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Kuchling's Snake-necked Turtle (Chelodina kuchlingi)

Kuchling's Snake-necked Turtle is a very rare freshwater turtle known from a limited area of Western Australia, with records associated with the eastern Kimberley. Its restricted distribution, lack of recent specimens and reported threats from habitat destruction and water pollution make any suitable wetland, river margin or vegetated freshwater habitat on a project site important to assess before disturbance.

Conservation status

Western Australia, Biodiversity Conservation Act 2016: Critically endangered.

Breeding season

Kuchling's Snake-necked Turtle is associated with wet-season activity and breeding, but nesting may extend into the early dry season. Dry-season aestivation and eggs in soil can increase the risk from clearing when turtles cannot move away.

Reproductive mode: Egg laying, oviparous

Clutch size: Not recorded for this species

Incubation: Not recorded; development may pause while nests remain flooded

Size at hatching: Not recorded

Age at maturity: Not recorded

Nest or egg sites: Sandy or muddy banks, or sandy or loamy soil near the water's edge

Breeding frequency: Not recorded

Confirm timing with the relevant Western Australian authority and local surveys, because rainfall, flooding and drying conditions can shift breeding, emergence, activity and aestivation periods.

  • Gravid females: Gravid females of the related C. oblonga have been recorded as late as September when waterholes remain inundated. The full period during which females carry eggs is not recorded for Kuchling's Snake-necked Turtle.
  • Nesting: The species nests during the wet season and nesting is also reported in the early dry season. The February to July timing comes from C. oblonga, which is reported as a synonym of C. kuchlingi, and should be treated as a planning guide rather than a confirmed species calendar.
  • Incubation: Eggs are in nests from laying until emergence in the following wet season, so an individual nest may remain occupied across the wet and dry seasons. Development can be arrested while nests are flooded and resumes as the ground dries; no fixed incubation length is recorded.
  • Hatchlings: Hatchling emergence is reported in the wet season following nesting. The month mapping uses the typical northern Australian wet-season period, because the documents do not give exact emergence months for this species.
  • Active period: The species is reported to be highly active during the wet season, foraging and moving between water bodies. The month mapping uses the typical northern Australian wet-season period, as no species-specific months are given.
  • Dry season inactivity: During the dry season, the species may aestivate in mud or burrow into damp substrate near remaining waterholes. The month mapping uses the typical northern Australian dry-season period.
  • Highest clearing risk: Risk is highest from nesting in February to July, eggs remaining in soil, and dry-season aestivation from about May to October. Wet-season clearing can also affect hatchlings and turtles moving between water bodies, so local rainfall timing must guide the final work window.

Identification

This is a long-necked freshwater turtle with a dark, rugged carapace. The species is rare and taxonomically important, so suspected records should be photographed and referred to a suitably experienced reptile taxonomist.

Chelodina kuchlingi has a notably elongated neck and a typically dark carapace with a rugged texture.

The supplied documents do not provide measurements, weight, head markings, plastron pattern or other numerical field characters.

Diagnostic appearance: Elongated neck and dark, rugged carapace

Size: Not reported

Identification: Sexes and similar species

Males generally have a thicker, longer tail and are slightly smaller than females.

Other Chelodina species occur in Australia, and the supplied documents do not provide a comparison table for separating this species from other long-necked turtles. Do not rely on neck length or dark shell colour alone for a definitive identification.

  • Record clear photographs of the carapace, plastron, head, neck and tail where this can be done safely.
  • Retain the exact location, waterbody name, date and habitat description with the record.
  • Seek expert confirmation before treating an observation as a confirmed species record.

Identification: Field signs

The supplied documents do not describe tracks, scats, calls, sloughs, eyeshine or distinctive basking signs.

Females are reported to lay eggs in nests dug into sandy or muddy banks. A suspected nest or disturbed nesting bank should be treated as a potential fauna site and should not be excavated.

  • Inspect sandy and muddy banks for possible nesting activity without disturbing the substrate.
  • Record turtles, nests and basking or swimming observations with photographs and location data.
  • Use a qualified fauna spotter catcher and obtain project-specific advice before handling or relocating an animal.

Distribution

The species is endemic to a restricted part of Western Australia. The supplied sources do not provide a mapped national range, confirmed population estimate or current population trend.

The species is recorded from Western Australia, with the revised type locality at Parry's Lagoon in the eastern Kimberley. The earlier type locality was reported as Kalumburu.

The supplied documents do not assign the species to an IBRA bioregion beyond identifying the eastern Kimberley, and they do not confirm occupied sites outside this area.

Australian states: Western Australia only in the supplied documents

Known region: Eastern Kimberley

Revised type locality: Parry's Lagoon

Earlier type locality: Kalumburu

  • Treat freshwater sites in the eastern Kimberley as potential habitat where the species has not been excluded by targeted survey.
  • Do not assume that an absence of recent records means the species is absent, because the last specimens referenced in the supplied material were collected in the 1960s.

Distribution: Population and trend

No population size, density, subpopulation count or quantified trend is provided.

The WA Museum material states that the last specimens were collected in the 1960s and that the revised distribution raised concern about the species' conservation status.

Population size: Not known from the supplied documents

Population trend: Not quantified; concern is associated with the scarcity of records

Last specimens referenced: Collected in the 1960s

  • Report any confirmed record promptly to the relevant Western Australian conservation authority and project approval contacts.
  • Treat a confirmed record as significant when planning clearing, access, dewatering or works near freshwater habitat.

Habitat

Kuchling's Snake-necked Turtle is associated with freshwater habitats that provide slow-moving water, dense vegetation and suitable banks. The supplied documents do not provide elevation limits or a defined vegetation community.

Preferred habitats include slow-moving waters such as swamps and rivers surrounded by dense vegetation.

These habitats provide cover and foraging opportunities. Sandy or muddy banks are also relevant because they may be used for nesting.

Water regime: Slow-moving freshwater

Habitat examples: Swamps and rivers

Important cover: Dense surrounding vegetation

Elevation limit: Not reported

  • Map swamps, river channels, lagoons, billabongs and connected wetland margins before clearing or construction.
  • Retain dense vegetation around suitable freshwater habitat where practicable.
  • Identify sandy and muddy banks separately from the open water footprint because they may support nesting.

Foraging habitat

The species feeds in freshwater habitat. The supplied information supports a general focus on aquatic prey and vegetated water margins, but does not describe feeding distances, home ranges or prey densities.

The diet consists primarily of small aquatic invertebrates, with occasional plant material.

Foraging is therefore likely to be associated with freshwater areas that support aquatic invertebrates, including slow-moving water and vegetated margins. The supplied documents do not identify particular food plants or prey taxa.

Main food: Small aquatic invertebrates

Additional food: Occasional plant material

Foraging range: Not reported

  • Avoid unnecessary disturbance, sediment input and pollution in slow-moving water and vegetated wetland margins.
  • Include shallow water, submerged habitat and vegetated edges in the habitat assessment rather than assessing only the main channel.
  • Do not infer a foraging range or home-range size from the supplied information.

Breeding habitat

Breeding is reported during the wet season. Females lay eggs in nests dug into sandy or muddy banks, but the supplied documents do not provide clutch size, incubation period or age at maturity.

Breeding is associated with higher water levels during the wet season.

Nesting habitat consists of sandy or muddy banks near suitable freshwater habitat. Bank disturbance, vehicle access and works that alter water levels may affect breeding habitat.

Breeding season: Wet season

Clutch size: Not reported

Incubation period: Not reported

Age at maturity: Not reported

Lifespan: Not reported

Nest substrate: Sandy or muddy banks

  • Survey sandy and muddy banks near slow-moving water before earthworks or access works.
  • Fence or otherwise protect identified nests and nesting banks from machinery, vehicles and unnecessary foot traffic.
  • Confirm the local breeding calendar with the relevant Western Australian authority because the supplied documents give a season but no months.

Sheltering habitat

Dense vegetation around freshwater habitat provides cover, and the species can remain submerged for extended periods. No refuge dimensions, burrow use or basking-site requirements are provided.

Dense vegetation surrounding swamps and rivers is reported to provide cover.

The species can remain submerged for extended periods and may use its long neck to reach air while exposing little of its body. The supplied documents do not state whether it uses burrows, hollows, woody debris or particular underwater refuge structures.

Documented cover: Dense vegetation around freshwater habitat

Submergence: Can remain submerged for extended periods

Refuge dimensions: Not reported

Burrows and hollows: Not reported

  • Retain dense vegetation at the edges of suitable freshwater habitat where possible.
  • Avoid assuming that a site is unsuitable because turtles are not visible at the surface.
  • Use low-disturbance search methods and follow approved handling procedures if a turtle must be removed from an active work area.

Threats: Development pressures

The supplied information identifies habitat destruction, water pollution and illegal collection for the pet trade as threats. The species' restricted known distribution and scarcity of recent records increase the need for careful planning around freshwater habitat.

Clearing or modification of swamps, rivers, wetland vegetation and nesting banks can remove habitat or reduce cover.

Water pollution can affect aquatic feeding habitat. Changes to water levels may also affect the higher-water conditions associated with wet-season breeding.

Documented threats: Habitat destruction, water pollution and illegal pet trade

Relevant project pathways: Clearing, bank disturbance, pollution and hydrology change

  • Avoid clearing dense vegetation around suitable freshwater habitat where practicable.
  • Prevent sediment, fuel, chemicals and other pollutants from entering swamps, rivers and lagoons.
  • Assess dewatering, drainage, crossings and bank stabilisation for effects on water levels, flow and nesting banks.
  • Keep machinery and vehicles off sandy and muddy banks unless access is approved and managed.

Threats: Other risks

Birds of prey and larger aquatic species are identified as natural predators.

The supplied documents do not provide species-specific information on roads, fire, disease, fragmentation effects or road mortality. These risks should be assessed for the particular project rather than assumed to be absent.

Natural predators reported: Birds of prey and larger aquatic species

Road, fire and disease evidence: Not provided in the supplied documents

  • Control access to occupied habitat and prevent unnecessary handling or collection.
  • Include road crossings, fire planning and disease hygiene in the site risk assessment where works occur near occupied freshwater habitat.
  • Do not move turtles between waterbodies unless this is authorised and directed by the relevant wildlife authority.

Survey methodology: 1. Aquatic habitat inspection

No species-specific survey guideline is provided in the supplied documents. Survey effort should focus on slow-moving freshwater habitats, including swamps, rivers and densely vegetated margins, with particular attention to the wet season and animals that remain mostly submerged.

Inspect all slow-moving waterbodies, swamps, river margins and densely vegetated wet areas that could be affected by the project.

Search vegetated banks, shallow margins, muddy or sandy banks and areas with cover where a long-necked freshwater turtle could shelter or forage.

Record waterbody type, connectivity, bank condition, vegetation cover, water quality and any turtle observations or signs.

Survey methodology: 2. Daytime visual search

Undertake systematic searches from the bank and, where safe and authorised, by wading or boat in suitable freshwater habitat.

Search slowly and quietly because the species can remain submerged for extended periods and may expose only its head while breathing.

Repeat searches across representative habitat rather than relying on a single observation point.

Survey methodology: 3. Spotlighting and aquatic trapping

Use night spotlighting along accessible water margins and through dense aquatic vegetation, particularly during the wet season when water levels are higher and breeding activity is expected.

Use only approved, species-appropriate aquatic trapping methods where a qualified ecologist considers them necessary and where animal ethics, access and permit requirements have been addressed.

Check any trap frequently enough to prevent drowning, overheating, predation or other harm, and release captured animals immediately at the capture location unless an authorised wildlife handler directs otherwise.

Record the date, start and finish times, weather, water conditions, search route, trap type, trap locations, trap nights and all captures or non-detections.

Survey methodology: 4. Minimum effort and reporting

  • Define survey areas before fieldwork and cover every suitable waterbody and connected wetland within the proposed disturbance area.
  • Use more than one survey method where access, safety and permits allow, because submerged animals may be missed by bank searches alone.
  • Document survey timing, weather, water levels, observer names, equipment, routes, effort and detection results, including nil records.
  • Have a qualified person assess whether the survey adequately covers the species’ potential habitat before clearing starts.
  • Submit confirmed records, including location coordinates and supporting photographs where available, to the relevant Western Australian wildlife database and any other applicable state database.
  • Retain survey data and map all occupied, potentially occupied and connected habitat in the project environmental records.

Before habitat disturbance: Avoid and minimise

The supplied records indicate a very restricted Western Australian distribution and concern about the species because the last specimens were collected in the 1960s. Treat suitable freshwater habitat in the eastern Kimberley as potentially significant until targeted survey and agency advice establish otherwise.

Avoid clearing or isolating slow-moving waters, swamps, river margins and dense wetland vegetation that could provide cover or foraging habitat.

Retain connected waterbodies, vegetated banks, sandy or muddy nesting banks and natural shelter wherever practicable.

Keep project access routes, stockpiles, sediment controls and machinery outside retained wetland and river-margin habitat.

Before habitat disturbance: Approvals and planning

Confirm the current Western Australian conservation listing, wildlife authorisations and any project-specific permit requirements before survey, trapping, handling or relocation.

The supplied information states that the species is not listed under the EPBC Act, but the project officer should verify the current national protected-matters position before finalising approvals.

Prepare a fauna management plan that sets out survey results, exclusion areas, handling authority, stop-work triggers, wetland protection measures and incident reporting.

Stage works so that the smallest practicable area is opened at one time and retained habitat remains connected to suitable freshwater habitat.

Before habitat disturbance: Site preparation

  • Complete targeted pre-clearance searches of all suitable freshwater habitat and connected wetland margins before machinery enters the work area.
  • Clearly mark no-go areas, retained vegetation, waterbody buffers and access routes on plans and on the ground.
  • Install exclusion fencing where it can prevent entry into retained wetland habitat without blocking necessary movement between connected waterbodies.
  • Brief all operators and supervisors on the species’ appearance, submerged behaviour, habitat and the site stop-work procedure.

During habitat disturbance: Daily controls

Keep machinery away from retained freshwater habitat and require close communication between the fauna spotter catcher, plant operators and site supervisor. The species may be difficult to detect because it can remain submerged for long periods.

  • Inspect exclusion fencing, no-go markers, sediment controls and wetland protection measures before work starts each day.
  • Use a fauna spotter catcher to inspect the active work area and the immediate edge of any freshwater habitat before vegetation removal, excavation, pumping or vehicle access.
  • Keep plant, spoil, fuels and wash-down water out of swamps, rivers, water margins and connected drainage lines.
  • Stop work during unsafe conditions, including poor visibility, uncontrolled water movement or any event that prevents the spotter catcher from seeing the work area.

During habitat disturbance: Spotter catcher and habitat handling

  • Position the spotter catcher where they can maintain continuous communication with the operator and see the ground, water margins and material being disturbed.
  • Move vegetation, bankside material and other cover slowly and in stages so an animal can be detected before the next piece of material is removed.
  • Do not capture, handle or relocate a turtle unless the person is authorised, competent and operating under the approved fauna management plan.
  • Do not drain, fill, excavate or obstruct a wetland or watercourse containing a suspected turtle until the fauna spotter catcher and site supervisor have assessed the risk.

During habitat disturbance: Animal found, injury and stop work

  • Stop the affected activity immediately if a turtle is found in the work area or if a suspected turtle is trapped, injured or unable to leave.
  • Keep people, vehicles and machinery away from the animal and prevent it from being handled by unauthorised workers.
  • Have an authorised wildlife handler assess the animal and, where approved, release it into nearby retained habitat with suitable freshwater cover and connectivity.
  • Do not move the animal to an isolated waterbody or release it outside the approved relocation area.
  • Take injured animals promptly to an approved veterinarian or wildlife carer and record the incident, treatment pathway and final outcome.
  • Stop work and seek ecological or agency advice if more than one animal is found, if suitable habitat is being isolated, or if the approved relocation area is unavailable.

During habitat disturbance: Records and incidents

  • Record every sighting, capture, handling event, relocation, injury, mortality and stop-work event with coordinates, date, time, habitat description and photographs where safe.
  • Record the work activity, machinery involved, people present, controls used, action taken and the time work resumed.
  • Notify the project environmental officer and relevant wildlife authority of reportable incidents in accordance with the approval and fauna management plan.

After habitat disturbance: Post-clearance checks

Post-clearance checks should confirm that no turtle has been left in an isolated or damaged waterbody and that retained freshwater habitat remains usable and connected. The limited distribution and historical lack of recent specimens warrant careful record keeping and follow-up.

  • Inspect cleared margins, temporary access tracks, excavations, dewatered areas and retained wetland edges for stranded, injured or trapped turtles before the area is handed back to construction.
  • Check that temporary fencing, ramps, escape routes and water controls have not trapped animals or blocked movement between connected freshwater areas.
  • Remove temporary materials, spoil and rubbish that could obstruct water flow, cover habitat or create hazards for aquatic fauna.

After habitat disturbance: Monitoring and controls

  • Continue monitoring retained swamps, river margins and connected freshwater habitat for the period specified in the fauna management plan and approvals.
  • Inspect wetland protection measures after rain, flooding, earthworks and changes to water levels, and repair them promptly.
  • Repeat targeted searches if construction changes water levels, bank structure, vegetation cover or connectivity.

After habitat disturbance: Reporting and offsets

  • Provide the regulator and relevant wildlife database with verified records, survey results, incidents, relocation outcomes and post-clearance monitoring results.
  • Assess any unavoidable loss or degradation of potential habitat against the applicable Western Australian approval requirements.
  • Implement approved offsets or compensatory habitat measures where required, and document their location, management actions and performance results.

Rehabilitation actions: Wetland and bank restoration

Rehabilitation should restore connected freshwater habitat with dense native cover, stable banks and suitable wetland water conditions. The supplied documents do not identify particular plant species, habitat dimensions or rehabilitation timeframes, so site-specific designs should be developed with the relevant Western Australian authority.

  • Reinstate natural drainage and water retention patterns where construction has altered swamps, river margins or connected wet areas.
  • Stabilise sandy and muddy banks without replacing natural habitat with hard structures unless engineering and ecological assessments show that this is necessary.
  • Replant disturbed wetland and bank areas with locally appropriate native vegetation that provides dense cover and foraging habitat.
  • Maintain connectivity between rehabilitated waterbodies and retained freshwater habitat.

Rehabilitation actions: Habitat features and threats

  • Retain or reinstate natural aquatic cover, leaf litter, woody debris and other site-appropriate shelter features where they will not obstruct safe water flow.
  • Control weeds so dense native wetland and bank vegetation can re-establish.
  • Prevent contamination from sediment, fuel, chemicals and polluted runoff entering rehabilitated water.
  • Manage introduced predators and fire in accordance with the approved site plan, recognising that the supplied documents do not specify species-specific predator or fire prescriptions.

Rehabilitation actions: Monitoring and success measures

  • Monitor water quality, water levels, bank stability, native vegetation cover, weed presence and connectivity between waterbodies.
  • Use repeat daytime searches, night spotlighting and other approved methods to check whether turtles use rehabilitated habitat, with effort and conditions recorded each time.
  • Set success measures in the rehabilitation plan for vegetation establishment, stable wetland function, retained connectivity, absence of uncontrolled pollution and confirmed fauna use.
  • Adapt planting, erosion control, weed control or water management if monitoring shows that suitable freshwater cover or connectivity is not being restored.

Sources