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Arnhem Land Gorges Skink (Bellatorias obiri)

The Arnhem Land Gorges Skink is a large, cryptic skink of rocky gorges, sandstone outcrops and deep crevices in western Arnhem Land, Northern Territory. Its habitat can be easily overlooked during site works, and the species is listed as Endangered under both Commonwealth and Northern Territory legislation, so potential rocky habitat should be surveyed and avoided wherever practicable.

Conservation status

Commonwealth, EPBC Act 1999: Endangered.

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

Breeding season

The Arnhem Land Gorges Skink is poorly known, and breeding timing has not been recorded. Adults are probably active for most of the year in suitable sandstone gorges and rocky crevices, including in the Northern Territory.

Breeding mode: Not recorded.

Breeding timing: Not recorded.

Clutch or litter size: Not recorded.

Incubation or gestation: Not recorded.

Age at maturity: Not recorded.

Breeding sites: Not recorded. Deep rock crevices in sandstone outcrops are used for shelter, but breeding use has not been confirmed.

Activity and detectability may vary between years and regions, particularly with rainfall, fire conditions and water availability, so site-specific pre-clearance assessment remains necessary.

  • Breeding activity: No breeding months have been established, so surveys should not assume a low-risk breeding period.
  • Adult activity in rocky gorges and crevices: The species is probably active for most of the year, with observations near deep crevices in the late afternoon.
  • Late afternoon surface activity: Late afternoon is a useful period for quiet visual searches near likely crevices, although detection rates are low.
  • Camera and eDNA survey activity window: Camera activity was assessed from August to February, and eDNA sampling was undertaken in October, but this does not establish a seasonal peak.
  • Rock crevice and sandstone outcrop disturbance: Deep crevices, fissures and cave systems may provide year-round shelter and should be protected during clearing and construction.
  • Highest clearing risk: Treat all months as potentially harmful because breeding timing is unknown and occupied crevices may provide shelter at any time of year.

Identification: Appearance and size

The Arnhem Land Gorges Skink is a large, robust and extremely cryptic skink. It is rarely seen, even in suitable habitat, so a lack of sightings does not confirm that a rocky site is unoccupied.

Adults have a robust body and may reach approximately 200 mm snout to vent length. The species has relatively large scale counts compared with its closest recognised congener, the Major Skink.

Midbody scale rows: 44 to 48

Paravertebral scales: 59 to 65

Identification: Similar species

The Major Skink, Bellatorias frerei, is the nearest congener identified in field guidance, but it occurs in eastern Australia and southern New Guinea. The Arnhem Land Gorges Skink lacks the strong colour separation between the dorsal and lateral surfaces seen in some Major Skinks.

Identification: Calls and field signs

No reliable field call or echolocation feature is associated with this species. Droppings, nests, whitewash, stains and odour are not dependable site indicators for field crews.

  • Treat any large skink seen near sandstone fissures or deep crevices as potentially significant until identified.
  • Photograph the animal and its habitat, record the location, and seek confirmation from a suitably experienced reptile ecologist.
  • Do not handle or move an individual unless this is authorised under the project fauna handling procedure.

Identification: Detection approach

The species is difficult to detect and has fewer than 40 confirmed records since it was first recognised by scientists in 1974. Use several methods where potential habitat is present.

  • Inspect rock crevices and gorge edges during the late afternoon, when active individuals have been observed.
  • Use distant observation with binoculars around likely hiding places before entering or disturbing crevices.
  • Where authorised, use cage or Elliot trapping with experienced fauna handlers. Capture rates are low, so trapping should not be treated as a quick clearance check.
  • Camera traps can help confirm use of individual crevices and should be considered for high-value habitat.

Distribution: Range in Australia

The Arnhem Land Gorges Skink is a restricted-range Australian endemic. Confirmed records are centred on western Arnhem Land in the Northern Territory, with the NT Atlas recording 12 locations in Arnhem Land.

The known range is on the western Arnhem Land Plateau, near the East Alligator and South Alligator River drainages. The species is also associated with Kakadu National Park and nearby parts of the West Arnhem region.

  • State and territory: Northern Territory only.
  • Region: western Arnhem Land, including the Arnhem Land Plateau and areas near Kakadu.
  • Known settings: rugged, remote rocky gorges, sandstone outcrops and boulder fields.

Distribution: Site screening

During project planning, screen the full disturbance footprint and access routes for sandstone outcrops, gorge systems, fissures and cave-like rock features. Suitable habitat may also occur in the Katherine region, so habitat screening should not rely only on the mapped known range.

  • Give particular attention to intact sandstone formations with extensive fissures.
  • Check temporary work areas, laydown areas, access tracks and construction corridors as well as permanent infrastructure sites.
  • Escalate potential habitat to the project ecologist before clearing or blasting.

Distribution: Survey confidence

The species has been poorly surveyed and studied. Remote terrain and its cryptic behaviour make false negative survey results likely.

  • Do not use a single unsuccessful search to clear potential habitat.
  • Combine habitat assessment, targeted searches, camera trapping and authorised trapping where the risk warrants it.
  • Record both occupied and apparently unoccupied crevices, including photographs and mapped locations.

Habitat: Landforms and rock features

Look for the Arnhem Land Gorges Skink in sandstone landscapes with complex rock structure. The most useful habitat clues are deep fissures, extensive crevice networks and cave systems, rather than vegetation alone.

Known habitat includes sandstone escarpments, rocky gorges, outcrops and boulder fields. Outcrops with extensive fissures and cave systems are especially relevant and may represent inferred critical habitat.

  • Sandstone escarpments and plateau margins.
  • Wet, thickly vegetated rocky gorges.
  • Large boulder fields with deep gaps.
  • Outcrops containing connected fissures or cave systems.

Habitat: Vegetation and site condition

Recorded sites include closed forest and wet, thickly vegetated gorge habitat. Vegetation should be considered alongside rock structure, moisture and shelter availability.

  • Retain native vegetation around rock formations where practicable.
  • Avoid unnecessary removal of canopy, understorey and ground cover around crevices.
  • Check for fire impacts, weed invasion and erosion that may reduce habitat quality.

Habitat: Construction planning

Potential habitat should be avoided or spanned wherever practicable. Where a route cannot avoid a sandstone outcrop or gorge, use micro-siting to keep structures and access works away from fissures and cave systems.

  • Mark potential habitat as a field constraint before clearing.
  • Use no-go areas around significant outcrops where directed by the project ecologist or regulator.
  • Keep spoil, machinery, stored materials and drainage works out of crevices and gorge margins.
  • If the species is found, avoid or span the habitat between overhead line structures where feasible.

Foraging habitat: Likely foraging setting

The diet and detailed foraging behaviour of the Arnhem Land Gorges Skink are poorly known. In the field, protect the connected rocky gorge environment rather than focusing only on the crevice where an animal is observed.

Individuals have been observed near deep crevices in rocky gorge habitat. Foraging areas may include the immediate rock surface, vegetated margins and damp ground around outcrops, but the species specific diet has not been established.

  • Retain vegetation and leaf litter around rocky outcrops.
  • Avoid disturbing wet gorge margins, springs and small pools near occupied or potential crevices.
  • Do not assume that open ground beside a crevice has no habitat value.

Foraging habitat: Field management

Keep the area around a detection quiet and free from unnecessary vehicle, pedestrian and machinery movement. Have the fauna spotter catcher establish a practical exclusion area based on the rock formation and proposed works.

  • Stop work if an animal is found in the active work area.
  • Prevent sediment, concrete washout, fuel and other pollutants from entering gorges, pools or crevice systems.
  • Use covered loads and clean machinery to reduce weed spread into rocky habitat.

Foraging habitat: Survey considerations

Because the species is cryptic, survey effort should include habitat inspection and repeated observation rather than relying only on visible animals. Camera trapping may help identify activity at individual crevices.

  • Search during the late afternoon when conditions and activity may improve detection.
  • Use binoculars to observe likely crevice entrances before approaching.
  • Record signs of recent activity and camera detections by individual crevice where possible.

Breeding habitat: Features to protect

Breeding sites and reproductive timing are not well established for this species. Deep fissures and cave systems should be treated as sensitive habitat because they may provide secure breeding or juvenile shelter.

No specific nest or breeding structure has been confirmed in the available field guidance. Protect sandstone outcrops, deep fissures and connected cave systems as potential breeding habitat.

  • Do not fill, seal, drill or blast crevices without ecological assessment.
  • Avoid cutting through outcrops or removing boulders that form shelter networks.
  • Keep vibration, dust, runoff and night lighting away from significant rock formations where practicable.

Breeding habitat: Breeding timing

A defined breeding season, litter size and age at maturity have not been established. Apply a precautionary approach throughout the year rather than relying on a seasonal clearance window.

  • Plan works to avoid potential habitat at all times of year.
  • Seek project-specific advice before disturbing a site where animals, juveniles or repeated camera detections are recorded.
  • Keep records of all observations to improve future habitat and breeding assessments.

Breeding habitat: If an animal is found

Pause nearby works and allow the fauna spotter catcher to assess the animal, its crevice and the surrounding rock structure. Do not seal the shelter or relocate the animal without an approved procedure.

  • Maintain a practical exclusion area around the occupied feature.
  • Inspect the proposed work method for vibration, access and debris risks.
  • Obtain advice from the project ecologist and relevant wildlife authority where required.

Sheltering habitat: Shelter features

Deep rock crevices are the clearest shelter feature for the Arnhem Land Gorges Skink. Individuals have also been recorded using individual crevices within rugged gorges and boulder fields.

Focus searches on deep, shaded fissures and crevice entrances in sandstone outcrops. Connected cracks, cave systems and gaps between large boulders may provide additional shelter.

  • Deep rock crevices.
  • Sandstone fissures and cave systems.
  • Boulder fields with concealed gaps.
  • Rocky gorge walls and ledges near wet vegetation.

Sheltering habitat: Signs of use

Camera trapping has recorded activity at individual rock crevices. Repeated detections at a crevice should be treated as evidence of a regularly used shelter, even if the animal is not present during a site inspection.

  • Install cameras without blocking entrances or altering the rock surface.
  • Minimise visits to occupied crevices.
  • Map each active feature and link it to the construction footprint and access plan.

Sheltering habitat: Protection during works

Avoid direct disturbance to occupied and potential shelter features. Use micro-siting, spanning and clearly marked exclusion areas before vegetation clearing or earthworks begin.

  • Keep machinery, spoil and materials away from crevice entrances.
  • Prevent sediment and runoff from entering fissures and cave systems.
  • Avoid rock removal, blasting, vibration and uncontrolled fire near suitable outcrops.
  • Include potential habitat in the pre-clearance briefing for operators and fauna spotter catchers.

Threats: Clearing and construction

The main site risks are loss or degradation of rocky habitat, inappropriate fire, introduced predators and invasive species. The species is Endangered, so project planning should aim to avoid impacts rather than rely on post-clearing rescue.

Clearing, track formation, trenching, pole or tower placement, blasting and rock removal can destroy or isolate crevices and cave systems. Even small disturbances may matter because the known range and population are restricted.

  • Avoid sandstone outcrops, gorge walls, fissures and cave systems wherever practicable.
  • Use micro-siting to reduce the need for clearing and rock disturbance.
  • Assign potential habitat a project constraint and obtain ecological sign-off before disturbance.
  • Stop work and reassess if a skink or occupied crevice is found.

Threats: Fire and habitat condition

Changes to fire regimes may alter food resources and habitat quality across the species range. Protect rocky gorge vegetation and apply the project fire management plan carefully around known or potential habitat.

  • Prevent escaped fires and avoid unnecessary high-intensity burning near rocky outcrops.
  • Maintain appropriate burning regimes in consultation with land and biodiversity managers.
  • Control grassy weeds that can increase fuel loads and change fire behaviour.

Threats: Predators and invasive species

Feral Cats and Cane Toads are identified conservation concerns. Buffalo, feral pigs, invasive grasses and other weeds can also degrade habitat in the broader Kakadu and West Arnhem landscape.

  • Do not create rubbish, food waste or artificial shelter that may attract predators.
  • Use hygiene and weed management procedures on vehicles, machinery and materials.
  • Report feral animal activity and cane toad incursions through the project environmental system.
  • Coordinate control actions with land managers rather than undertaking ad hoc baiting or trapping.

Threats: Survey and compliance response

The species is difficult to detect and has been recorded only rarely. For an Endangered species, a negative survey result should not be used by itself to justify clearing of suitable rocky habitat.

  • Undertake targeted habitat assessment before finalising the work footprint.
  • Use experienced reptile ecologists and fauna spotter catchers for potential habitat.
  • Keep all records of searches, camera detections, trapping and habitat constraints.
  • Refer confirmed records and proposed impacts to the relevant environmental approval and wildlife authority processes.

Survey methodology: 1. Desktop assessment

The Arnhem Land Gorges Skink is a very cryptic, restricted range skink associated with sandstone outcrops, rocky gorges, deep fissures and cave systems. Survey results can be affected by low detectability, so use more than one method and treat suitable habitat as significant even when no animal is seen.

Map sandstone escarpments, outcrops, rocky gorges, boulder fields, deep fissures and cave systems before field work starts.

Check the NT Atlas, current species distribution information and project records for nearby observations. Confirm whether the work area is within or near the western Arnhem Land plateau and the East Alligator or South Alligator River drainages.

Have a suitably qualified ecologist assess any potential habitat. Do not rely on the absence of previous records to dismiss isolated suitable outcrops.

Known range: Western Arnhem Land, Northern Territory

Habitat indicators: Sandstone outcrops with extensive fissures and cave systems, rocky gorges, boulder fields and deep rock crevices

  • Overlay the construction footprint, access tracks, laydown areas and clearing limits on habitat mapping.
  • Identify areas that can be avoided or spanned by structures.
  • Record the location and condition of each potential habitat feature.

Survey methodology: 2. Active searches and trapping

Search suitable outcrops and crevice margins during the late afternoon, when active individuals have been observed near deep crevices. Distant observation with binoculars can reduce disturbance.

Use mammal cage traps or Elliot traps only under an approved trapping plan and by people authorised to trap reptiles. Baited traps may improve detection, with peanut butter, rolled oats and honey identified as possible bait for this group.

Capture rates can be low. Set effort according to the extent and quality of habitat, access and the risk posed by the work. Document the effort rather than relying on a single visit.

Likely activity: Probably active for most of the year, with observations in the late afternoon

Detection history: The species is extremely cryptic and has very few confirmed records

  • Inspect likely crevice entrances and adjacent vegetation without blocking escape routes.
  • Use cameras at representative crevices where direct searches are impractical or where activity is suspected.
  • Check traps at the required frequency under the relevant animal ethics, welfare and permit conditions.
  • Do not place traps or cameras in a way that damages fissures, cave systems or shelter sites.

Survey methodology: 3. Supplementary detection methods

Camera trapping can help confirm use of individual crevices and identify activity before construction. Position cameras to view entrances and nearby movement routes.

Environmental DNA may be useful as a supplementary method at occupied crevices or adjacent pools, but it should not replace habitat assessment, camera trapping or targeted searches.

Use specialist advice when selecting eDNA sampling locations, interpreting results or deciding whether a negative result is reliable.

  • Keep a chain of custody for eDNA samples.
  • Record positive, negative and inconclusive results separately.
  • Treat a positive result as evidence requiring protection and further assessment.
  • Do not treat a negative eDNA or camera result as proof that suitable habitat is unoccupied.

Survey methodology: 4. Survey records

Record enough information for another ecologist to understand what was searched, when it was searched and how likely detection was under the conditions.

Photograph habitat features from outside crevices where possible. Avoid handling rocks or entering caves unless authorised and necessary.

  • Record date, start and finish times, weather, recent rain, temperature where measured, and fire history if known.
  • Map all outcrops, fissures, cave systems, crevices, captures, sightings, camera detections and signs.
  • Record trap type, number of traps, bait, trap locations, trap checks and camera deployment period.
  • Record observer names, qualifications, permits, animal condition and any identification photographs.
  • Submit records to the project database and relevant Northern Territory biodiversity authority.

Before habitat disturbance: 1. Approvals and permits

Avoidance is the preferred control for this Endangered species. Complete approvals, habitat mapping and field checks before vegetation or rock disturbance starts, and give the site team clear stop work instructions.

Have the project environmental approval pathway reviewed before final design. Refer the action under the EPBC Act if the project may have a significant impact on this Endangered species or its habitat.

Obtain Northern Territory permits and approvals for fauna survey, trapping, handling, relocation and disturbance where required. Confirm requirements with the relevant NT authority before work begins.

A Queensland species management program is relevant where Queensland law requires one for interference with a protected breeding place. This species is mapped in the Northern Territory, so do not assume a Queensland approval replaces an EPBC or Northern Territory requirement.

Check all other state or territory permits if equipment, animals or project activities cross jurisdictional boundaries.

Commonwealth status: Endangered under the EPBC Act

Northern Territory status: Endangered under the TPWC Act

  • Keep copies of approvals, permits, conditions and contact details on site.
  • Nominate the person responsible for compliance decisions.
  • Include permit conditions in the construction environmental management plan.

Before habitat disturbance: 2. Avoidance and habitat protection

Micro-site towers, tracks, work pads and laydown areas away from sandstone outcrops, rocky gorges, fissures and cave systems.

Where potential habitat cannot be avoided, design structures to span the habitat where practicable. Use a clearly marked exclusion area around each feature and keep plant, vehicles, spoil and materials outside it.

There are no species-specific buffer distances established for this skink. Set site-specific buffers through ecological assessment, based on the extent of the outcrop, fissure and cave system and the risk of vibration, rock movement, dust, fire and access.

  • Fence or flag habitat before mobilisation.
  • Do not blast, excavate, grade, drill, store materials or alter drainage within protected habitat unless specifically approved.
  • Keep fire management, weed control and erosion controls from damaging crevices or cave entrances.
  • Prevent workers from entering fissures or moving loose rocks.

Before habitat disturbance: 3. Pre-clearance survey and timing

Complete a pre-clearance inspection after final site marking and before disturbance. Search all sandstone outcrops, gorges, boulder fields and crevice systems that could be affected.

The breeding season and breeding places of this skink are not well defined. Do not schedule works on the assumption that a particular season is safe. Retain suitable crevices throughout the year and obtain ecological advice if a breeding place is suspected.

Use late afternoon searches where safe and practical, supported by cameras or trapping where the habitat warrants additional effort.

  • Inspect the full disturbance footprint and a suitable surrounding area identified by the ecologist.
  • Have a qualified fauna spotter catcher present for any clearing near potential habitat.
  • Repeat the inspection if the footprint, access route or construction method changes.
  • Stop design finalisation if a new outcrop, cave system or occupied crevice is found.

Before habitat disturbance: 4. Induction and exclusion controls

Brief every worker, contractor and machine operator before entering the work area. Use photographs or site maps to show protected habitat and the stop work process.

Limit access to authorised personnel. Keep exclusion fencing intact and inspect it before each shift.

  • Explain the species identification, its cryptic behaviour and its association with deep rock crevices.
  • Provide the spotter catcher and environmental representative with authority to stop work.
  • Mark no go areas on plans, GPS units and site signage.
  • Prohibit collection, handling, chasing, feeding or photographing animals at close range by unauthorised people.
  • Keep emergency contact details and wildlife transport arrangements available.

During habitat disturbance: 1. Sequential clearing

Use a staged, low impact clearing sequence and keep a qualified fauna spotter catcher in control of fauna decisions. Work must stop when a skink, occupied crevice or other protected fauna feature is found in the impact area.

Clear only the approved footprint and work in stages from already disturbed ground towards retained habitat. Start with access and low risk vegetation work, then proceed to higher risk works after the area has been checked.

Do not use clearing methods that collapse, seal, flood or destabilise sandstone fissures, cave systems or crevices.

Keep machinery outside exclusion areas unless the approval specifically allows entry.

  • Confirm the daily work area and exclusion limits at the pre-start meeting.
  • Inspect the work area immediately before each new clearing stage.
  • Remove loose materials and spoil from habitat protection areas.
  • Maintain escape routes towards retained rocky habitat when clearing near potential shelter sites.

During habitat disturbance: 2. Animal handling and active habitat

Only an authorised and suitably experienced person may handle an Arnhem Land Gorges Skink. Avoid handling where the animal can move safely into retained habitat and the spotter catcher considers the risk low.

If an animal is found, stop work, secure the area and allow the fauna specialist to assess the situation. Do not chase it into a crevice or dismantle shelter habitat.

If an active breeding place is suspected, stop work and protect the feature. Obtain advice from the relevant authority and project ecologist before any disturbance or relocation decision.

  • Record the animal before moving it, including photographs, location and habitat.
  • Use approved capture equipment and minimise restraint time if handling is necessary.
  • Release a relocated animal only under an approved method and at a suitable nearby location selected by the ecologist.
  • Do not relocate animals across roads, into unsuitable habitat or outside the approved release area.
  • Do not disturb eggs, young, shelter sites or suspected breeding places.

During habitat disturbance: 3. Stop work and incident response

The spotter catcher or environmental representative must have authority to stop work immediately. Work remains stopped until the animal or habitat has been assessed and controls are documented.

Treat damage to a fissure, cave system or sandstone outcrop as an environmental incident, even if no animal is seen.

  • Stop machinery and establish a quiet exclusion area.
  • Prevent people from entering, handling or photographing the animal unnecessarily.
  • Notify the site supervisor, environmental manager and relevant approval contact.
  • Record the location, activity, habitat affected, people involved, photographs and immediate controls.
  • Resume work only after the spotter catcher and approval holder confirm that the conditions are met.

During habitat disturbance: 4. Injured animal pathway

If an animal is injured, keep it shaded, quiet and secure from predators. Do not give food or water unless directed by a wildlife veterinarian or authorised fauna specialist.

Arrange assessment and transport through an authorised wildlife carer, veterinarian or relevant Northern Territory contact.

  • Use a clean, secure container suitable for a large skink, with ventilation and a stable substrate.
  • Record the exact capture location and time so the animal can be returned if approved.
  • Avoid unnecessary transport, heat exposure and repeated handling.
  • Report the injury and outcome under the project approval and incident system.

After habitat disturbance: 1. Post-clearance checks

Post-clearance checks confirm that no animal or habitat feature was overlooked and that exclusion controls remain effective. Use the results to improve later work stages and report all records through the approval process.

Inspect the completed clearing area and the edges of retained habitat after each stage. Look for animals, damaged crevices, displaced rocks, sediment entry, dust, altered drainage and unauthorised access.

Have the ecologist determine whether further camera trapping or targeted searches are needed where suitable habitat remains adjacent to the works.

  • Check all retained outcrops and exclusion fencing.
  • Remove machinery, spoil and temporary materials from habitat protection areas.
  • Repair damaged fencing and erosion controls promptly.
  • Document the date, personnel, area checked and findings.

After habitat disturbance: 2. Monitoring and relocated animals

Monitor any approved release site and retained habitat according to the ecological assessment, permit conditions and approval requirements. Camera trapping may be suitable for checking continued use of crevices.

Do not assume that a relocated animal has survived because it was not found again. Record all follow-up effort and results.

  • Use consistent camera locations and deployment methods where repeat monitoring is required.
  • Check for habitat damage, weed invasion, fire impacts, feral cat activity and cane toad presence.
  • Record observations, camera detections, recaptures, injuries and mortalities.
  • Report any new detection outside the approved area to the project ecologist and relevant authority.

After habitat disturbance: 3. Reporting and incident review

Provide a close out report that links fauna records to maps, work stages and approval conditions. Include negative results with the search effort used.

Review every stop work event, habitat breach, injury, relocation and unexpected sighting before the next construction stage.

  • Compare actual disturbance with the approved footprint.
  • Record whether avoidance and spanning measures worked as planned.
  • Update the construction environmental management plan if controls were inadequate.
  • Share confirmed records with the relevant biodiversity database and authority, subject to sensitive location controls.
  • Retain photographs, field sheets, permits, chain of custody records and veterinary or wildlife care outcomes.

Rehabilitation actions: 1. Restore rocky habitat

Rehabilitation should restore rocky habitat processes and protect the crevices that provide shelter. For this species, retaining natural sandstone outcrops and fissure systems is more appropriate than installing generic nest boxes or artificial roost structures.

Protect retained outcrops, boulder fields, fissures and cave systems from further disturbance. Do not fill, cap, seal or rearrange natural crevices.

Where disturbance has affected the ground around an outcrop, stabilise soil and drainage without blocking crevice entrances or changing water flow into the habitat.

  • Remove temporary roads, pads, spoil and barriers where approved.
  • Use locally appropriate native vegetation to control erosion around, but not inside, rocky habitat.
  • Keep rehabilitation machinery outside protected fissures and cave systems.
  • Use erosion and sediment controls that cannot wash soil into crevices.

Rehabilitation actions: 2. Artificial structures and habitat features

Nest boxes, bat boxes, artificial nest sites and roost structures are not established replacement habitat for the Arnhem Land Gorges Skink. Do not install them as a substitute for natural sandstone crevices.

If natural shelter has been unavoidably damaged, seek species specialist and authority advice before considering any artificial rocky shelter. Any design should be based on local geology and tested under an approved monitoring program.

  • Prioritise retention and reinstatement of natural fissures and stable rock features.
  • Do not place boxes, pipes, rubble or artificial shelters without written ecological justification and approval where required.
  • Do not enter or modify caves to create replacement habitat.
  • Monitor any approved trial structure for use, safety and unintended effects.

Rehabilitation actions: 3. Fire, weeds and predators

Manage rehabilitation areas under an appropriate fire regime for the known range, with advice from land managers and the project ecologist. Prevent fire controls from damaging rocky habitat or concentrating heat in crevices.

Control Gamba Grass and other invasive grasses, and prevent weed spread through clean machinery and controlled soil movement.

Include feral cat and cane toad risk in site management where these species occur, while recognising that project controls must be consistent with approved land management programs.

  • Inspect vehicles and machinery before entering rehabilitation areas.
  • Use local weed hygiene procedures for soil, gravel and plant material.
  • Keep rehabilitation free of dumped materials and food waste that may attract predators.
  • Record weed treatment, fire management and pest control activities.

Rehabilitation actions: 4. Water, lighting and long term monitoring

Maintain natural drainage and avoid directing sediment, contaminated water or excessive flow into rocky gorges and crevice systems. Avoid unnecessary night lighting near retained habitat.

Set monitoring duration and frequency through the ecological assessment and approval conditions, with additional checks after major fire, flood, construction changes or pest control.

  • Use low spill, downward directed lighting only where lighting is necessary for safety.
  • Turn off temporary lighting when work areas are not in use.
  • Monitor habitat condition, crevice integrity, weed cover, fire effects and animal detections.
  • Review rehabilitation results with the land manager and adjust controls when monitoring shows decline.
  • Keep rehabilitation records with the project environmental register and close out unresolved actions.

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