Biodiversity

Species Profile and Threats Database


For information to assist proponents in referral, environmental assessments and compliance issues, refer to the Policy Statements and Guidelines (where available), the Conservation Advice (where available) or the Listing Advice (where available).
 
In addition, proponents and land managers should refer to the Recovery Plan (where available) or the Conservation Advice (where available) for recovery, mitigation and conservation information.

EPBC Act Listing Status Listed as Endangered
Listing and Conservation Advices Commonwealth Conservation Advice on Daviesia dielsii (Diels' Daviesia) (Threatened Species Scientific Committee (TSSC), 2009ak) [Conservation Advice].
 
Commonwealth Listing Advice on Daviesia dielsii (Diels' Daviesia) (Threatened Species Scientific Committee (TSSC), 2009al) [Listing Advice].
 
Recovery Plan Decision Recovery Plan not required, included on the Not Commenced List (1/11/2009).
 
Adopted/Made Recovery Plans
Federal Register of
    Legislative Instruments
Declaration under s178, s181, and s183 of the Environment Protection and Biodiversity Conservation Act 1999 - List of threatened species, List of threatened ecological communities and List of threatening processes (Commonwealth of Australia, 2000) [Legislative Instrument].
 
Inclusion of species in the list of threatened species under section 178 of the Environment Protection and Biodiversity Conservation Act 1999 (77) (26/05/2009) (Commonwealth of Australia, 2009k) [Legislative Instrument].
 
State Government
    Documents and Websites
WA:Threatened flora of the Western Central Wheatbelt (Collins, J., 2009) [State Species Management Plan].
WA:Western Australian Wildlife Management Program No. 28. Declared Rare and Poorly Known Flora in the Moora District (Patrick, S.J. & A.P. Brown, 2001) [State Species Management Plan].
State Listing Status
WA: Listed as Endangered (Wildlife Conservation Act 1950 (Western Australia): September 2013 list)
Scientific name Daviesia dielsii [19617]
Family Fabaceae:Fabales:Magnoliopsida:Magnoliophyta:Plantae
Species author E.Pritzel
Infraspecies author  
Reference Botanische Jahrb~ycher 35 (6 Dec. 1904) 249.
Distribution map Species Distribution Map

This is an indicative distribution map of the present distribution of the species based on best available knowledge. See map caveat for more information.

Other illustrations Google Images
http://www.anbg.gov.au/images/photo_cd/OF31S157935/073.html

Scientific name: Daviesia dielsii

Common name: Diels' Daviesia

The species is conventionally accepted (Pritzel 1904).

Diels' Daviesia is a low shrub with spreading branches, growing to 0.5–0.9 m in height. The small oval leaves are hairy, flattened and end in a point. Leaves of plants in southern populations are less hairy than those of northern populations. The species is generally inconspicuous, but very noticeable during flowering. The attractive flowers are small, bright orange-red and numerous (Brown et al. 1998; Crisp 1985; Patrick & Brown 2001; TSSC 2009al).

Diels' Daviesia is endemic to Western Australia where it is known from 15 populations in the Moora and Watheroo areas, approximately 145 and 185 km north of Perth, respectively. The species is located within the Northern Agricultural Natural Resource Management Region (TSSC 2009al).

Diels' Daviesia occurs within scattered patches of remnant vegetation in a landscape highly modified by agriculture. Much of the species' distribution includes increasingly degraded roadside reserves (TSSC 2009al).

The extent of occurrence, based on the 15 known populations, is estimated to be 1300 km² (WA DEC 2008). Records from the Western Australian Herbarium indicate a reduction in the extent of occurrence in Diels' Daviesia, and it is likely that further reductions in extent of occurrence will occur in the future. However, there are insufficient data available to judge whether the reduction is, or will be, severe (TSSC 2009al).

Area of occupancy is estimated to be approximately 0.0032 km² (WA DEC 2008).

Population monitoring surveys of Diels' Daviesia undertaken between 1995 and 2007 have been insufficient in obtaining evidence indicating a declining population trend. The 2007 survey estimated a total number of mature individuals of 830 (WA DEC 2008). Many of these mature individuals occur in increasingly degraded roadside reserves that are threatened by road maintenance activities and weed invasion. Two outlying populations of Diels' Daviesia discovered in the 1970s appear to have become extinct (TSSC 2009al).

Little is known about the ecology of Diels' Daviesia. The species grows on flat or elevated areas on a variety of sandy/gravelly loam soils. The species occurs in tall heath over low scrub or in heath with open shrub mallee (TSSC 2009al; WA CALM 2006).

Diels' Daviesia's flowering period is from July to August, and fruits appear in October. Pollinator species have not yet been identified. One population has been recorded recovering well from bushfire, indicating this species may be a disturbance opportunist, however the role of fire is not known (TSSC 2009al; WA CALM 2006).

Diels' Daviesia is now confined to fragmented remnant vegetation within its former range. Eleven populations of Diels' Daviesia are found along increasingly degraded roadsides, where they are threatened by severe weed invasion and road maintenance activities such as grading. Grazing is a potential threat to one population on private property. Mining activities effected two extant populations in 2004, resulting in the loss of six individuals, but mining has now ceased in this area. Historically, land clearing for agriculture was a threat to Diels' Daviesia. Herbarium records show the species was collected in two locations north and south of current populations in the 1970s: extensive surveying has not relocated these populations. Ongoing land clearing within the species' range has largely ceased, however the landscape has been highly modified and fragmented (TSSC 2009al; WA CALM 2006).

Minister's Reasons for Recovery Plan Decision
A recovery plan for this species is not considered to be necessary at this time as the approved conservation advice provides sufficient direction to implement priority actions and mitigate against threats (2009).

The Commonwealth Conservation Advice on Daviesia dielsii (Diels' Daviesia) (TSSC 2009ak) outlines the following research priorities:

  • Design and implement a monitoring program.
  • Undertake survey work in suitable habitat and potential habitat to locate any additional populations.
  • Undertake seed germination and/or vegetative propagation trials to determine the requirements for successful establishment, including the role of fire.

In addition, the Commonwealth Conservation Advice on Daviesia dielsii (Diels' Daviesia) (TSSC 2009ak) outlines the following priority actions:

  • 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.
  • Manage threats to areas of vegetation that contain populations of Diels' Daviesia.
  • Ensure chemicals or other mechanisms used to eradicate weeds do not have a significant adverse impact on Diels' Daviesia.
  • Ensure road widening and maintenance activities (or other infrastructure or development activities as appropriate) in areas where Diels' Daviesia occurs do not adversely impact on known populations.
  • Protect populations of the listed species through the development of conservation agreements and/or covenants.
  • Identify and remove weeds in the local area, which could become a threat to Diels' Daviesia, using appropriate methods.
  • Manage sites to prevent introduction of invasive weeds, which could become a threat to Diels' Daviesia, using appropriate methods.
  • Develop and implement a suitable fire management strategy for Diels' Daviesia.
  • Identify appropriate intensity and interval of fire to promote seed germination.
  • Provide maps of known occurrences to local and state rural fire services and seek inclusion of mitigative measures in bush fire risk management plan(s), risk register and/or operation maps.
  • Ensure grazing pressure at known sites on private property is appropriate and does not prevent recruitment.
  • Prevent grazing at known sites on leased crown land through exclusion fencing or other barriers.
  • Raise awareness of Diels' Daviesia within the local community.
  • Continue installing roadside markers near all populations occurring on roadside verges.
  • Undertake appropriate seed collection and storage.
  • Investigate options for linking, enhancing or establishing additional populations.

The Conservation Advice on Daviesia dielsii (Diels' Daviesia) (TSSC 2009ak) provides a brief biological description and recommended management actions. In addition the Declared Rare and Poorly Known Flora in the Moora District. Wildlife Management Program No. 28. (Patrick & Brown 2001) is available.

The following table lists known and perceived threats to this species. Threats are based on the International Union for Conservation of Nature and Natural Resources (IUCN) threat classification version 1.1.

Threat Class Threatening Species References
Agriculture and Aquaculture:Livestock Farming and Grazing:Grazing pressures and associated habitat changes Commonwealth Conservation Advice on Daviesia dielsii (Diels' Daviesia) (Threatened Species Scientific Committee (TSSC), 2009ak) [Conservation Advice].
Commonwealth Listing Advice on Daviesia dielsii (Diels' Daviesia) (Threatened Species Scientific Committee (TSSC), 2009al) [Listing Advice].
Human Intrusions and Disturbance:Human Intrusions and Disturbance:Mechanical disturbance during construction, maintanance or recreational activities Daviesia dielsii in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006gm) [Internet].
Invasive and Other Problematic Species and Genes:Invasive Non-Native/Alien Species:Competition and/or habitat degradation by weeds Species threats data recorded on the SPRAT database between 1999-2002 (Department of Sustainability, Environment, Water, Population and Communities (DSEWPaC), 2012i) [Database].
Commonwealth Listing Advice on Daviesia dielsii (Diels' Daviesia) (Threatened Species Scientific Committee (TSSC), 2009al) [Listing Advice].
Invasive and Other Problematic Species and Genes:Invasive and Other Problematic Species and Genes:unspecified Daviesia dielsii in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006gm) [Internet].
Natural System Modifications:Fire and Fire Suppression:Inappropriate prescribed regimes and/or vegetation management to control fire regimes Species threats data recorded on the SPRAT database between 1999-2002 (Department of Sustainability, Environment, Water, Population and Communities (DSEWPaC), 2012i) [Database].
Pollution:Agricultural Effluents:Herbicide application Daviesia dielsii in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006gm) [Internet].
Pollution:Airborne Agricultural pollutants:Pesticide drift Daviesia dielsii in Species Profile and Threats (SPRAT) database (Department of the Environment and Heritage (DEH), 2006gm) [Internet].
Transportation and Service Corridors:Roads and Railroads:Development and/or maintenance of roads Commonwealth Conservation Advice on Daviesia dielsii (Diels' Daviesia) (Threatened Species Scientific Committee (TSSC), 2009ak) [Conservation Advice].
Commonwealth Listing Advice on Daviesia dielsii (Diels' Daviesia) (Threatened Species Scientific Committee (TSSC), 2009al) [Listing Advice].

Brown, A., C. Thomson-Dans & N. Marchant, eds. (1998). Western Australia's Threatened Flora. Como, Western Australia: Department of Conservation and Land Management.

Crisp, M.D. (1985). Conservation of the Genus Daviesia. Canberra, ACT: Australian Government Publishing Service.

Patrick, S.J. & A.P. Brown (2001). Western Australian Wildlife Management Program No. 28. Declared Rare and Poorly Known Flora in the Moora District. [Online]. Perth, Western Australia: Department of Conservation and Land Management. Available from: http://www.dpaw.wa.gov.au/plants-and-animals/threatened-species-and-communities/threatened-plants.

Pritzel, E. (1904). Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie:.

Threatened Species Scientific Committee (TSSC) (2009ak). Commonwealth Conservation Advice on Daviesia dielsii (Diels' Daviesia). [Online]. Department of the Environment, Water, Heritage and the Arts. Available from: http://www.environment.gov.au/biodiversity/threatened/species/pubs/19617-conservation-advice.pdf.

Threatened Species Scientific Committee (TSSC) (2009al). Commonwealth Listing Advice on Daviesia dielsii (Diels' Daviesia). [Online]. Department of the Environment, Water, Heritage and the Arts. Available from: http://www.environment.gov.au/biodiversity/threatened/species/pubs/19617-listing-advice.pdf.

Western Australia Department of Conservation and Land Management (WA CALM) (2006). Records held in CALM's Declared Flora Database and rare flora files. Perth, Western Australia: WA CALM.

Western Australia Department of Conservation and Land Management (WA CALM) (2008). Records held in CALM's Declared Rare Flora Database and rare flora files. Western Australia Department of Conservation and Land Management. Perth, Western Australia: Department of Conservation and Land Management.

Western Australia Department of Environment and Conservation (WA DEC) (2008). Records held in DEC's Declared Flora Database and rare flora files. Perth, Western Australia: WA DEC.

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This database is designed to provide statutory, biological and ecological information on species and ecological communities, migratory species, marine species, and species and species products subject to international trade and commercial use protected under the Environment Protection and Biodiversity Conservation Act 1999 (the EPBC Act). It has been compiled from a range of sources including listing advice, recovery plans, published literature and individual experts. While reasonable efforts have been made to ensure the accuracy of the information, no guarantee is given, nor responsibility taken, by the Commonwealth for its accuracy, currency or completeness. The Commonwealth does not accept any responsibility for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the information contained in this database. The information contained in this database does not necessarily represent the views of the Commonwealth. This database is not intended to be a complete source of information on the matters it deals with. Individuals and organisations should consider all the available information, including that available from other sources, in deciding whether there is a need to make a referral or apply for a permit or exemption under the EPBC Act.

Citation: Department of the Environment (2014). Daviesia dielsii in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat. Accessed Thu, 31 Jul 2014 19:28:37 +1000.