Water-remoteness for grazing relief in Australian arid-lands

• Published in: Biological conservation Vol. 141; no. 6; pp. 1447 - 1460
• Main Authors: Fensham, R.J., Fairfax, R.J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.2008; Kidlington, Oxford: Elsevier Science Ltd; Elsevier
• Subjects: Animal, plant and microbial ecology; Applied ecology; Arid; arid lands; Australia; biodiversity; Biological and medical sciences; Bos indicus; Bos taurus; Capra hircus; case studies; cattle; Conservation, protection and management of environment and wildlife; drinking water; Fundamental and applied biological sciences. Psychology; General aspects; goats; Grazing; habitats; herbivores; Macropus; Parks, reserves, wildlife conservation. Endangered species: population survey and restocking; pastoralism; population size; Rangelands; sheep; Water remoteness; wildlife; Australia; Oceania; Arid; Water remoteness; Rangelands; Australia; Grazing; Arid environment; Rangeland; Relief; Environmental protection
• ISSN: 0006-3207; 1873-2917
• DOI: 10.1016/j.biocon.2008.03.016

Commercial grazing is possible over much of arid Australia due to a high density of artificial watering points. The broadscale supplementation of drinking water has not only enhanced densities of sheep ( Ovies aries), cattle ( Bos taurus, Bos indicus) and goats ( Capra hircus), but has also contributed to increased populations of native kangaroos ( Macropus spp.) since pre-European times. Empirical data are compiled to identify threshold distances from water containing 95% of a population of grazing animals. For sheep the proposed threshold is 3 km, 6 km for cattle and 7 km for red kangaroos. Despite clear evidence of water-focussed grazing, evidence of decreased biodiversity in relation to distance to water is scant and conflicting between studies. Reasons for this include the limited power of sampling designs and further research is required to establish the value of water-remote areas as grazing-relief refuges and to demonstrate that the recovery of grazing sensitive species is achievable after grazing relief has been restored. An eastern Australian case study indicates that within some large areas used for commercial pastoralism, the density of water points is such that there is nowhere further than 7 km from water. Where water-remote areas persist, their maintenance should be paramount. In the context of rangeland pastoralism and high densities of water points, de-stocking and water-point closure over large areas will be the most effective means of achieving grazing relief and will require strategic land acquisition.