Collie North Bio-landscape

Posted on Dec 23, 2014

Collie North bio-landscapeTerrestialBiodiversity

Priority Bio-landscapes were identified across the region in the 2009 Biodiversity Sub-strategy. A 5 km by 5 km grid was placed across the region and those landscapes that had the highest concentrations of biodiversity value within the region were identified. Those landscapes that were identified as having a combination of high rarity for flora/fauna/communities and vegetation associations were classified as Highest Priority bio-landscapes. Those that were identified as having high rarity for flora/fauna/communities but the vegetation associations within them were not rare were classified as Second Priority Bio-landscapes. The full report can be read here: 2009 Biodiversity Sub-Strategy

The Collie North bio-landscape is found to the North West of Collie, located within the Shires of Collie and Harvey and within the Leschenault catchment.

The Worsley Alumina mine is found within this bio-landscape, within the Harris River State Forest. The Brunswick River meets with the Augustus River in the north west of the bio-landscape. The existence of the operating mine site within the bio-landscape may account for the high numbers of fauna populations identified in the area, due to the survey requirements associated with the activities of the minesite. The identification of this area as a priority bio-landscape is more indicative of the values of the surrounding intact and vegetated landscape, most of which is State Forest.

Within the bio-landscape 2 priority flora populations; Pultenaea skinneri  and Meeboldina thysanantha, as well as 50 endangered and 17 priority fauna populations have been identified including species such as water rat, western brush wallaby, quenda, quokka, forest red-tailed black cockatoo, Baudin’s cockatoo, Carnaby’s cockatoo, Wambenger or brush-tailed Phascogale and western false pipistrelle.

Collie North bio-landscape and Climate Change

Projected level of risk due to:

Decreasing rainfall

Best case    VeryHighCircle

Worst caseVeryHighCircle


Increasing temperature

Best case   HighCircle

Worst caseHighCircle  to VeryHighCircle


  • where Best Case = MIROC5 and Worst case = CanESM2 at 2090 and RCP8.5; see more here
  • Decreasing rainfall = annual rainfall change as % of initial
  • Where Very High = greater than 25% reduction; High = 20-25% reductIon; Moderate = 15-20% (Note: no where in the region is there projected to be less than 15% reduction in rainfall).
  • Increasing temperature = change in maximum summer temperature
  • Where Very High = greater than 4 degree increase (maximum projected being 4.7 degrees within the Region); High = 3-4 degree increase; Moderate = 2.5 – 3 degree increase; Low = 2 – 2.5 degree increase (Note: no where in the region is there projected to be less than a 2 degree increase which although lower than the very high 4 degree increase, will still have significant impacts on the environment).

This analysis is a simplistic way of looking at the potential risk of an asset to projected changes in rainfall and temperature. Assets may respond to climatic changes differently and species may be able to adapt in ways we don’t yet fully understand.

SWCC Strategic Priority

The Collie North bio-landscape is identified as a second order priority asset within SWCC’s NRM Strategy under the Terrestrial Biodiversity theme.





  • 2009 Biodiversity Sub-Strategy for the South West Catchments Council Prepared for the South West Catchments Council by Ecosystem Solutions Pty Ltd 2009.

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