Mallee and Mallee-Broombush dominated woodland and shrubland, lacking Triodia, in the NSW South Western Slopes Bioregion - profile

Indicative distribution


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predicted
The areas shown in pink and/purple are the sub-regions where the species or community is known or predicted to occur. They may not occur thoughout the sub-region but may be restricted to certain areas. ( click here to see geographic restrictions). The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Mallee and Mallee-Broombush dominated woodland and shrubland, lacking Triodia, in the NSW South Western Slopes Bioregion
Conservation status in NSW: Critically Endangered Ecological Community
Commonwealth status: Not listed
Gazetted date: 24 Sep 2010
Profile last updated: 07 Sep 2017

Description

Mallee and Mallee-Broombush dominated woodland and shrubland, lacking Triodia, in the NSW South Western Slopes Bioregion varies in structure from tall mallee woodland with an open to mid-dense shrub layer and ground cover (sparseness perhaps an artifact of grazing history), to open or very dense mallee shrubland, with or without Broombush (Melaleuca uncinata). Three variants have been described (Benson 2008) as distinct communities, based largely on canopy composition and their tendency to occur on somewhat different landforms. These are 'ID 355: Bull Mallee-White Mallee tall mallee woodland on red sandy loam soils in the central western slopes of NSW'; 'ID 177: Blue Mallee-Bull Mallee-Green Mallee very tall mallee shrubland of the West Wyalong region, NSW South Western Slopes Bioregion', and 'ID 178: Broombush-Green Mallee-Blue Mallee very tall shrubland on stony rises in the NSW South Western Slopes Bioregion'. Benson noted however that these units do intergrade. The floristic composition of shrub layer and ground cover varies widely within, and overlaps between, the variants and the variability in the density and floristic composition of the shrub and ground layers may be partly a consequence of grazing history.

This community typically has a canopy layer co-dominated by the mallee eucalypts Eucalyptus behriana (Bull Mallee) and E. dumosa (White Mallee), with either (on flat land) E. socialis (Red Mallee), or (on low rises) E. polybractea (Blue Mallee) and E. viridis (Green Mallee). More rarely, on higher rocky rises, the dominant species may be E. polybractea and either E. viridis or E. dwyeri (Dwyer's Red Gum), with a tall shrub layer of Melaleuca uncinata. Additional conspicuous tree species may include Casuarina cristata (Belah), Callitris glaucophylla (White Cypress Pine), and C. endlicheri (Black Cypress Pine). The shrub layer may vary strongly from site to site but typically includes Acacia species such as A. hakeoides (Hakea Wattle), A. havilandiorum (Havilands Wattle), A. rhigiophylla (Dagger-leaf Wattle), A. rigens (Nealie), A. tetragonophylla (Dead Finish) and A. homalophylla (Yarran); Eremophila species such as E. deserti (Turkeybush), E. longifolia (Berrigan, Emu Bush) and E. sturtii (Narrow-leaf Emu-bush, Turpentine Bush); Melaleuca uncinata; Alectryon oleifolius subsp. canescens (Western Rosewood); Dodonaea viscosa subsp. cuneata (Wedge-leaf Hopbush); and Myoporum montanum (Western Boobialla). Ground cover is variable but includes daisies, small chenopods, Sida corrugata, Cheilanthes spp. (Rock Ferns) and a variety of other forb and grass species.

Distribution

Mallee and Mallee-Broombush dominated woodland and shrubland, lacking Triodia, in the NSW South Western Slopes has a very highly restricted distribution, with known occurrences falling with a region of less than 4000 km2 bounded by Lake Cowal - Temora - Ardlethan - Ungarie. It is estimated that the total area remaining is around 2300 hectares within the local government areas of Bland and Temora. Most remaining areas are on private property or within roadside easements, though small areas are known from the following Natures Reserves: Buddigower, The Charcoal Tank, portions of South West Woodland (former Blue Mallee Flora Reserve and State Forest and Wyalong State Forest) and possibly Big Bush.

Habitat and ecology

  • The variant of the community dominated by Bull Mallee and White Mallee tends to occur on plains to the east and north of West Wyalong on red earths including the aeolian soil known as parna.
  • The variant dominated by Blue Mallee - Bull Mallee - Green Mallee tends to occur on low hills and rises in sandy loam soils over substrates including gravel ferricrete (ironstone) and mixed sedimentary, metamorphic and granitic substrates
  • The third variant, Broombush - Green Mallee - Blue Mallee, occurs in loamy sands on rocky rises of sandstone and other sedimentary rock types, mainly to the south west of West Wyalong.

Regional distribution and habitat

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Threats

Recovery strategies

Activities to assist this species

Information sources

IBRA Bioregion IBRA Subregion Known or predicted Geographic restrictions region
NSW South Western SlopesLower Slopes Known None