Conservation implications of a long-term decline in body condition of the Brothers Island tuatara (Sphenodon guntheri)

Animal Conservation

Volumn 9, Issue 4, 2006, Pages 456-462

  Hoare, Joanne M ^a   Pledger, S ^a   Keall, S N ^a   Nelson, N J ^a   Mitchell, N J ^a,b   Daugherty, C H ^a  

^a VICTORIA UNIVERSITY OF WELLINGTON   (New Zealand)

^b UNIVERSITY OF WESTERN AUSTRALIA   (Australia)

Author keywords

Density dependence; Habitat modification; Reptile; Resource limitation; Sex ratio; Translocation

Indexed keywords

CONSERVATION MANAGEMENT; DENSITY DEPENDENCE; HABITAT RESTORATION; NINETEENTH CENTURY; POPULATION SIZE; REPTILE; SEX RATIO; TRANSLOCATION;

AUSTRALASIA; NEW ZEALAND;

REPTILIA; SPHENODON GUNTHERI; SPHENODON PUNCTATUS;

EID: 33750166095     PISSN: 13679430     EISSN: 14691795     Source Type: Journal    
DOI: 10.1111/j.1469-1795.2006.00061.x     Document Type: Article

References (53)

1. Aitkin, N., Hay, J.M., Sarre, S.D., Lambert, D.M. & Daugherty, C.H. (2001). Microsatellite DNA markers for tuatara (Sphenodon spp.). Conserv. Genet. 2, 183-185.
2. Badyaev, A.V. (2002). Growing apart: An ontogenetic perspective on the evolution of sexual size dimorphism. TREE 17, 369-378.
3. Benton, M.J. (2000). Vertebrate palaeontology. 2nd edn. London: Blackwell Science.
4. Bonnet, X. & Naulleau, G. (1994). A body condition index (BCI) in snakes to study reproduction. C. R. Acad. Sci. III-Vie 317, 34-41.
5. Bradshaw, C.J.A., Davis, L.S., Lalas, C. & Harcourt, R.G. (2000). Geographic and temporal variation in the condition of pups of the New Zealand fur seal (Arctocephalus forsteri): Evidence for density dependence and differences in the marine environment. J. Zool. (Lond.) 252, 41-51.
6. Buller, W.L. (1877). Notes on the tuatara lizard (Sphenodon punctatus), with a description of a supposed new species. Trans. Proc. N. Z. Inst. 9, 317-325.
7. Case, T.J. & Bolger, D.T. (1991). The role of introduced species in shaping the distribution and abundance of island reptiles. Evol. Ecol. 5, 272-290.
8. Chapple, D.G. & Swain, R. (2002). Distribution of energy reserves in a viviparous skink: Does tail autotomy involve the loss of lipid stores? Austral. Ecol. 27, 565-572.
9. Cree, A. (1994). Low annual reproductive output in female reptiles from New Zealand. N. Z. J. Zool. 21, 351-372.
10. Cree, A. & Butler, D. (1993). Tuatara recovery plan. Wellington: New Zealand Department of Conservation.
11. Cree, A., Daugherty, C.H. & Hay, J.M. (1995). Reproduction of a rare New Zealand reptile, the tuatara Sphenodon punctatus, on rat-free and rat-inhabited islands. Conserv. Biol. 9, 373-383.
12. Cree, A., Daugherty, C.H., Schafer, S.F. & Brown, D. (1991). Nesting and clutch size of tuatara (Sphenodon guntheri) on North Brother Island. Tuatara 31, 9-16.
13. Cree, A., Lyon, G.L., Cartland-Shaw, L. & Tyrrell, C. (1999). Stable carbon isotope ratios as indicators of marine versus terrestrial inputs to the diets of wild and captive tuatara. N. Z. J. Zool. 26, 243-253.
14. Cree, A., Thompson, M.B. & Daugherty, C.H. (1995). Tuatara sex determination. Nature 375, 543.
15. Crook, I.G. (1973). The tuatara, Sphenodon punctatus Gray, on islands with and without populations of the Polynesian rat, Rattus exulans Peale. Proc. N. Z. Ecol. Soc. 20, 115-120.
16. Daugherty, C.H., Cree, A., Hay, J.M. & Thompson, M.B. (1990). Neglected taxonomy and continuing extinctions of tuatara (Sphenodon). Nature 347, 177-179.
17. Daugherty, C.H., Gibbs, G.W. & Hitchmough, R.A. (1993). Mega-island or micro-continent? New Zealand and its fauna. TREE 8, 437-442.
18. Dawbin, W.H. (1982). Tuatara Sphenodon punctatus: Aspects of life history, growth and longevity. In New Zealand herpetology. New Zealand Wildlife Service Occasional publication no. 2: 237-250. Newman, D.G. (Ed.). Wellington: New Zealand Wildlife Service.
19. East, K.T., East, M.R. & Daugherty, C.H. (1995). Ecological restoration and habitat relationships of reptiles on Stephens Island, New Zealand. N. Z. J. Zool. 22, 249-261.
20. Gaze, P. (2001). Tuatara recovery plan 2001-2011. Biodiversity recovery unit. Wellington: New Zealand Department of Conservation.
21. Gibbs, G.W. (1999). Insects at risk. Forest Bird 294, 32-35.
22. Gilham, M.E. (1960). Vegetation of Little Brother Island, Cook Strait, in relation to spray-bearing winds, soil salinity and pH. Trans. Roy. Soc. N. Z. 88, 405-424.
23. Green, A.J. (2001). Mass/length residuals: Measures of body condition or generators of spurious results? Ecology 82, 1473-1483.
24. Halpern, B.S., Gaines, S.D. & Warner, R.R. (2005). Habitat size, recruitment, and longevity as factors limiting population size in stage-structured species. Am. Nat. 165, 82-94.
25. Holmes, E.E. & York, A.E. (2003). Using age structure to detect impacts on threatened populations: A case study with steller sea lions. Conserv. Biol. 17, 1794-1806.
26. IUCN (2004). 2004 IUCN Red List of threatened species. Downloaded on 11 September 2005, http://www.iucnredlist.org.
27. Keall, S.N., Nelson, N.J., Phillpot, P., Pledger, S. & Daugherty, C.H. (2001). Conservation in small places: Reptiles on North Brother Island. N. Z. J. Zool. 28, 367.
28. Le Galliard, J.-F., Fitze, P.S., Ferrière, R. & Clobert, J. (2005). Sex ratio bias, male aggression, and population collapse in lizards. Proc. Natl. Acad. Sci. USA 102, 18231-18236.
29. Markwell, T.J. (1999). Keystone species on New Zealand offshore islands: ecological relationships of seabirds, rats, reptiles and invertebrates on Cook Strait islands. Unpublished PhD thesis, Victoria University of Wellington, Wellington.
30. Merrifield, K. (2001). Conservation management of the Brothers Island tuatara (Sphenodon guntheri): Monitoring the translocated Matiu/Somes Island population. Unpublished MConSci thesis, Victoria University of Wellington, Wellington.
31. Mullan, A.B., Wratt, D.S. & Renwick, J.A. (2001). Transient model scenarios of climate changes for New Zealand. Weather Clim. 21, 3-34.
32. Nelson, N.J. (1998). Conservation of Brothers Island tuatara (Sphenodon guntheri). Unpublished MConSci thesis, Victoria University of Wellington, Wellington.
33. Nelson, N.J., Cree, A., Thompson, M.B., Keall, S.N. & Daugherty, C.H. (2004 a). Temperature-dependent sex determination in tuatara. In Temperature dependent sex determination in vertebrates: 53-58. Valenzuela, N. & Lance, V. (Eds). Washington, DC: Smithsonian Books.
34. Nelson, N.J., Keall, S.N., Brown, D. & Daugherty, C.H. (2002 a). Establishing a new wild population of tuatara (Sphenodon guntheri). Conserv. Biol. 16, 887-894.
35. Nelson, N.J., Keall, S.N., Pledger, S. & Daugherty, C.H. (2002 b). Male-biased sex ratio in a small tuatara population. J. Biogeogr. 29, 633-640.
36. Nelson, N.J., Thompson, M.B., Pledger, S., Keall, S.N. & Daugherty, C.H. (2004 b). Do TSD, sex ratios, and nest characteristics influence the vulnerability of tuatara to global warming? Int. Cong. Ser. 1275, 250-257.
37. Nelson, N.J., Thompson, M.B., Pledger, S., Keall, S.N. & Daugherty, C.H. (2004 c). Egg mass determines hatchling size, and incubation temperature influences post-hatching growth, of tuatara, Sphenodon punctatus. J. Zool. (Lond.) 263, 77-87.
38. Newman, A.K. (1878). Notes on the physiology and anatomy of the tuatara (Sphenodon güntheri). Trans. Proc. N. Z. Inst. 10, 222-239.
39. Newman, D.G. (1982). Tuatara, Sphenodon punctatus, and burrows, Stephens Island. In New Zealand herpetology. New Zealand Wildlife Service Occasional publication no. 2: 213-221. Newman, D.G. (Ed.). Wellington: New Zealand Wildlife Service.
40. Ruffell, J. (2005). The use of translocation in tuatara (Sphenodon spp.) conservation and relationships between the tuatara and the tick Aponomma sphenodonti. Unpublished MSc thesis, University of Auckland, Auckland.
41. Stephens, C. (2004). Plant succession, ecological restoration and the skinks of Stephens Island (Takapourewa). Unpublished MSc thesis, Victoria University of Wellington, Wellington.
42. Thompson, M.B., Daugherty, C.H., Cree, A., French, D.C., Gillingham, J.C. & Barwick, R.E. (1992). Status and longevity of the tuatara, Sphenodon guntheri, and Duvaucel's gecko, Hoplodactylus duvaucelii, on North Brother Island, New Zealand. J. Roy. Soc. N. Z. 22, 123-130.
43. Towns, D.R. (1991). Response of lizard assemblages in the Mercury Islands, New Zealand, to removal of an introduced rodent: The kiore (Rattus exulans). J. Roy. Soc. N. Z. 21, 119-136.
44. Towns, D.R. (2002). Korapuki Island as a case study for restoration of insular ecosystems in New Zealand. J. Biogeogr. 29, 593-607.
45. Towns, D.R. & Broome, K.G. (2003). From small Maria to massive Campbell: Forty years of rat eradications from New Zealand islands. N. Z. J. Zool. 30, 377-398.
46. Towns, D.R. & Daugherty, C.H. (1994). Patterns of range contractions and extinctions in the New Zealand herpetofauna following human colonisation. N. Z. J. Zool. 21, 325-339.
47. Towns, D.R. & Robb, J. (1986). The importance of northern offshore islands as refugia for endangered lizard and frog species. In The offshore islands of Northern New Zealand. Department of Lands and Survey information series no. 16: 197-210. Wright, A.E. & Beaver, R.E. (Eds). Wellington: New Zealand Department of Lands and Survey.
48. Towns, D.R., Simberloff, D. & Atkinson, I.A.E. (1997). Restoration of New Zealand islands: Redressing the effects of introduced species. Pac. Conserv. Biol. 3, 99-124.
49. Tyrrell, C., Cree, A. & Towns, D.R. (2000). Variation in reproduction and condition of northern tuatara (Sphenodon punctatus punctatus) in the presence and absence of kiore. Science for Conservation, Vol. 153. Wellington: Department of Conservation.
50. Veitch, C.R. & Bell, B.D. (1990). Eradication of introduced animals from the islands of New Zealand. In Ecological restoration of New Zealand Islands. Conservation sciences publication no. 2: 137-146. Towns, D.R., Daugherty, C.H. & Atkinson, I.A.E. (Eds). Wellington: New Zealand Department of Conservation.
51. Whitaker, A.H. (1973). Lizard populations on islands with and without Polynesian rats, Rattus exulans (Peale). Proc. N. Z. Ecol. Soc. 20, 121-130.
52. Wikelski, M. & Wrege, P.H. (2000). Niche expansion, body size, and survival in Galápagos marine iguanas. Oecologia 124, 107-115.
53. Wilson, K.-J. (2004). Flight of the huia: Ecology and conservation of New Zealand's frogs, reptiles and mammals. Christchurch: Canterbury University Press.