Biological Invasions

, 10:989 | Cite as

Dynamic expansion in recently introduced populations of fire ant parasitoids (Diptera: Phoridae)

  • Edward G. LeBrun
  • Robert M. Plowes
  • Lawrence E. Gilbert
Original Paper

Abstract

Combating invasive species requires a detailed, mechanistic understanding of the manner and speed with which organisms expand their ranges. Biological control efforts provide an opportunity to study the process of species invasions and range expansions under known initial conditions. This study examines the rate, pattern and mechanisms of spread for two populations of the biological control agent Pseudacteon tricuspis, phorid-fly parasitoids of imported fire ants. We employ a trap-based survey method that detects phorid flies in low-density populations, and provides data on abundance. This technique allows us to differentiate between continuous population spread and effective long-distance dispersal and to examine density gradients of phorid flies across the expanding population front. We find that occupied sites in front of the leading edge of continuous populations were common; forming small populations we refer to as satellite populations. Satellite populations are tens of kilometers from the nearest possible source. Wind governs the dynamics of spread in these two central Texas populations. Population edges expanding with the wind exhibited a higher frequency of effective long-distance dispersal than did populations expanding into the wind. This enhanced effective long-distance dispersal rate translated into a five times faster rate of spread for population edges traveling with the wind. This planned invasion shares many characteristics in common with unplanned species invasions including: protracted establishment phase during which densities were below detection thresholds, and slow initial spread immediately after establishment followed by rapid, accelerating spread rates as population sizes grew.

Keywords

Biological control Invasive species Long-distance dispersal Population spread Pseudacteon tricuspis Range expansion Solenopsis invicta Wind dispersal 

References

  1. Bohrer G, Nathan R, Volis S (2005) Effects of long-distance dispersal for metapopulation survival and genetic structure at ecological time and spatial scales. J Ecol 93:1029–1040CrossRefGoogle Scholar
  2. Clark JS, Lewis M, Horvath L (2001) Invasion by extremes: Population spread with variation in dispersal and reproduction. Am Nat 157:537–554PubMedCrossRefGoogle Scholar
  3. Conover WJ (1971) Practical nonparametric statistics. John Wiley & Sons Inc., New YorkGoogle Scholar
  4. Consoli FL, Wuellner CT, Vinson SB et al (2001) Immature development of Pseudacteon tricuspis (Diptera: Phoridae), an endoparasitoid of the red imported fire ant (Hymenoptera: Formicidae). Ann Entomol Soc Am 94:97–109CrossRefGoogle Scholar
  5. Ehler LE (1998) Invasion biology and biological control. Biol Cont 13:127–133CrossRefGoogle Scholar
  6. Feener DH Jr, Jacobs LF, Schmidt JO (1996) Specialized parasitoid attracted to a pheromone of ants. Anim Behav 51:61–66CrossRefGoogle Scholar
  7. Folgarait PJ, Bruzzone OA, Patrock RJW et al (2002) Developmental rates and host specificity for Pseudacteon parasitoids (Diptera: Phoridae) of fire ants (Hymenoptera: Formicidae) in Argentina. J Econ Entomol 95:1151–1158PubMedCrossRefGoogle Scholar
  8. Gilbert LE (1996) Prospects of controlling fire ants with parasitoid flies: the perspective from research based at Brackenridge Field Laboratory. In: Cohen WE (ed) Texas Quail Short Course II. Texas Agricultural Extension Service, Texas A&M University, Kingsville, pp 77–92Google Scholar
  9. Graham LC, Porter SD, Pereira RM et al (2003a) Field releases of the decapitating fly Pseudacteon curvatus (Diptera: Phoridae) for control of imported fire ants (Hymenoptera: Formicidae) in Alabama, Florida, and Tennessee. Fla Entomol 86:334–339CrossRefGoogle Scholar
  10. Graham LCF, Porter SD, Bertagnolli VE (2003b) Phorid flies in Alabama: a tale of two species. J Agric Urban Entomol 20:165–171Google Scholar
  11. Hastings A, Cuddington K, Davies KF et al (2005) The spatial spread of invasions: new developments in theory and evidence. Ecol Lett 8:91–101CrossRefGoogle Scholar
  12. JMP® (2000) JMP Statistics and Graphics Guide, Version 4. SAS Institute Inc., Cary, NCGoogle Scholar
  13. Johnson DM, Liebhold AM, Tobin PC et al (2006) Allee effects and pulsed invasion by the gypsy moth. Nature 444:361–363PubMedCrossRefGoogle Scholar
  14. Kot M, Lewis MA, van den Driessche P (1996) Dispersal data and the spread of invading organisms. Ecology 77:2027–2042CrossRefGoogle Scholar
  15. Liebhold AM, Tobin PC (2006) Growth of newly established alien populations: comparison of North American gypsy moth colonies with invasion theory. Population Ecology 48:253–262CrossRefGoogle Scholar
  16. Morrison LW, Dall’aglio-Holvorcem CG, Gilbert LE (1997) Oviposition behavior and development of Pseudacteon flies (Diptera: Phoridae), parasitoids of Solenopsis fire ants (Hymenoptera: Formicidae). Environ Entomol 26:716–724Google Scholar
  17. Morrison LW, Kawazoe EA, Guerra R et al (1999) Phenology and dispersal in Pseudacteon flies (Diptera: Phoridae), parasitoids of Solenopsis fire ants (Hymenoptera: Formicidae). Ann Entomol Soc Am 92:198–207Google Scholar
  18. Nathan R (2005) Long-distance dispersal research: building a network of yellow brick roads. Divers Distrib 11:125–130CrossRefGoogle Scholar
  19. Nathan R, Sapir N, Trakhtenbrot A et al (2005) Long-distance biological transport processes through the air: can nature’s complexity be unfolded in silico? Divers Distrib 11:131–137CrossRefGoogle Scholar
  20. Neubert MG, Parker IM (2004) Projecting rates of spread for invasive species. Risk Anal 24:817–831PubMedCrossRefGoogle Scholar
  21. Orr MR, Seike SH, Gilbert LE (1997) Foraging ecology and patterns of diversification in dipteran parasitoids of fire ants in south Brazil. Ecol Entomol 22:305–314CrossRefGoogle Scholar
  22. Parmesan C (2006) Ecological and evolutionary responses to recent climate change. Ann Rev Ecol Evol Syst 37:637–669CrossRefGoogle Scholar
  23. Pereira RM, Porter SD (2006) Range expansion of the fire ant decapitating fly, Pseudacteon tricuspis, eight to nine years after releases in North Florida. Fla Entomol 89:536–538CrossRefGoogle Scholar
  24. Phillips BL, Brown GP, Webb JK et al (2006) Invasion and the evolution of speed in toads. Nature 439:803PubMedCrossRefGoogle Scholar
  25. Porter SD (1998) Biology and behavior of Pseudacteon decapitating flies (Diptera: Phoridae) that parasitize Solenopsis fire ants (Hymenoptera: Formicidae). Fla Entomol 81:292–309CrossRefGoogle Scholar
  26. Porter SD, Nogueira de Sá LA, Morrison LW (2004) Establishment and dispersal of the fire ant decapitating fly Pseudacteon tricuspis in North Florida. Biol Cont 29:179–188CrossRefGoogle Scholar
  27. Porter SD, Williams DF, Patterson RS (1997) Rearing the decapitating fly Pseudacteon tricuspis (Diptera: Phoridae) in imported fire ants (Hymenoptera: Formicidae: Solenopsis) from the United States. J Econ Entomol 90:135–138Google Scholar
  28. Shigesada N, Kawasaki K, Takeda Y (1995) Modeling stratified diffusion in biological invasions. Am Nat 146:229–251CrossRefGoogle Scholar
  29. Simmons AD, Thomas CD (2004) Changes in dispersal during species’ range expansions. Am Nat 164:378–395PubMedCrossRefGoogle Scholar
  30. Smith CR, Gilbert LE (2003) Differential attraction of a parasitoid to dead host ants. Fla Entomol 86:479–480CrossRefGoogle Scholar
  31. Suarez AV, Holway DA, Case TJ (2001) Patterns of spread in biological invasions dominated by long-distance jump dispersal: insights from Argentine ants. Proc Natl Acad Sci U S A 98:1095–1100PubMedCrossRefGoogle Scholar
  32. Taylor CM, Hastings A (2005) Allee effects in biological invasions. Ecol Lett 8:895–908CrossRefGoogle Scholar
  33. Thead LG, Vogt JT, Streett DA (2005) Dispersal of the fire ant decapitating fly, Pseudacteon curvatus (Diptera: Phoridae) in Northeast Mississippi. Fla Entomol 88:214–216CrossRefGoogle Scholar
  34. Travis JMJ, Dytham C (2002) Dispersal evolution during invasions. Evol Ecol Res 4:1119–1129Google Scholar
  35. Vazquez RJ, Porter SD, Briano JA (2006) Field release and establishment of the decapitating fly Pseudacteon curvatus on red imported fire ants in Florida. Biocontrol 51:207–216CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Edward G. LeBrun
    • 1
  • Robert M. Plowes
    • 1
  • Lawrence E. Gilbert
    • 1
  1. 1.Section of Integrative Biology, Brackenridge Field LaboratoryUniversity of Texas at AustinAustinUSA

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