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Shy Heathwren (Hylacola cauta)

The Shy Heathwren is a small, ground-foraging heathwren of dense shrub and heath understorey in mallee woodlands, shrublands and heathland across southern Australia. It is vulnerable to clearing, fragmentation, inappropriate fire and predation because it nests and forages close to the ground, and because suitable dense understorey can be lost rapidly during construction or fire management.

Conservation status

Commonwealth, EPBC Act 1999: Vulnerable.

New South Wales, Biodiversity Conservation Act 2016: Vulnerable.

Breeding season

The species is generally resident or sedentary in the information supplied, with no long-distance seasonal migration described. Breeding occurs from July to December, and fledglings remain dependent for six to eight weeks.

Months are January to December. A value of 2 marks the months of greatest expected activity or project risk based on the supplied breeding information, not a quantified monthly detection rate.

  • Breeding: Breeding season is July to December. The documents do not identify a narrower peak within that period.
  • Nesting and young in nest: Nests are built during the July to December breeding season. Eggs are incubated by the female and nestlings are fed by both parents.
  • Dependent fledglings: Fledglings remain dependent for six to eight weeks. Young from late-season nests may remain dependent into January or February.
  • Highest clearing risk: Clearing risk is highest from July to December because nests and dependent young may be present. Risk can continue into January and February where late-season fledglings remain dependent for six to eight weeks.

Identification

The Shy Heathwren is a small, secretive bird that usually stays within dense shrubs or heath close to the ground. It is more often detected by careful observation of movement through cover than by prolonged views in open areas.

Adults are brown above and pale below, with bold dusky streaking on the underparts. A prominent white supercilium, rich rufous upper tail-coverts, a blackish tail with white tips, and a white patch at the base of the primaries are useful field marks. The tail is long and commonly held strongly cocked, similar to a fairy-wren.

The bill is short, straight and stout. The legs are relatively long. The far south-western NSW guide describes the bird as brown, heavily streaked on the breast, with a white eyebrow and bright rufous-chestnut rump and tail-coverts.

Length: About 11.5 to 14 cm.

Weight: About 15 g.

Identification: Sex and similar species

Males generally have cleaner, paler underparts with heavier dusky streaking. Females are buffier below and less heavily streaked.

The closest practical confusion is the Chestnut-rumped Heathwren. The Shy Heathwren has a whiter and more prominent supercilium, cleaner and whiter male underparts, and a distinctive rufous-chestnut rump and tail-coverts. On Kangaroo Island, the Chestnut-rumped Heathwren does not occur, so confusion is less likely.

  • Do not identify a bird from brown plumage alone. Check the white eyebrow, heavy breast streaking, rufous rump and strongly cocked tail.
  • Treat a small streaked bird flushed from dense heath as unconfirmed unless the eyebrow and rump colour are visible or a suitably experienced observer confirms the identification.

Identification: Field signs and detection

The species forages and nests at ground level, so birds may be seen moving briskly through shrubs, tussocks and ground cover. It may occur singly or in pairs.

Dome-shaped nests are usually concealed near the ground in grass, shrubs or other dense cover. They are made from grass, leaves, bark, roots and twigs, with a protruding entrance. No reliable species-specific tracks, scats, sloughs or other non-visual signs are described in the supplied documents.

The bird is shy and secretive. General heathwren survey practice is to walk transects through potential habitat, stop periodically to listen for calls, and use call playback only by experienced personnel and under an approved survey method. Surveys are best undertaken in spring, early in the morning, in little or no wind.

  • Inspect dense ground cover and low shrubs carefully before vegetation removal.
  • If a bird is flushed, record the exact cover type, direction of flight and point where it drops back into vegetation.
  • Do not disturb a suspected nest to obtain a closer identification.

Distribution: National range

The Shy Heathwren is endemic to Australia and has several recognised subspecies. The supplied evidence covers the mainland mallee range and the isolated Kangaroo Island subspecies, rather than providing a single current population estimate for the whole species.

The nominate subspecies occurs in South Australia, Victoria and far south-western New South Wales. The central NSW subspecies occurs in central New South Wales, and the western subspecies occurs in Western Australia. The Kangaroo Island subspecies is restricted to Kangaroo Island, South Australia.

Within the mainland range, the species is associated mainly with mallee country, including the Murray Darling Depression bioregion and adjoining mallee areas. In New South Wales, relevant habitat includes far south-western mallee woodlands with shrub, grass or spinifex understorey.

  • South Australia: mainland mallee and Kangaroo Island.
  • Victoria: mallee regions, including the Victorian Mallee.
  • New South Wales: far south-western and central mallee regions.
  • Western Australia: the range of the western subspecies.

Distribution: Strongholds and subpopulations

The Kangaroo Island subspecies is concentrated in coastal and sub-coastal mallee along the south coast, ironstone plateau mallee heath in Flinders Chase National Park, and scattered mallee pockets elsewhere on the island. Post-fire surveys recorded most individuals in the Flinders Chase National Park area on western Kangaroo Island.

For project assessment, records from intact mallee, dense heath and recently burnt areas should all be treated as relevant. The species can use recently burnt habitat as vegetation recovers, but very severe fire can remove the dense cover it requires.

Distribution: Population and trend

A whole-species estimate is not provided. The available estimate for the Kangaroo Island subspecies is of low reliability and follows the severe 2019 to 2020 fires. Reporting rates in mallee surveys were higher within intact Key Biodiversity Areas than in fragmented areas outside them.

Kangaroo Island extent of occurrence: Estimated at 5,400 km2 and considered stable after the 2019 to 2020 fires.

Kangaroo Island area of occupancy: Estimated at 520 km2 immediately after the 2019 to 2020 fires.

Kangaroo Island mature individuals: Estimated at about 1,100 in the wild, with a declining trend and low reliability.

Fire impact on Kangaroo Island range: About 67% of the modelled range intersected the 2019 to 2020 fire extent; 51% was burnt at high to very high severity and a further 11% at low to moderate severity.

Post-fire survey detection: Recorded at 24% of transect surveys in unburnt patches and 20% in burnt areas during surveys from May 2020 to April 2021.

Habitat: Habitat types

Shy Heathwrens require dense low vegetation in mallee woodlands, shrublands or heathland. The most important habitat feature is a continuous, dense shrub or heath understorey that provides cover at and near ground level.

Suitable habitat includes coastal and sub-coastal mallee, inland mallee heath, dry heath and mallee woodland with a dense shrub understorey. In far south-western NSW, mallee understorey may include spinifex, mixed shrubs, grasses and herbs.

Understorey composition varies with soil type, landform and fire history. Relevant structural features include dense shrubs, grass tussocks, spinifex, leaf litter, fallen branches and other woody debris.

  • Retain continuous patches of dense heath and shrub understorey within and beside the work area.
  • Include unburnt vegetation near burnt areas in pre-clearance habitat assessments because it can provide refuge and sources for recolonisation.
  • Do not assume recently burnt vegetation is of no value. Habitat suitability can increase as dense understorey regenerates.

Habitat: Fire age and habitat condition

The species is commonly associated with mallee that has been burnt within the previous 10 years, but habitat response varies with fire severity, vegetation type and rainfall. Large, high-severity fires can make extensive areas unsuitable by removing dense cover.

Habitat critical to the survival of the Kangaroo Island subspecies includes all potential suitable habitat, especially unburnt patches within or beside fire-affected areas and areas expected to become suitable again as vegetation recovers.

  • Avoid clearing or burning unburnt refuge patches beside recently burnt ground.
  • Maintain the net amount of suitable mallee and heath habitat where disturbance cannot be avoided.
  • Record fire history and vegetation structure, not just the presence or absence of birds.

Habitat: Elevation and climate

The supplied documents do not give an elevation limit for the species. They describe occurrence by vegetation type and region rather than altitude. On Kangaroo Island, the species occurs in coastal mallee and inland ironstone plateau mallee heath.

Foraging habitat: Diet and feeding behaviour

Shy Heathwrens forage mainly on the ground within dense shrubs, heath, tussocks and leaf litter. They move through cover rather than feeding high in the mallee canopy.

The diet consists mainly of insects and other ground-dwelling invertebrates, with occasional seeds. Birds forage on the ground and may fossick through leaf litter, grass tussocks, spinifex and low shrubs.

Food availability is likely to depend on intact ground cover, litter and a diverse shrub and ground layer. The supplied documents do not identify particular plant species that form a required food source.

Primary food: Insects and other ground-dwelling invertebrates.

Occasional food: Seeds.

Foraging height: Predominantly on the ground and within low vegetation.

  • Retain leaf litter, fallen branches, tussocks, spinifex and low shrubs in potential habitat.
  • Avoid unnecessary vehicle movement through dense understorey and ground cover.
  • Inspect recently burnt areas and adjoining unburnt cover because birds may forage in burnt vegetation while relying on nearby cover for protection.

Foraging habitat: Foraging area

No home-range size or regular foraging distance is provided. Because the species remains close to dense cover, clearing should be assessed across the full patch of suitable understorey, not only at the point where a bird is observed.

Breeding habitat: Breeding biology

Breeding occurs in dense low vegetation during the warmer part of the year. Nests are close to the ground and can be difficult to detect before clearing.

Pairs build a dome-shaped nest, usually close to the ground. The nest is made from grass, leaves, bark, roots and twigs, and usually has a protruding entrance. The female incubates the eggs and both parents feed the nestlings.

The incubation period and nestling period are not known. Fledglings remain dependent for six to eight weeks, so breeding-related disturbance can continue after young leave the nest.

Breeding season: July to December.

Nest type: Dome-shaped, usually near the ground, with a protruding entrance.

Clutch size: Two to four eggs, usually three.

Egg information: Eggs are described in the supplied field guide as freckled and pinkish.

Incubation: Duration unknown; only the female incubates.

Nestling period: Duration unknown; both parents feed the nestlings.

Fledgling dependence: Six to eight weeks.

Age at maturity: Not stated in the supplied documents.

Lifespan: Not stated in the supplied documents.

Breeding habitat: Breeding habitat features

Breeding habitat consists of dense shrub or heath understorey in mallee woodland, shrubland or heathland. Nests are concealed in or beside grass tussocks, shrubs and other low vegetation.

The ground-level position of the nest makes it susceptible to slashing, grading, vehicle movement, fire, livestock trampling and removal of dense understorey.

  • Search dense shrubs, grass tussocks and the ground layer before clearing during July to December.
  • Establish no-go areas around any confirmed nest and obtain species-specific advice before work resumes.
  • Use experienced fauna spotter catchers because nests may be concealed and adults may remain hidden until approached closely.

Sheltering habitat: Cover and refuge

The Shy Heathwren shelters in dense low vegetation and spends much of its time close to the ground. It does not use tree hollows, caves or burrows according to the supplied documents.

Important shelter includes dense shrubs, heath, grass tussocks, spinifex, leaf litter, fallen branches and woody debris in mallee vegetation. Unburnt patches within or beside recently burnt areas may provide refuge after fire.

The species' ground-dwelling behaviour increases exposure to cats and other predators when fire or clearing removes cover. Retaining connected understorey is therefore important during and after works.

Known shelter type: Dense ground and shrub cover.

Known hollow, burrow or den use: None described in the supplied documents.

Nest height: Usually near the ground.

  • Retain dense ground and mid-storey cover wherever practicable.
  • Protect unburnt refuge patches from back-burning, mechanical removal, stock access and construction traffic.
  • Leave fallen logs, branches, litter and tussocks in retained habitat unless their removal is required for a specific safety reason.

Sheltering habitat: Refuge management during works

Where clearing is unavoidable, retain connected patches of suitable understorey between the work footprint and nearby habitat. Avoid isolating a small patch surrounded by bare ground, roads or firebreaks.

After fire, weed invasion and predation can increase the pressure on birds using remaining cover. Keep refuge sites free from avoidable disturbance and manage access by cats, pigs, livestock and machinery.

  • Mark retained refuge vegetation before machinery enters the site.
  • Use clearly defined access routes to prevent repeated crushing of ground cover.
  • Inspect retained patches for nests and birds before each new stage of clearing.

Threats: Clearing and fragmentation

The main project risks are removal or fragmentation of dense mallee and heath understorey, poorly planned fire activities, and disturbance or mortality of ground-dwelling birds and nests. Threats can interact, particularly after fire when cover is reduced and cats can hunt more effectively.

Vegetation clearing removes foraging, sheltering and breeding habitat. Historical agricultural clearing has reduced habitat, and further removal of roadside vegetation, mallee remnants or dense heath can cause additional habitat loss and fragmentation.

Fragmented patches are more exposed to fire, predators, weeds and edge disturbance. A bird observation outside the proposed footprint does not demonstrate that clearing will have no impact because the species uses dense understorey at ground level.

  • Avoid clearing potential habitat wherever practicable, including unoccupied habitat that may become suitable after regeneration.
  • Retain links between patches of mallee and heath and avoid creating isolated remnants.
  • Map dense understorey, recent fire age, unburnt refuge patches and confirmed records before finalising the work footprint.

Threats: Fire and fire management

Frequent, extensive and high-severity wildfire is the most prominent threat identified for the Kangaroo Island subspecies. The 2019 to 2020 fires caused a substantial population reduction after burning about half of Kangaroo Island.

Prescribed burning, back-burning, mechanical vegetation removal, asset protection zones and buffer zones can also reduce habitat if they remove unburnt refuge or make the remaining understorey too open or fragmented.

Kangaroo Island fire impact: Approximately 67% of the modelled range intersected the 2019 to 2020 fire extent.

High to very high severity fire: Affected about 51% of the Kangaroo Island subspecies distribution.

  • Protect unburnt patches within or beside burnt areas from planned fire until surrounding habitat has recovered sufficiently.
  • Plan fire prevention and suppression activities with species location data and fire-age mapping.
  • Avoid treating all mallee and heath as requiring the same fire interval.

Threats: Predators and pest animals

Feral and domestic cats are a significant threat because the species forages and nests on or near the ground. Cat hunting pressure can increase after fire when open ground replaces dense cover.

Feral pigs can degrade habitat through grazing, trampling and digging, spread weeds and potentially assist the spread of Phytophthora cinnamomi. Livestock and other introduced herbivores can also damage the ground layer and understorey.

Estimated cats on Kangaroo Island: Around 1,600 individuals were estimated on the island in the cited assessment.

  • Prevent domestic animals from entering retained habitat around worksites.
  • Control food waste and other attractants that may draw cats or pigs towards refuge patches.
  • Include cat and pig control in recovery actions at important refuge sites after fire.

Threats: Disease, weeds and indirect impacts

Phytophthora cinnamomi can cause dieback in native plants and reduce the structure and quality of heath and mallee habitat. Weed invasion can alter vegetation structure, resources, fire behaviour and microclimate.

Tasmanian Blue Gum seedlings and other invasive plants can change native vegetation after fire. Soil, plant material, vehicles and pigs may assist the spread of pathogens or weeds.

  • Apply clean-down and hygiene procedures when moving machinery, soil or plant material between sites.
  • Do not transport soil or vegetation from known or suspected Phytophthora-affected areas into retained habitat.
  • Control emerging weeds without broad disturbance to dense native understorey.

Threats: Roads and construction disturbance

The supplied documents do not quantify road mortality or provide a species-specific road crossing rate. Roads and construction corridors can nevertheless remove habitat, divide dense cover, increase vehicle access and expose birds to predators.

Ground nests and dependent fledglings are especially vulnerable to grading, slashing, vehicle movements and repeated disturbance during July to December and for six to eight weeks after fledging.

  • Keep vehicle speeds low through retained mallee and heath and use designated access routes.
  • Avoid parking, turning or storing materials in dense understorey.
  • Schedule clearing outside the breeding season where practicable and inspect habitat immediately before each clearing stage.

Survey methodology: 1. Habitat assessment and targeted searches

Survey the Shy Heathwren in dense heath or shrubby mallee, with particular attention to ground cover and recently burnt habitat. The bird is small, secretive and often detected by sight or call, so surveys should be led by experienced observers and timed for calm conditions.

Map all potential habitat before field surveys, including mallee woodland, heathland, coastal or subcoastal mallee, dense shrub understorey and unburnt patches within or beside burnt areas.

Search on foot through suitable vegetation, moving slowly and checking dense shrubs, grass tussocks and the ground layer.

Look for a small brown bird with heavy breast streaking, a prominent white eyebrow, rufous upper tail coverts and a long, cocked tail.

Record signs of recent fire, vegetation structure, dense cover, tracks, predators, weeds and habitat fragmentation.

Adult size: About 14 cm long and about 15 g, with the NSW guide giving a length of 11.5 to 14 cm.

Typical habitat: Dense shrubby or heath understorey in mallee woodland, shrubland or heathland.

  • Conduct searches during the breeding season from July to December where practicable, when males are more likely to call.
  • Survey in the early morning, particularly on days with little or no wind.
  • Avoid relying on a single visit because the species is shy, secretive and can be difficult to detect.

Survey methodology: 2. Transects and call detection

Use walked transects through potential habitat and stop regularly to listen for calls or contact calls.

Use experienced observers because the species is secretive and usually remains close to dense shrubs.

Record the transect route, survey time, weather, wind, fire age, vegetation type, observer effort and every detection location.

Treat a call-only record as a detection only when the observer is confident that the call is attributable to Shy Heathwren.

Published species-specific effort: The supplied survey guideline does not provide a Shy Heathwren survey effort table.

Relevant comparison in the guideline: For the similar Chestnut-rumped Heathwren, the guideline gives 9 hours over 3 days for targeted searches and 9 hours over 3 days for transects with call playback, in areas up to 50 ha.

  • Use call playback only where it is permitted by the relevant state authority and where it will not disturb breeding birds.
  • If playback is used, record the sequence, volume, duration, intervals and response, and stop if the bird shows distress or approaches repeatedly.
  • Do not enter dense cover or approach a nest merely to confirm a record.

Survey methodology: 3. Post-fire and refuge surveys

Survey unburnt habitat within or beside fire-affected areas because these patches may provide refuge and sources for recolonisation.

Also survey burnt areas as vegetation regenerates, because Shy Heathwrens can use recently burnt habitat but severe fire can make large areas unsuitable.

Repeat surveys at consistent locations so changes in occupancy, detection rate and habitat recovery can be compared.

Kangaroo Island fire impact: An estimated 67 percent of the Kangaroo Island subspecies' range was within the 2019 to 2020 bushfire extent, with 51 percent burnt at high to very high severity and a further 11 percent at low to moderate severity.

Survey detection after fire: From May 2020 to April 2021, the Kangaroo Island subspecies was recorded on 24 percent of transect surveys in unburnt patches and 20 percent of surveys in burnt areas.

  • Give priority to habitat affected by recent high-severity fire, unburnt vegetation islands and dense regrowth patches.
  • Record fire severity, approximate time since fire and the condition of the understorey at each survey point.
  • Do not assume that absence from burnt vegetation means that the site is permanently unsuitable.

Survey methodology: Minimum effort and reporting

  • Use a qualified ecologist to set the final survey design after checking the size, condition, fire history and connectivity of the proposed disturbance area.
  • At minimum, complete a habitat assessment and repeated walked searches during suitable weather, with effort and non-detections documented.
  • Submit confirmed records, including photographs, sound recordings and accurate coordinates, to the relevant state wildlife database, such as the NSW BioNet Atlas where the work is in New South Wales.
  • Report the taxon used in the record, including Hylacola cauta and any relevant subspecies identification, because older sources may use Calamanthus cautus or Hylacola cautus.
  • Retain survey data, maps, weather observations, observer names and survey tracks with the project environmental records.

Before habitat disturbance: Avoid and minimise habitat loss

Avoid clearing Shy Heathwren habitat wherever practicable. The main project risk is removal or fragmentation of dense understorey, particularly where fire, clearing and predator activity act together.

Redesign the footprint to retain dense shrubby or heath understorey, mallee vegetation, unburnt refuge patches and links between retained patches.

Treat all potential suitable habitat as important until surveys and impact assessment show otherwise, especially on Kangaroo Island after the 2019 to 2020 fires.

Retain ground cover, leaf litter, fallen timber and dense shrubs because the species forages on the ground and nests close to the ground.

National listing: The Kangaroo Island Shy Heathwren subspecies is listed as Vulnerable under the EPBC Act.

State listing supplied for the profile: Vulnerable in New South Wales.

  • Avoid clearing unburnt habitat within or beside recently burnt areas where it may provide refuge or recolonisation sources.
  • Avoid unnecessary roadside vegetation removal, widening of access tracks and creation of isolated vegetation remnants.
  • Keep machinery, vehicle parking, spoil, laydown areas and stockpiles out of retained heath and dense mallee understorey.
  • Use the smallest practicable disturbance corridor and clearly mark the approved clearing boundary before work starts.

Before habitat disturbance: Approvals and project planning

Confirm the taxon, project location and applicable state or territory listing before finalising the impact assessment.

Check whether the action requires referral or approval under the EPBC Act and obtain all relevant state or territory permits before disturbance.

Prepare a fauna management plan that identifies habitat, survey results, clearing limits, fauna spotter catcher responsibilities, stop-work triggers, incident reporting and post-clearance checks.

  • Obtain written approval for any fauna handling, capture, relocation, nest management or use of call playback where required.
  • Schedule clearing outside the July to December breeding season where practicable.
  • Stage clearing so that retained habitat remains connected and animals can move towards nearby retained cover.
  • Consult the relevant state wildlife agency if a nest, dependent young, injured bird or concentration of birds is found.

Before habitat disturbance: Pre-clearance preparation

Complete a pre-clearance inspection by a suitably experienced ecologist or fauna spotter catcher immediately before works.

Mark dense understorey, nest sites, refuge patches, retained vegetation, fallen logs and any other features to be protected.

Check for dome-shaped nests near the ground, particularly in shrubs, grass tussocks and dense ground cover.

Install exclusion fencing where it can protect retained habitat without blocking movement between habitat patches.

Nest: Dome-shaped, usually near the ground, made from grass, leaves, bark, roots and twigs.

Breeding period: July to December.

  • Brief all operators on the species' appearance, habitat, handling limits and stop-work procedure.
  • Check that fencing, signage, radios, first aid materials, transport containers and wildlife contacts are ready before clearing begins.
  • Inspect machinery for weed seed and soil contamination and apply hygiene controls to reduce the spread of weeds and Phytophthora cinnamomi.
  • Do not conduct pre-clearance searches in conditions that prevent reliable detection, such as strong wind, heavy rain or poor visibility.

During habitat disturbance: Daily clearing controls

Use a controlled clearing sequence with a fauna spotter catcher present. Keep disturbance within the approved footprint and protect dense retained cover from machinery, fire and introduced predators.

Complete a daily pre-start inspection of the work area, exclusion fencing, retained habitat and access routes.

Keep a suitably authorised fauna spotter catcher in the active clearing zone whenever vegetation or ground habitat is being disturbed.

Clear progressively towards retained vegetation so that any mobile bird has an opportunity to move into cover.

Use low-speed machinery near retained vegetation and stop machinery immediately when directed by the fauna spotter catcher.

  • Keep workers, vehicles and machinery out of marked refuge patches and retained dense understorey.
  • Do not burn, mulch or mechanically remove unburnt refuge habitat beside burnt areas unless it is specifically approved.
  • Prevent domestic dogs and other unauthorised animals from entering the work area.
  • Suspend clearing during strong wind, heavy rain, smoke, poor visibility or any condition that prevents effective fauna detection.

During habitat disturbance: Fauna spotter catcher response

The fauna spotter catcher should direct machinery operators using agreed radio or hand signals and maintain a clear view of the active clearing front.

If a Shy Heathwren is seen, allow it to move into nearby retained habitat where possible rather than attempting capture.

Only an appropriately authorised person should capture, handle or transport the bird.

If relocation is approved and required, release the bird into nearby retained habitat with dense cover and suitable ground structure, avoiding exposure to open ground.

  • Do not chase, flush repeatedly, net or handle the bird solely to obtain a closer identification.
  • Do not disturb a suspected nest or attempt to move eggs or young without specific approval and advice from the relevant wildlife authority.
  • Place an injured bird in a dark, ventilated container with minimal handling and transfer it promptly to an authorised wildlife carer or veterinarian.
  • Record the bird's location, behaviour, direction of movement, handling time, release location and condition.

During habitat disturbance: Habitat features and stop-work triggers

Protect dense shrubs, grass tussocks, leaf litter, fallen logs and woody debris that provide cover, foraging substrate or nest sites.

If a hollow-bearing tree, log, rock, burrow or other fauna feature must be disturbed, stop and obtain project ecologist direction before proceeding.

Although Shy Heathwrens nest near the ground rather than in tree hollows, other fauna may use hollows and retained habitat must be managed for the broader fauna assemblage.

  • Stop work if a Shy Heathwren, active nest, dependent young, injured fauna or unexpected concentration of birds is found within or beside the clearing front.
  • Stop work if exclusion fencing is damaged, the clearing boundary is unclear or machinery enters retained habitat.
  • Stop work if fire, smoke, weed spread, feral animal activity or erosion is causing an unplanned risk to retained habitat.
  • Restart only after the fauna spotter catcher and project ecologist have inspected the area and documented the control decision.

During habitat disturbance: Records and incident reporting

  • Maintain a daily register of personnel, weather, clearing area, machinery, fauna observations, captures, relocations, injuries, mortalities and stop-work events.
  • Photograph and map any nest, refuge patch, injured bird, mortality or unauthorised clearing incident.
  • Notify the project manager and relevant authority of any listed fauna injury, mortality, nest disturbance or clearing outside the approved footprint.
  • Submit verified sightings and incident records to the relevant state wildlife database and retain copies with the project approval records.

After habitat disturbance: Post-clearance inspection

Post-clearance work should confirm that the approved footprint was respected and that retained habitat remains usable. Continue controls where fire, weeds, disease or predators could prevent recovery.

Inspect the cleared area and its edges after machinery has left, checking for injured or trapped fauna, damaged exclusion fencing, exposed nests and unplanned habitat loss.

Check retained dense understorey, unburnt refuge patches, logs and ground cover for machinery damage, soil compaction, weed introduction and erosion.

Remove temporary materials, spoil and waste from retained habitat.

  • Complete a final fauna search before demobilisation from each staged work area.
  • Repair damaged fencing and restore the approved no-go areas.
  • Record the final cleared area using photographs, maps and spatial data.
  • Report all fauna incidents, including animals found after the spotter catcher has left the active work front.

After habitat disturbance: Monitoring and ongoing controls

Monitor retained and rehabilitated habitat for Shy Heathwren use, vegetation recovery and the return of dense understorey.

Repeat targeted searches during suitable weather and during July to December where monitoring is required by the approval or fauna management plan.

Use consistent transects and observers where possible so detection rates can be compared between monitoring periods.

  • Monitor feral cats, feral pigs, weeds and Phytophthora cinnamomi in and around retained habitat.
  • Protect unburnt refuge areas from back-burning, clearing and other disturbance until adjacent burnt habitat has recovered sufficiently.
  • Review fire management activities if prescribed burning or mechanical fuel reduction would remove dense refuge habitat.
  • Use adaptive management when monitoring shows declining occupancy, poor regeneration or increased predator activity.

After habitat disturbance: Compliance, offsets and reporting

Complete the approval-required completion report with cleared area, retained habitat, fauna incidents, mitigation actions and monitoring results.

If impacts cannot be avoided or mitigated, obtain advice on any required offset or other compensatory action under the applicable approval and legislation.

Do not treat an offset as a substitute for retaining habitat critical to survival where avoidance is practicable.

  • Provide spatial data for all retained and rehabilitated habitat to the approval holder and relevant authority.
  • Submit significant fauna records to the relevant state wildlife database.
  • Keep evidence of fauna spotter catcher qualifications, permits, daily registers and incident notifications.

Rehabilitation actions: Restore suitable vegetation structure

Rehabilitation should recreate dense, low vegetation with connected cover and a functioning ground layer. It should be planned around local vegetation, fire history and the need to control predators, weeds and disease.

Use locally appropriate native mallee, heath and shrub species that recreate a dense understorey at ground level.

Base the planting palette on the pre-clearing community, local seed sources and the site's soil, rainfall and fire history.

Restore a continuous or stepping-stone connection between retained habitat patches wherever the project footprint has fragmented cover.

Allow natural regeneration where it is occurring and protect regenerating shrubs from grazing, trampling and vehicle access.

Foraging: Mostly ground foraging for insects, with occasional seed feeding.

Nest structure: A dome-shaped nest near the ground, usually concealed in grass tussocks or shrubs.

  • Do not plant invasive or non-local species that could alter habitat structure or fire behaviour.
  • Control weeds before planting and during establishment, including fire-adapted weeds that can change the understorey and increase fire risk.
  • Prevent the spread of Phytophthora cinnamomi through machinery, soil, footwear and revegetation materials.
  • Retain and reinstate suitable fallen logs, leaf litter, woody debris and dense ground cover where these have been removed.

Rehabilitation actions: Manage fire and predators

Develop fire management with regard to the species' need for dense cover, unburnt refuge patches and recovery time after fire.

Avoid frequent, extensive or high-severity fire across all retained or rehabilitated habitat at the same time.

Protect unburnt patches within or beside fire-affected areas from planned burns and mechanical clearing while burnt habitat recovers.

Control feral cats near important refuge sites where authorised and supported by the relevant control programme.

Key fire risk: Frequent, large-extent, high-severity wildfire is identified as the most prominent threat.

Other identified threats: Feral cat predation, feral pig damage, vegetation clearing, inappropriate fire management, invasive weeds and Phytophthora cinnamomi dieback.

  • Coordinate fire planning with the relevant land manager and threatened species authority.
  • Monitor feral pigs because grazing, trampling, digging, disease transmission and spread of Phytophthora cinnamomi can degrade habitat.
  • Remove invasive weeds that alter the floristic structure, ground cover, fire regime or microclimate.
  • Do not use nest boxes as a substitute for dense shrub and ground habitat, because the Shy Heathwren nests near the ground rather than in tree hollows.

Rehabilitation actions: Success measures and monitoring

Recovery outcome in the national advice: Restore the Kangaroo Island Shy Heathwren population to its estimated size before the 2019 to 2020 bushfires.

Known data gap: The impact of wildfire on the subspecies, including its ability to recolonise burnt habitat, requires further research and monitoring.

  • Measure survival and cover of planted and naturally regenerating shrubs, ground cover, leaf litter and retained woody debris.
  • Confirm that rehabilitation is free of significant weed outbreaks and that hygiene measures have prevented new Phytophthora cinnamomi impacts.
  • Monitor the use of rehabilitated and retained habitat with repeat walked transects during suitable weather, with additional effort during July to December.
  • Record Shy Heathwren detections, call records, breeding observations, predator activity, fire events and habitat condition at each monitoring visit.
  • Set project-specific completion criteria for vegetation cover, connectivity, weed control and fauna use in the rehabilitation plan.
  • Continue monitoring until the approval holder and relevant authority agree that the habitat is stable and functioning as intended.

Sources