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RESEARCH ARTICLE
Contents Vol 55(3)

Geographic range, population structure and conservation status of the green python (Morelia viridis), a popular snake in the captive pet trade

David Wilson A B C and Robert Heinsohn A
+ Author Affiliations
- Author Affiliations

A Fenner School of Environment and Society, Australian National University, Canberra, ACT 0200, Australia.

B Present address: School for Tropical and Marine Biology, James Cook University, Townsville 4811, Australia.

C Corresponding author. Email: david.wilson2@jcu.edu.au

Australian Journal of Zoology 55(3) 147-154 https://doi.org/10.1071/ZO06078
Submitted: 12 September 2006  Accepted: 15 May 2007   Published: 28 June 2007

Abstract

Accurate knowledge of distribution and population size is required for effective conservation and management of wild species. Here we report on the first estimates of the distribution and density of the green python (Morelia viridis), an iconic rainforest species widely kept in captivity. We used climatic modelling to predict its distribution in Papua New Guinea, and both climate and vegetation mapping to predict its Australian distribution. We used mark–recapture methods to estimate the density and population structure of green pythons at Iron Range, northern Australia. Bioclimatic analyses suggested that there is extensive climatically suitable habitat in Papua New Guinea (≥200 000 km2), but very little in Australia (~300 km2). However, use of vegetation maps increases the predicted suitable area of occupancy in Australia to 3127 km2, including nine regional ecosystems. Density estimates at Iron Range were 4–5 ha–1 in the complex vine forest regional ecosystem; however, only half of these were mature adults. The large predicted area of occurrence and the high density in the one intensively studied area suggest that the species is not vulnerable to extinction in the short term. However, more studies are needed in both New Guinea and Australia, especially to quantify the impact of harvesting green pythons for the pet trade.


Acknowledgements

We thank all the people who helped search for specimens in the field, especially K. and A. Goetze, S. Legge, S. Murphy, B. Robinson, E. Sobey and K. Wilson. K. Nissen and J. Stein helped to generate maps. This research was funded by the Australian Geographic Society, National Geographic Society and the Hermon Slade Foundation. Appropriate permits were issued by the Queensland Environmental Protection Agency (WITK00337502) and the Australian National University (C.RE.24.02 and 27.02).


References

Barker D., and Barker T. (1994). ‘Pythons of the World. Volume 1. Australia.’ (Advanced Vivarium Systems Inc.: Escondido, CA.)

Brown, G. , and Shine, R. (2002). Influence of weather condition on activity of tropical snakes. Austral Ecology 27, 596–605.
| Crossref | GoogleScholarGoogle Scholar | Cogger H., Cameron E., Sadlier R., and Eggler P. (1994). ‘The Action Plan for Australian Reptiles.’ (Australian Nature Conservation Agency: Canberra.)

Crisp, M. , Laffan, S. , Linder, H. , and Monro, A. (2001). Endemism in the Australian flora. Journal of Biogeography 28, 183–198.
| Crossref | GoogleScholarGoogle Scholar | ESRI (1999). ‘ArcView GIS Version 3.1.1.’ (Environmental Systems Research Institute, Inc.: Redlands, CA.)

Gibbons, J. , and Andrews, K. (2004). PIT tagging: simple technology at its best. Bioscience 54, 447–454.
| Crossref | GoogleScholarGoogle Scholar | Henderson R. (2002). ‘Neotropical Treeboas. Natural History of the Corallus hortolanus Complex.’ (Krieger Publishing Company: Malabar, FL.)

Houlder D., Hutchinson M., Nix H., and McMahon J. (1999). ‘ANUCLIM Version 5.0 User Guide.’ (Centre for Resources and Environmental Studies, Australian National University: Canberra.)

Inskipp T., and Gillett H. (Eds) (2003). ‘Checklist of CITES Species.’ Compiled by UNEP-WCMC. (CITES Secretariat and UNEP-WCMC: Geneva.)

IUCN (2001). ‘IUCN Red List Categories and Criteria: Version 3.1.’ (IUCN Species Survival Commission: Cambridge, UK.)

Kikkawa J., Monteith G., and Ingram G. (1981). Cape York Peninsula: major region of faunal interchange. In ‘Ecological Biogeography of Australia’. (Ed. A. Keast.) pp. 1695–1742. (Dr W. Junk: The Hague.)

Lavarack P., and Godwin M. (1987). Rainforests of northern Cape York Peninsula. In ‘The Rainforest Legacy’. (Eds G. Werren and A. Kershaw.) pp. 201–222. (Australian Government Publishing Service: Canberra.)

Legge, S. , Heinsohn, R. , and Garnett, S. (2004). Availability of nest hollows and breeding population size of eclectus parrots, Eclectus roratus, on Cape York Peninsula Australian Wildlife Research 31, 149–161.
| Crossref | GoogleScholarGoogle Scholar | Mackay B., and Nix H. (2001). ‘The Natural History Significance of Cape York Peninsula. Report for the Queensland Environmental Protection Agency.’ (ANUTECH Pty Ltd: Canberra.)

Mayr E., and Diamond J. (2001). ‘The Birds of Northern Melanesia.’ (Oxford University Press: New York.)

Meyer, C. , and Thuiller, W. (2006). Accuracy of resource selection functions across spatial scales. Diversity & Distributions 12, 288–297.
| Crossref | GoogleScholarGoogle Scholar | Neldner V. (1999). Cape York Peninsula. In ‘The Conservation Status of Queensland’s Bioregional Ecosystems’. (Eds P. Sattler and R. Williams.) pp. 3/1–3/85. (Environmental Protection Agency: Brisbane.)

Nix H. (1986). Biogeographic analysis of the Australian elapid snakes. In ‘Atlas of Elapid Snakes of Australia’. (Ed. R. Longmore.) pp. 4–15. (Australian Government Publishing Service: Canberra.)

Nix H., and Switzer M. (Eds) (1991). ‘Rainforest Animals: Atlas of Vertebrates Endemic to Australia’s Wet Tropics. Kowari 1.’ (Australian Parks and Wildlife Service: Canberra.)

Olsen, P. , and Doran, B. (2002). Climatic modelling of the Australian distribution of the grass owl (Tyto capensis): is there an inland population? Wildlife Research 29, 117–125.
| Crossref | GoogleScholarGoogle Scholar | O’Shea M. (1996). ‘A Guide to the Snakes of Papua New Guinea.’ (Independent Publishing: Port Moresby.)

Paijmans K. (1976). Vegetation. In ‘New Guinea Vegetation’. (Ed. K. Paijmans.) pp. 23–105. (Australian National University Press: Canberra.)

Parker W., and Plummer M. (1987). Population ecology. In ‘Snakes: Ecology and Evolutionary Biology’. (Eds R. Seigel, J. Collins and S. Novak.) pp. 253–301. (Macmillan Publishing Co.: New York.)

Pearson, D. , Shine, R. , and Williams, A. (2005). Spatial ecology of a threatened python (Morelia spilota imbricata) and the effects of anthropogenic habitat change. Austral Ecology 30, 261–274.
| Crossref | GoogleScholarGoogle Scholar | Sattler P., and Williams R. (Eds) (1999). ‘The Conservation Status of Queensland’s Bioregional Ecosystems.’ (Environmental Protection Agency: Brisbane.)

Schulte, R. (1988). Observaciones sobre la boa verde, Corallus caninus, en el Departmento San Martin-Peru. Boletín de Lima 55, 21–26.
Stafford P., and Henderson R. (1996). ‘Kaleidoscopic Tree Boas.’ (Krieger Publishing Company: Malabar, FL.)

Sumner, J. , and Dickman, C. (1998). Distribution and identity of species in the Antechinus stuartii–A. flavipes group (Marsupialia: Dasyuridae) in south-eastern Australia. Australian Journal of Zoology 46, 27–41.
| Crossref | GoogleScholarGoogle Scholar | Webb L., and Tracey J. (1981). Australian rainforests: patterns and change. In ‘Ecological Biogeography of Australia’. (Ed. A. Keast.) pp. 607–694. (Dr W. Junk: The Hague.)

White, G. , and Burnham, K. (1999). Program MARK: survival estimation from populations of marked animals. Bird Study 46S, 120–138.
Wilson D. (2007). Foraging ecology and diet of an ambush predator: the green python Morelia viridis. In ‘Biology of the Boas and Pythons’. (Eds R. Henderson and R. Powell.) pp. 141–150. (Eagle Mountain Publishing: Eagle Mountain, UT.)

Wilson, D. , Heinsohn, R. , and Legge, S. (2006a). Spatial ecology of dichromatic green pythons (Morelia viridis) in Australian tropical rainforests. Austral Ecology 31, 577–587.
| Crossref | GoogleScholarGoogle Scholar |

Wilson, D. , Heinsohn, R. , and Wood, J. (2006b). Life history traits and colour change in the arboreal tropical python Morelia viridis. Journal of Zoology 270, 399–407.
| Crossref | GoogleScholarGoogle Scholar |

Wilson, D. , Heinsohn, R. , and Endler, J. (2007). The adaptive significance of ontogenetic colour change in a tropical python. Biology Letters 3, 40–43.
| Crossref | GoogleScholarGoogle Scholar | PubMed |





Appendix 1.  Details of locations in Papua New Guinea used in the BIOCLIM prediction of the distribution of the green python (Morelia viridis) in Papua New Guinea
A1



Appendix 2.  Details of locations in Australia used in the BIOCLIM prediction of the distribution of the green python (Morelia viridis) in Australia
A2