, Volume 20, Issue 4, pp 731–738 | Cite as

Effect of an invasive ant and its chemical control on a threatened endemic Seychelles millipede

  • James M. LawrenceEmail author
  • Michael J. Samways
  • Jock Henwood
  • Janine Kelly


The impact of invasive species on island faunas can be of major local consequence, while their control is an important part of island ecosystem restoration. Among these invasive species are ants, of which some have a disruptive impact on indigenous arthropod populations. Here, we study the impact of the invasive African big-headed ant, Pheidole megacephala, on a small Seychelles island, Cousine, and assess the impact of this ant, and its chemical control, using the commercially available hydramethylnon-based bait, Siege, on the endemic keystone Seychelles giant millipede species, Sechelleptus seychellarum. We found no significant correlations in landscape-scale spatial overlap and abundance between the ant and the millipede. Furthermore, the ant did not attack healthy millipedes, but fed only on dying and dead individuals. The chemical defences of the millipede protected it from ant predation. Ingestion of the bait at standard concentration had no obvious impact on the millipede. The most significant threat to the Seychelles giant millipede in terms of P. megacephala invasion is from possible catastrophic shifts in ecosystem function through ant hemipteran mutualisms which can lead to tree mortality, resulting in alteration of the millipede’s habitat.


Millipede Invasive ant Pheidole megacephala Hydramethylnon Siege Cousine Island Seychelles 



We would like to thank M.F. Keeley of Cousine Island for the opportunity of making this study, Janine Henwood for making the stay on Cousine logistically possible, and two anonymous reviewers for valuable comments.


  1. Anderson JM, Bignell DE (1980) Bacteria in the food, gut contents and faeces of the litter-feeding millipede Glomeris marginata. Soil Biol Biochem 12:251–254CrossRefGoogle Scholar
  2. Bacey J (2000) Environmental fate of hydramethylnon. Department of Pesticide Regulation reportGoogle Scholar
  3. Bach CE (1991) Direct and indirect interactions between ants (Pheidole megacephala), scales (Coccus viridis) and plants (Pluchea indica). Oecologica 87:233–239CrossRefGoogle Scholar
  4. Buckley RC (1987) Interactions involving plants, Homoptera and ants. Annu Rev Entomol 18:111–135Google Scholar
  5. Callan SK, Majer JC (2009) Impacts of an incursion of African big-headed ants, Pheidole megacephala (Fabricius), in urban bushland in Perth, Western Australia. Pac Conserv Biol 15:102–115Google Scholar
  6. Davies MA (2009) Invasion biology. Oxford University Press, OxfordGoogle Scholar
  7. Dejean A, Kenne M, Moreau CS (2007a) Predatory abilities favour the success of the invasive ant Pheidole megacephala in an introduced area. J Appl Entomol 139(9–10):625–629CrossRefGoogle Scholar
  8. Dejean A, Moreau CS, Uzac P, Le Breton J, Kenne M (2007b) The predatory behaviour of Pheidole megacephala. CR Biol 330:701–709CrossRefGoogle Scholar
  9. Diniz JLM, Brandão CRF (1993) Biology and myriapod egg predation by the Neotropical Myrmicine ant Stegomyrmex vizottoi (Hymenoptera: Formicidae). Insect Soc 40:301–311CrossRefGoogle Scholar
  10. Gaigher R, Samways MJ, Henwood J, Jolliffe K (2011) Impacts of a mutualism between an invasive ant and honey-producing insects on a functionally important tree on a tropical island. Biol Invasions. doi: 10.1007/s10530-010-9934-1
  11. Gerlach J (2008) Preliminary conservation status and needs of an oceanic island fauna: the case of Seychelles insects. J Insect Conserv 12:293–305CrossRefGoogle Scholar
  12. Golovatch S, Gerlach J (2010) Class Diplopoda De Blainville in Gervais, 1844. In: Gerlach J, Marusik Y (eds) Arachnida and Myriapoda of the Seychelles islands. Siri Scientific Press, Manchester, pp 387–402Google Scholar
  13. Hanlon RDG (1981) Some factors influencing microbial growth on soil animal faeces. 2. Bacterial and fungal growth on soil animal faeces. Pedobiologia 21:264–270Google Scholar
  14. Hoffmann BD (2010) Ecological restoration following the local eradication of an invasive ant in northern Australia. Biol Invasions 12:959–969CrossRefGoogle Scholar
  15. Hoffmann BD, O’Connor S (2004) Eradication of two exotic ants from Kakadu National Park. Ecol Manag Restor 5(2):98–105CrossRefGoogle Scholar
  16. Hoffmann BD, Kay A, Crocetti S (2004) Pest ant management on Tryon, Northwest, Heron and the Lady Musgrave islands in the Capricornia Cays National Park, Queensland. Report to Queensland Parks and Wildlife Services, CSIRO, DarwinGoogle Scholar
  17. Hölldobler B, Wilson EO (1990) The ants. Belknap Press, CambridgeGoogle Scholar
  18. Hollingshaus GJ (1987) Inhibition of mitochondrial electron transport by hydramethylnon: a new amidinohydrazone insecticide. Pestic Biochem Physiol 27:61–70CrossRefGoogle Scholar
  19. Hopkin SP, Read HJ (1992) The biology of millipedes. Oxford University Press, OxfordGoogle Scholar
  20. Kawakami K, Okochi I (eds) (2010) Restoring the oceanic island ecosystem: impact and management of invasive alien species in the Bonin Islands. Springer, BerlinGoogle Scholar
  21. Krushelnycky PD, Loope LL, Reimer NJ (2005) The ecology, policy and management of ants in Hawaii. Proc Hawaii Entomol Soc 37:1–15Google Scholar
  22. Lawrence RF (1984) The centipedes and millipedes of Southern Africa. A.A Balkema, Cape TownGoogle Scholar
  23. Lawrence JM (1999) Ecology and behaviour of the Seychelles giant millipede. Dissertation, University of Natal, South AfricaGoogle Scholar
  24. Lawrence JM, Samways MJ (2003) Litter breakdown by the Seychelles giant millipede and the conservation of soil processes on Cousine Island, Seychelles. Biol Conserv 113:125–132CrossRefGoogle Scholar
  25. McMonigle O (2005) Giant millipede: the enthusiast’s handbook. Elytra & Antenna, USAGoogle Scholar
  26. Mitchell MA, Tully TN (2009) Manual of exotic pet practice. Saunders Elsevier, ChinaGoogle Scholar
  27. Myers N, Mittermeier RA, Mittermeier CG, da Fonseca GAB, Kent J (2000) Biodiversity hotspots for conservation priorities. Nature 403:853–858CrossRefGoogle Scholar
  28. Nichols BJ, Sites RW (1989) A comparison of arthropod species within and outside the range of Solenopsis invicta Buren in central Texas. Southwest Entomol 14:345–350Google Scholar
  29. O’Dowd DJ, Green PT, Lakes PS (2003) Invasional ‘meltdown’ on an oceanic island. Ecol Lett 6:445–461Google Scholar
  30. Paris CI, Espadaler X (2009) Honeydew collection by the invasive garden ant Lasius neglectus versus the native ant L. grandis. Arthropod–Plant Interact 3:75–85CrossRefGoogle Scholar
  31. Plentovich S, Swenson C, Reimer N, Richardson M, Garon N (2010) The effects of hydramethylnon on the tropical fire ant, Solenopsis geminate (Hymenoptera: Formicidae), and non-target arthropods on Spit Island, Midway Atoll, Hawaii. J Insect Conserv 14(5):459–465CrossRefGoogle Scholar
  32. Porter SD, Savignamo DA (1990) Invasion of polygyne fire ants decimates native ants and disrupts arthropod community. Ecology 71:2095–2106CrossRefGoogle Scholar
  33. Primack RB (2006) Essentials of conservation biology, 4th edn. Sinauer, SunderlandGoogle Scholar
  34. Samways MJ (1983) Asymmetrical competition and amensalism through soil dumping by the ant, Myrmicaria natalensis. Ecol Entomol 8:191–194CrossRefGoogle Scholar
  35. Samways MJ (2000) A conceptual model of ecosystem restoration triage based on experiences from three remote oceanic islands. Biodivers Conserv 9:1073–1083CrossRefGoogle Scholar
  36. Samways MJ (2005) Insect diversity conservation. Cambridge University Press, CambridgeCrossRefGoogle Scholar
  37. Samways MJ, Hitchins PM, Bourquin O, Henwood J (2010a) Restoration of a tropical island: Cousine Island, Seychelles. Biodivers Conserv 19(2):425–434CrossRefGoogle Scholar
  38. Samways MJ, Hitchins P, Bourquin O, Henwood J (2010b) Tropical Island recovery, Cousine Island, Seychelles. Wiley-Blackwell, OxfordGoogle Scholar
  39. Shah NJ (2001) Eradication of alien predators in Seychelles: an example of conservation action on tropical islands. Biodivers Conserv 10:1219–1220CrossRefGoogle Scholar
  40. Shah NJ (2006) Ecological restoration of islands in the Seychelles. Conserv Evid 3:1–2Google Scholar
  41. Siegel S, Castellan NJ (1988) Nonparametric statistics for the behavioral sciences. McGraw-Hill International Editions, New YorkGoogle Scholar
  42. Stanely MC (2004) Review of the efficacy of baits used for ant control and eradication. Landcare Research Contract Report: LC0405/044Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • James M. Lawrence
    • 1
    Email author
  • Michael J. Samways
    • 1
  • Jock Henwood
    • 2
  • Janine Kelly
    • 3
  1. 1.Department of Conservation Ecology and Entomology, Faculty of AgriSciencesStellenbosch UniversityMatielandSouth Africa
  2. 2.Cousine Island, Victoria, MahéSeychelles
  3. 3.Plant Protection InstituteAgricultural Research CouncilQueenswoodSouth Africa

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