Acacia repanda

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA MAGNOLIOPSIDA FABALES LEGUMINOSAE

Scientific Name: Acacia repanda
Species Authority: R.S.Cowan & Maslin
Taxonomic Notes: Closely related to Acacia ephedroides Benth.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2012
Date Assessed: 2010-09-09
Assessor(s): Malcolm, P.
Reviewer(s): Hilton-Taylor, C.
Justification:
Acacia repanda is a large shrub that has a restricted distribution to shrublands in granite outcrops in Western Australia. It is known from two main areas Holt Rock area and Wongan Hills, however, it has not been collected in the latter since 1935 and it is presumed to be extinct in this area. The area of occupancy warrants listing this species in an Endangered category (AOO ~32 km2 based on 2x2 cells ). The total extent of occurrence of the species qualifies it as Vulnerable (EOO ~7,800 km2) and if the species is not found in the Wongan Hills area then it would qualify as Endangered (EOO ~780 km2). The habitat is highly fragmented due to clearing for agriculture and there is a continuing decline in the quality of the habitat mainly due to higher salinity and mining activities. Further changes in species dynamics are due to changes in fire regimes and introduced weeds and grazing pressure. The species is currently known from three locations (excluding the Wogan Hills record and making the assumption that increasing salinity might affect subpopulations in nature reserves differently than those outside of these).

Geographic Range [top]

Range Description:Acacia repanda is endemic to Australia, it has a disjunct distribution occurring in the Holt Rock area with one collection from Wongan Hills (c. 300 km to the northwest) in southwestern Western Australia. Despite the fact that other wheat-belt acacia species show this pattern of distribution, the record in the Wogan Hills area is based on a collection from 1935, since then, this region has been thoroughly collected by the species was not found again, so it may have become extinct in this area (Cowan and Maslin 1995).
Countries:
Native:
Australia (Australian Capital Territory, New South Wales, Northern Territory, Queensland, South Australia, Victoria, Western Australia, Western Australia)
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: Total population size is not known, it was last collected in 1999. It is not clear whether the plant still occurs in the northern locality in Wongan Hills, since it was last collected from here in 1935.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: A large shrub to 2 m high that usually grows in loam or sandy loam near granite outcrops, in heath, scrub and shrubland.
Systems: Terrestrial

Threats [top]

Major Threat(s): The Western Mallee region where this species occurs is highly fragmented almost completely cleared as wheatfields. Salinity, vegetation fragmentation, weeds, fire, feral herbivores and predators have had a profound affect on the region. Many ecosystems and species populations are in poor condition and trend is declining. Changes in hydrology due to drought and ground water extraction for agriculture is resulting in increase salinity. Lowland communities (tall woodlands, mallee and Melaleuca shrublands, freshwater and naturally saline wetlands) are under threat from rising watertables, and most of these communities will be lost. Mining activities are common in the area, especially gypsum mining (Beecham and Danks 2001).

Conservation Actions [top]

Conservation Actions: It is known to occur within Lake Hurlstone Nature Reserve and Nature Reserve No. 29027. It is listed as 3KC- in Briggs and Leigh (1995) a poorly known taxon with a geographic range more than 100 km2 that is known to occur within a reserve but the population size is not known. It is also listed as Priority 3 in Smith (2010); taxa which are known from several populations, at least some of which are not believed to be under immediate threat. The seeds for this species have been collected as part of the Millennium Seed Bank project. Seeds are located at: Wakehurst Place, Royal Botanic Gardens, Kew (UK) and Kings Park & Botanic Garden, Perth (Australia). Salinity revegetation works were planned in 2006 for the Narragin area (http://www.dec.wa.gov.au/content/view/1475/772/). Further monitoring is needed to review habitat status and levels of threat and to determine whether this species is still occurring in Wongan Hills area.

Bibliography [top]

Beecham, B. and Danks, A. 2001. Mallee 2 (MAL2 - Western Mallee subregion). In: Department of the Environment, Water, Heritage and the Arts (eds), A Biodiversity Audit of Western Australia’s 53 Biogeographical Subregions in 2002.

Briggs, J.D. and Leigh, J.H. 1995. Rare or threatened Australian plants. Centre for Plant Biodiversity Research, Canberra.

Commonwealth of Australia. 1999. Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). Available at: http://www.environment.gov.au/cgi-bin/sprat/public/publicthreatenedlist.pl?wanted=flora. (Accessed: 10 June 2010).

Cowan, R.S. and Maslin, B.R. 1995. Acacia Miscellany 10. New taxa and notes on previously described taxa of Acacia, mostly Juliflorae (Leguminosae: Mimosoideae), in Western Australia. Nuytsia 10(1): 15-62.

IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.2). Available at: http://www.iucnredlist.org. (Accessed: 17 October 2012).

Orchard, A.E. and Wilson, A.J.G. 2001. Mimosaceae, Acacia part 1. In: B.R. Maslin (ed.), Flora of Australia Volume 11A, ABRS, Canberra.

Smith, M.G. 2010. Declared Rare and Priority Flora List for Western Australia, 25 March 2010. Dept of Environment and Conservation, Como, W.A.


Citation: Malcolm, P. 2012. Acacia repanda. In: The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 20 September 2014.
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