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Carpentarian Grasswren (Amytornis dorotheae)

The Carpentarian grasswren is a small to medium-sized, Endangered grasswren restricted to sandstone outcrops and associated spinifex habitats in the Gulf of Carpentaria region of the Northern Territory and Queensland. On development sites, mature spinifex, rocky outcrops, boulder fields and unburnt refuge patches may support resident pairs, family groups or small isolated populations.

Conservation status

Commonwealth, EPBC Act 1999: Endangered.

Queensland, Nature Conservation Act 1992: Endangered.

Northern Territory, Territory Parks and Wildlife Conservation Act 1976: Endangered.

Breeding season

The species may breed at any time when conditions are suitable, but most laying is reported from November to March. It is generally sedentary during breeding and may be locally nomadic outside the breeding season.

Month values are ordered January to December. A value of 0 means not typical, 1 means occurs, and 2 means the main or peak period.

  • Breeding and nest building: Courtship and nest building usually occur from August to June, with activity possible in any month when conditions are suitable.
  • Laying and incubation: Most clutches are laid from November to March. The female incubates the eggs, but the supplied documents do not give the incubation period.
  • Young dependent with family: Young remain with the family group until the next breeding season. Timing may vary because breeding can occur outside the main laying period.
  • Local movement: The species is sedentary and territorial when breeding, but may be locally nomadic in the non-breeding season, possibly over large areas.
  • Highest clearing risk: Clearing is most likely to harm the species from November to March when laying is most common, and from August to June when courtship, nest building or dependent young may occur. Active nests and dependent young should be managed whenever detected, regardless of month.

Identification

The Carpentarian grasswren is a shy, mostly ground-dwelling bird that is usually detected by careful observation in dense spinifex among rocky terrain. It may move quickly through cover and can be difficult to see during clearing inspections.

It has a slender body, a moderately long tapered tail that is often held upright, and a rusty or rufous-chestnut back. The crown, nape and back have fine white streaking, while the face is streaked black and white. A bold black streak runs from the bill towards the edge of the breast, separating the rufous brow and facial markings from the white throat.

The breast is white. Males have tawny-buff flanks and lower belly, while females have chestnut flanks and lower belly. The tail is rusty grey.

Body length: 16 to 17 cm

Tail: Moderately long, tapered and commonly held upright

Male underparts: Tawny-buff flanks and lower belly

Female underparts: Chestnut flanks and lower belly

Identification: Field separation

Identification should be based on the combination of rusty upperparts, white facial and body streaking, a black moustachial or facial stripe, an upright rusty-grey tail, and occurrence in mature spinifex on rocky sandstone or related rocky country.

The species is most reliably separated from other small grasswrens by its restricted Gulf of Carpentaria distribution and its association with mature stands of soft spinifex on sandstone outcrops containing large boulders. The supplied documents do not provide a full comparison with other grasswren species, so photographs, high-quality descriptions and expert confirmation should be retained for unusual records.

Identification: Signs and behaviour

The species is shy and secretive, and is usually found as a pair or small family group of up to five birds. It is largely terrestrial, may shelter in rock crevices, and remains site faithful and territorial during breeding.

Nests are bulky, domed structures made from grass, spinifex needles, and dry eucalypt and acacia leaves. They are concealed in the centre of a dry spinifex clump, usually 20 to 60 cm above the ground, and are about 12 cm in diameter.

The supplied documents do not describe diagnostic tracks, scats, calls, eggshells or other field signs. Avoid disturbing dense spinifex clumps while searching for nests, and use an appropriately authorised fauna spotter catcher where handling or nest inspection is required.

Group size: Pairs or family groups of up to five birds

Nest diameter: About 12 cm

Nest height: 20 to 60 cm above ground

  • Check the edges and interior of mature spinifex clumps, rocky creeklines, boulder fields and narrow rocky slopes.
  • Record the bird's plumage, sex where possible, behaviour, group size, location and habitat condition.
  • Treat an adult repeatedly entering a spinifex clump as a possible nest indicator and establish an appropriate exclusion area before disturbance.

Distribution: National range

The Carpentarian grasswren has a restricted and disjunct range in the southern Gulf of Carpentaria region. It occurs in both the Northern Territory and Queensland, with records extending from the Northern Territory Gulf coast south-east into north-west Queensland.

In the Northern Territory, records are from sandstone outcrops within the Carpentarian and Adelaidean Systems, including Limmen National Park and the Caranbirini Conservation Reserve. In Queensland, the known range extends south-east to Westmoreland Station, with records around Boodjamulla National Park and Mount Isa.

The species is associated with the Gulf of Carpentaria region rather than a broad range of inland or northern Australian habitats. State-level records should be checked against current government databases before works commence because the supplied documents describe a restricted and fragmented distribution.

States and territories: Northern Territory and Queensland

Biogeographic setting: Sandstone outcrops within the Carpentarian and Adelaidean Systems of the Gulf of Carpentaria

Documented extent: From Limmen National Park in the Northern Territory south-east to Westmoreland Station in Queensland

Distribution: Strongholds and subpopulations

The strongest remaining population identified in the supplied material is around Mount Isa. Boodjamulla National Park supports the species in very low numbers. Wollogorang in the Northern Territory has one small isolated population, and the species has almost disappeared from much of its former Northern Territory range.

Historically, the species was reported from four broad areas: the Northern Territory Gulf region, Wollogorang, Boodjamulla National Park and Mount Isa. Targeted surveys in some former areas had produced no records for a decade at the time of the cited project report.

Largest reported remaining population: Mount Isa area

Reported isolated population: Wollogorang, Northern Territory

Former range: More than 2.8 million hectares across four broad areas, according to the cited project report

Population size: No national population estimate is provided in the supplied documents

Trend: Declining or locally extirpated in areas affected by extensive and repeated wildfire

Habitat: Vegetation and terrain

Habitat is defined by mature, dense spinifex combined with rocky terrain and, in some areas, open woodland or sparse shrubs. Unburnt or long-unburnt patches are particularly important because birds commonly abandon burnt habitat unless substantial spinifex refuges remain.

The principal habitat is dense mature soft spinifex, especially Triodia pungens, on dissected rocky sandstone ranges, slopes and outcrops. The species also occurs in Eucalyptus leucophloia low open woodland with Triodia longiceps or Triodia modesta and sparse acacia on siltstone ranges and undulating quartzitic plains.

Rocky creeklines, large boulders, rugged slopes and rock crevices provide structural cover within or beside spinifex habitat. Open woodland and grassland communities with structural complexity are also identified as habitat for the species in the Gulf region.

Key grass: Mature soft spinifex, especially Triodia pungens

Other recorded spinifex: Triodia longiceps and Triodia modesta

Associated trees: Eucalyptus leucophloia, with occasional sparse Corymbia dichromophloia

Other associated plants: Sparse acacias and other shrubs

Key terrain: Sandstone and siltstone ranges, rocky outcrops, quartzitic plains, boulders and rocky creeklines

Habitat: Fire condition

Long-unburnt hummock grass is preferred, although the species uses a mosaic of habitat conditions rather than uniformly old vegetation. A substantial unburnt pocket of spinifex may allow birds to remain near recently burnt areas, but extensive fire can remove habitat and restrict movement between occupied sites.

There is no elevation limit or temperature threshold in the supplied documents. Habitat assessment should therefore focus on vegetation maturity, spinifex continuity, recent fire history, rocky cover and connection between suitable patches.

  • Map mature spinifex, recent fire scars, unburnt pockets, rocky outcrops and boulder fields before clearing.
  • Retain connected patches of mature spinifex around rocky features wherever project design allows.
  • Do not treat recently burnt ground as unsuitable without checking adjacent unburnt spinifex, rocky refuges and recolonisation potential.

Foraging habitat: Diet

The Carpentarian grasswren forages mainly on or close to the ground within dense spinifex and rocky cover. Its diet combines invertebrates with seeds from grasses, sedges and other plants.

Recorded food includes insects such as beetles, spiders, and seeds from dicot plants and monocot plants, including grasses and sedges. Soft spinifex seeds are specifically identified as an important food resource, and annual dry-season fires may reduce their availability.

The bird is likely to feed within mature spinifex clumps and around rocky cover, but the supplied documents do not provide a measured feeding radius, daily movement distance or quantified home range.

Recorded animal prey: Insects, including beetles, and spiders

Recorded plant food: Seeds of dicots, grasses and sedges

Important seed source: Soft spinifex

Foraging range: No measured foraging range is provided in the supplied documents

  • Retain mature spinifex seed sources and undisturbed ground cover around rocky outcrops.
  • Avoid removing or repeatedly burning connected foraging patches, particularly where spinifex seed availability has already been reduced by fire.
  • Inspect dense spinifex and rocky edges for birds moving on foot before machinery enters the area.

Foraging habitat: Foraging structure

Suitable foraging habitat includes mature hummock grass with open spaces between clumps, rocky ground, boulder edges, rocky creeklines and sparse shrub cover. The combination of cover and access to seed-bearing grasses and invertebrate prey appears more important than any single plant species.

Breeding habitat: Breeding biology

Breeding occurs in mature spinifex clumps within rocky habitat. The species is territorial when breeding, and nests are concealed above the ground inside dry spinifex.

Courtship and nest building usually occur from August to June, although breeding may occur in any month when conditions are suitable. Most eggs are laid from November to March, and one brood is produced each season.

The female incubates the eggs. Young remain with the family group until the next breeding season.

Courtship and nest building: Usually August to June, with breeding possible in any month when conditions are suitable

Main laying period: November to March

Clutch size: 2 to 3 eggs

Incubation: The female incubates the eggs; the supplied documents do not give an incubation period

Broods: One brood per season

Age at maturity: Not stated in the supplied documents

Lifespan: Not stated in the supplied documents

Breeding habitat: Nest habitat

Nests are built in the centre of dry spinifex clumps, usually 20 to 60 cm above the ground. They are made from grass, spinifex needles, and dry eucalypt and acacia leaves, and have a bulky domed form.

Breeding territories are small but well spaced, with an historical description of about one territory per kilometre of hillside. Stable breeding territories have also been estimated at about 1.5 km². These figures should be treated as broad field context rather than a substitute for site-specific observations.

Nest position: Concealed in the centre of a dry spinifex clump, 20 to 60 cm above ground

Nest form: Bulky and domed

Breeding territory spacing: About one territory per kilometre of hillside in one reported description

Estimated stable territory size: About 1.5 km²

  • Before clearing, inspect mature dry spinifex clumps within occupied or potentially occupied rocky habitat for concealed domed nests.
  • Retain nest-bearing clumps and nearby cover until breeding activity has finished and dependent young have dispersed, subject to approval conditions.
  • Record the location of nests and repeated adult movements, and provide the information to the project ecologist and fauna spotter catcher.

Sheltering habitat: Ground cover and rock refuges

Shelter is provided by dense spinifex, rugged rocky terrain, boulders and rock crevices. These features can reduce exposure to predators and fire, and may allow birds to persist beside recently burnt areas when enough unburnt cover remains.

The species uses dense mature spinifex and rugged sandstone terrain. It sometimes shelters in rock crevices, and large boulders within spinifex habitat provide additional cover.

Birds normally abandon burnt areas unless substantial unburnt pockets of spinifex remain nearby. Unburnt pockets within rocky country should therefore be treated as potential refuge habitat during fire planning, clearing and construction.

Known shelter features: Dense spinifex, large boulders, rugged terrain and rock crevices

Known refuge condition: Substantial unburnt spinifex pockets near burnt areas

Burrows and hollows: No burrows, tree hollows or other measured shelter structures are reported in the supplied documents

  • Retain mature spinifex clumps, boulder fields, rocky creeklines and accessible rock crevices where they occur in or beside proposed works.
  • Avoid placing spoil, access tracks, laydown areas or infrastructure across unburnt spinifex pockets within otherwise burnt country.
  • Use recent fire mapping with field checks because a burnt polygon may contain small unburnt refuges that are not visible at broad mapping scales.

Sheltering habitat: Nest refuge

The nest is also a shelter structure for eggs and young. It is concealed within a dry spinifex clump, rather than in a tree hollow, burrow or artificial structure.

Nest diameter: About 12 cm

Nest height: 20 to 60 cm above ground

Threats: Fire and habitat loss

Fire is the main documented threat to the Carpentarian grasswren. Clearing, mining disturbance and loss of connected mature spinifex can add pressure by removing breeding habitat, foraging cover and fire refuges.

Frequent, extensive or hot fires remove mature spinifex, reduce seed availability and can make burnt areas unsuitable. Annual dry-season fires may reduce soft spinifex seed supply. Fire has been linked with the extirpation of the Borroloola subpopulation, major reductions in other Northern Territory subpopulations and the historical separation of localities.

High fuel loads over large areas, altered fire management and introduced pasture grasses such as buffel grass may increase fire frequency, extent or intensity. Wildfires in 2011 and 2012 were reported to have substantially affected habitat around Boodjamulla National Park and Mount Isa.

  • Avoid broad hot fires late in the dry season across occupied or potentially occupied spinifex habitat.
  • Plan a balanced mosaic of burns that retains mature spinifex and substantial unburnt refuges.
  • Map fire scars and inspect remaining unburnt pockets before approving clearing or access through rocky spinifex country.

Threats: Clearing, construction and fragmentation

Clearing of mature spinifex, rocky outcrops, boulder fields and rocky creeklines can remove habitat directly. Roads, tracks, pads, utility corridors and mine infrastructure may also divide occupied habitat and restrict movement across burnt or cleared ground.

The species is sedentary and site faithful during breeding, although it may be locally nomadic outside the breeding season. Its ability to disperse across burnt areas is limited, so loss of connected unburnt habitat may prevent movement between suitable patches.

  • Complete targeted habitat assessment before clearing in the known range, including mature spinifex, rocky slopes, outcrops, boulders and unburnt patches.
  • Keep clearing footprints narrow and avoid unnecessary removal of mature spinifex between rocky habitat patches.
  • Schedule clearing outside the main laying period where practicable, and apply nest and dependent-young controls whenever active breeding is detected.
  • Use fauna spotter catchers familiar with cryptic ground-dwelling birds during vegetation removal in suitable habitat.

Threats: Predators and disturbance

Feral cats are identified as a threat. Disturbance from mining and bird watchers has also been identified as a possible pressure, particularly around small and isolated populations.

The supplied documents do not identify disease, road mortality or hydrology change as confirmed threats for this species. These risks should still be considered where a project changes access, drainage, fire behaviour or predator activity around occupied habitat.

Confirmed or documented threat: Feral cats are identified as a threat; mining and bird-watching disturbance are identified as possible pressures

Disease: No disease threat is identified in the supplied documents

Hydrology change: No specific hydrology threat is identified in the supplied documents

  • Control project-related food waste and avoid creating cover or access routes that may increase feral cat activity near occupied habitat.
  • Keep non-essential personnel away from active nests and repeated breeding territories.
  • Record any cat sightings, carcasses, predation events or unusual mortality during project monitoring.

Survey methodology: 1. Habitat-targeted diurnal searches

Survey effort should target mature spinifex on rocky sandstone and siltstone terrain, especially areas with boulders, rocky creeklines and long-unburnt hummock grass. The supplied documents do not specify a survey guideline or minimum number of transects, nights, hours or trap nights, so the project ecologist should set and justify effort in the survey plan and approvals.

Search systematically through mature stands of Soft Spinifex, including Triodia pungens and areas with Triodia longiceps or T. modesta, on rocky outcrops, ranges, slopes, creeklines and quartzitic plains.

Prioritise long-unburnt patches, boulder fields, rock crevices and intact spinifex clumps because the species is terrestrial, shy and secretive, and may shelter in rock crevices.

Conduct searches when birds are most likely to be active and visible, using repeated visits where conditions or detectability are poor.

Record all grasswren observations, calls, tracks or other signs with coordinates, habitat condition, recent fire history and the size of the occupied or potentially occupied patch.

Adult size: 16 to 17 cm

Typical social group: Pairs or small family groups of up to 5 birds

Typical breeding territory: About one territory per 1 km of hillside, with an estimated stable breeding territory of about 1.5 km² reported from project information

  • Do not treat an absence during one visit as evidence that the species is absent.
  • Keep observers quiet and move slowly along the edge and through suitable habitat so birds are not missed or flushed from dense spinifex.
  • Map the extent of mature spinifex and unburnt refuges separately from recently burnt areas.

Survey methodology: 2. Acoustic monitoring

Use automated acoustic recorder units and targeted listening where dense spinifex, rugged terrain or low abundance is likely to reduce visual detection.

Place recorders across retained mature spinifex, rocky refuges, recently burnt edges and likely movement routes, and retain the deployment design and dates in the survey report.

Use a species-specific acoustic recogniser only where it has been validated for the project area, and have records checked by an experienced ornithologist.

Schedule repeat deployments across suitable conditions and seasons because the species is sedentary but can be locally nomadic outside the breeding season.

Available acoustic approach: Acoustic recorder units and an acoustic recogniser have been used to improve detection of Carpentarian Grasswren vocalisations

Breeding period: Courtship and nest building usually occur from August to June, with breeding possible in any month when conditions are suitable

  • Treat an acoustic detection as a record requiring location, date, time, recorder identifier and verification status.
  • Do not use a recorder deployment with no detection to clear habitat without considering fire history, habitat condition, terrain and the limitations of the equipment.
  • Avoid excessive observer noise and machinery during active searches and acoustic deployments.

Survey methodology: 3. Nest and habitat feature searches

Inspect mature spinifex clumps, rock crevices, boulder fields and rocky creeklines for nests, birds and signs before any clearing or ground disturbance.

Search for concealed domed nests in the centre of dry spinifex clumps, including clumps close to proposed access tracks, work areas and machinery movements.

Where works are staged, repeat the pre-clearance inspection immediately before each stage because birds can remain in retained habitat and may move locally after disturbance.

Record the location and condition of every suitable spinifex patch, nest, refuge and burnt or unburnt connection between retained areas.

Nest form: Bulky domed nest, about 12 cm in diameter

Nest materials: Grass, spinifex needles and dry eucalypt or acacia leaves

Nest position: Usually concealed in the centre of a dry spinifex clump, 20 to 60 cm above ground

Clutch size: Usually 2 to 3 eggs

  • Do not enter or dismantle a suspected nest to confirm occupancy.
  • Treat a suspected active nest, dependent young or family group as a stop-work matter until the project ecologist has assessed the risk and the fauna management plan has been applied.
  • Avoid trapping unless a suitably authorised wildlife professional confirms that trapping is necessary, lawful and appropriate for this species and habitat.

Survey methodology: Minimum effort and reporting

  • Use a written survey design that states the search area, transect or search route, number and duration of visits, acoustic deployment effort, weather and ground conditions, observer qualifications and detection limitations.
  • Time surveys to include the breeding period from August to June where practicable, and add repeat visits when fire, weather, dense vegetation or low abundance is likely to reduce detection.
  • Do not invent a minimum number of nights, hours, transects or trap nights where the applicable state or project survey guideline has not been identified.
  • Submit verified records and negative survey results, where required, to the relevant state or territory wildlife database, including coordinates, date, observer, method, habitat, fire history and evidence supporting the record.
  • Provide all records, photographs, acoustic files, maps and survey limitations to the approval holder and the relevant government regulator.

Before habitat disturbance: Avoid and minimise habitat loss

Treat all mature spinifex on rocky outcrops and associated boulder habitat as potential Carpentarian Grasswren habitat until survey and impact assessment show otherwise. The species is endangered nationally and in the Northern Territory and Queensland, and it may abandon burnt areas unless substantial unburnt spinifex remains nearby.

Redesign the disturbance footprint to retain mature Soft Spinifex, rocky outcrops, boulders, rocky creeklines, rock crevices and connected unburnt patches.

Retain large, continuous areas of long-unburnt hummock grass and avoid isolating small spinifex patches between cleared areas, roads or construction compounds.

Keep machinery, laydown areas, access tracks, spoil and drainage works out of retained spinifex and rocky refuges.

Avoid broadscale burning or slashing of spinifex, particularly where fire would remove the unburnt pockets used by the species.

Primary habitat: Mature Soft Spinifex, especially Triodia pungens, on sandstone outcrops with large boulders

Additional habitat: Eucalyptus leucophloia low open woodland with Triodia longiceps or T. modesta, sparse acacia, rocky creeklines and boulders

Fire response: Birds normally abandon burnt areas unless substantial unburnt spinifex pockets remain nearby

  • Map and fence retained habitat before clearing begins.
  • Use existing disturbed access routes where possible.
  • Keep firebreaks, temporary works and construction traffic outside retained habitat unless the approved plan specifically allows access.

Before habitat disturbance: Approvals and fauna planning

Check whether the proposed action is likely to have a significant impact on this EPBC Act listed endangered species and obtain ecological advice on whether an EPBC referral or approval is required.

Confirm the applicable state or territory threatened species permits, clearing approvals, wildlife licences and fauna spotter catcher requirements before works start.

Prepare a species-specific fauna management plan covering survey results, retained habitat, exclusion zones, staged clearing, stop-work triggers, animal handling, relocation, injury response, fire controls and reporting.

Consult the relevant Northern Territory or Queensland environment authority where the species or its habitat is recorded, and apply any additional approval conditions.

EPBC Act status: Endangered

Northern Territory status: Endangered

Queensland status: Endangered

  • Do not start clearing on the assumption that a state approval replaces EPBC Act obligations.
  • Name the authorised ecologist, fauna spotter catcher, wildlife carer and veterinary contact in the fauna management plan.
  • Brief all operators on the species, its habitat, exclusion zones and the instruction to stop when directed by the fauna spotter catcher.

Before habitat disturbance: Pre-clearance preparation

Complete a pre-clearance inspection of every work area and each stage of a staged clearing program, focusing on mature spinifex clumps, rock crevices, boulders, rocky creeklines, nests and family groups.

Mark retained habitat, suspected nests, occupied areas, exclusion zones, access routes and the boundary of the approved disturbance area before machinery enters the site.

Install exclusion fencing where it can protect retained spinifex and rocky refuges from machinery, vehicles, people, domestic animals and stored materials.

Schedule clearing to avoid the most sensitive conditions identified by the ecologist, including active nests, dependent young, family groups and periods when fire risk is high.

  • Use a staged approach that clears only the area needed for the next construction activity.
  • Confirm that all spotter catchers hold the required authority and have suitable experience with threatened small terrestrial birds.
  • Reinspect any area affected by fire, changed access, prolonged delay or altered design before clearing resumes.

During habitat disturbance: Daily controls and machinery coordination

The fauna spotter catcher must have authority to stop machinery and must remain involved while clearing or other ground disturbance occurs in potential habitat. The priority is to prevent birds being crushed, trapped, driven into unsuitable burnt habitat or separated from retained spinifex.

Inspect the work area each day before machinery starts, including retained habitat edges, access routes, stockpiles, rock piles and any spinifex disturbed since the previous inspection.

Keep the fauna spotter catcher in direct communication with the machine operator and within a position where the operator can see or immediately receive a stop instruction.

Clear in small, sequential sections from the already disturbed edge towards retained habitat, allowing the spotter catcher to check each section before and during disturbance.

Maintain exclusion fencing, signage and marked boundaries throughout the work, and replace damaged controls immediately.

  • Stop machinery when the spotter catcher signals, when a bird is seen, when a nest or dependent young is found, or when clearing moves outside the approved footprint.
  • Do not drive through retained spinifex, boulder fields or rocky creeklines to recover machinery or materials without ecological approval.
  • Keep dogs, unauthorised people, vehicles and construction noise away from retained habitat and any relocated bird.

During habitat disturbance: Animal response and handling

If a Carpentarian Grasswren is found, stop work, keep people quiet and allow the bird a safe route to nearby retained mature spinifex where this can occur without further disturbance.

Do not chase, catch or handle the bird unless the authorised fauna spotter catcher or another appropriately authorised wildlife professional determines that handling is necessary.

Relocate a bird only to nearby retained habitat identified in the fauna management plan, with suitable mature spinifex, rocky refuge and connection to other retained habitat.

Take an injured, exhausted or contaminated bird to the nominated veterinarian or wildlife carer as soon as practicable, following the applicable wildlife permit and animal welfare requirements.

Record the species, number of birds, location found, response, destination, condition, time, handlers and outcome.

  • Do not relocate a bird across a cleared or recently burnt area when a safer route or nearby refuge is available.
  • Do not disturb an active nest or remove eggs or young unless specifically authorised and directed by the relevant wildlife authority.
  • Keep handling time to the minimum needed for animal welfare, identification and lawful relocation.

During habitat disturbance: Stop-work triggers and habitat features

Stop work immediately if a Carpentarian Grasswren, suspected active nest, dependent young, family group, injured bird or previously unmapped occupied habitat is found within or next to the disturbance area.

Stop work if fire, machinery or sediment movement threatens retained mature spinifex, boulders, rocky creeklines or known refuge patches.

Have the ecologist reassess the area and approve a revised method, exclusion zone or relocation response before work restarts.

Treat spinifex clumps, rock crevices and boulders as habitat features for this species, even though hollow-bearing trees, logs and wetlands are not identified as its characteristic habitat in the supplied documents.

Known primary threat: Frequent or extensive fire, including hot late dry season fires

Additional reported threats: Mining and birdwatcher disturbance are suspected threats, and feral cats are reported as a threat

Fire effect: Annual fires can reduce Soft Spinifex seed availability, food supply and habitat suitability

  • Do not burn accumulated fuel or use hot late-dry-season fire near occupied or retained habitat without approval under the fire management plan.
  • Prevent introduced pasture grasses, including buffel grass where present, from increasing fuel continuity around retained spinifex.
  • Record every stop-work event, its cause, the area affected, the decision-maker and the corrective action.

After habitat disturbance: Post-clearance checks

Post-clearance work must confirm that no birds, nests or retained habitat features were missed and that construction controls have not increased fire, access or predation risks. Monitoring should focus on retained mature spinifex and the condition of unburnt refuges around the disturbance area.

Inspect the cleared area and the retained habitat edge after each clearing stage for injured birds, nests, trapped fauna, damaged exclusion fencing and unauthorised encroachment.

Check that no machinery, spoil, waste, access track or drainage discharge has entered retained spinifex, rocky outcrops, boulder fields or rocky creeklines.

Repeat checks after major construction changes, fires, severe weather, prolonged work stoppages and any incident involving a bird.

  • Document the final cleared footprint against the approved plans.
  • Remove temporary materials and fencing only when the fauna management plan and ecologist confirm that removal will not expose retained habitat to damage.
  • Report any mortality, injury, nest disturbance, fire escape or unauthorised clearing to the approval holder and regulator within the required timeframe.

After habitat disturbance: Monitoring and reporting

Monitor occupied or potentially occupied retained habitat using the approved survey method, with repeat visual searches and acoustic recorder deployments where those methods were included in the survey design.

Compare post-work records with pre-clearance records for birds, mature spinifex extent, unburnt refuge patches, fire scars and habitat connectivity.

Continue monitoring for the period required by the approval, fauna management plan or offset condition, and review methods if detection is poor or habitat condition declines.

Submit verified records to the relevant state or territory wildlife database and provide the regulator with maps, effort, detections, incidents, handling outcomes and corrective actions.

  • Report negative results with the area searched, effort, conditions and detection limitations.
  • Keep acoustic files, photographs, spatial data, fauna registers and approval correspondence with the project environmental records.
  • Escalate a decline in detections, loss of unburnt refuges or repeated fire impacts to the project ecologist and approval holder.

After habitat disturbance: Maintain controls and offsets

Maintain exclusion fencing, access controls, fire controls and weed management around retained habitat until the site is stable and the approved maintenance period ends.

Apply any approved offset, compensatory habitat or conservation condition for residual impacts, with the area, tenure, management actions and monitoring requirements recorded in the project documents.

Use offset or compensatory habitat that supports mature spinifex, rocky refuges and unburnt connections rather than relying only on cleared-site revegetation.

  • Do not count recently burnt or highly fragmented areas as equivalent replacement habitat without ecological evidence and approval.
  • Inspect offset or compensatory areas for fire, buffel grass, feral cats, access damage and loss of mature spinifex.
  • Record management actions and outcomes against the approval conditions.

Rehabilitation actions: Rebuild species habitat

Rehabilitation should rebuild the habitat structure used by the Carpentarian Grasswren rather than treating the site as general revegetation. The main targets are mature spinifex, rocky refuge structure, connected unburnt habitat and a fire regime that avoids extensive hot fires.

Protect and encourage recovery of mature Soft Spinifex, especially Triodia pungens, in suitable rocky areas and around retained boulders and outcrops.

Where the approved rehabilitation method permits planting or assisted regeneration, use locally appropriate native grasses and shrubs that match the surrounding spinifex community, including suitable Triodia, Eucalyptus leucophloia and sparse acacia associations where they naturally occur.

Retain or reinstate naturally occurring boulders, rocky creekline structure and rock crevices where these features were removed or displaced by the works.

Do not introduce dense pasture grasses or other plants that increase continuous fuel and fire intensity.

Key habitat target: Dense mature spinifex on rocky sandstone or siltstone terrain with boulders and rocky refuges

Associated vegetation: Eucalyptus leucophloia low open woodland, sparse acacia and Triodia grasslands where naturally present

  • Use local reference sites to set the target structure and species mix.
  • Keep rehabilitated patches connected to retained mature spinifex and unburnt rocky refuges.
  • Do not install hollows, nest boxes, logs or wetlands as substitutes for the species' documented spinifex and rocky habitat unless another fauna objective requires them.

Rehabilitation actions: Fire, weeds and predators

Develop a fire management program that maintains a mosaic of unburnt and differently aged spinifex while reducing the extent and incidence of hot fires late in the dry season.

Use planned, low-risk fire management only under the approved fire plan and retain substantial unburnt spinifex pockets near occupied or rehabilitating habitat.

Control buffel grass and other introduced pasture grasses where they increase fuel continuity or allow fire to burn deeper into rocky refuges.

Manage feral cats and other introduced predators in accordance with the approved site pest management plan.

Recommended fire direction: Reduce hot late dry season fires and introduce a balanced mosaic of burns

Fire-related food issue: Annual fires can reduce the availability of Soft Spinifex seed eaten by the species

  • Do not apply annual or extensive dry-season burning across rehabilitated habitat.
  • Map fire scars after every fire and inspect whether mature spinifex, seed availability and rocky refuges remain.
  • Coordinate fire planning with land managers, pastoralists and relevant government agencies where habitat extends beyond the project boundary.

Rehabilitation actions: Success measures and monitoring

Set measurable rehabilitation targets for the area of mature or recovering spinifex, the number and condition of retained rocky refuges, the extent of connected unburnt habitat, weed cover, fire severity and evidence of unauthorised access.

Monitor rehabilitated and reference areas using repeat habitat assessments, visual searches and acoustic recorder deployments where included in the approved monitoring design.

Record grasswren detections, family groups, nesting evidence, habitat use and movement between rehabilitated and retained patches without disturbing nests or birds.

Continue monitoring until the agreed success measures are met or the approval requires a longer period, and revise fire, weed or predator controls when results fall below target.

  • Report monitoring effort and results to the relevant state or territory wildlife database and the approval authority where required.
  • Use consistent locations, methods and seasonal timing so results can be compared between years.
  • Treat renewed occupation by the species as one indicator of recovery, not the only success measure.

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