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Austrostipa Bronwenae

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Austrostipa Bronwenae THREATENED SPECIES SCIENTIFIC COMMITTEE Established under the Environment Protection and Biodiversity Conservation Act 1999 The Minister approved this conservation advice and included this species in the Endangered category, effective from 15/02/2018 Conservation Advice Austrostipa bronwenae Summary of assessment Conservation status Austrostipa bronwenae has been found to be eligible for listing in the Endangered category, as outlined in the attached assessment. Reason for conservation assessment by the Threatened Species Scientific Committee This advice follows assessment of information provided by Western Australia as part of the Common Assessment Method process, to systematically review species that are inconsistently listed under the EPBC Act and relevant state/territory legislation or lists. More information on the Common Assessment Method is available at: http://www.environment.gov.au/biodiversity/threatened/cam The information in this assessment has been compiled by the relevant state/territory government. In adopting this assessment under the EPBC Act, this document forms the Approved Conservation Advice for this species as required under s266B of the EPBC Act. Public consultation Notice of the proposed amendment and a consultation document was made available for public comment for 31 business days between 11 April 2017 and 29 May 2017. Any comments received that were relevant to the survival of the species were considered by the Committee as part of the assessment process. Recovery plan A recovery plan for this species under the EPBC Act is not recommended, because the Approved Conservation Advice provides sufficient direction to implement priority actions and mitigate against key threats. The relevant state/territory may decide to develop a plan under its equivalent legislation. Recommendations (i) The Committee recommends that the list referred to in section 178 of the EPBC Act be amended by including in the list in the Endangered category: Austrostipa bronwenae (ii) The Committee recommends that there not be a recovery plan for this species. Threatened Species Scientific Committee 13 September 2017 Austrostipa bronwenae Conservation Advice Nomination summary (to be completed by nominator) Current conservation status Scientific name: Austrostipa bronwenae Common name: Family name: Poaceae Fauna Flora Nomination for: Listing Change of status Delisting 1. Is the species currently on any conservation list, either in a State or Territory, Australia or Internationally? Provide details of the occurrence and listing status for each jurisdiction in the following table 2. Is it present in an Australian jurisdiction, but not listed? Listing category i.e. State / Territory in Date listed or critically Listing criteria i.e. Jurisdiction which the species assessed (or endangered or B1ab(iii)+2ab(iii) occurs N/A) ‘none’ International (IUCN Red List) National (EPBC Act) State / Territory 1. WA (WC Act 1950) 07/04/2014 Critically B2ab(ii,iii,v) Endangered B1ab(ii,iii,v)+B2ab(ii,iii,v); 2. WA (WC Act 1950) 05/10/2016 Endangered C2(a)(i) 3. Consistent with Schedule 1, item 2.7 (h) and 2.8 of the Common Assessment Method Memorandum of Understanding, it is confirmed that: this assessment meets the standard of evidence required by the Common Yes No Assessment Method to document the eligibility of the species under the IUCN criteria; Comments: surveys of the species were adequate to inform the assessment; Yes No Comments: Targeted surveys have been undertaken between 2003 and 2015 at all three subpopulations. Plots have been established at all three sites for monitoring and population estimates. Other vegetation surveys and ecological community surveys have been conducted in much of the remnant vegetation of the Swan Coastal Plain in previous years. the conclusion of the assessment remains current and that any further information Yes No that may have become available since the assessment was completed supports or is consistent with the conclusion of the assessment. Comments: Assessment has changed due to re-calculation of the AOO using the 2x2km grid method. No longer meets CR under criterion B2. Meets EN under criterion B1, B2 and C2(a)(i). Page 2 of 9 Nominated national conservation status: category and criteria Presumed extinct (EX) Critically endangered (CR) Endangered (EN) Vulnerable (VU) None (least concern) Data Deficient Conservation Dependent What are the IUCN Red List criteria that support the recommended B1ab(ii,iii,v)+B2ab(ii,iii,v); C2(a)(i) conservation status category? Eligibility against the IUCN Red List criteria (A, B, C, D and E) Provide justification for the nominated conservation status; is the species eligible or ineligible for listing against the five criteria. For delisting, provide details for why the species no longer meets the requirements of the current conservation status. A. Population size reduction Plant numbers have reduced at the Kemerton subpopulation by 80% (evidence of decline) – from 100 in 2003 to 20 plants in 2008, with a recent survey (2015) only locating one plant. Insufficient data to assess across all of the species’ subpopulations. B. Geographic range (B1) The three known locations of the species are highly disjunct. Using Minimum Convex Polygon, the EOO is 651 km2. (EOO and AOO, number of locations and evidence of (B2) The Area of Occupany is 12km2 using the 2x2km grid method. decline) (a) The species is severely fragmented and only occurs at four subpopulations from three locations approximately 175 km apart. The degree of fragmentation has increased beyond the natural level of separation of the flat low-lying calcareous winter wet habitat type on the extensively cleared Swan Coastal Palin. (b) Continuing decline observed and projected: (ii) The Kemerton subpopulation had an area occupied of 0.1 km2 but this declined within five years to 200 m2. If management does not succeed in protecting the remaining habitat at Kemerton, then it is projected that the location will become extinct, resulting in a projected decline in number of locations and AOO. (iii) Ongoing threats to habitat condition and extent from sand mining, proposed development, weed competition and a drying climate. (v) Plant numbers have reduced at the Kemerton subpopulation by 80% from 100 in 2003 to 20 plants in 2008, with a recent survey (2015) only locating one plant. Meets criteria for Endangered B1ab(ii,iii,v)+B2ab(ii,iii,v) C. Small population size and There are 333 mature individuals in total. decline If management does not succeed in protecting the remaining habitat (population size, at Kemerton, then it is projected that the total plant numbers will distribution and evidence of reduce a further 5.6% and the total number of locations by one out decline) of three (33%). Page 3 of 9 Largest subpopulation 232 plants, i.e. number of mature individuals in each subpopulation is < 250. Meets criteria for Endangered C2(a)(i) D. Very small or restricted (D) There are 333 mature individuals in total. population Meets criteria for Vulnerable D1 (population size) E. Quantitative analysis No information to assess (statistical probability of extinction) Summary of assessment information EOO 651 km2 (MCP) AOO 12 km2 (2 km x 2 km grid), and Generation Unknown actual mapped area of length subpopulations is 0.0114 km2. No. locations 3 Severely fragmented Yes No Unknown No. subpopulations 4 No. mature individuals 333 Percentage global population within Australia 100% Percentage population decline over 10 years or 3 generations Unknown Threats (detail how the species is being impacted) Threat Extent Impact (describe the threat and how it impacts on the species. Specify if the (give details of (what is the level threat is past, current or potential) impact on whole of threat to the species or specific conservation of subpopulations) the species) Recreational activities Kenwick and Severe Motorbike riders that use the area for recreation can easily gain Bunbury access, and are in the process destroying the habitat. Unauthorised subpopulations users create tracks and cubby houses. Fencing is in disrepair at the Kenwick subpopulation and the Bunbury subpopulation is on a recreation reserve. Current Weed invasion Kenwick and Severe Weed invasion has led to habitat degradation. Weeds suppress Kemerton early plant growth by competing for soil moisture, nutrients and subpopulations light. They also increase the fire hazard due to the easy ignition of high fuel loads, which are produced annually by many grass weed species. Control of grassy weeds via herbicides will require care as they may also impact on the Austrostipa. Perennial Veldt Grass (Ehrharta calycina) and African Lovegrass (Eragrostis curvula) both occur in the more disturbed areas of the Kenwick subpopulation and narrowleaf cottonbush (Gomphocarpus fruticosus) is also problematic for the Kemerton subpopulations. Current and future Page 4 of 9 Grazing (kangaroos) Kemerton Severe Kangaroos (scientific name) are reducing seed production and subpopulation hence the establishment of seedlings, thereby limiting natural recruitment. Current Feral pigs Kemerton Moderate Feral pigs (scientific name) cause severe damage to plants and subpopulation (severe damage to their habitat by digging through large areas of soil in search of Austrostipa food. They also increase the potential of weed and nutrient bronwenae plants introduction, and the soil disturbance they create encourages occurred in 2008) establishment of weeds. Grazing may also reduce the reproductive output
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