Abstract
Understanding the response of threatened and functionally important island invertebrate species to plant community restoration is essential for the successful conservation of these invertebrate species. The Seychelles giant millipede (SGM), Sechelleptus seychellarum, is a threatened and functionally important macro-detritivore endemic to the Seychelles granitic islands. Here, we studied the response of this species to the ongoing forest restoration programme on Cousine Island, Seychelles. This study was conducted over an 11 year period, representing the floral succession of a formerly degraded open scrubland area, dominated by alien plants, to a closed canopy forest, dominated by planted indigenous trees. While the time span of this study was insufficient for vegetation height in the restored area to equal that in the reference natural forest, canopy closure was nevertheless comparable. We found SGM density to be an order of magnitude lower in the restored site compared to the natural forest. In contrast, SGM physical condition improved significantly in the restored site, as vegetation structure increased. Furthermore, SGM behaviour in the restored site switched from a predominantly walking to a dominantly feeding behaviour over the study period, resulting in the forest restoration programme on Cousine increasing the foraging area of the SGM by 43 %. Competition for key resources, e.g. food and day-time refuges, are suggested as possible factors limiting SGM numbers in the restored forest.
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References
Baider C, Florens FBV, Baret S, Beaver K, Matatiken D, Strasberg D, Kueffer C (2010) Status of plant conservation on oceanic islands of the Western Indian Ocean. In: Proceedings of the 4th global botanic gardens congress
Gaigher R, Samways MJ, Henwood J, Jolliffe K (2011) Impacts of a mutualism between an invasive ant species and honeydew-producing insects on a functionally important tree on a tropical island. Biol Invasions 13:1717–1721
Gerlach J (2008a) Key biodiversity areas of the Seychelles Islands. Blackhuys, Leiden
Gerlach J (2008b) Preliminary conservation status and needs of an oceanic island fauna: the case of Seychelles insects. J Insect Conserv 12:293–305
Gerlach J, Lawrence JM, Canning L (2005) Mortality, population changes and exceptional behaviour in a giant millipede. Phelsuma 13:86–94
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, UK, pp 387–402
Grimbacher PS, Catterall CP (2007) How much do site age, habitat structure and spatial isolation influence the restoration of rainforest beetle species assemblages? Biol Conserv 135:107–118
Hopkin SP, Read HJ (1992) The biology of millipedes. Oxford University Press, UK
IUCN (2011) Species on the edge of survival. International Union for Conservation and Nature, China
Kadamannaya BS, Sridhar KR (2009) Leaf litter ingestion and assimilation by two endemic pill millipedes (Arthrosphaera). Biol Fert Soils 45:761–768
Kelly JA, Samways MJ (2003) Diversity and conservation of forest-floor arthropods on a small Seychelles island. Biodivers Conserv 12:1793–1813
Knop E, Herzog F, Schmid B (2011) Effect of connectivity between restoration meadows on invertebrates with contrasting dispersal abilities. Restor Ecol 19:151–159
Lawrence JM (1999) Ecology and behaviour of the Seychelles giant millipede. Dissertation. University of Natal, South Africa
Lawrence JM (2009) Habitat restoration and the decline of the African grass blue butterfly, Zizeeria knynsa (Lepidoptera: Lycaenidae) on a small Seychelles island. Metamorphosis 20:131–140
Lawrence JM, Samways MJ (2003) Litter breakdown by the Seychelles giant millipede and the conservation of soil processes on Cousine Island, Seychelles. Biol Conserv 113:125–132
Lawrence JM, Samways MJ, Henwood J, Kelly J (2011) Effect of an invasive ant and its chemical control on a threatened endemic Seychelles millipede. Ecotoxicology 20:731–738
Majer JD (2009) Animals in the restoration process—progressing the trends. Restor Ecol 17:315–319
Moir ML, Brennan KEC, Koch JM, Majer JD, Fletcher MJ (2005) Restoration of a forest ecosystem: the effects of vegetation and dispersal capabilities on the reassembly of plant-dwelling arthropods. Forest Ecol Manag 217:294–306
Myers N, Mittermeier RA, Mittermeier CG, da Fonseca GAB, Kent J (2000) Biodiversity hotspots for conservation priorities. Nature 403:853–858
Nakamura A, Proctor H, Catterall C (2003) Using soil and litter arthropods to assess the state of rainforest restoration. Ecol Manage Restor 104:301–313
Nakamura A, Catterall CP, Kitching RL, House APN, Burwell CJ (2008) Effects of isolation on the colonisation of restored habitat patches by forest-dependent arthropods of soil and litter. Insect Conserv Diver 1:9–21
Nakamura A, Catterall CP, Burwell CJ, Kitching RL, House APN (2009) Effects of shading and mulch depth on the colonisation of habitat patches by arthropods of rainforest soil and litter. Insect Conserv Diver 2:221–231
New TR (2008) Insect conservation on islands: setting the scene and defining the needs. In: New TR (ed) Insect Conservation and Islands. Springer, The Netherlands, pp 3–10
New TR (2009) Insect species conservation. Cambridge University Press, UK
Ramalingam R, Rajan PD (2009) Ground insect community response to habitat restoration efforts in the Attappady hills, Western Ghats, India. Curr Sci India 97:935–941
Reddy MV (1995) Litter arthropods. In: Reddy MV (ed) Soil organisms and litter decomposition in the tropics. Westview Press, UK, pp 113–140
Samways MJ (2000) A conceptual model of ecosystem restoration triage based on experiences from three remote oceanic islands. Biodivers Conserv 9:1073–1083
Samways MJ, Hitchins P, Bourquin O, Henwood J (2010) Tropical island recovery, Cousine Island, Seychelles. Wiley, Oxford
Sayer EJ (2005) Using experimental manipulation to assess the roles of leaf litter in the functioning of forest ecosystems. Biol Rev 80:1–31
Siegel S, Castellan NJ (1988) Nonparametric statistics for the behavioural sciences. McGraw-Hill International Editions, New York
Snyder BA, Hendrix PF (2008) Current and potential roles of soil macroinvertebrates (earthworms, millipedes and isopods) in ecological restoration. Restor Ecol 16:629–636
Walker L, Bellingham P (2011) Island environments in a changing world. Cambridge University Press, UK
Warren MW, Zou X (2002) Soil macrofauna and litter nutrients in three tropical tree plantations on a disturbed site in Puerto Rico. Forest Ecol Manage 170:161–171
Acknowledgments
We would like to thank M.F. Keeley of Cousine Island for the opportunity of making this study and Janine Henwood for logistical support.
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Lawrence, J.M., Samways, M.J., Kelly, J.A. et al. Response of a threatened giant millipede to forest restoration. J Insect Conserv 17, 367–373 (2013). https://doi.org/10.1007/s10841-012-9518-8
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DOI: https://doi.org/10.1007/s10841-012-9518-8