Spreading Grevillia (Grevillea humifusa) Interim Recovery Plan 2003-2008

Gillian Stack and Val English
Department of Conservation and Land Management, WA, 2003

Summary

Scientific Name:Grevillea humifusaCommon Name:Spreading Grevillea
Family:ProteaceaeFlowering Period:June - September
Dept Region:MidwestDept District:Moora
Shire:DandaraganRecovery Team:Moora District Threatened Flora Recovery Team (MDTFRT)

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.

Current status: Grevillea humifusa was Declared as Rare Flora under the Western Australian Wildlife Conservation Act 1950 in October 1996 and ranked as Critically Endangered (CR) in November 1998. It currently meets World Conservation Union (IUCN 2000) Red List Category 'CR' under criteria B1ab(iii)+2ab(iii) (IUCN 2000) as there is only one known population with continuing decline in the quality of habitat. The species is also listed as Endangered under the Commonwealth Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). There are approximately 1500 plants known in one population. This population occurs in a highly disturbed area and the species is affected by loss and fragmentation of habitat. The main threats are weed competition, inappropriate fire regimes and road and firebreak maintenance activities.

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

Critical habitat: The critical habitat for Grevillea humifusa comprises the area of occupancy of the known population; similar habitat within 200 metres of known population; corridors of remnant vegetation that link subpopulations 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 requirements: Grevillea humifusa occurs on an undulating plain of gravelly loam that supports very disturbed open low Eucalyptus loxophleba and E. wandoo woodland over species including Kennedia prostrata, Jacksonia sp. and Dianella revoluta. Plants occur in highly disturbed areas on private property and Shire road reserves. G. humifusa is apparently endemic to the Eneabba area of Western Australia.

Habitat critical to the survival of the species, and important populations
Given that this species is Critically Endangered it is considered that all known habitat is habitat critical. There is only one known population, and this population is therefore absolutely critical to the survival of the species.

Benefits to other species/ecological communities
There are no other known threatened species or ecological communities in the immediate vicinity of Grevillea humifusa. However, recovery actions implemented to improve the quality or security of the habitat of the species, such as weed control and rehabilitation, will be of benefit to the entire plant assemblage.

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 humifusa 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
There are not likely to be any major social or economic impacts associated with the implementation of this plan. There are subpopulations located on private land and Shire managed road reserves. Recovery actions refer to continued negotiations 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.

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

  1. Relevant land managers have been made aware of the location and threatened status of the species.
  2. Declared Rare Flora (DRF) markers have been installed at Population 1a.
  3. A stock-exclusion fence was erected at Population 1b in 1997.
  4. Surveys for new populations have been conducted.
  5. Seed has been collected and stored at the Department's Threatened Flora Seed Centre.
  6. A number of live plants are maintained in cultivation at the Botanic Garden and Parks Authority.
  7. Detailed research into the species' biology and ecology was begun in 2002.
  8. An information sheet has been produced that describes and illustrates the species.
  9. Staff from the Department's Moora District regularly monitor the population.
  10. The Moora District 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 the in situ population to ensure the long-term preservation of the species in the wild.

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

Recovery actions
1. Coordinate recovery actions9. Monitor population
2. Rehabilitate habitat as necessary10. Conduct further surveys
3. Undertake weed control11. Collect germplasm
4. Map critical habitat12. Undertake and monitor translocation
5. Develop guidelines for slashing of habitat13. Promote awareness
6. Undertake rabbit control14. Obtain biological and ecological information
7. Develop and implement a fire management strategy15. Review the need for a full Recovery Plan
8. Seek long-term protection of habitat