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Alpine Water Skink (Eulamprus kosciuskoi)

The Alpine Water Skink is a medium-sized, live-bearing skink of isolated high-elevation wetlands, bogs, seepages and wet heath in New South Wales, the Australian Capital Territory and Victoria. It is listed as Vulnerable nationally and in the ACT, NSW and Victoria, so clearing, earthworks, altered drainage, fire and construction activity near suitable alpine wetland habitat require targeted assessment and controls.

Conservation status

Commonwealth, EPBC Act 1999: Vulnerable.

New South Wales, Biodiversity Conservation Act 2016: Vulnerable.

Victoria, Flora and Fauna Guarantee Act 1988: Vulnerable.

Australian Capital Territory, Nature Conservation Act 2014: Vulnerable.

Breeding season

Alpine Water Skinks mate in spring, carry developing young for 10 to 12 weeks, and give birth in late summer to early autumn. Clearing risk is highest during the winter sheltering period and from spring through early autumn, when mating, gravid females and newborns may be present.

Reproductive mode: Live-bearing, also described as ovoviviparous.

Litter size: Usually 1 to 6 young; up to 8 is reported for the group.

Gestation: 10 to 12 weeks.

Size at birth: Not recorded.

Age at maturity: Females mature at 2 to 3 years.

Nest or egg sites: Not applicable for this live-bearing species. Birth shelter is not recorded.

Breeding frequency: Not recorded.

Confirm timing locally before works, as elevation, snow cover, rainfall and temperature can alter emergence, surface activity, mating and birth dates.

  • Mating: Mating occurs in spring, generally September to November. Timing may shift with elevation, snow cover and local temperature.
  • Gravid females: Females carry developing young for 10 to 12 weeks after spring mating. Gravid females may therefore be present from September through January, with some pregnancies extending into February or March when mating or birth timing is later at high elevations.
  • Births: Birth occurs in late summer and early autumn, generally January to March. Litters usually contain 1 to 6 young, and up to 8 has been reported for the group.
  • Newborns: Newborns are expected mainly from January to March, following the reported late summer to early autumn birth period. The documents do not give a separate emergence period or abundance peak.
  • Active period: The species is active during the day and retreats to winter burrows under rocks, logs and sphagnum. September to May is mapped as the main surface-active period, but exact onset and cessation vary with elevation, snow cover and temperature.
  • Winter inactivity: During winter, Alpine Water Skinks shelter in burrows beneath rocks, logs and sphagnum, including burrows in or under sphagnum that may be covered by snow. In the alpine and high-elevation range, this is generally June to August, but local timing varies with snow cover and temperature.
  • Highest clearing risk: Risk is highest from June to March. Winter works can crush or bury animals in refuges, while September to March includes mating, gravid females, births and newborns; April and May are transitional months with lower but ongoing risk.

Identification

The Alpine Water Skink is a compact, medium-sized skink associated with moist, open alpine habitat. Identification is most reliable when the dorsal and lateral stripe pattern is visible.

Adults are olive-brown to coppery brown above and may have a black vertebral stripe extending along the back. A black stripe occurs on each side, with a narrow yellow to cream dorso-lateral stripe below it. The lower flanks are pale yellow to cream with irregular black spots, and the underside is pale yellow to grey, sometimes with black spots.

The vertebral and lateral stripes may be weak or absent in northern populations. The species grows to about 85 mm snout to vent length, with Victorian sources giving about 80 mm.

Snout to vent length: Up to 85 mm

Typical colour: Olive-brown to coppery brown above, with black and yellow longitudinal stripes

Weight: Not reported in the supplied documents

Identification: Similar species

The species may occur with the Southern Water Skink, Eulamprus tympanum. The Alpine Water Skink is smaller, has a shorter head, and usually has a black vertebral stripe and a yellow dorso-lateral stripe. The Southern Water Skink can reach about 100 mm snout to vent length and lacks the black vertebral stripe.

  • Check the back for a black vertebral stripe before assigning a water skink to the Alpine Water Skink.
  • Treat weak or absent striping in northern populations with caution and use habitat, elevation and other body features together.

Identification: Field signs and survey handling

Individuals are active by day and may be seen basking on granite boulders, rocks, tussocks, fallen logs or sphagnum at the margins of small streams, bogs and seepages. They retreat into burrows under rocks, logs and sphagnum during winter.

The supplied documents do not describe diagnostic tracks, scats, calls, sloughs or eyeshine. Search effort should therefore focus on direct observations of basking skinks and inspection of suitable cover, burrow entrances and wet ground features by suitably experienced personnel.

  • Inspect rocks, logs, tussocks and sphagnum margins before moving or removing them.
  • Use a slow visual search in open, moist habitat and check drainage lines and nearby upslope areas, because individuals may occur hundreds of metres from wetter habitat.

Distribution: National range

The species has a fragmented, high-elevation distribution across south-eastern Australia. Records are concentrated on isolated montane and alpine sites separated by unsuitable lowland habitat.

The Alpine Water Skink occurs in New South Wales, the Australian Capital Territory and Victoria. In NSW it is recorded from the northern NSW tablelands and the south-eastern alpine region. In Victoria it occurs in the north-eastern alpine region, including Alpine National Park. In the ACT it occurs in the Brindabella and adjacent alpine areas.

The distribution is associated with the Australian Alps and high-elevation montane areas, including the NSW South Eastern Highlands and Northern Tablelands, the Australian Alps bioregion and adjoining high country in north-eastern Victoria.

States and territory: NSW, ACT and Victoria

Elevation range: Above 1,000 m to about 2,000 m

Extent of occurrence: 95,396 km², with a reported range of 40,671 to 118,976 km²

Area of occupancy: 940 km², with a reported range of 260 to 1,020 km², based on 2 km by 2 km grid cells

Distribution: Lineages and strongholds

Two disjunct lineages are recognised. The northern lineage occurs in montane sites on the northern NSW tablelands. The southern lineage occurs in alpine and sub-alpine areas of the ACT, south-eastern NSW and north-eastern Victoria.

Northern strongholds include Barrington Tops, Mount Royal, Mummel Gulf, Werrikimbe, Oxley Wild Rivers, Cathedral Rock, New England and Gibraltar Range national parks. Southern strongholds include Kosciuszko National Park and Alpine National Park.

  • Pepper and colleagues identified four evolutionary significant units within the northern lineage and three within the southern lineage.
  • All known populations should be treated as important for maintaining genetic diversity because sites are isolated and natural gene flow is likely to be limited.

Distribution: Population size and trend

No national estimate of mature individuals is available. The species is naturally fragmented into isolated high-elevation sites, and continuing declines are inferred or projected in distribution, habitat extent and quality, the number of populations and mature individuals.

The 2019 to 2020 fires affected known habitat. About 14 percent of alpine water skink habitat was burnt at high to very high severity and a further 25 percent at low to moderate severity. Future modelling indicates that up to 65 percent of climatically suitable habitat could be lost by 2050 under a high-emissions scenario.

Mature individuals: Unknown

Threat-defined locations: Two in the NSW assessment

Projected suitable habitat loss: Up to 65 percent by 2050 under the modelled A2 scenario

Habitat: Habitat types

Suitable habitat is usually high-elevation, moist and open, with persistent ground moisture, basking sites and dense low cover. Small changes to drainage or ground structure can affect both habitat quality and shelter availability.

The species occurs along small alpine streams, bogs, fens, wet heath, seepages, drainage lines and wet sod-tussock grassland. In the Snowy Mountains and Brindabella Range it is strongly associated with sphagnum bog, fen, wet heath and, less often, wet sod-tussock grassland.

Individuals may occur in moist open areas up to hundreds of metres upslope or away from the wettest habitat. Open dry sclerophyll woodland containing swamps, seepages and creeks is also identified as habitat in the northern NSW assessment.

Elevation: Usually above 1,000 m and up to about 2,000 m

Key wetland types: Sphagnum bog, fen, wet heath, seepage and wet tussock grassland

Water features: Small alpine streams, slow-moving streams and drainage lines

Habitat: Structural features

Important habitat features include granite boulders, exposed rocks, tussocks, sphagnum, fallen logs, mossy or herb-covered stream banks and moist ground cover. These features provide basking sites, prey habitat and refuges.

The habitat critical to survival includes known occupied areas and adjoining areas of similar moist, open, high-elevation habitat that could support natural range extension or managed translocation.

  • Retain sphagnum, tussock cover, rocks, logs and wet ground features within and beside the work area.
  • Maintain seepage lines, small streams and bog hydrology, including upslope water inputs and downstream flow paths.

Foraging habitat: Diet and feeding sites

The Alpine Water Skink feeds during the day in and around moist alpine ground cover and water features. Feeding can occur in both aquatic and terrestrial situations.

Recorded or inferred prey include aquatic and terrestrial invertebrates, tadpoles, small fish and smaller lizards. Occasional feeding on native fruit is also reported. An older source lists small skinks rather than small fish among possible prey.

Foraging habitat includes sphagnum, tussocks, wet heath, stream margins, seepages, drainage lines, rocks and logs. These areas support invertebrate prey and provide cover while the skink moves between basking and feeding sites.

Feeding period: Daytime

Main prey: Aquatic and terrestrial invertebrates, tadpoles, small fish and smaller lizards

Foraging range: No home-range estimate is available. Dispersal is estimated to be less than 1 km.

  • Avoid disturbing wet ground cover and stream-edge vegetation that supports prey and provides concealment.
  • Prevent sediment, pollutants and altered runoff from entering bogs, seepages and small streams.

Breeding habitat: Breeding biology

Breeding occurs in spring, with live young produced in late summer and early autumn. Breeding habitat is moist, open high-elevation habitat with nearby cover and basking sites.

Females are live-bearing. Mating occurs in spring and birth follows 10 to 12 weeks later. Females reach maturity at 2 to 3 years of age.

Males defend territories from other males and are more aggressive than males of some other water skink species. The supplied documents do not provide a species-specific clutch or nest structure because the young develop internally.

Mating season: Spring, generally September to November

Birth period: Late summer to early autumn, generally January to March

Reproductive mode: Live-bearing

Litter size: Usually 1 to 6 young; up to 8 is reported for the group in the NSW assessment

Gestation: 10 to 12 weeks

Age at maturity: Females mature at 2 to 3 years

Longevity: Estimated at 6 to 10 years; a Victorian assessment assumes about 8 years

Generation length: Unknown. Related water skinks have reported generation lengths of about 3 years and 4 to 7 years.

Breeding habitat: Breeding habitat features

Breeding habitat includes tussocks, rocks and logs in open, moist high-elevation areas with swamps, seepages, creeks, bogs and wet heath. Sphagnum and other dense low cover provide shelter around breeding areas.

Because populations are isolated and dispersal is limited, disturbance to a breeding site may not be offset by recolonisation from a nearby site.

  • Retain connected wet ground cover, rocks, logs and tussocks around occupied sites during clearing and construction.
  • Avoid works that dry, drain, inundate or fragment bog and seepage habitat during the breeding and birth period.

Sheltering habitat: Refuges

Shelter is provided by low, moist ground cover and cavities beneath natural surface features. Winter refuges are particularly associated with rocks, logs and sphagnum.

In winter, Alpine Water Skinks retreat to burrows beneath rocks, logs and sphagnum. Sphagnum cover is inferred to assist thermoregulation and shelter.

Suitable shelter also includes tussocks, mossy banks, fallen timber, granite boulders and dense wet heath. The supplied documents do not give burrow dimensions or a minimum cover depth.

Known refuge types: Burrows beneath rocks, logs and sphagnum

Shelter dimensions: Not reported

Winter behaviour: Retreats into ground refuges

  • Do not remove rocks, logs, tussocks or sphagnum from occupied or potentially occupied habitat without an approved fauna management procedure.
  • Inspect cover objects before disturbance and retain natural refuges in place wherever practicable.
  • Keep machinery, spoil, temporary access tracks and stockpiles out of bogs, seepages, stream margins and wet tussock habitat.

Threats: Clearing, construction and hydrology

The main risks are habitat loss and deterioration across isolated alpine sites. Fire, climate change, hard-hoofed animals, predators, recreation and development can act together, especially where ground cover has already been removed.

Ski resort development, tourism infrastructure, roads, dams, water diversion and other construction can remove habitat, fragment occupied sites or alter bog and stream hydrology. Development can dry sphagnum bogs, increase siltation, inundate habitat or change the amount and timing of water reaching seepages and streams.

The Snowy Hydro 2.0 assessment identified an estimated 630 ha project footprint within Kosciuszko National Park, including about 8 ha of sphagnum bog habitat. Potential impacts include drying of bogs after water drawdown, altered hydrology and changes to water quality.

  • Map bogs, fens, wet heath, seepages, drainage lines, stream margins and adjacent moist tussock habitat before finalising the work footprint.
  • Keep clearing, excavation, spoil placement, access tracks and temporary works outside occupied and suitable wet habitat wherever practicable.
  • Maintain natural drainage, seepage inputs and downstream flows, and prevent sediment or contaminated water from entering wetland habitat.
  • Treat isolated habitat patches as separate conservation units because natural recolonisation is unlikely across unsuitable lowland areas.

Threats: Fire and climate change

Increasing temperatures, altered snow cover, upslope movement of plants and more frequent or severe fires are expected to reduce suitable habitat and increase fragmentation. The species occurs on isolated high-elevation sites, so a single severe fire can affect a large proportion of a local lineage or population.

Fire removes ground cover and shelter, changes vegetation structure and may increase predation in open habitat. Recovery is slow in alpine areas because the growing season is short.

2019 to 2020 high to very high severity fire: Affected about 14 percent of alpine water skink habitat

2019 to 2020 low to moderate severity fire: Affected a further 25 percent of habitat

Projected climate-related habitat loss: Up to 65 percent of climatically suitable habitat by 2050 under the modelled A2 scenario

  • Avoid unnecessary ignition, hot works and fuel accumulation near occupied bog, seepage and wet heath habitat.
  • Protect unburnt refuges and retain surviving sphagnum, tussock, rock and log cover after fire.
  • Inspect fire-affected habitat for surviving skinks and refuges before rehabilitation, grading or debris removal.

Threats: Grazing, trampling and recreation

Feral horses, deer and pigs damage bogs and riparian habitat through trampling, pugging, wallowing and grazing. Cattle have also damaged sphagnum bogs. Recreational horse riding, walkers and vehicles can damage alpine vegetation, which recovers slowly.

Hard-hoofed animal impacts can be especially severe after fire because they delay the recovery of ground cover and can channelise water through seepage systems.

  • Exclude feral and domestic hard-hoofed animals from occupied bog and seepage habitat where practicable.
  • Keep recreational riding, vehicles and construction traffic away from wet ground cover, stream margins and bog systems.
  • Repair or close informal tracks that concentrate runoff or break up wetland vegetation.

Threats: Predators and other pressures

Feral cats and European red foxes prey on skinks. Predation risk is likely to increase after fire or trampling when ground cover is reduced and animals are more exposed.

Weed invasion is identified as an additional threat. The supplied documents do not identify a species-specific disease threat or a demonstrated road mortality pattern.

  • Limit habitat opening, artificial lighting and activities that remove ground cover around occupied sites.
  • Control feral predators and weeds through approved programmes that do not damage bogs, seepages or non-target fauna.
  • Record incidental mortalities and predator activity during project monitoring.

Survey methodology: 1. Diurnal visual searches

Survey alpine water skink habitat before works, especially high elevation moist areas above 1000 m. The species is diurnal and is most likely to be detected basking on rocks, logs, tussocks or sphagnum beside small streams, bogs, seepages and wet heath.

Undertake searches during daylight in warm, settled conditions when skinks are likely to bask.

Search slowly along small alpine streams, drainage lines, bog margins, seepages, wet heath and wet sod-tussock grassland.

Inspect exposed granite boulders, tussocks, sphagnum, logs and the margins of rocks and shallow watercourses.

Include suitable habitat up to hundreds of metres upslope from wetter areas, because the species is not restricted to the immediate stream edge.

Record the search date, start and finish times, weather, temperature if measured, observers, area searched, search route, habitat condition and all detections.

Activity period: Diurnal

Elevation: Above 1000 m to 2000 m

Estimated dispersal distance: Less than 1 km

  • Repeat searches across suitable habitat rather than relying on one visit.
  • Do not treat a negative daytime search as proof that the species is absent from fragmented or low-density habitat.
  • Avoid lifting or moving rocks, logs or sphagnum unnecessarily, because these features provide shelter and overwintering sites.

Survey methodology: 2. Targeted habitat assessment

Map all sphagnum bogs, fens, wet heath, seepages, wet tussock grassland, slow-moving streams and drainage lines within and adjoining the work area.

Map basking and shelter features, including granite boulders, rocks, logs, tussocks and sphagnum cover.

Assess whether suitable habitat continues into adjoining retained areas, and identify cleared land or other unsuitable habitat that may isolate subpopulations.

Use existing confirmed records and state biodiversity databases to identify nearby occupied sites and potential population boundaries before finalising the survey area.

  • Walk beyond the construction footprint where adjoining habitat could be affected by altered drainage, fire, trampling, dust or predator access.
  • Treat all isolated habitat patches as potentially important because the species has two disjunct lineages and limited dispersal.

Survey methodology: 3. Trapping and handling methods

The supplied documents do not specify a validated trapping design, trap-night total, transect length or minimum search duration for alpine water skinks.

Use trapping only where it has been approved by the relevant state or territory authority and designed by a suitably experienced herpetologist.

Select methods that do not damage sphagnum bogs or wet heath, and provide frequent checks, weather protection and immediate release where permitted.

  • Do not invent a survey effort standard for this species from the available documents.
  • Obtain project-specific advice on whether trapping is justified, because the species can be detected by targeted daytime searches and handling can damage sensitive habitat.

Survey methodology: Minimum effort and reporting

  • Complete a pre-clearance survey of every area containing or adjoining potential alpine water skink habitat, with the timing and repeat visits justified in the fauna management plan.
  • Document the area searched, observer effort, weather, habitat features, survey limitations, photographs and GPS locations for every detection.
  • Submit confirmed records, including reliable negative information where requested, to the relevant state wildlife database and the Atlas of Living Australia where appropriate.
  • Report records promptly to the project ecologist and the relevant approval holder, and update the fauna management plan if a new occupied site is found.
  • Retain voucher photographs and diagnostic notes, including the black vertebral stripe and yellow dorso-lateral stripe where visible, because the species can occur with the southern water skink.

Before habitat disturbance: Avoid and minimise

Avoid impacts to moist, high elevation habitat wherever practicable. Habitat loss, altered hydrology, fire, hard-hoofed animals and predation can compound impacts on isolated subpopulations.

Redesign the footprint to retain sphagnum bogs, fens, wet heath, seepages, wet tussock grassland, small streams and drainage lines.

Retain basking and shelter features, including granite boulders, rocks, logs, tussocks and sphagnum cover.

Keep occupied habitat connected to adjoining suitable habitat, and avoid creating new cleared or dry barriers between habitat patches.

Prevent changes to drainage, water diversion, damming, sediment movement and water quality that could dry or drown bog and streamside habitat.

  • Set site-specific no-go areas and buffers around occupied habitat, based on hydrology, slope, machinery reach, sediment movement and fire risk.
  • Do not apply a generic buffer distance where the documents provide no validated distance for this species.
  • Avoid locating compounds, access tracks, spoil, fill, lighting and stockpiles in or beside wet habitat.

Before habitat disturbance: Approvals and planning

Confirm whether the action requires referral or approval under the EPBC Act because the alpine water skink is nationally listed as Vulnerable.

Confirm the applicable state or territory threatened species listing, scientific licence, animal ethics, handling and relocation requirements before survey or works begin.

Prepare a fauna management plan that identifies habitat, survey results, exclusion areas, pre-clearance procedures, fauna handling, stop-work triggers, incident reporting and rehabilitation.

Commonwealth status: Vulnerable under the EPBC Act

NSW status: Vulnerable

Victorian status in the supplied assessment: Endangered in the 2021 assessment, with the 2023 regional guide also identifying the species as threatened

  • Obtain written approval from the relevant wildlife authority before capturing, handling, transporting or relocating a skink.
  • Use the most recent confirmed records and state database information when assessing whether the work area contains an important population.
  • Consult Traditional Owners where works affect Country within the species’ range and follow agreed requirements for cultural information and site protection.

Before habitat disturbance: Site preparation

Complete the pre-clearance survey immediately before works, because the species uses burrows under rocks, logs and sphagnum during winter.

Mark no-go habitat, basking features, shelter features, wetland edges and drainage lines on plans and on the ground.

Install exclusion fencing where it can keep machinery, vehicles, horses, livestock and people out of retained habitat without blocking necessary movement.

Brief all plant operators, supervisors and fauna spotter catchers on the species’ appearance, habitat and stop-work procedure.

  • Use machinery exclusion and access controls to prevent bog pugging, trampling, wallowing, sediment entry and accidental drying of wet habitat.
  • Stage works so that the smallest practicable area is exposed at one time and retained habitat remains available throughout the project.
  • Do not burn cleared material or undertake unplanned slashing in or beside alpine water skink habitat.

During habitat disturbance: Daily work controls

The fauna spotter catcher must have authority to stop work and must remain integrated with the construction supervisor and machinery operators. Work controls must protect both the animal and the wet habitat on which it depends.

Inspect exclusion fencing, no-go markers, drainage controls and sediment controls before work starts each day.

Keep machinery, vehicles, spoil, fill and personnel outside retained bog, seepage, wet heath and streamside habitat.

Use the minimum practicable work area and stop work during conditions that increase fire risk, runoff, bog damage or animal exposure.

Maintain a daily fauna log recording personnel, weather, work areas, inspections, detections, incidents, handling and releases.

  • Keep a trained fauna spotter catcher present whenever vegetation, rocks, logs, sphagnum or soil that may provide shelter is disturbed.
  • Require the operator to stop immediately when directed by the fauna spotter catcher or environmental officer.
  • Do not allow recreational or project horse riding through alpine water skink habitat.

During habitat disturbance: Habitat feature handling

Inspect rocks, logs, tussocks and sphagnum before disturbance because the species shelters and overwinters beneath or within these features.

Avoid removing or crushing habitat features wherever practicable, particularly sphagnum cover, bog margins, seepages and streamside vegetation.

Where an approved method requires moving a rock or log, have the fauna spotter catcher inspect beneath and around it first, then place it in nearby retained habitat if safe and authorised.

Protect drainage lines and bog hydrology from diversion, damming, sediment, compaction and rapid runoff.

  • Do not move habitat features across roads, cleared land, catchments or unsuitable habitat.
  • Treat burrows under rocks, logs and sphagnum as potential shelter sites and do not seal or fill them without inspection and approval.
  • Do not handle an animal merely to improve a photograph or confirm identification.

During habitat disturbance: Animal encounters and stop-work triggers

Stop work in the immediate area if an alpine water skink is found, injured, trapped or exposed by clearing.

Allow the animal to move into nearby retained habitat where it can do so safely and without being driven towards machinery, roads or water hazards.

If capture is necessary, only an authorised and experienced person may handle the skink under the relevant approval and fauna management plan.

If relocation is approved, use the closest suitable retained habitat within the same occupied area, avoiding movement between isolated sites or lineages.

  • Do not relocate a skink more than necessary, because estimated dispersal is less than 1 km and the species is associated with isolated habitat patches.
  • Place an injured animal in a secure, temperature-appropriate container and transfer it as soon as practicable to an approved wildlife carer or veterinarian.
  • Stop work if a second animal is found, if the habitat differs from the approved impact assessment, if exclusion fencing fails, or if machinery enters a no-go area.
  • Resume work only after the fauna spotter catcher and environmental officer have assessed the site, recorded the incident and authorised resumption.

After habitat disturbance: Post-clearance checks

Post-clearance work must confirm that no animal or shelter feature has been left exposed and that retained habitat remains functional. Reporting should support state and Commonwealth compliance and improve future management.

Inspect the cleared area, retained habitat edge, access routes, spoil areas and drainage controls at the end of each work shift and after major weather events.

Check for exposed or damaged rocks, logs, tussocks, sphagnum, burrows, seepages and stream banks.

Remove temporary barriers only when the fauna management plan confirms that construction risks have ended and retained habitat is stable.

  • Record all animals found after clearing, including their location, condition, action taken and release or treatment outcome.
  • Repair damaged exclusion fencing, drainage controls and no-go markers immediately.
  • Escalate any drying, sedimentation, bog pugging, fire damage or predator access to the environmental officer.

After habitat disturbance: Monitoring and reporting

Monitor retained and rehabilitated habitat using the same mapped search areas and recording methods used during pre-clearance surveys.

Compare habitat condition, water presence, sphagnum cover, tussock cover, logs, rocks and evidence of trampling over time.

Report new detections, mortality, injuries, habitat damage, unapproved handling and stop-work events to the approval holder and relevant authority.

  • Submit required records to the relevant state wildlife database and provide EPBC compliance reports where the approval requires them.
  • Keep survey data, photographs, GPS files, fauna registers, approvals, incident reports and rehabilitation results with the project environmental records.
  • Review monitoring results with the project ecologist and change controls if skinks or suitable habitat are found outside the approved impact area.

After habitat disturbance: Residual impacts

Assess whether permanent habitat loss, fragmentation, altered hydrology or reduced habitat quality remains after works.

Apply any approved offset, compensatory habitat or conservation measure required under the EPBC Act or state approval.

Do not use rehabilitation or offsets as a reason to remove avoidable occupied habitat.

  • Document the area and condition of habitat retained, disturbed, restored and permanently lost.
  • Obtain approval before changing the agreed impact area or rehabilitation design.

Rehabilitation actions: Restore habitat structure and hydrology

Rehabilitation should recreate moist, open, high elevation habitat with shelter, basking sites and stable water movement. It should be based on a nearby undisturbed reference site and supervised by an alpine wetland ecologist where bog or seepage systems are affected.

Reinstate natural seepage, bog and drainage-line hydrology, avoiding channelisation, drying, damming and rapid concentrated flows.

Revegetate with locally sourced native species from the matching alpine wet heath, sphagnum bog, fen or wet tussock community.

Re-establish native tussocks, sphagnum and wet ground cover around streams, seepages and bog margins where these features formed part of the pre-works habitat.

Place locally appropriate rocks and logs in retained and rehabilitated areas to provide basking and shelter features, subject to approval and biosecurity controls.

  • Do not import soil, rocks, logs, sphagnum or plant material from sites that could introduce weeds, pathogens or unsuitable genetic material.
  • Keep rehabilitation areas free from machinery, livestock, feral horses, deer, pigs and recreational horse riding while vegetation and bog structure recover.
  • Do not install nest boxes for this species unless monitoring identifies a specific, approved reason, because the supplied documents identify rocks, logs, tussocks and sphagnum rather than tree hollows as its shelter features.

Rehabilitation actions: Manage weeds, predators and fire

Control weeds before seed set and prevent weed establishment in disturbed wet habitat.

Manage feral horses, deer and pigs to prevent trampling, pugging, wallowing and grazing of recovering bogs and seepages.

Apply approved cat and fox control where monitoring shows increased predation risk, especially where fire or clearing has removed ground cover.

Develop fire controls that protect rehabilitated habitat from high severity or unnecessarily frequent fire.

  • Do not use broadscale fire in or beside alpine water skink habitat without ecological assessment and approval.
  • Maintain ground cover and shelter after disturbance because open, recently burnt habitat may increase exposure to feral cats and foxes.

Rehabilitation actions: Success measures and monitoring

Set measurable rehabilitation targets for stable water flow, bog or seepage extent, native tussock and sphagnum recovery, weed cover, shelter features and absence of pugging.

Inspect rehabilitation after construction, after heavy rainfall, through the first growing season and at the intervals required by the approval.

Repeat targeted daytime searches when habitat has recovered sufficiently to provide basking and shelter opportunities, using the same mapped effort and conditions where practicable.

Continue monitoring until the site supports the agreed habitat condition and no construction-related barrier, drying, sedimentation or predator control failure remains.

  • Record photographs from fixed points, GPS boundaries, vegetation condition, hydrology, grazing or trampling, fire effects and all alpine water skink detections.
  • Treat a new detection in rehabilitated habitat as evidence of use, but do not rely on detection alone as proof that habitat function has been restored.
  • Report failed targets and implement corrective actions, such as repairing drainage, replanting native cover, replacing shelter features or increasing weed and pest control.

Sources