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Modelling horse management in the Australian Alps

Citation

Beeton, NJ and Johnson, CN, Modelling horse management in the Australian Alps, Ecological Management and Restoration, 20, (1) pp. 57-62. ISSN 1442-7001 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Ecological Society of Australia and John Wiley & Sons Australia, Ltd

DOI: doi:10.1111/emr.12350

Abstract

Management of the feral Horse (Equus caballus) in the Australian Alps bioregion is a difficult and emotive issue, with interested parties working from vastly differing perspectives. Compounding this, information regarding ecology and distribution of horses, and the cost and effectiveness of management strategies is often unknown or uncertain. Resolving these issues requires an objective approach with the flexibility to incorporate different potential scenarios. We used a spatially explicit population model to compare the potential effects of two different management strategies on populations of horses in the Australian Alps bioregion: culling from helicopters versus trapping and mustering. We populated the model using the results of population surveys conducted in 2014, vegetation data and cost estimates. We then provided an estimate of the effect of each strategy on population size across the Alps, and their corresponding costs, compared to no management. To account for uncertainties, we simulated different scenarios for horse population densities, dispersal rates and population growth rates. Management using aerial culling was more effective than mustering in every scenario modelled, and three to six times cheaper. Aerial culling was only slightly more effective within its control region. However, because mustering is necessarily restricted by road access, this translated to a substantial improvement in population control up to 2000 horses where growth and dispersal rates were high. Our results unequivocally suggest aerial culling as the only strategy that could effectively control horses within the modelled range of scenarios; this result stands in addition to its other potential benefits of lower cost, animal stress and landscape disturbance. A major advantage of this modelling approach is that we can easily update it with new data, test different measures of effectiveness and add new scenarios to adapt to the rapidly changing situation on the ground, both in terms of the ecology and the political climate.

Item Details

Item Type:Refereed Article
Keywords:adaptive management, aerial culling, Equus caballus, invasive species, spatial ecology, trapping, demography, population control
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Wildlife and Habitat Management
Objective Division:Environment
Objective Group:Control of Pests, Diseases and Exotic Species
Objective Field:Control of Pests, Diseases and Exotic Species at Regional or Larger Scales
UTAS Author:Beeton, NJ (Dr Nicholas Beeton)
UTAS Author:Johnson, CN (Professor Christopher Johnson)
ID Code:131288
Year Published:2019
Web of Science® Times Cited:2
Deposited By:Zoology
Deposited On:2019-03-12
Last Modified:2019-04-29
Downloads:0

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