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Ecology of Feral Camels in Australia WK Saalfeld GP Edwards

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Ecology of Feral Camels in Australia WK Saalfeld GP Edwards Chapter 2: Ecology of feral camels in Australia WK Saalfeld GP Edwards Managing the impacts of feral camels in Australia: a new way of doing business Desert Knowledge CRC Contributing author information Keith Saalfeld: Department of Natural Resources, Environment, The Arts and Sport, PO Box 1120, Alice Springs, Northern Territory 0871, Australia Glenn Edwards: Department of Natural Resources, Environment, The Arts and Sport, PO Box 1120, Alice Springs, Northern Territory 0871, Australia Contents 1. Summary .......................................................................................................................................... ����������������������� 13 1.1 Recommendations ............................................................................................................... ����������������������� 13 2. The establishment of feral camels in Australia ............................................................................... ����������������������� 14 3. Aspects of camel biology and ecology ............................................................................................. ����������������������� 14 3.1 Habitat use .......................................................................................................................... ����������������������� 14 3.2 Food and water .................................................................................................................... ����������������������� 15 3.3 Movements .......................................................................................................................... ����������������������� 16 3.4 Social organisation and behaviours .................................................................................... ����������������������� 16 3.5 Reproduction ....................................................................................................................... ����������������������� 17 3.6 Diseases and parasites ......................................................................................................... ����������������������� 18 3.7 Mortality ............................................................................................................................. ����������������������� 18 4. Feral camel population and distribution .......................................................................................... ����������������������� 19 4.1 Camel distribution and abundance ...................................................................................... ����������������������� 19 4.2 Camel population dynamics ................................................................................................ ����������������������� 29 5. Recommendations ............................................................................................................................ ����������������������� 31 6. References ........................................................................................................................................ ����������������������� 32 Tables Table 2.1: Camel abundance and densities across jurisdictions between 1969 and the present .......... ����������������������� 22 Table 2.2: Projected camel population in 2008 for the most recent aerial surveys areas from 2001 to 2007 ��������� 23 Table 2.3: NLWRA density classes and associated density range and mean density .......................... ����������������������� 25 Table 2.4: Feral camel population estimates for each jurisdiction within the camel’s range based on Krigging interpolation of known aerial survey population density distribution ...................................... ����������������������� 28 Table 2.5: Feral camel population abundance and density for each of the major tenure classifications within the Australian camel distribution ................................................................................................... ����������������������� 28 10 Desert Knowledge CRC Managing the impacts of feral camels in Australia: a new way of doing business Ch 2: Ecology of feral camels in Australia, pp –34 Figures and graphs Figure 2.1: Australian rangelands and the current Australian camel distribution ................................ ����������������������� 20 Figure 2.2: Current Australian camel distribution and density at 1:250 000 scale resolution ............. ����������������������� 21 Figure 2.3: Locations of broadscale aerial surveys included in Table 2.3 of projected distribution that were used for the Krigging analysis ................................................................................................................ ����������������������� 24 Figure 2.4: Density distribution of camels across the range of the camel in Australia ........................ ����������������������� 27 Figure 2.5: Tenure types within the Australian feral camel distribution with feral camel density contours overlain � 30 List of shortened forms NRM Natural resource management GIS Geographic information system NLWRA National Land and Water Resources Audit ESRI Environmental Systems Research Institute Acknowledgements This report is Chapter 2 of the final report for the project ‘Cross-jurisdictional management of feral camels to protect NRM and cultural values’. The project was funded by the Australian Government. The views expressed herein do not necessarily represent the views of Desert Knowledge CRC or its participants. We would like to thank Professor Murray McGregor, Benxaing Zeng, and Phil Gee for their valuable input into what is happening with feral camel populations in Australia, and Dr Peter Whitehead for his detailed and frank criticism of the draft of this document. It has been improved considerably through his input. Managing the impacts of feral camels in Australia: a new way of doing business Desert Knowledge CRC 11 Ch 2: Ecology of feral camels in Australia, pp –34 12 Desert Knowledge CRC Managing the impacts of feral camels in Australia: a new way of doing business Ch 2: Ecology of feral camels in Australia, pp –34 Chapter 2: Ecology of feral camels in Australia 1. Summary The camel played an important role in the development of central Australia in both the nineteenth and early twentieth centuries. The replacement of the camel by the motor vehicle in the early twentieth century resulted in large numbers of animals being released into the wild and the subsequent establishment of a feral population in arid Australia. Monitoring of Australia’s camel population was haphazard at best until the 1980s. Since that time, a number of systematic surveys of camel distribution and abundance have been carried out across substantial areas of the camel’s distribution. The current distribution of the camel covers much of arid Australia. Up to 50% of Australia’s rangelands are reported as having camels present, as are most of the arid regions of Western Australia (WA), South Australia (SA), the Northern Territory (NT), and parts of Queensland (Qld). The research reported here supports a current population estimate for the feral camel in Australia of approximately one million animals covering an area of some 3.3 million km2 at an overall density of 0.29 camels/km2. Densities vary, and the modelling of available data indicates that two substantial areas of high density are present, one centred on the Simpson Desert and the other on the Great Sandy Desert. The high density area covering the eastern part of the Great Sandy Desert has predicted densities in the range of 0.5 to greater than 2 animals/km2 and that on the Simpson Desert in the range 0.5–1.0 animals/km2. Modelling of camel population dynamics gives population growth rates in the range of 7–8 % per year, reflecting intrinsic rates of increase in the range 0.074–0.079 (McLeod & Pople 2008). On the basis of these rates of increase, a population doubling time of about nine years is likely. Further, based on the current Australian camel population estimate, these rates indicate potential for increase at 80 000 camels per year and accelerating, due to the exponential nature of population growth and the belief that camels have not yet reached the carrying capacity of the land (McLeod & Pople 2008). Camels appear to use most available habitat, with use reflecting seasonal influences related to food availability and breeding. Habitat types not used to any measured extent include mountain ranges and salt pans/lakes, although camels have been reported from both of these habitats. Camels use almost all available food sources with a clear suite of preferred species and are subject to limited mortality other than natural mortality associated with age. Few of the resources needed by camels appear to be limiting at current population densities, with the possible exception of water. Increased water stress during hot dry summers is proposed as the causal factor for the encroachment of camels into remote central Australian communities in recent years. Camels were reported trying to obtain access to water by entering communities and damaging water- related infrastructure including bores, taps, and air conditioning units. It would appear that without management camel populations have the potential to persist in large and growing numbers in already occupied sites and to expand into presently unoccupied or sparsely occupied areas. 1.1 Recommendations • That efforts are made to achieve a better understanding of the factors influencing the movement patterns and population distribution of feral camels at the local
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