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Approved Conservation Advice for Corokia Whiteana

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Approved Conservation Advice for Corokia Whiteana This Conservation Advice was approved by the Minister / Delegate of the Minister on: 1/10/2008 Approved Conservation Advice (s266B of the Environment Protection and Biodiversity Conservation Act 1999) Approved Conservation Advice for Corokia whiteana This Conservation Advice has been developed based on the best available information at the time this Conservation Advice was approved; this includes existing plans, records or management prescriptions for this species. Description Corokia whiteana, Family Grossulariaceae / Escalloniaceae, also known as Corokia, is a shrub or small tree to 4 m tall. Its young shoots, branches and flowers are scattered with hairs, which are sparser on older leaves, and mainly on the under-surface. The leaves, some of which are toothed, are mostly 2–7 cm long and 2–20 mm wide, tapering to the apex. The cream-coloured flowers are scented, usually have four petals held in loose clusters and occur from spring to summer. Flowers are followed by red, fleshy fruits, 8–12 mm long, usually with a single spindle-shaped seed (Harden, 2002; DECC NSW, 2005). Conservation Status Corokia whiteana 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 vulnerable under the Threatened Species Conservation Act 1995 (NSW). Distribution and Habitat Corokia whiteana has a restricted distribution in north-east NSW (DECC NSW, 2005). Three distinct occurrences of the species are known: Nightcap Range, Tweed Valley, and near Brunswick Heads (DECC NSW, 2005) within the Mt Jerusalem National Park (NP), Nightcap NP, and Whian Whian State Forest (Sheringham & Westerway, 1995). Population counts range from 10 to 23, generally with scattered individuals (Quinn et al., 1995; Sheringham & Westerway, 1995; Karahed, 2002). Corokia whiteana occurs at altitudes of 10–800 m above sea level in ecotones between wet sclerophyll forest and Coachwood (Ceratopetalum apetalum) warm-temperate rainforests, or in Brush Box (Lophostemon confertus) open forest with littoral rainforest understorey (Quinn et al., 1995; DECC, 2005). Common vegetation associations include Black Wattle (Callicoma serratifolia) and Mountain Water Gum (Tristaniopsis collina) (Quinn et al., 1995). The species usually occurs on substrate derived from rhyolite and basalt, and also on quartzite sands (Quinn et al., 1995; J. Hunter, 2000, pers. comm.). This species occurs within the Northern Rivers (NSW) Natural Resource Management Region. The distribution of this species is not known to overlap with any EPBC Act-listed threatened ecological communities. Threats The main identified threats to C. whiteana are loss of habitat from clearing for urban expansion and agriculture; risk of extinction caused by stochastic events; forestry operations; inappropriate fire regimes; and invasion of habitat by weeds (DECC, 2005). The species responds well to increased light availability and thus has a positive response to disturbance (Quinn et al., 1995). Where this species occurs within State Forest, exclusion zones of at least 20 m wide must be implemented around 90% of individuals (DECC NSW, 2007). Corokia whiteana Conservation Advice - Page 1 of 3 This Conservation Advice was approved by the Minister / Delegate of the Minister on: 1/10/2008 Research Priorities Research priorities that would inform future regional and local priority actions include: • Design and implement a monitoring program or, if appropriate, support and enhance existing programs. • More precisely assess population size, distribution, fire ecology, ecological requirements, recruitment triggers, and the relative impacts of threatening processes (DECC NSW, 2005). • Undertake survey work in suitable habitat and potential habitat to locate any additional populations/occurrences/remnants. • Undertake seed germination trials to determine the requirements for successful establishment. • Identify critical factors limiting the recovery of C. whiteana (DECC NSW, 2005). Regional and Local Priority Actions The following priority recovery and threat abatement actions can be done to support the recovery of C. whiteana. 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. • Identify populations of high conservation priority. • Ensure road widening and maintenance activities (or other infrastructure or development activities) involving substrate or vegetation disturbance in areas where C. whiteana occurs do not adversely impact on known populations. • Protect remaining habitat from clearing, timber harvesting and fragmentation (DECC NSW, 2005). • Investigate further formal conservation arrangements, management agreements and covenants on private land, and for crown and private land investigate inclusion in reserve tenure if possible. • Control access routes to suitably constrain public access to known sites on public land. • Minimise adverse impacts from land use at known sites. Invasive Weeds • Identify and remove weeds in the local area, which could become a threat to C. whiteana, using appropriate methods. • Manage sites to prevent introduction of invasive weeds, which could become a threat to the species, using appropriate methods. • Ensure chemicals or other mechanisms used to eradicate weeds do not have a significant adverse impact on C. whiteana. Fire • Develop and implement a suitable fire management strategy for C. whiteana that includes protecting rainforest habitat from intense fire (DECC NSW, 2005). NSW RFS (2004) recommends excluding fire from this species. • 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. Conservation Information • Ensure that land managers and other stakeholders are aware of populations and habitat; ensure that management plans, fire plans and pest management plans take account of requirements for the recovery of C. whiteana (DECC NSW, 2005). Corokia whiteana Conservation Advice - Page 2 of 3 This Conservation Advice was approved by the Minister / Delegate of the Minister on: 1/10/2008 • Ensure the species is considered in statutory plans for Local Government Area's relevant to the distribution of C. whiteana (DECC NSW, 2005). Enable Recovery of Additional Sites and/or Populations • Undertake appropriate seed collection and storage. • Investigate options for linking, 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 C. whiteana, 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 • Private native forestry code of practice for northern NSW (DECC NSW, 2007), • Threatened species hazard reduction list (NSW RFS, 2004), • Plan of management for the parks and reserves of the Tweed Caladera, including Nightcap Range National Park (NSW NPWS, 2004), and • Fire management strategy for the northern rivers region, including Nightcap National Park (NSW NPWS, 2005). These prescriptions were current at the time of publishing; please refer to the relevant agency’s website for any updated versions. Information Sources: Department of Environment & Climate Change (DECC) NSW 2005, Corokia profile, viewed 23 April 2008, <http://threatenedspecies.environment.nsw.gov.au/tsprofile/profile.aspx?id=10178> Department of Environment and Climate Change (DECC) NSW 2007, Private native forestry code of practice for northern NSW, viewed 23 April 2008, <http://www.environment.nsw.gov.au/resources/pnf/0837copnorth.pdf> Harden, GJ (Ed) 2002, Flora of New South Wales, Volume Three, University of New South Wales Press, Sydney. Hunter, J 2000, NSW National Parks & Wildlife Service. Personal communication. Sydney. Karehed, J 2002, Evolutionary studies in asterids emphasising euasterids II - Comprehensive summaries of Uppsala dissertations from the Faculty of Science and Technology 761, Stockholm, Sweden. NSW National Parks & Wildlife Service (NPWS) 2004, Parks & Reserves of the Tweed Caldera, viewed 23 April 2008, <http://www.environment.nsw.gov.au/resources/parks/PoMMountWarningNPEtal.pdf> NSW National Parks & Wildlife Service (NPWS) 2005, Northern rivers region – Nightcap NP, Whian Whian SCA and Snows Gully NR fire management strategy (type 2), viewed 23 April 2008, <http://www.environment.nsw.gov.au/resources/parks/fmsNightcap.pdf> NSW Rural Fire Service (RFS) 2004, Threatened species hazard reduction list: Part 1 -Plants, viewed 23 April 2008, <http://www.rfs.nsw.gov.au/file_system/attachments/State/Attachment_20050304_5C7BDF1C.pdf> Quinn, F, Williams, JB, Gross, CL & Bruhl, J 1995, Report on rare and threatened plants of north-eastern New South Wales, University of New England, Armidale. Sheringham, P & Westaway, J 1995, Significant Vascular Plants of Upper North East NSW: A report by the NSW NPWS for the Natural Resources Audit Council, NSW National Parks & Wildlife Service, Sydney. Vallee, L, Hogbin, T, Monks, L, Makinson, B, Matthes, M & Rossetto, M 2004, Guidelines for the Translocation of Threatened Plants in Australia (2nd ed.), Australian Network for Plant Conservation, Canberra. Corokia whiteana Conservation Advice - Page 3 of 3 .
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