Biodiversity

Species Profile and Threats Database


For information to assist proponents in referral, environmental assessments and compliance issues, refer to the Policy Statements and Guidelines (where available), the Conservation Advice (where available) or the Listing Advice (where available).
 
In addition, proponents and land managers should refer to the Recovery Plan (where available) or the Conservation Advice (where available) for recovery, mitigation and conservation information.

EPBC Act Listing Status Listed as Vulnerable as Allocasuarina tortiramula
Listing and Conservation Advices Commonwealth Conservation Advice on Allocasuarina tortiramula (Twisted Sheoak) (Threatened Species Scientific Committee, 2008hq) [Conservation Advice].
 
Recovery Plan Decision Recovery Plan not required, included on the Not Commenced List (1/11/2009).
 
Adopted/Made Recovery Plans
Federal Register of
    Legislative Instruments
Declaration under s178, s181, and s183 of the Environment Protection and Biodiversity Conservation Act 1999 - List of threatened species, List of threatened ecological communities and List of threatening processes (Commonwealth of Australia, 2000) [Legislative Instrument] as Allocasuarina tortiramula.
 
State Government
    Documents and Websites
WA:Declared Rare and Poorly Known Flora in the Narrogin District (Durell, G.S. & R.M. Buehrig, 2001) [State Species Management Plan].
WA:Declared Rare Flora in the Katanning District (Graham, M. & M. Mitchell, 2000) [State Species Management Plan].
State Listing Status
WA: Listed as Vulnerable (Wildlife Conservation Act 1950 (Western Australia): September 2013 list) as Allocasuarina tortiramula
Scientific name Allocasuarina tortiramula [22124]
Family Casuarinaceae:Casuarinales:Magnoliopsida:Magnoliophyta:Plantae
Species author E.M.Benn.
Infraspecies author  
Reference Wilson, K.L. & Johnson, L.A.S. in George, A.S. (Ed) (1989), Flora of Australia 3: 190 (137; Fig. 51; Map 127) [tax. nov.].
Other names Allocasuarina sp. 6 (Lake King) [23966]
Distribution map Species Distribution Map

This is an indicative distribution map of the present distribution of the species based on best available knowledge. See map caveat for more information.

Other illustrations Google Images

The Twisted Sheoak is a shrub with a dense canopy, growing to 1.7 m high, with spreading and twisted branchlets (Brown et al. 1998). Variations in branchlet surface from smooth to shortly pubescent give the plant a mixed green to bluish-grey appearance (Graham & Mitchell 2001).

The species is restricted to part of the southern wheatbelt near Newdegate in south-western WA.

Graham & Mitchell (2001) recorded two populations in a reserve west of Lake King. When last surveyed in 1987, each population consisted of about 5000 individuals (Graham & Mitchell 2001).

Coates (1992) recorded a single plant in Dragon Rocks NR. This is likely to be the same individual described by Brown et al. (1998) and Graham & Mitchell (2001) as "in the Narrogin district".

This species has shorter branchlet segments and fewer scale-like leaves than the related A. globosa and the leaves are broader and thicker in texture (Wilson & Johnson 1989; Brown et al. 1998).

The species grows in red-brown loam over granite (Brown et al. 1998). The region experiences hot, dry summers and mild, wet winters with a mean annual rainfall of approximately 360 mm (Coates 1992).

Allocasuarina tortiramula occurs in tall heath (Wilson & Johnson 1989), and forms dense thickets in association with Acacia lasiocalyx, Allocasuarina campestris and Hakea petiolaris (Brown et al. 1998).

The species is dioecious (Paczkowska & Chapman 2000). Flowering occurs July-Sept. The stalkless cones are up to 1.5 cm long (Brown et al. 1998).

Seedlings have established on a bulldozed firebreak at Lake King, indicating an ability to recolonise (Brown et al. 1998).

The following table lists known and perceived threats to this species. Threats are based on the International Union for Conservation of Nature and Natural Resources (IUCN) threat classification version 1.1.

Threat Class Threatening Species References
Agriculture and Aquaculture:Livestock Farming and Grazing:Grazing pressures and associated habitat changes Allocasuarina tortiramula in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006bm) [Internet].
Ecosystem/Community Stresses:Indirect Ecosystem Effects:Restricted geographical distribution (area of occupancy and extent of occurrence) Allocasuarina tortiramula in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006bm) [Internet].
Invasive and Other Problematic Species and Genes:Invasive Non-Native/Alien Species:Competition and/or habitat degradation by weeds Allocasuarina tortiramula in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006bm) [Internet].
Invasive and Other Problematic Species and Genes:Invasive and Other Problematic Species and Genes:Presence of pathogens and resulting disease Allocasuarina tortiramula in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006bm) [Internet].
Natural System Modifications:Fire and Fire Suppression:Inappropriate and/or changed fire regimes (frequency, timing, intensity) Allocasuarina tortiramula in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006bm) [Internet].
Natural System Modifications:Other Ecosystem Modifications:Changes in hydrology leading to rising water tables and dryland salinity Allocasuarina tortiramula in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006bm) [Internet].

Brown, A., C. Thomson-Dans & N. Marchant, eds. (1998). Western Australia's Threatened Flora. Como, Western Australia: Department of Conservation and Land Management.

Coates, A. (1992). Flora and vegetation survey of the Dragon Rocks Nature Reserve (No. A 36128). Page(s) 183. WA CALM. WA CALM.

Council of Heads of Australian Botanic Gardens (CHABG) (1994). Census of plants in botanic gardens. [Online]. Canberra: Australian National Botanic Gardens. Available from: http://www.anbg.gov.au/chabg/census/census.html.

Graham, M. & M. Mitchell (2000). Declared Rare Flora in the Katanning District. [Online]. Western Australia Department of Conservation and Land Management. Available from: http://www.dpaw.wa.gov.au/plants-and-animals/threatened-species-and-communities/threatened-plants.

Paczkowska, G. & A.R. Chapman (2000). The Western Australian Flora, A Descriptive Catalogue. The Wildflower Society of Western Australia (Inc.), the Western Australian Herbarium, Department of Conservation and Land Management and the Botanic Gardens & Parks Authority.

Wilson, K.L. & L.A.S.Johnson (1989). Casuarinaceae. In: Flora of Australia. 3:100-174. Canberra: AGPS.

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This database is designed to provide statutory, biological and ecological information on species and ecological communities, migratory species, marine species, and species and species products subject to international trade and commercial use protected under the Environment Protection and Biodiversity Conservation Act 1999 (the EPBC Act). It has been compiled from a range of sources including listing advice, recovery plans, published literature and individual experts. While reasonable efforts have been made to ensure the accuracy of the information, no guarantee is given, nor responsibility taken, by the Commonwealth for its accuracy, currency or completeness. The Commonwealth does not accept any responsibility for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the information contained in this database. The information contained in this database does not necessarily represent the views of the Commonwealth. This database is not intended to be a complete source of information on the matters it deals with. Individuals and organisations should consider all the available information, including that available from other sources, in deciding whether there is a need to make a referral or apply for a permit or exemption under the EPBC Act.

Citation: Department of the Environment (2014). Allocasuarina tortiramula in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Sun, 31 Aug 2014 20:33:38 +1000.