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Wallum Rocket Frog (Litoria freycineti)

The wallum rocket frog is a moderate-sized terrestrial frog of coastal wallum heath, including sedge swamps, drainage lines and perched lakes, from Fraser Island in Queensland to Jervis Bay in New South Wales. It is Vulnerable in Queensland and occurs in fragmented, acid wetland habitats that can be affected by clearing, altered hydrology, fire, weeds, development and construction activity.

Conservation status

Queensland, Nature Conservation Act 1992: Vulnerable.

Breeding season

Wallum rocket frogs breed in spring and summer, usually after rain. Eggs, tadpoles and metamorphs can be present for several months after breeding begins, so avoid clearing, draining or dewatering wetland margins during the warm, wet part of the year.

Reproductive mode: Egg laying. Amplexus is axillary.

Clutch size: Not recorded.

Incubation: Not recorded.

Size at hatching or birth: Not recorded.

Age at maturity: Not recorded.

Nest or egg sites: Eggs are laid as a single layer on the bottom or substrate of shallow water, including temporary swamps, pools, ponds, stream pools and ditches.

Breeding frequency: Not recorded; breeding is documented in spring and summer after rain.

Confirm timing locally before works, because rainfall and warm-night conditions can extend calling, breeding, tadpole development and frog movement beyond the typical spring to summer period.

  • Calling: Males call on warm nights in spring and summer, often after rain. Calling may extend outside the usual period when wet conditions occur, but no month-specific peak is recorded.
  • Egg laying: Egg laying is documented in spring and summer after rain. Eggs are attached to the substrate or laid on the bottom of shallow temporary water bodies.
  • Tadpoles: Tadpoles occur after spring and summer breeding and may remain in temporary water for less than 60 days. Follow-up rainfall may be needed for tadpoles in temporary puddles to reach metamorphosis.
  • Metamorphs: Metamorphosis can occur less than 60 days after larval development begins, so metamorphs may occur from spring into autumn when breeding follows rain. The exact timing of juvenile emergence is not recorded.
  • Active period: Species-specific activity months outside breeding are not recorded. For planning, movement and calling are most likely in warm, wet spring and summer conditions, with activity extending after rain; adults can also occur in forest away from water.
  • Highest clearing risk: Risk is highest from spring through summer and can extend into autumn after rain, when eggs, tadpoles, metamorphs and active adults may be concentrated around temporary pools, wet ground and sedge margins. No month-specific peak is recorded.

Identification

The wallum rocket frog is a moderate-sized, mainly terrestrial frog with a warty back, reduced toe pads and a distinctive dark facial stripe. It is most likely to be detected by its rapid call during wet weather and the spring to summer breeding period.

Adults have a fawn or grey back with irregular darker spots, splotches or markings. A dark stripe runs from the snout through the eye to the shoulder, with a white break in front of the eye. The back is typically warty and the underside is coarsely granular.

The underside is mostly white. Breeding males may have dark flecking along the jaw line. The rear thighs are brown or grey-brown with cream or fawn spots.

Adult males: 34 to 39 mm snout to vent length.

Adult females: 39 to 42 mm snout to vent length.

Weight: Not stated in the supplied documents.

Identification: Features separating it from similar frogs

The fingers are free of webbing, while the toes are only partly webbed. Finger discs and toe pads are much reduced compared with tree-dwelling Litoria species, so this frog is not a good climber.

The related striped rocket frog, Litoria nasuta, may occur in disturbed areas and can compete with the wallum rocket frog. The two species rarely occur together except at disturbed sites. Identification should therefore use the full combination of facial stripe, warty back, reduced pads, habitat and call rather than colour alone.

Identification: Calls, tadpoles and field detection

The call is a rapid series of yaps or duck-like quacks. It may also sound quavering. Males call from wet ground near water, usually among sedges.

Tadpoles are deep-bodied with moderately high fins, an angular snout and laterodorsal eyes. They are dark grey or grey-brown above, with a silver-white underside that may have a copper-pink sheen. The tail muscle and fins are strongly suffused with brown.

Tadpoles are mainly bottom-dwelling and may be found in shallow temporary pools. Eggs are laid in shallow water, attached to the substrate according to the supplied field profile.

Maximum tadpole size: 53 mm.

Tadpole development: Less than 60 days to metamorphosis.

  • Listen for the rapid yapping or duck-like quacking call after rain, especially in spring and summer.
  • Search wet ground, sedge bases and the margins of ephemeral pools rather than relying on arboreal searches.
  • Do not identify small brown frogs from colour alone. Check the facial stripe, warty dorsum, reduced pads and partial toe webbing.

Distribution: National range

The wallum rocket frog occupies lowland coastal areas of Queensland and New South Wales. Its distribution is associated with coastal sandy deposits and wallum habitats, and the supplied sources describe a fragmented range with generally low abundance in at least part of the range.

In Queensland, the species is recorded from Fraser Island, Moreton Island, Cooloola, Bribie Island and North Stradbroke Island, with other coastal wallum areas included in the broader range description.

In New South Wales, the range extends south along the eastern coast to Jervis Bay. The supplied sources do not provide a complete locality list for New South Wales.

Queensland range: Fraser Island, Moreton Island, Cooloola, Bribie Island, North Stradbroke Island and other coastal wallum areas.

New South Wales range: Eastern coastal lowlands south to Jervis Bay.

Latitude range given: Approximately 25° 6' south at Fraser Island to 35° 08' south at Jervis Bay.

Distribution: Strongholds and population information

Named Queensland strongholds include Fraser Island, Moreton Island, Cooloola, Bribie Island and North Stradbroke Island. Moreton Bay Ramsar site documentation identifies the species as an acid wetland dependent frog with a highly fragmented distribution and generally low abundance.

The supplied documents do not provide a reliable national population estimate, a site density, or a quantified population trend. Population status at many sites is described as unknown because regular monitoring has not been undertaken.

Estimated total population in Moreton Bay assessment: Thousands, with the exact population size unknown.

Moreton Bay Ramsar site occurrence: Estimated to support at least 1% of the Australian population.

Population trend: Not quantified in the supplied documents; many site populations have unknown status.

Distribution: Bioregional context

The species is included among priority frog species mapped for the South East Queensland bioregion. In that assessment, potential habitat was inferred by reference to habitat requirements and distribution patterns of the related wallum sedge frog, because there were insufficient site data to build a statistical model specifically for the wallum rocket frog.

Habitat: Wetland and vegetation types

Wallum rocket frogs are associated with coastal and sub-coastal wet heath on sandy soils and sandstone. They use both wetland margins and nearby terrestrial vegetation, so habitat assessment should extend beyond the visible waterbody.

Core habitat includes coastal wet heath, sedge swamps, drainage lines, ephemeral swamps and perched lakes. The species may also occur in eucalypt forest near wet heath and some distance from standing water.

Suitable sites are typically low-nutrient, acidic wetlands on coastal sand deposits. Wallum ponds may contain water with low pH and high tannin levels, conditions that the tadpoles can tolerate.

  • Inspect sedge swamps, wet heath, drainage lines and the margins of perched lakes.
  • Include adjacent eucalypt forest and other terrestrial areas between wetland patches in habitat assessments.
  • Treat shallow temporary pools as potential breeding habitat even when they are dry during the survey period.

Habitat: Structural features and site limits

Important structural features include dense sedges, wet ground, shallow temporary water, matted or emergent vegetation and connected wet heath around drainage lines and swamps.

The supplied documents do not provide a reliable elevation limit, altitude range, vegetation height, patch size or minimum buffer distance. The species is consistently described as a coastal lowland frog.

Elevation: No numerical elevation range is provided; records and habitat descriptions are for coastal lowlands.

Climate and hydrology: Breeding is associated with spring and summer rain, and habitat depends on suitable wetland water levels and water quality.

Foraging habitat: Tadpole feeding

The supplied documents provide clear information on tadpole feeding but do not state the adult diet. Tadpoles feed in the bottom of shallow waterbodies, while adults are terrestrial around wet heath, sedges and nearby forest.

Tadpoles are mainly bottom-dwelling. They feed on detritus, dead insects and worms in temporary swamps and pools.

Wallum wetlands can be acidic and tannin-rich. The tadpoles of wallum frogs are adapted to these conditions.

  • Protect shallow pool substrates and the detrital layer used by bottom-feeding tadpoles.
  • Prevent sediment, biocides and other contaminants from entering temporary breeding pools.

Foraging habitat: Adult foraging area

Adults are terrestrial and may be found around wet heath, sedge swamps, drainage lines and nearby eucalypt forest, including areas some distance from water.

The supplied documents do not identify adult prey, food plants, daily foraging distances or home range. Do not assume that the breeding pool alone represents the full area used by adults.

  • Retain terrestrial vegetation around wetland margins and between wetland patches during clearing and construction.
  • Search adjacent forest and wet heath as well as the immediate pool edge.

Breeding habitat: Breeding biology

Breeding occurs in shallow, temporary water after rain. Males call from wet ground among sedges, and larvae develop rapidly in ephemeral swamps and pools.

Males call from wet ground near water, usually among sedges. Amplexus is axillary. Eggs are laid in shallow water, with the supplied field profile describing them as attached to the substrate of temporary waterbodies.

Breeding is concentrated in spring and summer after rain. Males may call during summer, autumn and late winter when wet weather occurs, so rainfall can extend the period when breeding activity is detected.

Breeding season: Spring and summer, usually following rain.

Egg-laying habitat: Shallow water in ephemeral swamps and pools.

Egg attachment: Attached to the substrate of temporary waterbodies, according to the supplied field profile.

Clutch size: Not stated in the supplied documents.

Gestation or incubation: Not stated in the supplied documents.

Age at maturity: Not stated in the supplied documents.

Lifespan: Not stated in the supplied documents.

Breeding habitat: Larval habitat

Tadpoles develop in shallow temporary water and complete metamorphosis in less than 60 days. They are mainly bottom-dwelling and feed on detritus, dead insects and worms.

Breeding habitat can be damaged without direct clearing of the pool. Water extraction, changed drainage, sediment, poor water quality, biocides and altered fire or weed regimes can affect the wetland and its surrounding sedges.

  • Retain shallow ephemeral pools, sedge margins and wet ground used by calling males.
  • Maintain the natural wetting and drying pattern of breeding pools.
  • Keep construction runoff, sediment and biocides out of acidic wallum wetlands.

Sheltering habitat: Ground refuges

The wallum rocket frog is terrestrial outside breeding activity and uses wet heath, sedges, wet ground and nearby eucalypt forest. The supplied documents do not describe specialised shelters or provide dimensions for refuge features.

Adults and non-breeding frogs may occur around sedge swamps, drainage lines, wet heath and eucalypt forest near breeding wetlands. Males call from wet ground among sedges.

The species has reduced toe pads and is a poor climber, so ground-level vegetation and moist substrate are more relevant than tree hollows or elevated roosts.

  • Retain sedge cover, low vegetation, moist leaf litter and damp ground around wetlands.
  • Inspect ground cover and wet heath during fauna searches, especially after rain.
  • Avoid assuming that dry-looking terrestrial habitat is unused when the nearby wetland is seasonally dry.

Sheltering habitat: Shelter information gaps

No den, burrow, hollow, nest, roost, refuge size, home range or shelter depth is provided in the supplied documents. There is also no reported information on tracks, scats, sloughs or eyeshine for this species.

For clearing projects, the practical protection unit is therefore the wetland, its sedge margin and the adjoining terrestrial wet heath or forest rather than a measured individual refuge.

Threats: Clearing, development and fragmentation

The main project risks are loss and fragmentation of wallum habitat, damage to temporary breeding pools, and changes to wetland hydrology and water quality. Risk is highest where clearing or construction overlaps wet heath, sedge swamps, drainage lines, perched lakes or adjoining terrestrial habitat.

Residential, resort, agricultural, forestry and pine plantation development have reduced or fragmented habitat. Sand mining has also caused habitat loss in wallum areas.

Clearing can remove both breeding wetlands and the terrestrial habitat used by adults away from water. Fragmentation can isolate populations that already have a highly fragmented distribution.

  • Map wet heath, sedge swamps, drainage lines, perched lakes, ephemeral pools and adjoining eucalypt forest before finalising the clearing footprint.
  • Avoid clearing wetland margins and retain links between wetland patches where practicable.
  • Treat unoccupied-looking dry pools as potential breeding habitat because breeding sites are ephemeral.

Threats: Hydrology and water quality

Water extraction, altered drainage and changed hydrological regimes can reduce or change breeding habitat. Development can also degrade water quality in wetlands.

Biocides may harm embryos and larvae in urban or peri-urban areas. Construction sediment and polluted runoff are relevant risks for shallow temporary pools.

  • Maintain the natural inflow, drainage and seasonal inundation pattern of wallum wetlands.
  • Prevent sediment, concrete washout, fuel, herbicide and other contaminants from entering pools, swamps and drainage lines.
  • Avoid diverting, draining or concentrating runoff into breeding pools.

Threats: Fire, weeds and disturbance

Inappropriate fire regimes and weed invasion can alter wet heath, sedge structure and wetland condition. Trampling of reed beds and wetland margins is a reported concern at popular coastal tourist sites.

Construction access, machinery and pedestrian movement can crush frogs, eggs, tadpoles, sedges and shallow pool margins.

  • Keep machinery, storage areas and access tracks out of wet heath, sedge beds and wetland margins.
  • Use hygiene and weed controls that do not introduce new weeds or contaminated water between wetlands.
  • Plan fire management to maintain the structure and hydrology of wallum heath and sedge habitat.

Threats: Disease, predators and competition

Chytrid fungus infection is identified as a potential concern. Frog pathogens can spread between wetlands through people, footwear, vehicles, equipment and water.

Mosquito fish, Gambusia holbrooki, may threaten populations in low-lying areas subject to inundation. Pigs may pose a threat at some sites. The striped rocket frog may compete with the wallum rocket frog in disturbed areas.

  • Apply the relevant Australian frog hygiene procedures when moving between wetlands or handling frogs.
  • Do not release fish, water or aquatic material into wallum pools.
  • Manage access and disturbance around wetlands to reduce trampling and avoid creating conditions that favour invasive species.

Survey methodology: 1. Nocturnal call and spotlight surveys

Survey the Wallum Rocket Frog, Litoria freycineti, in its coastal wallum habitat, with emphasis on temporary and perched wetlands, drainage lines, wet heath and nearby forest. The available species documents do not prescribe a standard survey effort, so the project ecologist should set effort to match the size and risk of the disturbance area and record the basis for that decision.

Survey during spring and summer, especially after rain, when the species breeds and males call. Males may also call in late winter, autumn and summer when wet weather prevails.

Search wet ground near water and among sedges around ephemeral swamps, shallow pools, perched lakes and drainage lines. Extend searches into nearby eucalypt forest because frogs may occur some distance from water.

Listen for the rapid series of drawn-out yaps and quacks, which may occasionally quaver, and use a torch to confirm frogs where safe access allows.

Record survey date, start and finish time, rainfall or recent rain, temperature if measured, wind, cloud, water condition, search area, observers and all detections. The source material does not provide a prescribed number of nights or hours, so report the actual effort rather than applying an unsupported fixed effort.

Adult male snout to vent length: 34 to 39 mm

Adult female snout to vent length: 39 to 42 mm

Breeding period: Spring and summer after rain, with calling also recorded in late winter and autumn during wet weather

Call: Rapid yapping or duck-like quacking, sometimes quavering

Survey methodology: 2. Wetland and habitat searches

Walk all accessible wet heath, sedge swamps, drainage lines, perched lakes, ephemeral pools and adjacent eucalypt forest within and beside the proposed disturbance area.

Search shallow water and the substrate around the waterbody because eggs are laid in shallow water and males call from wet ground near water among sedges.

Inspect areas with sandy soil or sandstone and acid, low-nutrient water. Note dense sedge cover, wet heath condition, water permanence, tannins, water quality, hydrological connections and evidence of disturbance.

Map each wetland, drainage line, calling station, egg or tadpole record and associated refuge area. Include habitat outside the clearing footprint where it may support frogs displaced by the works.

Habitat: Coastal wet heath, sedge swamps, drainage lines and perched lakes on sandy soil or sandstone

Non-breeding habitat: Nearby eucalypt forest and areas some distance from water

Egg placement: Shallow water in temporary waterbodies

Larval development: Rapid, with metamorphosis in less than 60 days

Survey methodology: 3. Day searches and aquatic checks

Use daytime habitat searches to locate frogs sheltering in wet heath, sedges and forest near breeding water. Treat the absence of calling frogs during daylight as inconclusive.

Where access and approvals allow, inspect shallow pools for eggs and tadpoles without disturbing the substrate or vegetation. Tadpoles are mainly bottom dwelling and feed on detritus, dead insects and worms.

Do not drain, fill, enter or alter a wetland to improve detection. Avoid trampling reed and sedge beds, which are identified as a threat at popular coastal sites.

Use aquatic eDNA, dip netting, trapping or other specialised methods only where approved by the relevant authority and justified in the survey design. The supplied documents do not provide species-specific effort or equipment requirements for these methods.

Tadpole maximum size: 53 mm

Tadpole habitat and behaviour: Mainly bottom dwelling in breeding water

Tadpole development: Metamorphosis in less than 60 days

Survey methodology: Minimum effort and reporting

  • Have a suitably qualified ecologist set and document the survey effort for the disturbance footprint, adjoining habitat and all wetlands that may be affected by changed drainage, water quality, fire or access.
  • Time the principal survey effort to spring and summer after rain, and add surveys after suitable wet weather where the works may affect breeding habitat.
  • Repeat surveys where initial conditions are unsuitable, including when wetlands are dry, access is unsafe, wind or rain prevents reliable listening, or the site has not received the wet conditions needed for calling.
  • Record negative results with the same detail as positive results, including searched habitat, area covered, observers, dates, times and conditions.
  • Submit confirmed records and survey data to the relevant Queensland or New South Wales wildlife database, or the relevant state or territory biodiversity database for the project location.
  • Report the species as Litoria freycineti, Wallum Rocket Frog, and retain photographs, call recordings, coordinates and specimen handling details where applicable.

Before habitat disturbance: Avoid and minimise habitat loss

Treat coastal wallum wetlands and adjoining wet heath as potential Wallum Rocket Frog habitat. The species has a fragmented distribution and has lost habitat to development, agriculture, pine plantations, sand mining and other disturbance, so avoid impacts before relying on relocation or rehabilitation.

  • Keep wet heath, sedge swamps, drainage lines, perched lakes, ephemeral pools and adjoining eucalypt forest outside the disturbance footprint wherever practicable.
  • Retain the hydrology of breeding wetlands, including the catchment and drainage pathways that maintain temporary pools and perched lakes.
  • Retain connected areas of wet heath and forest between breeding wetlands, because the species may occur away from water and the documents identify habitat fragmentation as a threat.
  • Keep machinery, stockpiles, access tracks, lighting, sediment, weeds and spoil out of wetlands, sedge beds and drainage lines.
  • Prevent changes to water quality, water levels and wetland hydroperiod caused by excavation, dewatering, stormwater discharge, water extraction or altered drainage.

Before habitat disturbance: Approvals and project planning

Queensland status in the supplied recovery plan: Vulnerable under the Queensland Nature Conservation Act 1992

National status in the supplied recovery plan: Not listed under the EPBC Act

Ramsar association: Wallum Rocket Frog is listed as a species contributing to the Moreton Bay Ramsar site's importance

  • Confirm the current state conservation status and obtain any required state permits before handling, trapping, relocating or interfering with Wallum Rocket Frogs or their habitat; the supplied sources identify the species as Vulnerable in Queensland.
  • Check whether the project may affect a nationally listed matter or a Ramsar wetland and obtain specialist advice on whether an EPBC Act referral is required; the supplied sources do not list Litoria freycineti as nationally listed, but the Moreton Bay Ramsar site identifies it as an internationally important wetland species.
  • Prepare a fauna management plan that maps breeding wetlands, wet heath, drainage lines, adjoining forest, exclusion areas, access routes, wet weather controls, fauna handling arrangements and stop-work triggers.
  • Stage clearing so that retained wetland and refuge habitat remains connected and available before each clearing stage begins.
  • Schedule the highest-risk wetland and wet heath works outside the spring and summer breeding period where practicable, and avoid works after rain when frogs are active and breeding is most likely.

Before habitat disturbance: Pre-clearance preparation

  • Complete a pre-clearance survey of all potential habitat and wetland areas before vegetation or ground disturbance starts.
  • Mark no-go areas, wetland edges, sedge beds, drainage lines, retained forest and approved access routes on plans and on the ground.
  • Install exclusion fencing where it can keep machinery and personnel out of retained wetlands and wet heath, and inspect the fencing after rain and earthworks.
  • Brief the fauna spotter catcher, supervisors and operators on the frog's appearance, call, habitat, handling limits, wetland controls and stop-work procedure.
  • Confirm the destination habitat for any authorised relocation before clearing starts, using nearby retained habitat with suitable wet heath, sedges, shallow water and shelter.

During habitat disturbance: Daily controls and machinery interface

Use a fauna spotter catcher who can direct machinery around wetlands and stop work when frogs or breeding habitat are at risk. Ground disturbance, altered drainage, trampling and poor water quality can affect the species even when no frog is seen.

  • Inspect exclusion fencing, wetland boundaries, sediment controls and access routes before work starts each day and after substantial rain.
  • Keep machinery within approved work areas and prevent entry into sedge beds, wet heath, shallow pools, drainage lines and perched lakes.
  • Use the spotter catcher to inspect the immediate work area before each clearing or excavation activity and to maintain visual control of the active edge where practicable.
  • Stop or relocate machinery when a frog, egg mass, tadpole, wetland or unmarked refuge is found, until the spotter catcher has assessed the risk.
  • Prevent sediment, concrete washout, fuel, chemicals, herbicides and other contaminants from entering breeding water; biocides are identified as a threat to embryos and larvae.

During habitat disturbance: Wetland and habitat feature handling

  • Do not fill, drain, pump, divert or alter a wetland, drainage line or perched lake unless the approved environmental controls specifically allow it and the relevant approvals are in place.
  • Avoid trampling reed and sedge beds and keep workers and machinery on defined routes.
  • Retain wet heath vegetation, shallow pools, wet ground and adjoining forest wherever possible; these are more relevant refuge and breeding features for this species than hollow-bearing trees or terrestrial rock features.
  • If a wetland must be isolated, maintain water quality and suitable hydrology and obtain approval for any pumping, drawdown or water transfer before starting.
  • Treat logs, rocks, leaf litter and dense ground vegetation as potential shelter where they occur beside wet heath or wetlands, and move them only when authorised and under the fauna management plan.

During habitat disturbance: Animal encounters, stop work and records

  • Do not allow untrained workers to catch, handle or move a Wallum Rocket Frog.
  • When a frog is found, stop the relevant activity, keep people and machinery clear, photograph it where this can be done without disturbance, and notify the fauna spotter catcher and environmental officer.
  • Have the authorised fauna spotter catcher determine whether the frog can remain in place or must be relocated to nearby retained habitat with suitable wet heath, sedges and water.
  • Use clean, disinfected equipment and follow the approved frog hygiene procedure when handling frogs or moving between wetlands, because chytrid fungus is identified as a serious frog disease risk in the supplied guidance.
  • Send injured frogs to a veterinarian or authorised wildlife carer through the project fauna procedure, and do not release them without advice from the authorised person.
  • Stop work and escalate to the environmental officer if a frog is found in the active work area, eggs or tadpoles are detected, a wetland boundary or drainage pathway is damaged, sediment enters breeding water, or the approved controls cannot be maintained.
  • Record every detection, handling event, relocation, injury, mortality, stop-work event, wetland impact, corrective action, date, time, location and personnel involved.

After habitat disturbance: Post-clearance inspection

Post-clearance work must confirm that no frogs or breeding stages remain at risk and that retained wetlands continue to function. Monitor both direct impacts and indirect effects such as altered water quality, weeds, fire and changed hydrology.

  • Inspect the cleared edge, wetland margins, drainage lines, sediment controls and retained wet heath immediately after each clearing stage and after substantial rain.
  • Search retained habitat for frogs, calling males, eggs and tadpoles during suitable spring and summer wet weather, using the same methods and effort recorded before disturbance.
  • Check that no spoil, mulch, sediment, rubbish, machinery or access tracks have entered retained wetlands, sedge beds or drainage lines.
  • Repair exclusion fencing, erosion controls, wetland edges and drainage controls before the next work stage if they have failed.

After habitat disturbance: Monitoring and reporting

  • Monitor retained and rehabilitated wetlands for water presence, water quality, vegetation condition, weeds, fire effects, mosquito fish and evidence of frog breeding.
  • Compare post-work detections with the pre-clearance baseline, while recognising that the recovery plan reports no regular monitoring of Wallum Rocket Frog numbers at most sites.
  • Report all frog records, mortalities, injuries, relocations, breeding observations, wetland impacts, control failures and corrective actions to the project environmental officer and relevant regulator.
  • Submit validated occurrence records to the relevant state or territory biodiversity database and retain coordinates, photographs, call recordings and survey effort with the project records.

After habitat disturbance: Controls and offsets

  • Maintain no-go areas, exclusion fencing, sediment controls, wetland buffers and hydrological controls until the environmental officer confirms that the site is stable and the approved controls are no longer needed.
  • Apply any approved offset, conservation agreement or habitat protection measure required by the project approval, particularly where residual loss of wallum wetland or wet heath habitat remains.
  • Do not treat an offset as a substitute for avoiding wetland clearing, fragmentation, trampling or changed hydrology at the work site.

Rehabilitation actions: Restore wetlands and wet heath

Rehabilitation should recreate the low-nutrient, acidic wetland and wet heath conditions used by the species, while protecting nearby retained habitat. The goal is functional breeding and refuge habitat, not simply revegetation of disturbed ground.

  • Reinstate ephemeral swamps, shallow pools, drainage lines and perched wetland features where they have been approved for rehabilitation and where the original hydrology can be restored.
  • Use local wallum wet heath and sedge species identified by a qualified restoration ecologist, and source plant material appropriate to the local coastal sandplain or sandstone setting.
  • Restore shallow margins and wet ground where males can call among sedges and where eggs can be attached in shallow water.
  • Avoid creating permanent, nutrient-rich ponds that differ from the species' low-nutrient, acidic wetland habitat.
  • Keep rehabilitation areas connected to retained wet heath, drainage lines, perched lakes and nearby eucalypt forest.

Rehabilitation actions: Manage threats and habitat condition

  • Control weeds before they dominate wet heath, sedge beds or drainage lines, using methods that prevent herbicides and other biocides entering breeding water.
  • Prevent mosquito fish, Gambusia holbrooki, from entering or being introduced to low-lying wetlands where they may threaten frog populations.
  • Manage fire with a site-specific ecological fire plan that avoids inappropriate fire regimes and protects wetland refuges; the supplied species documents identify inappropriate fire as a threat but do not prescribe a fire interval.
  • Control trampling, vehicle access, sand disturbance, pigs and other site-specific pressures identified during monitoring.
  • Use frog hygiene procedures for staff, vehicles, boots, nets and other equipment moving between wetlands to reduce pathogen spread.

Rehabilitation actions: Reinstate shelter and verify success

Breeding evidence for monitoring: Calling males, eggs in shallow water, tadpoles and metamorphs

Larval benchmark: Metamorphosis can occur in less than 60 days

Habitat benchmark: Coastal wet heath with sedge swamps, drainage lines or perched lakes, plus nearby forest refuge

  • Retain or reinstate natural ground cover, sedges, leaf litter, logs and rocks beside wet heath and wetlands where they occur in the local habitat.
  • Do not install nest boxes as a default measure because the Wallum Rocket Frog is terrestrial and the supplied documents do not identify tree hollows or nest boxes as limiting resources for this species.
  • Monitor rehabilitation after rainfall in spring and summer for calling males, adults, eggs, tadpoles and metamorphs, and inspect the habitat during other wet periods when calling may occur.
  • Use the original habitat condition, wetland hydrology, water quality, weed cover, connectivity and confirmed frog breeding as success measures.
  • Continue corrective works if wetlands dry through altered drainage, water quality declines, weeds spread, mosquito fish appear, or the species is absent despite suitable survey conditions.

Sources