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Spatial analysis of Tasmania's native vegetation cover and potential implications for biodiversity conservation

Citation

Michaels, KF and Norton, TW and Lacey, MJ and Williams, J, Spatial analysis of Tasmania's native vegetation cover and potential implications for biodiversity conservation, Ecological Management & Restoration, 11, (3) pp. 194-200. ISSN 1442-7001 (2010) [Refereed Article]


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Copyright Statement

Copyright 2010 Ecological Society of Australia

DOI: doi:10.1111/j.1442-8903.2010.00549.x

Abstract

The landscape modification model proposed by McIntyre and Hobbs (1999) was used to assess the modification of Tasmania’s native vegetation and its potential implications for biodiversity conservation. The inclusion of new ‘substates’ in the model allowed the varying degrees of landscape variegation and fragmentation observed in Tasmania to be quantified. The mapped extent of Tasmania’s native vegetation is approximately 5.06 million ha or 74% of the land area. The extent of native vegetation varies across bioregions from a low of around 36% in the Tasmanian Northern Midlands bioregion to a high of 94% in the Tasmanian West bioregion. Overall, the Tasmanian landscape can be described as medium variegated as the State retains 76% cover of native vegetation, by area. Two of Tasmania’s nine bioregions are in an intact state, four are variegated, and three are fragmented. Seven of the State’s 48 catchments are in an intact state, 24 catchments are variegated, and 17 are fragmented. Tasmania was estimated to support 33 760 patches of native vegetation. Fewer than 3% of these patches exceed 50 ha in area. Small and medium patches occur predominantly on freehold land with grazing as a major land use, whereas large patches occur predominantly on crown land with conservation and production forestry as the major land uses. One feature of the State’s native vegetation is the large tract of native vegetation ecosystems in western Tasmania. Opportunities arise to sustain the resilience of these native ecosystems both by consolidating the formal protection of vegetation within catchments such as the Arthur and Pieman and by strengthening environmental management in adjacent areas. Bioregions and catchments where climate change may be of particular concern for biodiversity conservation and management include the Tasmanian Northern Midlands bioregion and Cam catchment in north-western Tasmania. The maintenance and enhancement of patches of remnant vegetation in these areas will be challenging and appears likely to require strategic, multiscale and coordinated natural resource management over decades. Limiting the loss of native vegetation across the entire range of landscape states in Tasmania appears essential to mitigate the further decline of biodiversity.

Item Details

Item Type:Refereed Article
Keywords:biodiversity conservation;landscape connectivity;native vegetation;Tasmania
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Landscape Ecology
Objective Division:Environment
Objective Group:Environmental and Natural Resource Evaluation
Objective Field:Environmental and Natural Resource Evaluation not elsewhere classified
Author:Michaels, KF (Dr Karyl Michaels)
Author:Norton, TW (Professor Tony Norton)
Author:Lacey, MJ (Dr Michael Lacey)
Author:Williams, J (Professor Jann Williams)
ID Code:61348
Year Published:2010
Deposited By:Agricultural Science
Deposited On:2010-03-02
Last Modified:2012-10-02
Downloads:5 View Download Statistics

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