Ironstone Grevillia (Grevillia elongata) Interim Recovery Plan 2003-2008

Interim Recovery Plan no. 131
Gillian Stack and Val English
Department of Conservation and Land Management, WA, 2003

Summary

Scientific Name: Grevillea elongata Common Name: Ironstone Grevillea
Family: Proteaceae Flowering Period: September - November
Dept Region: South West Dept District: Blackwood
Shire: Busselton Recovery Team: South West Region Threatened Flora Recovery Team (SWRTFRT)

Illustrations and/or further information: A. Brown, C. Thomson-Dans and N. Marchant (Eds) (1998) Western Australia's Threatened Flora; P. M. Olde and N. R. Marriott (1995) The Grevillea Book 2: 142-143.

Current status: In 1996 Grevillea elongata was declared as Rare Flora under the Western Australian Wildlife Conservation Act 1950 and the species is now listed as Endangered (EN). It currently meets World Conservation Union (IUCN, 2000) Red List Category 'EN' under criterion C1 (IUCN 2000) due to the high level of fragmentation of populations, and a continuing decline in the quality of the habitat. Grevillea elongata is also listed as Endangered under the Commonwealth Environmental Protection and Biodiversity Conservation Act 1999 (EPBC Act). The main threats are inappropriate fire regimes; disease; chemical drift; road, rail and firebreak maintenance activities; weed invasion; and pine plantation maintenance.

An Interim Recovery Plan was developed for the species in 1999 (Phillimore et al. 1999). Information collected since that plan was completed has been incorporated into this plan and this document now replaces Phillimore et al. (1999).

Critical habitat: The critical habitat for Grevillea elongata comprises the area of occupancy of the known populations; similar habitat within 200 metres of known populations; corridors of remnant vegetation that link populations; the catchment area for the surface and groundwaters that maintain the wetland habitat; and additional nearby occurrences of similar habitat that do not currently contain the species but may have done so and may be suitable for translocations.

Habitat critical to the survival of the species, and important populations
Given that this species is listed as Critically Endangered it is considered that all known habitat for wild and translocated populations is habitat critical.

Benefits to other species/ecological communities
Population 1 is located within an occurrence of a Threatened Ecological Community (TEC) listed as Endangered under the EPBC Act, and Critically Endangered in Western Australia. Petrophile latericola and Grevillea maccutcheonii which are listed as Critically Endangered under the Wildlife Conservation Act 1950 and Endangered under the EPBC Act also occur in the wider habitat of some populations of Grevillea elongata. Recovery actions implemented to improve the quality or security of the habitat of some populations of Grevillea elongata are likely to improve the status of the TEC in which this population is located, and also that of populations of other listed flora that occur in the wider habitat.

International Obligations
This plan is fully consistent with the aims and recommendations of the Convention on Biological Diversity, ratified by Australia in June 1993, and will assist in implementing Australia's responsibilities under that Convention. However, as Grevillea elongata is not listed under any international agreement, the implementation of other international environmental responsibilities is not affected by this plan.

Role and interests of indigenous people
There are no known indigenous communities interested or involved in the management of areas affected by this plan. Therefore no role has been identified for indigenous communities in the recovery of this species.

Social and economic impacts
Some populations of Grevillea elongata occur on private land and negotiations will continue with regard the future management of these populations. Recovery actions refer to continued liaison between stakeholders with regard these areas.

Evaluation of the Plan's Performance
The Department of Conservation and Land Management, in conjunction with the Recovery Team will evaluate the performance of this IRP. In addition to annual reporting on progress with listed actions and comparison against the criteria for success and failure, the plan is to be reviewed within five years of its implementation.

Habitat requirements: Grevillea elongata is endemic to Western Australia and is apparently confined to the Whicher Range area. It is found on soils ranging from red-brown gravelly clay over ironstone through light brown sandy clay over ironstone to grey sandy soils. It generally occurs in low, often very diverse heathland with Corymbia calophylla, Dryandra squarrosa subsp. argillacea, Calothamnus. sp Whicher and Xanthorrhoea sp.

Existing Recovery Actions: The following recovery actions have been or are currently being implemented -

  • All appropriate land managers have been informed of the location and threatened status of the species.
  • Declared Rare Flora (DRF) markers have been installed at all road and rail reserve populations.
  • Dashboard stickers and posters describing the significance of DRF markers have been produced and distributed.
  • An area of private property containing Population 7 was fenced in 1996 and purchased in 1998.
  • An area of private property containing Subpopulation 1e was fenced and purchased in 1999.
  • Seed was collected in 1995 and 1998, and stored in the Department's Threatened Flora Seed Centre (TFSC). Germinants produced through viability testing are being propagated by the Botanic Gardens and Parks Authority.
  • The Botanic Garden and Parks Authority currently have forty plants of Grevillea elongata grown from four clones.
  • Weed control research has been conducted at Population 2 by staff of the Department's Science Division.
  • Control of Bridal Creeper near Population 3 occurred in 1998.
  • Phosphite control of dieback disease has been undertaken in the habitat of Populations 1a to 1e, 2a to 2d and 7e.
  • The removal of pines to a 10m radius around Population 6 is ongoing.
  • A fire response strategy has been prepared and incorporated into the Blackwood District's Fire Control Working Plan.
  • Staff from the Department's Blackwood District regularly monitor all populations.
  • The South West Region Threatened Flora Recovery Team is overseeing the implementation of this IRP.

IRP Objective: The objective of this Interim Recovery Plan is to abate identified threats and maintain or enhance in situ populations to ensure the long-term preservation of the species in the wild.

Recovery criteria
Criteria for success: The number of individuals within populations and/or the number of populations have increased by ten percent or more.
Criteria for failure: The number of individuals within populations and/or the number of populations have decreased by ten percent or more.

Recovery actions
1. Coordinate recovery actions 9. Monitor populations
2. Map critical habitat 10. Conduct further surveys
3. Undertake weed control 11. Collect seed and cutting material
4. Implement fire response strategy 12. Investigate need for translocation
5. Cull pines 13. Obtain biological and ecological information
6. Maintain disease hygiene 14. Promote awareness
7. Continue Phytophthora control 15. Review the need for a full Recovery Plan
8. Liaise with land managers