Seasonal range variation of Tadarida australis (Chiroptera : Molossidae) in Western Australia: the impact of enthalpy
R. D. Bullen A C and N. L. McKenzie BA 43 Murray Drive, Hillarys, WA 6025, Australia.
B Department of Conservation and Land Management, PO Box 51, Wanneroo, WA 6946, Australia.
C Corresponding author. Email: bullen2@bigpond.com
Australian Journal of Zoology 53(3) 145-156 https://doi.org/10.1071/ZO04080
Submitted: 11 November 2004 Accepted: 8 April 2005 Published: 16 June 2005
Abstract
The Australian bat Tadarida australis has a peculiar geographical niche that involves a continental-scale movement of over 10° of latitude in Western Australia. Its range expands northward by up to 1200 km for the winter and contracts southward for the summer. Its summer range limit correlates with an interaction of temperature and humidity, best summarised by atmospheric enthalpy. Its winter distribution is expanded northward within the enthalpy threshold, but appears to be further restricted in some areas by an unknown factor that may be biotic. We propose a potential competitor and a potential predator that may have strongly negative interactions in these regions. The 1% of records that are beyond the enthalpy envelope are from the change-over months and may be an artefact of year-to-year climatic variation. Three climatic thresholds enclose the enthalpy envelope: average annual rainfall >10 mm per month and <50 mm per month, and average overnight minimum temperature <20°C. Current literature relates migration of temperate-zone bats to resource availability as a consequence of changing season. We identify a tight correlation with atmospheric enthalpy that points to dissipation of flight muscle heat as a limiting factor.
Acknowledgments
We thank the Western Australian Museum for making their collection of specimens available to us for the study. Also we thank the Western Australian Department of Conservation and Land Management for contributing to the cost of the project. We thank Damien Milne for contributing presence data from the Northern Territory. We also thank C. Bullen, M. McKenzie and A. N. Start for assisting with the field echolocation surveys. We acknowledge Ecologia Ltd for supplying some echolocation data. Finally, we acknowledge the assistance of Haowei Liu of the University of California, San Diego, in running the GARP-WhyWhere analysis on our data.
Beard, J. S. (1980). A new phytogeographic map of Western Australia. Western Australian Herbarium Research Notes 3, 37–58.
Bullen, R. D. , and McKenzie, N. L. (2001). Bat airframe design – flight performance, stability and control in relation to foraging ecology. Australian Journal of Zoology 49, 235–261.
| Crossref | GoogleScholarGoogle Scholar |
Burbidge, A. A. , McKenzie, N. L. , and Hall, N. J. (1995). A biological survey of the eastern goldfields of Western Australia. Part 12. The Mount Manning–Mount Elvire study area. Records of the Western Australian Museum, Supplement 49, 169–312.
Cumming, G. S. , and Bernard, R. T. F. (1997). Rainfall, food abundance and timing of parturition in African bats. Oecologia 111, 309–317.
| Crossref | GoogleScholarGoogle Scholar |
Kitchener, D. J. , and Hudson, C. J. (1982). Reproduction in the female white-striped mastiff bat, Tadarida australis (Gray) (Molossidae). Australian Journal of Zoology 30, 1–14.
McKenzie, N. L. , and Bullen, R. D. (2003). Identifying Little Sandy Desert bat species from their echolocation calls. Australian Mammalogy 25, 73–80.
McKenzie, N. L. , Rolfe, J. K. , and Youngson, W. K. (1992). The biological survey of the eastern goldfields of Western Australia. Part 8. The Kurnalpi–Kalgoorlie study area. Records of the Western Australian Museum, Supplement 41, 37–64.
Muir, B. G. (1977). Biological survey of Western Australian wheatbelt. Part 2: vegetation and habitat of Bendering Reserve. Records of the Western Australian Museum, Supplement 3, 9–15.
Peterson, A. T. , Soberon, J. , and Sanchez-Cordero, V. (1999). Conservatism of ecological niches in evolutionary time. Science 285, 1265–1267.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
Stockwell, D. R. B. , and Peters, D. (1999). The GARP modelling system: problems and solutions to automated spatial prediction. International Journal of Geographical Information Science 13, 143–158.
| Crossref | GoogleScholarGoogle Scholar |
Taylor, J. C. (1980). Seasonal data on flying and airborne invertebrates collected by suction trap near Jandakot, Western Australia. Western Australian Institute of Technology, Department of Biology Bulletin 3, 1–12.
Wyrwoll, K.-H. , Hopwood, J. , and McKenzie, N. L. (1992). The holocene paleohydrology and climatic history of the northern Great Sandy Desert–Fitzroy Trough: with special reference to the history of the northwest Australian monsoon. Climatic Change 22, 47–65.
| Crossref | GoogleScholarGoogle Scholar |