp 415–431Google Scholar
  11. Duncan RP, Blackburn TM, Sol D (2003) The ecology of bird introductions. Annu Rev Ecol Evol Syst 34:71–98CrossRefGoogle Scholar
  12. Duncan RP, Blackburn TM, Cassey P (2006) Factors affecting the release, establishment and spread of introduced birds in New Zealand. In: Allen RB, Lee WG (eds) Biological invasions in New Zealand. Springer, Berlin, pp 137–154CrossRefGoogle Scholar
  13. Forsyth DM, Duncan RP (2001) Propagule size and the relative success of exotic ungulate and bird introductions to New Zealand. Am Nat 157:583–595PubMedCrossRefGoogle Scholar
  14. Green RE (1997) The influence of numbers released on the outcome of attempts to introduce exotic birdspecies to New Zealand. J Anim Ecol 66:25–35CrossRefGoogle Scholar
  15. Hayes KR, Barry SC (2008) Are there consistent predictors of invasion success? Biol Inv 10:483–506CrossRefGoogle Scholar
  16. Hopper KR, Roush RT (1993) Mate finding, dispersal, number released, and the success of biological control introductions. Ecol Entomol 18:321–331CrossRefGoogle Scholar
  17. Johnston EL, Piola RF, Clark GF (2009) The role of propagule pressure in invasion success. Ecol Stud 204:133–151CrossRefGoogle Scholar
  18. Legendre S, Clobert J, Møller AP, Sorci G (1999) Demographic stochasticity and social mating system in the process of extinction of small populations: the case of passerines introduced to New Zealand. Am Nat 153:449–463CrossRefGoogle Scholar
  19. Lockwood JL, Cassey P, Blackburn T (2005) The role of propagule pressure in explaining species invasion. Trends Ecol Evol 20:223–228PubMedCrossRefGoogle Scholar
  20. Marchetti MP, Moyle PB, Levine R (2004) Alien fishes in California watersheds: characteristics of successful and failed invaders. Ecol Appl 14:587–596CrossRefGoogle Scholar
  21. Memmott J, Craze PG, Harman HM, Syrett P, Fowler SV (2005) The effect of propagule size on the invasion of an alien insect. J Anim Ecol 74:50–62CrossRefGoogle Scholar
  22. Moulton MP, Sanderson JG, Labisky RF (2001) Patterns of success in game bird (Aves: Galliformes) introductions to the Hawaiian islands and New Zealand. Evol Ecol Res 3:507–519Google Scholar
  23. Moulton MP, Cropper WP Jr, Avery ML, Moulton LE (2010) The earliest house sparrow introductions to North America. Biol Inv 12:2955–2958CrossRefGoogle Scholar
  24. Moulton MP, Cropper WP Jr, Avery ML (2011) A reassessment of the role of propagule pressure in influencing fates of passerine introductions to New Zealand. Biodiver Conserv 20:607–623CrossRefGoogle Scholar
  25. Moulton MP, Cropper WP Jr, Avery ML (2012a) Historical records of passerine introductions to New Zealand fail to support the propagule pressure hypothesis. Biodiver Conserv 21:297–307CrossRefGoogle Scholar
  26. Moulton MP, Cropper WP Jr, Moulton LE, Avery ML, Peacock D (2012b) A reassessment of historical records of avian introductions to Australia: no case for propagule pressure. Biodiver Conserv 21:155–174CrossRefGoogle Scholar
  27. Moulton MP, Cropper WP Jr, Avery ML (2013) Is propagule size the critical factor in predicting introduction outcomes in passeriform birds? Biol Inv. doi: 10.1007/s10530-012-0383-x
  28. Primack RB (2012) A primer of conservation biology. Sinauer Associates, SunderlandGoogle Scholar
  29. Pullin AS (2002) Conservation biology. Cambridge University Press, CambridgeCrossRefGoogle Scholar
  30. R_Development_Core_Team (2006) R: a language and environment for statistical computing. R Foundation for Statistical Computing, ViennaGoogle Scholar
  31. Simberloff D (2009) The role of propagule pressure in biological invasions. Ann Rev Ecol Evol Syst 40:81–102CrossRefGoogle Scholar
  32. Sol D (2000) Are islands more susceptible to be invaded than continents? Birds say no. Ecography 23:687–692CrossRefGoogle Scholar
  33. Sol D, Lefebvre L (2000) Behavioural flexibility predicts invasion success in birds introduced to New Zealand. Oikos 90:599–605CrossRefGoogle Scholar
  34. Sorci G, Møller AP, Clobert J (1998) Plumage dichromatism of birds predicts introduction success in New Zealand. J Anim Ecol 67:263–269CrossRefGoogle Scholar
  35. Soulé ME (1987) Viable populations for conservation. Cambridge University Press, CambridgeCrossRefGoogle Scholar
  36. Tingley R, Phillips BL, Shine R (2011) Establishment success of introduced amphibians increases in the presence of congeneric species. Am Nat 177:382–388PubMedCrossRefGoogle Scholar
  37. Veltman CJ, Nee S, Crawley MJ (1996) Correlates of introduction success in exotic New Zealand birds. Am Nat 147:542–557CrossRefGoogle Scholar
  38. Von Holle B, Simberloff D (2005) Ecological resistance to biological invasion overwhelmed by propagule pressure. Ecology 86:3212–3218CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Tim M. Blackburn
    • 1
    • 2
  • Thomas A. A. Prowse
    • 3
  • Julie L. Lockwood
    • 4
  • Phillip Cassey
    • 3
  1. 1.Institute of ZoologyZSLLondonUK
  2. 2.Distinguished Scientist Fellowship ProgramKing Saud UniversityRiyadhSaudi Arabia
  3. 3.School of Earth and Environmental SciencesUniversity of AdelaideAdelaideAustralia
  4. 4.Ecology, Evolution, and Natural ResourcesRutgers UniversityNew BrunswickUSA

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