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Australian Mammalogy Australian Mammalogy Society
Journal of the Australian Mammal Society
RESEARCH ARTICLE

Using canopy bridges to link habitat for arboreal mammals: successful trials in the Wet Tropics of Queensland

Nigel Weston A B C , Miriam Goosem A , Helene Marsh A , Martin Cohen A and Robyn Wilson A
+ Author Affiliations
- Author Affiliations

A School of Earth and Environmental Sciences, James Cook University, Cairns, Queensland 4878, Australia.

B Current address: Natural Resource Management Board (NT), GPO Box 2775, Darwin, NT 0801, Australia.

C Corresponding author. Email: Nigel.Weston@nrmbnt.org.au

Australian Mammalogy 33(1) 93-105 https://doi.org/10.1071/AM11003
Submitted: 31 January 2011  Accepted: 18 February 2011   Published: 23 March 2011

Abstract

We investigated the use of inexpensive aerial bridges (rope canopy bridges) above roads and a highway by arboreal mammals in the Wet Tropics of Queensland, Australia. Three rope bridge designs were trialed, including a single rope, ladder-like bridges and tunnel-shaped bridges. Nine mammal species were recorded using canopy bridges, including five species or subspecies endemic to the Wet Tropics and three species listed as rare under State nature conservation legislation. Most of these species suffer severely from either the fragmentation or mortality impacts caused by roads. Over 50 crossings above a 15-m-wide tourist road were observed on an elevated ladder-like bridge. Longer (~40 m) rope bridges were used on several occasions by four species. Our observations suggest that canopy bridges can assist rare arboreal mammals to cross roads in the Wet Tropics, thereby reducing both the risk of road-kill and the potential for subpopulation isolation. Further research is required to ascertain the level of benefit afforded by canopy bridges for arboreal mammal populations. It is likely that rope canopy bridges will have broad application for a range of arboreal mammal species.

Additional keywords: canopy gap, Hemibelideus lemuroides, linear barriers, World Heritage Area.


References

Andrews, A. (1990). Fragmentation of habitat by roads and utility corridors: a review. Australian Zoologist 26, 130–141.

Clevenger, A. P., and Savaya, M. A. (2010). Piloting a non-invasive genetic sampling method for evaluating population-level benefits of wildlife crossing structures. Ecology and Society 15, 7.

Clevenger, A. P., and Waltho, N. (2005). Performance indices to identify attributes of highway crossing structures facilitating movement of large mammals. Biological Conservation 121, 453–464.
Performance indices to identify attributes of highway crossing structures facilitating movement of large mammals.Crossref | GoogleScholarGoogle Scholar |

Fahrig, L., and Rytwinski, T. (2009). Effects of roads on animal abundance: an empirical review and synthesis. Ecology and Society 14, 21.

Forman, R. T. T., Sperling, J., Bissonette, J., Clevenger, A. P., Cutshall, C., Dale, V., Fahrig, L., France, R., Goldman, C., Heanue, K., Jones, J., Swanson, F., Turrentine, T., and Winter, T. (2003). ‘Road Ecology: Science and Solutions.’ (Island Press: Washington, DC.)

Goosem, M. W. (1997). Internal fragmentation: the effects of roads, highways and powerline clearings on movements and mortality of rainforest vertebrates. In ‘Tropical Forest Remnants: Ecology, Management and Conservation of Fragmented Communities’. (Eds W. Laurance and R. Bierregaard Jr.) pp. 241–255. (University of Chicago Press: Chicago.)

Goosem, M. (2000a). Impacts of roads and powerline clearings on rainforest vertebrates with emphasis on ground-dwelling small mammals. Ph.D. Thesis, James Cook University, Cairns.

Goosem, M. (2000b). Road crossings by arboreal mammal species questionnaire. In ‘Impacts of Roads and Powerlines on the Wet Tropics World Heritage Area, Stage II, July 2000’. (Eds M. Goosem and S. Turton.) (Rainforest CRC: Cairns.)

Goosem, M. (2002). Effects of tropical rainforest roads on small mammals: fragmentation, edge effects and traffic disturbance. Wildlife Research 29, 277–289.
Effects of tropical rainforest roads on small mammals: fragmentation, edge effects and traffic disturbance.Crossref | GoogleScholarGoogle Scholar |

Goosem, M. (2004). Linear infrastructure in tropical rainforests: mitigating impacts on fauna of roads and powerline clearings. In ‘Conservation of Australia’s Forest Fauna’. (Ed. D. Lunney.) pp. 418–434. (Royal Zoological Society of NSW: Sydney.)

Goosem, M. (2007). Fragmentation impacts caused by roads through rainforests. Current Science 93, 1587–1595.

Hardy, A., Clevenger, A., Huijser, M., and Neale, G. (2003). An overview of methods for evaluating the effectiveness of wildlife crossing structures. In ‘2003 Proceedings of the International Conference on Ecology and Transportation’. (Eds C. L. Irwin, P. Garrett and K. P. McDermott.) pp. 319–330. (North Carolina State University.)

Huijser, M. P., Wagner, M. E., Hardy, A., Clevenger, A. P. and Fuller, J. A. (2007). Animal–vehicle collision data collection throughout the United States and Canada. In ‘2007 Proceedings of the International Conference on Ecology and Transportation’. (Eds C. L. Irwin, D. Nelson and K. P. McDermott.) pp. 387–391. (North Carolina State University.)

Izumi, Y. (2001). Impacts of roads and fragmentation on fauna on the Atherton and Evelyn Tablelands, North Queensland. M.App.Sc. Thesis, James Cook University, Cairns.

Kanowski, J., Felderhof, L., Newell, G., Parker, T., Schmidt, C., Stern, B., Wilson, R., and Winter, J. (2001). Community survey of the distribution of Lumholtz’s tree-kangaroo on the Atherton Tablelands, north-east Queensland. Pacific Conservation Biology 7, 79–86.

Laurance, S. G., and Laurance, W. F. (1999). Tropical wildlife corridors: use of linear rainforest remnants by arboreal mammals. Biological Conservation 91, 231–239.
Tropical wildlife corridors: use of linear rainforest remnants by arboreal mammals.Crossref | GoogleScholarGoogle Scholar |

Laurance, W. F. (1990). Comparative responses of five arboreal marsupials to tropical forest fragmentation. Journal of Mammalogy 71, 641–653.
Comparative responses of five arboreal marsupials to tropical forest fragmentation.Crossref | GoogleScholarGoogle Scholar |

Laurance, W. F. (1995). Extinction and survival of rainforest mammals in a fragmented tropical landscape. In ‘Landscape Approaches in Mammalian Ecology and Conservation’. (Ed. W. Z. Lidicker Jr.) pp. 46–63. (University of Minnesota Press: Minneapolis.)

Laurance, W. F. (1997). Responses of mammals to rainforest fragmentation in tropical Queensland: a review and synthesis. Wildlife Research 24, 603–612.
Responses of mammals to rainforest fragmentation in tropical Queensland: a review and synthesis.Crossref | GoogleScholarGoogle Scholar |

Laurance, W. F., and Laurance, S. W. (1996). Responses of five arboreal marsupials to recent selective logging in tropical Australia. Biotropica 28, 310–322.
Responses of five arboreal marsupials to recent selective logging in tropical Australia.Crossref | GoogleScholarGoogle Scholar |

Laurance, W. F., Laurance, S. G., and Hilbert, D. W. (2008). Long-term dynamics of a fragmented rainforest mammal assemblage. Conservation Biology 22, 1154–1164.
Long-term dynamics of a fragmented rainforest mammal assemblage.Crossref | GoogleScholarGoogle Scholar | 18637907PubMed |

Laurance, W. F., Goosem, M., and Laurance, S. G. (2009). Impacts of roads and linear clearings on tropical forests. Trends in Ecology & Evolution 24, 659–669.
Impacts of roads and linear clearings on tropical forests.Crossref | GoogleScholarGoogle Scholar |

Magnus, Z., Kriwoken, L. K., Mooney, N. J., and Jones, M. E. (2004). Reducing the incidence of roadkill: improving the visitor experience in Tasmania. CRC for Sustainable Tourism Technical Report.

Mata, C., Hervas, I., Herranz, J., Suarez, F., and Malo, J. E. (2005). Complementary use by vertebrates of crossing structures along a fenced Spanish motorway. Biological Conservation 124, 397–405.
Complementary use by vertebrates of crossing structures along a fenced Spanish motorway.Crossref | GoogleScholarGoogle Scholar |

QDMR (Queensland Department of Main Roads) (1997). Roads in the wet tropics – planning, design, construction, maintenance and operation best practice manual. Queensland Department of Main Roads, Technology and Environment Division, Brisbane.

Shoo, L. P., Storlie, C., van der Wal, J., Little, J., and Williams, S. E. (2011). Targeted protection and restoration to conserve tropical biodiversity in a warming world. Global Change Biology 17, 186–193.
Targeted protection and restoration to conserve tropical biodiversity in a warming world.Crossref | GoogleScholarGoogle Scholar |

Taylor, B. D., and Goldingay, R. L. (2009). Can road-crossing structures improve population viability of an urban gliding mammal? Ecology and Society 14, 13.

Taylor, B. D., and Goldingay, R. L. (2010). Roads and wildlife: impacts, mitigation and implications for wildlife management in Australia. Wildlife Research 37, 320–331.
Roads and wildlife: impacts, mitigation and implications for wildlife management in Australia.Crossref | GoogleScholarGoogle Scholar |

Thwaites, T. (1998). Safe Passage. International Wildlife 28, 30–36.

Tracey, J. G. (1982). ‘The Vegetation of the Humid Tropical Region of North Queensland’. (CSIRO: Melbourne.)

Trott, L. (1996). Wet Tropics in Profile – a reference guide to the Wet Tropics of Queensland World Heritage Area. Wet Tropics Management Authority, Cairns.

van der Ree, R., van der Grift, E., Mata, C., and Suarez, F. (2007). Overcoming the barrier effect of roads – how effective are mitigation structures? An international review of the use and effectiveness of underpasses and overpasses designed to increase the permeability of roads for wildlife. In ‘2007 Proceedings of the International Conference on Ecology and Transportation’. (Eds C. L. Irwin, D. Nelson and K. P. McDermott.) pp. 423–432. (North Carolina State University.)

van der Ree, R., Heinze, D., McCarthy, M., and Mansergh, I. (2009). Wildlife tunnel enhances population viability. Ecology and Society 14, 7.

Weston, N. G. (2003). The provision of canopy bridges to reduce the effects of linear barriers on arboreal mammals in the Wet Tropics of northeastern Queensland. M.Sc. Thesis, James Cook University, Cairns.

Wilson, R. F. (2000). The impact of anthropogenic disturbance on four species of arboreal folivorous possums in the rainforest of north eastern Queensland, Australia. Ph.D. Thesis, James Cook University, Cairns.

Wilson, R., and Goosem, M. (2008). Ringtail possum home range evaluation and monitoring in habitats adjacent to the canopy bridges over the Palmerston Highway. In ‘Highway Overpass Evaluation of Effectiveness – Kuranda Range Road Upgrade Project’. (Eds M. Goosem, R. Wilson, N. Weston and M. Cohen.) (James Cook University: Cairns.)

Wilson, R. F., Marsh, H., and Winter, J. (2007). Importance of canopy connectivity for home range and movements of the rainforest arboreal ringtail possum (Hemibelideus lemuroides). Wildlife Research 34, 177–184.
Importance of canopy connectivity for home range and movements of the rainforest arboreal ringtail possum (Hemibelideus lemuroides).Crossref | GoogleScholarGoogle Scholar |

Wilson, R. F., Goosem, M., and Wilson, G. W. (2008). Resilience of arboreal folivores to habitat damage by a severe tropical cyclone. Austral Ecology 33, 573–579.
Resilience of arboreal folivores to habitat damage by a severe tropical cyclone.Crossref | GoogleScholarGoogle Scholar |