Wongan Hills Triggerplant (Stylidium coroniforme) Interim Recovery Plan 2003-2008

Interim recovery plan no. 149
Gillian Stack, Nicole Willers and Andrew Brown
Department of Conservation and Land Management, WA, 2003

Summary

Scientific Name: Stylidium coroniforme Common Name: Wongan Hills Triggerplant
Family: Stylidiaceae Flowering Period: September - November
Dept Regions: Wheatbelt, Midwest Dept Districts: Merredin, Geraldton
Shires: Wongan-Ballidu, Perenjori Recovery Teams: Wongan/Ballidu Threatened Flora Recovery Team (WBTFRT), Geraldton District Threatened Flora Recovery Team (GDTFRT)

Illustrations and/or further information: A. Brown, C. Thomson-Dans and N. Marchant (Eds) (1998) Western Australia's Threatened Flora; H. Stace and D.J. Coates (1995) Wongan Hills triggerplant recovery plan; D.J. Coates. (1992b) Genetic consequences of a bottleneck and spatial genetic structure in the triggerplant Stylidium coroniforme (Stylidiaceae); R. Erickson and J.H. Willis (1966) Some additions to Australian Stylidiaceae.

Current status: Stylidium coroniforme was declared as Rare Flora in April 1980. It currently meets World Conservation Union (IUCN, 2000) Red List Category 'EN' under criteria B2ab(iii,v) due to its area of occupancy estimated to be less than 500 km2, the severe fragmentation of populations and the continuing decline in the area, extent and quality of habitat and the number of mature individuals. The main threats are poor recruitment, lack of and degraded habitat, accidental destruction and fire.

Distribution and habitat: Stylidium coroniforme is currently known from two disjunct areas. The main area of distribution is in Wongan Hills while the other is near Maya, about 140 km to the north. Recent genetic analysis has shown that plants in the two areas represent different taxa and it is likely that the Maya populations will be described as distinct (Coats pers. Comm.). If this happens, the Maya taxon will be proposed as Declared Rare Flora in its own right and the ranking of Stylidium coroniforme will neeed to be reviewed. S. coroniforme grows on shallow yellow sand over laterite on open areas in low scrub and heath (Brown et al. 1998).

Critical habitat: The critical habitat for Stylidium coroniforme comprises the area of occupancy of the known populations; similar habitat within 200 metres of known populations; corridors of remnant vegetation that link populations 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 subspecies, and important populations: Given that this species is listed as Endangered it is considered that all known habitat containing wild and translocated populations is habitat critical and that all populations are important.

Benefits to other species/ecological communities: Recovery actions implemented to improve the quality or security of the habitat of Stylidium coroniforme will also improve the status of remnant vegetation in which it is located.

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 Stylidium coroniforme 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.

Social and economic impacts: The implementation of this recovery plan is unlikely to cause significant adverse social and economic impacts. Just two of the 10 known populations are on Private property and may cause some minor impact on farming activities.

Evaluation of the Plans Performance: The Department of Conservation and Land Management, in conjunction with the Recovery Team will evaluate the performance of this IRP. 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. Land managers have been made aware of the location and threatened status of the species.
  2. Approximately 28,000 seeds collected from Populations 1, 2, 3, 4 and 5 in December 1993 are stored in DCLM's Threatened Flora Seed Centre at -18°C.
  3. The Botanic Garden and Parks Authority currently have four plants from a single clone.
  4. Staff from DCLM's Merredin and Geraldton Districts regularly monitor populations of the species.
  5. The Wongan/Ballidu Threatened Flora Recovery Team and Geraldton District Threatened Flora Recovery Team are overseeing the implementation of this IRP and will include information on progress in their annual reports to DCLM's Corporate Executive and funding bodies.

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 10% or more.
Criteria for failure: The number of individuals within populations and/or the number of populations have decreased by 10% or more.

1. Coordinate recovery actions 7. Promote community awareness
2. Conduct recruitment trials 8. Install DRF markers
3. Undertake weed control 9. Monitor populations
4. Collect and store seed 10. Conduct surveys
5. Liaise with land managers 11. Obtain biological and ecological information
6. Care, control and management of habitat 12. Review this IRP and revise it or prepare a full Recovery Plan if necessary