Granite Outcrops: Ecological Asset 12

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Description

The ecological role that granite outcrops and inselbergs play in the environment is largely unknown; however, their biological significance is clear, with significant links between granite and the occurrence of a suite of vegetation communities, some of which include the Nodding Grass lilly (Stypandra glauca) and the Needle leaf honey myrtle (Malelauca armillaris ssp akineta) and surrounding dominant vegetation communities of Eucalytpus porosa and Callitris species.

It is believed granite outcrops support unique species assemblages and have water holding or storage properties and may serve as a drought refuge for some species. It is also believed some of granite outcrops running in a band from North to South in the central area of the region may also be culturally significant for local Aboriginal people.

Several granite outcrops exist within the WildEyre area and include Murphy’s Haystack, Snaggley Rock, Mt Wedge, Cocata Hill, The Kurbla, Mt Cooper, Mt Hall and Ucontitchie Hill.

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Threatened or Important Species

  • Nodding Grass lilly (Stypandra glauca)
  • Needle leaf honey myrtle (Melaleuca armillaris ssp akineta)
  • Granite Mudwort (Limosella granitica)

Threats to granite outcrops

  • Knowledge gaps – role granite outcrops play largely unexplored
  • Historical land clearance
  • Weed invasion
  • Habitat fragmentation
  • Drought and availability of fresh water for fauna that are attracted to outcrops

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