Stipiturus mallee

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	AVES	Passeriformes	Maluridae

Scientific Name:

Stipiturus mallee

Species Authority:

Campbell, 1908

Common Name/s:

English

–

Mallee Emuwren, Mallee Emu-wren

Assessment Information [top]

Red List Category & Criteria:

Endangered A2abc+3bc+4abc ver 3.1

Year Assessed:

2008

Assessor/s

BirdLife International

Evaluator/s:

Butchart, S. & Mahood, S. (BirdLife International Red List Authority)

Justification:
This species has a small and severely fragmented range within which habitat is continuing to decline owing to fire. It is now known to be undergoing a very rapid population reduction and this has caused it to be uplisted to Endangered. It requires immediate sensitive habitat management to help slow this worrying decline.

History:

2006	–	Vulnerable
2004	–	Vulnerable
2000	–	Vulnerable
1994	–	Lower Risk/conservation dependent
1988	–	Threatened

Geographic Range [top]

Range Description:	Stipiturus mallee has a severely fragmented distribution in the Victorian and South Australian mallee regions, Australia, south and east of the Murray River. In South Australia, birds were found in Ngarkat and associated conservation parks but, in 1989, apparently disappeared from the isolated Billiatt Conservation Park as a result of fire. In Victoria, birds ranged from Sunset Country, east to Anuello Fauna and Flora Reserve, south-east of Hattah-Kulkyne National Park, and in the Big Desert (Wyperfeld) east to Bronzewing State Faunal Reserve. The species is now considered to be confined to three subpopulations: Ngarkat Conservation Park, Murray Sunset National Park, and Hattah-Kulkyne National Park and adjacent Crown land¹. Birds are unlikely to disperse more than 5 km, meaning that this species's subpopulations are effectively isolated³. The population was estimated at c.10,000 individuals and judged to be declining by Garnett and Crowley (2000), though at the time there was no reasonable data for estimating the population using any formal methodology¹. More recently the population has been estimated at only 2,100-4,200 individuals, including perhaps 1,500-2,800 mature individuals¹. Declines have been significant in the southern and western parts of the species's range. Some isolated populations in Victoria and South Australia are now considered to be very small and in some cases verging on extinction¹. The Ngarkat population is now considered to be the only viable population remaining in South Australia, due to a series of fires that have affected the conservation park since 2004². The extent of the species's range in Ngarkat, appears to have declined by 95% (c.90% of the range in South Australia) from about 2000 km² in the early to mid-1990s, and numbers have gone from perhaps 'thousands' to no more than 100 individuals^2,3. Similar patterns of decline have been reported in Victora², of 868 playback survey sites covering the Murray Mallee Reserve System the species was only recorded at 15 sites in the Murray-Sunset National Park and one in the Big Desert⁶. Its status in South Australia is now considered critical¹. The total area of suitable habitat was estimated to be less than 2,000 km² by Garnett and Crowley (2000) , but conservative estimates have put this at less than 4,000 km² more recently¹. The species is expected to continue to decline over the next 10 years, as pressures from fire and drought have not altered¹.
Countries:	Native: Australia
Range Map:	(click map to view full version)

Population [top]

Population:	It appears to have declined heavily in recent years; wildfires have wiped out remnant subpopulations. The actual estimate is 2131-4164, with perhaps 1500-2800 mature individuals (Mustoe 2006).
Population Trend:	Decreasing

Habitat and Ecology [top]

Habitat and Ecology:	It occupies habitats containing hummock grassland Triodia, usually within low woodland dominated by mallee eucalypts Eucalyptus and cypress pine Callitris. It also occurs in heath containing banksias Banksia or casuarinas Allocasuarina. In Ngarkat, it can disperse at least 6 km into vegetation recovering from fire, 3-4 years after it has been burnt. Highest densities occur 8-10 years after fire, although it persists in vegetation 50 years old. Much apparently suitable habitat is unoccupied. Throughout its range it appears to be confined to relatively small discontinuous fragments of habitat¹. Anecdotal evidence suggests that habitat suitability may be influenced by rainfall through its affect on the health of Triodia, and in turn on the abundance of insect prey. Annual rainfall increases as a gradient heading east, and may explain why eastern areas of its range seem to be a stronghold¹. Occasional increases in adult mortality may be offset by a meta-population structure which is bolstered by cooperative breeding⁵.
Systems:	Terrestrial

Habitat and Ecology:

It occupies habitats containing hummock grassland Triodia, usually within low woodland dominated by mallee eucalypts Eucalyptus and cypress pine Callitris. It also occurs in heath containing banksias Banksia or casuarinas Allocasuarina. In Ngarkat, it can disperse at least 6 km into vegetation recovering from fire, 3-4 years after it has been burnt. Highest densities occur 8-10 years after fire, although it persists in vegetation 50 years old. Much apparently suitable habitat is unoccupied. Throughout its range it appears to be confined to relatively small discontinuous fragments of habitat¹. Anecdotal evidence suggests that habitat suitability may be influenced by rainfall through its affect on the health of Triodia, and in turn on the abundance of insect prey. Annual rainfall increases as a gradient heading east, and may explain why eastern areas of its range seem to be a stronghold¹. Occasional increases in adult mortality may be offset by a meta-population structure which is bolstered by cooperative breeding⁵.

Systems:

Terrestrial

Threats [top]

Major Threat(s):	Past clearance for agriculture and livestock grazing has fragmented habitat, and the greatest current threat is large-scale wildfires within remnants, such as occurred in Billiatt Conservation Park. Recent declines in South Australia coincided with droughts and a sequence of extensive fires³. This population may not be able to persist or reclaim its former distribution because it is surrounded by large areas of recently burnt heath³. Following fires, mallee-heath requires 5-10 years of regeneration before it is suitable for the species^2,3. Relatively small changes in habitat quality could cause sudden local declines, and the loss of, or changes to peripheral habitat may affect core habitat⁵. Mallee-heath is used in the east of the species's range, and may mean that the strongholds of the species are at most risk from loss to single fire events¹. The species's habitat is now so fragmented that any single fire event could be catastrophic¹. The use of strategic fire-breaks has been unsuccessful in protecting subpopulations of this species³. Drought also puts pressure on the species, especially in the west of its range, where populations may be thinly distributed as a result¹, and a long term drought could result in a crash in local populations⁵. Habitat fragmentation has taken place within the area of Hattah-Kulkyne National Park and adjacent Crown land; the area is bisected by the Calder Highway and a railway line, and a swathe of habitat has been removed beneath power lines. Other developments threatening further fragmentation include plans submitted for an industrial toxic waste facility at Nowingi in an area of densely occupied habitat³, in a location which is key to the species's long-term survival⁵, and the Mildura fire plan has proposed to burn a 250 m wide strip down the west side of the Calder Highway. If suitable habitat does not become available to replace current habitat that deteriorates through old age, as compounded by drought and fires, then numbers of this species have the potential to decline sharply within decades⁴.

Major Threat(s):

Past clearance for agriculture and livestock grazing has fragmented habitat, and the greatest current threat is large-scale wildfires within remnants, such as occurred in Billiatt Conservation Park. Recent declines in South Australia coincided with droughts and a sequence of extensive fires³. This population may not be able to persist or reclaim its former distribution because it is surrounded by large areas of recently burnt heath³. Following fires, mallee-heath requires 5-10 years of regeneration before it is suitable for the species^2,3. Relatively small changes in habitat quality could cause sudden local declines, and the loss of, or changes to peripheral habitat may affect core habitat⁵. Mallee-heath is used in the east of the species's range, and may mean that the strongholds of the species are at most risk from loss to single fire events¹. The species's habitat is now so fragmented that any single fire event could be catastrophic¹. The use of strategic fire-breaks has been unsuccessful in protecting subpopulations of this species³. Drought also puts pressure on the species, especially in the west of its range, where populations may be thinly distributed as a result¹, and a long term drought could result in a crash in local populations⁵. Habitat fragmentation has taken place within the area of Hattah-Kulkyne National Park and adjacent Crown land; the area is bisected by the Calder Highway and a railway line, and a swathe of habitat has been removed beneath power lines. Other developments threatening further fragmentation include plans submitted for an industrial toxic waste facility at Nowingi in an area of densely occupied habitat³, in a location which is key to the species's long-term survival⁵, and the Mildura fire plan has proposed to burn a 250 m wide strip down the west side of the Calder Highway. If suitable habitat does not become available to replace current habitat that deteriorates through old age, as compounded by drought and fires, then numbers of this species have the potential to decline sharply within decades⁴.

Conservation Actions [top]

Conservation Actions:	Conservation actions underway: An extensive reserve system incorporates most of its remaining range, including Hattah-Kulkyne and Wyperfeld National Parks, Murray-Sunset National Park, the Big Desert Wilderness in Victoria and Ngarkat Conservation Park in South Australia. Studies into this species's population and ecology have been ongoing and a student started a PhD project on this species in 2006⁵. Conservation actions proposed: Determine the current range. Establish monitoring of known populations. Establish a fire management programme that will ensure the conservation of the species within its existing range. Re-establish the species in areas from which it has been eliminated by fire.

Conservation Actions:

Conservation actions underway:

An extensive reserve system incorporates most of its remaining range, including Hattah-Kulkyne and Wyperfeld National Parks, Murray-Sunset National Park, the Big Desert Wilderness in Victoria and Ngarkat Conservation Park in South Australia. Studies into this species's population and ecology have been ongoing and a student started a PhD project on this species in 2006⁵.

Conservation actions proposed:

Determine the current range. Establish monitoring of known populations. Establish a fire management programme that will ensure the conservation of the species within its existing range. Re-establish the species in areas from which it has been eliminated by fire.

Citation:	BirdLife International 2008. Stipiturus mallee. In: IUCN 2009. IUCN Red List of Threatened Species. Version 2009.2. <www.iucnredlist.org>. Downloaded on 21 November 2009.
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