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Approved Conservation Advice for Acacia Awestoniana (Stirling Range Wattle)

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This conservation advice was approved by the Minister / Delegate of the Minister on 3 July 2008 Approved conservation advice (s266B of the Environment Protection and Biodiversity Conservation Act 1999) Approved Conservation Advice for Acacia awestoniana (Stirling Range Wattle) This Conservation Advice has been developed based on the best available information at the time this conservation advice was approved. Description Acacia awestoniana, Family Mimosaceae, also known as Stirling Range Wattle, is a spreading, straggly viscid (sticky) shrub to 3 m high by 4 m wide. The branchlets and phyllodes are glabrous (smooth). The phyllodes (modified leaves) have a stipule and are coriaceous (leathery), elliptical with six longitudinal veins. Flower heads are borne from September to November (Brown, Thomson-Dans & Marchant, 1998), in 1 to 3-headed racemes, and are globular and golden in colour. The pods are narrowly oblong and straight (Cowan & Maslin, 1990; Paczkowska & Chapman, 2000; Orchard & Wilson, 2001). Conservation Status Stirling Range Wattle is listed as vulnerable. This species is eligible for listing as vulnerable under the Environment Protection and Biodiversity Conservation Act 1999 (Cwlth) (EPBC Act) as, prior to the commencement of the EPBC Act, it was listed as vulnerable under Schedule 1 of the Endangered Species Protection Act 1992 (Cwlth). The species is also listed as rare flora under the Wildlife Conservation (Rare Flora) Notice 2006 (Western Australia). Distribution and Habitat Stirling Range Wattle is endemic to a northern portion of Stirling Range National Park, in south-western Western Australia. All known populations of the species are located within Stirling Range National Park (Briggs & Leigh, 1996), within the South Coast (Western Australia) Natural Resource Management Region. Three meta-populations have been recorded (Cowan & Maslin, 1990). The entire population is about 1000 individuals (Briggs & Leigh, 1996). All plants at the type location (Chester Road) were described as being in poor condition and displaying symptoms of stress or disease (Brown, Thomson-Dans & Marchant, 1998). Stirling Range Wattle occurs as a component of Wandoo Woodland or along watercourses in loam or sandy loam soils overlain with pebbles (Brown, Thomson-Dans & Marchant, 1998; Paczkowska & Chapman, 2000). Associated species include Wandoo (Eucalyptus wandoo), E. redacta and Prickly Moses (Acacia pulchella) (Brown, Thomson-Dans & Marchant, 1998). The distribution of this species is not known to overlap with any EPBC Act-listed threatened ecological communities. Threats The main identified threats to Stirling Range Wattle include its restricted distribution and small population size (Cochrane et al., 2002), browsing by feral rabbits (Oryctolagus cuniculus) and land degradation (Environment Australia, 1999). The main potential threats include dieback caused by Phytophthora cinnamomi, and competition from Wild Oats (Avena spp.) and Mistletoe (Amyema melaleucae) (DCLM, 2002). Stirling Range Wattle may possibly be fire-facultative or fire-obligate (Brown, Thomson-Dans & Marchant, 1998; Cochrane et al., 2002) and any alteration to the existing Acacia awestoniana Conservation Advice - Page 1 of 3 This conservation advice was approved by the Minister / Delegate of the Minister on 3 July 2008 fire regime may inhibit regeneration. SCRIPT (2006) has reported that a population of Stirling Range Wattle is subject to post-fire monitoring. Research Priorities Research priorities that would inform future regional and local priority actions include: • Design and implement a monitoring program that incorporates existing post-fire monitoring (DCLM, 2002; SCRIPT, 2006). • More precisely assess population size, distribution, ecological requirements and the relative impacts of threatening processes. • Undertake survey work in suitable habitat and potential habitat to locate any additional populations/occurrences/remnants. • Carry out seed germination trials to determine the requirements for successful establishment. Continue trials relating to successful seed storage. Regional and Local Priority Actions The following regional and local priority recovery and threat abatement actions can be done to support the recovery of Stirling Range Wattle. Habitat Loss, Disturbance and Modification • Monitor known populations to identify key threats. • Monitor the progress of recovery, including the effectiveness of management actions and the need to adapt them if necessary. • Manage threats to areas of vegetation that contain populations/occurrences/remnants of Stirling Range Wattle. • Ensure chemicals or other mechanisms used to eradicate weeds, especially Wild Oats, do not have a significant adverse impact on Stirling Range Wattle (DCLM, 2002). Invasive Weeds • Develop and implement a management plan for the control of introduced grasses, especially Wild Oats, in the northern portion of Stirling Range National Park where populations of Stirling Range Wattle occur (DCLM, 2002). Trampling, Browsing or Grazing • Develop and implement a feral rabbit management plan (Environment Australia, 1999) in the northern portion of Stirling Range National Park, where populations of Stirling Range Wattle occur. Fire • Develop and implement a suitable fire management strategy for Stirling Range Wattle. Continue monitoring populations of Stirling Range Wattle where fires have occurred (DCLM, 2002). • Identify appropriate intensity and interval of fire to promote vegetation regeneration. • Provide maps of known occurrences to local and state rural fire services and seek inclusion of mitigative measures in bush fire risk management plans, risk register and/or operation maps. Diseases, Fungi and Parasites • Develop and implement suitable hygiene protocols to protect known sites from further outbreaks of dieback caused by Phytophthora cinnamomi. • If necessary, implement appropriate management actions to minimise the adverse impacts of existing Phytophthora cinnamomi infestations. Acacia awestoniana Conservation Advice - Page 2 of 3 This conservation advice was approved by the Minister / Delegate of the Minister on 3 July 2008 Conservation Information • Raise awareness of Stirling Range Wattle within the local community. Encourage people to buy specimens only from licensed growers. Enable Recovery of Additional Sites and/or Populations • Undertake appropriate seed collection and storage. • Investigate options for enhancing or establishing additional populations. • Implement national translocation protocols (Vallee et al., 2004) if establishing additional populations is considered necessary and feasible. This list does not necessarily encompass all actions that may be of benefit to Stirling Range Wattle, but highlights those that are considered to be of highest priority at the time of preparing the conservation advice. Existing Plans/Management Prescriptions that are Relevant to the Species • General management policies for threatened species are prescribed in the Stirling Range and Porongurup National Parks Management Plan (DCLM – NPNCA, 1999), and • Threat Abatement Plan for Competition and Land Degradation by Feral Rabbits (Environment Australia, 1999). These prescriptions were current at the time of publishing; please refer to the relevant agency’s website for any updated versions. Information Sources: Briggs, JD & Leigh, JH 1996, Rare or Threatened Australian Plants 1995 rev. edn. CSIRO Publishing, Canberra. Brown, AC, Thomson-Dans & Marchant, N 1998, Western Australia’s Threatened Flora. CALM, Como. Cochrane, A, Kelly, A, Brown, K & Cunneen, S 2002, ‘Relationships between seed germination requirements and ecophysiological characteristics aid the recovery of threatened native plant species in Western Australia’, Ecological Management & Restoration vol 3, pp. 47–60. Cowan, RS & Maslin BR 1990, ‘Acacia miscellany 1. Some oligoneurous species of Acacia (Leguminosae: Mimosoideae: Section Plurinerves) from Western Australia’, Nuytsia vol 7, pp. 183–199 DCLM – NPNCA 1999, Stirling Range and Porongurup National Parks Management Plan 1999-2009, viewed 13 March 2008, <http://www.naturebase.net/pdf/nature/management/stirling-porongorup_nps.pdf>. DCLM 2002, A Biodiversity Audit of Western Australia’s 53 Biogeographic Sub-regions: Esperance 1 (Esp1 – Fitzgerald Sub-region. Department of Conservation and Land Management, Perth. Environment Australia 1999, Threat Abatement Plan for Competition and Land Degradation by Feral Rabbits, viewed 14 March 2008, <http://www.environment.gov.au/biodiversity/threatened/publications/tap/rabbits/index.html>. Orchard, AE & Wilson, AJG 2001, Flora of Australia Volume 11B, Mimosaceae, Acacia part 2, CSIRO Publishing, Canberra. Paczkowska, G & Chapman, AR 2000, The Western Australian Flora. A Descriptive Catalogue, The Wildflower Society of Western Australia Inc., The Western Australian Herbarium, CALM & The Botanic Gardens and Parks Authority, Perth. SCRIPT 2006, South Coast Regional Initiative Planning Team Annual Report, viewed 13 March 2008 <http://script.asn.au/documents/governance/SCRIPT_AR_05-06.pdf>. Vallee, L, Hogbin, T, Monks, L, Makinson, B, Matthes, M & Rossetto, M 2004, Guidelines for the Translocation of Threatened Plants in Australia - Second Edition, Australian Network for Plant Conservation, Canberra. Acacia awestoniana Conservation Advice - Page 3 of 3 .
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