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Arnhem Tomb Bat (Taphozous kapalgensis)

The Arnhem sheath-tailed bat (Taphozous kapalgensis) is a small insectivorous microbat of northern Australia, recorded mainly in the Top End of the Northern Territory. It is listed as Near Threatened in the Northern Territory and has been detected on development and mining sites in woodland, creekline and dam-side habitats, so tree clearing, roost disturbance and changes to water availability require assessment.

Conservation status

Northern Territory, Territory Parks and Wildlife Conservation Act 1976: Near threatened.

Breeding season

This seasonal profile follows the wet and dry season pattern described for the Top End. Exact breeding dates, movements and periods of torpor are not established in the supplied documents.

Months are January to December. A value of 2 indicates the period is expected to be most relevant, 1 indicates that it can occur, and 0 indicates that it is not typical or is not documented.

  • Breeding: Breeding and births are reported during the wet season, generally November to April, with one pup per female. The strongest period is not precisely defined, so January to April is shown as the likely peak activity period rather than a confirmed peak breeding period.
  • Young: Females give birth to a single pup during the wet season and lactating females make frequent foraging trips. The duration of dependence is not provided.
  • Highest clearing risk: Clearing or roost disturbance is most likely to harm the species during the wet season, when breeding, births, dependent young and frequent lactation trips are reported. March to May may also have high detection activity, but no confirmed seasonal clearing window is published.

Identification

The Arnhem sheath-tailed bat is a small sheath-tailed bat of the Top End. Identification during project surveys will usually depend on recorded echolocation calls supported by habitat and, where required, capture-based confirmation.

Adults have a forearm length of roughly 40 to 45 mm and weigh only a few grams. The species belongs to Emballonuridae, the family that includes sheath-tailed or sac-winged bats. Members of this family have a glandular pouch on each wing.

Forearm length: Approximately 40 to 45 mm.

Adult weight: A few grams.

Identification: Calls and similar species

Echolocation calls are reported to centre around 45 to 55 kHz, but frequency alone should not be treated as definitive. Several Top End microbats have overlapping calls, and the supplied survey report states that some species can only be separated by trapping and examination of reference calls. Use full call recordings, regional reference material and an experienced bat call analyst.

Reported call frequency: Approximately 45 to 55 kHz.

Preferred detection approach: Non-invasive acoustic detection, with supporting evidence and capture only where necessary.

  • Record calls for later analysis rather than relying only on a heterodyne detector reading.
  • Treat an identification as provisional where call structure, recording quality or regional reference material is inadequate.
  • Use capture only where required, under the relevant permits, animal ethics approvals and landholder permissions.

Identification: Field signs and survey limitations

The main field sign is a recorded echolocation call. The supplied documents do not provide diagnostic information on tracks, scats, nests, eyeshine or other ground signs. Potential daytime roosts include hollow trees, rock crevices and old buildings or roofing, but a visual inspection should be carried out from a distance where possible.

  • Do not rely on a single call file or a single detector night for a high-consequence clearing decision.
  • Do not enter or repeatedly inspect a suspected roost without a specific method and disturbance assessment.
  • Do not use trip lines, shooting or hand-netting as routine methods. The Australian Government guidelines favour non-invasive detection and warn that these methods can stress or injure bats.

Distribution: National range

The supplied records place the Arnhem sheath-tailed bat in northern Australia, particularly the Top End of the Northern Territory. The available material does not provide a confirmed population estimate, trend estimate or a detailed list of Australian bioregions.

The documented range is concentrated in the Arnhem Land region and adjacent savanna woodlands in the Northern Territory. The supplied sources do not identify confirmed records from another Australian state or territory.

State or territory documented in the supplied material: Northern Territory.

Broad Australian range: Top End, especially Arnhem Land and adjacent areas.

  • For project assessments, check the Northern Territory Fauna Atlas and current government databases for records near the site.
  • Do not treat the absence of an atlas record as evidence that the species is absent, because the species can be difficult to identify from calls and may be poorly detected.

Distribution: Known records and local occurrence

The species has been recorded in coastal environments, floodplains, mangroves, patchy monsoon forest, adjacent woodland and areas near sandstone escarpments. At the Toms Gully and Rustlers Roost project areas, it was recorded at four sites, including woodland on slopes beside Annie's Dam, lowland woodland and a major creekline.

Sites recorded in the cited survey: Four sites: ST1, ST2, ST4 and SR1.

Closest cited NT Fauna Atlas record to Toms Gully: 55 km north-east of the Toms Gully survey area.

  • The Toms Gully survey recorded the species at ST1, ST2 and ST4, and the Rustlers Roost survey recorded it at SR1.
  • The closest NT Fauna Atlas record cited for the Toms Gully area was 55 km north-east, near a tributary of the West Alligator River.
  • Multiple records within one project area should be treated as evidence of local use, not as evidence of abundance.

Distribution: Population and trend

The supplied documents do not provide a national population estimate, generation length or quantitative population trend. The cited project report considered the species likely to be locally common and resident in its survey areas, but acoustic detections do not provide abundance data.

National population estimate: Not provided in the supplied documents.

Quantitative population trend: Not provided in the supplied documents.

Acoustic abundance: The cited report states that Anabat detections do not provide abundance data.

  • Do not convert detector files or bat passes into population size.
  • Report the number of detector nights, call files, confirmed locations and identification confidence separately.

Habitat: Habitat types

The Arnhem sheath-tailed bat uses a range of Top End habitats, particularly woodland associated with water and coastal or floodplain environments. The supplied sources provide habitat types and roost features, but no elevation limits or measured vegetation densities.

Recorded or reported habitats include open woodland, savanna woodland, paperbark swamps, monsoon vine thickets, floodplains, mangroves, patchy monsoon forest, creeklines and areas beside dams or other water bodies. The species has also been recorded near sandstone escarpments.

  • Map and retain woodland adjoining creeks, dams, billabongs, floodplains and other insect-rich wet areas.
  • Assess the connections between woodland, water and potential roost trees rather than assessing isolated trees only.
  • Include disturbed structures such as old sheds and corrugated roofing in the roost assessment.

Habitat: Structural features

Potentially suitable habitat includes hollow eucalypts, trees with loose or peeling bark, rock crevices, old termite mounds with hollow chambers and man-made structures. The supplied documents do not give a minimum hollow diameter, tree diameter, canopy density or elevation threshold.

  • Record hollow-bearing trees, loose bark, rock fissures, termite mounds, sheds and roofing within and adjacent to the disturbance footprint.
  • Record nearby water, creekline position, floodplain setting and woodland condition.
  • Protect roost features and the surrounding flight and foraging area until their use has been assessed.

Habitat: Climate and site conditions

The species occurs in the tropical Top End. Activity is associated with warm, humid conditions and increased insect availability during the wet season, while heavy rain, strong winds and cooler conditions can suppress emergence.

  • Schedule acoustic work for suitable nights and record rain, wind, temperature and humidity with each survey.
  • Avoid interpreting a negative result from heavy rain or otherwise poor flight conditions as proof of absence.

Foraging habitat: Diet

The Arnhem sheath-tailed bat is an insectivorous, aerial-foraging microbat. It feeds on flying insects around woodland, wet areas and the edges of monsoon vegetation.

Reported prey includes moths, beetles and other aerial insects. No specific food plants are identified in the supplied documents. The species is therefore likely to respond to areas that support abundant flying insects rather than to particular plant species alone.

Diet: Moths, beetles and other flying insects.

  • Retain insect-producing wet areas, creeklines, paperbark swamps and woodland edges where practicable.
  • Assess night lighting because artificial light can alter insect movements and bat foraging behaviour, although the supplied documents do not quantify its effect on this species.

Foraging habitat: Foraging locations and behaviour

Foraging is reported around open woodland, paperbark swamps, monsoon vine thickets and water bodies such as billabongs, creeks and floodplains. Emergence usually begins 15 to 30 minutes after sunset, with peak activity lasting about an hour in favourable conditions.

Typical emergence timing: About 15 to 30 minutes after sunset.

Reported peak activity period: Roughly one hour after emergence in favourable conditions.

Foraging range: No measured foraging range is provided in the supplied documents.

  • Place detectors at water edges, creeklines, woodland edges and near potential roost trees, while avoiding direct disturbance of roost entrances.
  • Survey through the night where possible because a short observation period may miss later activity.
  • Record weather and water conditions so that activity results can be interpreted consistently.

Breeding habitat: Breeding biology

The supplied information indicates wet-season breeding, with females giving birth to one pup. Detailed reproductive measurements are not provided, so project decisions should rely on observed roost use and current advice rather than assumed dates or tolerances.

Breeding activity is reported during the wet season, when insect abundance increases. Females give birth to a single pup and lactating females make frequent foraging trips. The supplied documents do not provide confirmed dates for mating, gestation, weaning or sexual maturity.

Breeding season: Wet season, generally November to April in the supplied account.

Litter size: One pup.

Gestation: Not provided in the supplied documents.

Age at maturity: Not provided in the supplied documents.

Lifespan: Not provided in the supplied documents.

  • Treat occupied roosts as sensitive during the wet season, particularly where females are likely to be lactating or young are dependent.
  • Avoid clearing or disturbing a confirmed roost until a qualified ecologist has assessed the risk and any required approvals or controls.

Breeding habitat: Breeding habitat features

Breeding habitat is likely to depend on secure roost cavities or crevices close to woodland and productive wet areas. Potential features include hollow trees, rock crevices, old termite mounds and buildings or roofing that provide shelter.

  • Retain hollow-bearing trees and other potential roost structures near water and woodland edges.
  • Inspect structures proposed for removal before works, using non-invasive methods first.
  • Maintain quiet access and avoid blocking entrances to occupied roosts.

Sheltering habitat: Natural roosts

Potential sheltering sites include tree hollows, rock crevices, termite-mound chambers and some human structures. The supplied material does not identify confirmed colony sizes, roost dimensions or a standard disturbance buffer.

Reported natural shelter includes hollow trees, trees with loose or peeling bark, rock crevices and hollow chambers in old termite mounds. The species has been recorded in woodland, creekline and dam-side settings where these features may occur.

  • Retain hollow trees and trees with loose bark within the clearing footprint and along access tracks until their use has been checked.
  • Inspect termite mounds and rock crevices that could be connected to woodland or water.
  • Do not fill, seal, prune or burn a potential roost feature without an approved method.

Sheltering habitat: Artificial roosts

The species may roost in old sheds, under corrugated roofing and in other man-made structures. Structures should be checked before demolition, refurbishment or roofing works.

  • Schedule inspections in daylight and avoid shining bright lights directly into entrances.
  • If bats are present, stop work around the structure and obtain advice from a suitably qualified ecologist or wildlife authority.
  • Use non-invasive acoustic and visual methods before considering capture.

Sheltering habitat: Disturbance controls

The supplied bat survey guidelines emphasise non-invasive detection and minimising disturbance. Hand-netting active bats in flight can damage wings, and pursuit within a non-torpid roost can cause bats to abandon it.

  • Keep personnel, vehicles and machinery away from confirmed roost entrances where practicable.
  • Do not block an entrance or remove surrounding vegetation without assessing the effect on access and flight.
  • Use permits, animal ethics approvals and landholder permissions for any capture or handling.

Threats: Clearing and habitat loss

For projects, the main risks are loss or disturbance of roost features, clearing of woodland and wet habitats, and disruption of the connection between roosts, water and feeding areas. The supplied documents do not provide species-specific evidence for every threat listed below, so controls should be based on site records and current approvals advice.

Clearing hollow-bearing trees, woodland, creekline vegetation, paperbark swamp, monsoon vegetation or floodplain habitat can remove roosts and feeding areas. The species has been recorded in both woodland and creekline settings within surveyed project areas.

  • Avoid clearing hollow-bearing trees and potential roost structures where practicable.
  • Use pre-clearance inspections and fauna spotter catcher controls for trees, sheds, roofing, rock crevices and termite mounds.
  • Retain connected woodland near dams, creeks, floodplains and other likely foraging areas.

Threats: Roost disturbance

Bright lights, loud noise, repeated entry and demolition can disturb bats using tree hollows, crevices or buildings. The supplied survey guidelines warn that pursuit within roosts can lead to abandonment in many bat species.

  • Approach suspected roosts quietly and use red-filtered light where night inspection is necessary.
  • Do not enter or repeatedly inspect an occupied roost without a disturbance plan.
  • Stop work and escalate if bats are injured, grounded or found in a structure scheduled for removal.

Threats: Water, fire and other project pressures

The species is associated with dams, creeks, billabongs, floodplains and other wet areas, and insect activity is linked to wet-season conditions. Changes to drainage, water availability or wetland vegetation may reduce feeding opportunities. Fire can remove hollow trees, loose bark and vegetation, but the supplied documents do not quantify this species' fire response.

  • Prevent sediment, pollutants and uncontrolled drainage from affecting nearby dams, creeks and floodplain habitats.
  • Protect wetland and riparian vegetation during construction and rehabilitation.
  • Assess planned burns and wildfire exposure around hollow trees and known roosts.

Threats: Roads, predators and disease

The supplied documents do not provide species-specific rates for vehicle collisions, predation or disease. Roads and construction activity can still create local risks around roosts, water points and night-working areas, so these risks should be checked during the site assessment.

  • Limit night vehicle speeds near known roosts, water points and detector locations.
  • Do not handle bats unless authorised and trained, and follow current Australian bat handling and biosecurity guidance.
  • Record any injured or dead bat and refer it to the relevant wildlife authority or qualified fauna ecologist.

Survey methodology: 1. Acoustic detection

Use non-invasive acoustic detection as the primary method, supported by habitat inspection and targeted capture only where authorised and needed to resolve identification. The available records show the species can be detected by Anabat recordings, but call identification in the Top End is difficult and should be interpreted by an experienced analyst.

Deploy ultrasonic detectors through the full period of nightly bat activity, rather than relying on a short dusk observation period.

Use full-spectrum or time-expansion recording where available, retain the original files and document detector settings, microphone type, placement and weather conditions.

The survey guideline identifies electronic detection as non-invasive and useful for species that are not readily captured. The Arnhem sheath-tailed bat was recorded with an Anabat detector in the Top End.

Treat call identification as a presence indication, not an abundance estimate. Detector files are affected by microphone sensitivity, call loudness, temperature, humidity and the number of times an individual passes the detector.

Use a regional reference library and an experienced analyst. The project report states that Arnhem sheath-tailed bat calls were not well recorded, but the analyst was confident the species was present at the sites identified.

Reported call frequency range: 45 to 55 kHz, as reported in the supplied field guide.

Example project acoustic effort: More than 15,000 bat files were recorded during the November 2016 survey, and more than 18,000 files during the May 2017 survey.

  • Place detectors near likely flight paths, creeklines, dams, floodplain margins, woodland edges and retained roost habitat.
  • Record the exact detector location, start and finish times, equipment and file numbers for every deployment.
  • Do not report the number of detector files as the number of bats or as an abundance estimate.

Survey methodology: 2. Capture and confirmation

Use trapping only under the relevant wildlife and animal ethics approvals, and only where acoustic or visual evidence requires confirmation.

Use an approved bat trapping method selected by the licensed ecologist, such as mist nets or harp traps where suitable for the flight path and habitat. The supplied material does not provide species-specific trap dimensions, trap density, trap nights or a capture schedule for this species.

Do not use a hand net to catch bats in flight. Hand-netting can damage wings, and pursuing non-torpid bats in a roost can cause roost abandonment.

Do not use trip lines as a first-choice method. The survey guideline states that they can stress bats and should only be considered after less invasive methods have been attempted and shown to be ineffective.

If capture is required, ensure that a trained and authorised person handles the animal, records the identification and releases it promptly at the capture location or another approved nearby retained site.

  • Design the capture layout around known flight paths and avoid placing equipment across roost entrances.
  • Stop capture if bats show repeated collision, entanglement, abnormal behaviour, injury or excessive stress.
  • Arrange veterinary or wildlife carer support before trapping begins.

Survey methodology: 3. Roost, habitat and emergence checks

Inspect likely habitat during daylight without entering or disturbing suspected roosts unless the inspection is authorised and necessary.

Search woodland, lowland woodland, creekline and wetland-edge habitat, including hollow trees, loose bark, rock crevices, structures and areas near dams or other water.

Use dusk emergence observations with acoustic recording at retained hollow trees, creeklines, dams and other likely flight paths. The supplied material does not establish a species-specific emergence duration or a fixed observation radius.

The project survey recorded the species in woodland on slope habitat beside Annie's Dam, lowland woodland and a major creekline. These records support checking both terrestrial habitat and water-associated flight paths.

Example recorded habitats: Woodland on slope beside Annie's Dam, lowland woodland and a major creekline.

  • Arrive before sunset, keep away from likely roost entrances and use red-filtered light if lighting is needed.
  • Do not shine bright lights into a roost entrance, block an entrance or make repeated approaches to an occupied tree or structure.
  • Record the feature type, location, evidence of occupancy, photographs taken from a distance and any proposed disturbance footprint.

Survey methodology: 4. Timing, conditions and interpretation

Plan repeated surveys across contrasting conditions where the project risk warrants it. The supplied project used November and May surveys, and recorded the species in both survey periods.

The supplied field guide describes March to May as the most reliable observation period, with emergence usually 15 to 30 minutes after sunset, but these details should be treated as field guidance rather than a statutory survey standard.

Avoid interpreting heavy rain, strong wind or cool conditions as evidence that the species is absent, because these conditions can suppress or delay bat activity.

Use repeated detector nights and multiple habitat types where a single negative night could be caused by weather, equipment failure or low activity.

  • Check the weather forecast and record rain, wind, temperature and moon or light conditions for every survey night.
  • Repeat surveys if equipment failed, recording was poor, heavy rain suppressed activity or the result would affect a clearing decision.
  • Have an experienced analyst review ambiguous files, because the project report states that several Top End species have overlapping calls and that trapping may be needed to resolve identification.

Survey methodology: Minimum effort and reporting

  • Prepare a species-specific survey plan before fieldwork that states the number and location of detector nights, the habitat areas covered, the proposed capture method and the decision rule for additional survey.
  • Use non-invasive acoustic detection as the minimum method where suitable habitat may be disturbed, and add emergence, roost and capture work when acoustic identification is ambiguous or the impact risk is high.
  • Record every detector deployment, failed deployment, weather condition, call identification, roost inspection, capture, injury, release and mortality.
  • Map all records and likely roost or habitat features against the clearing footprint, access tracks, infrastructure and retained habitat.
  • Have a suitably experienced ecologist review all Arnhem sheath-tailed bat records and retain the original acoustic files and analysis output.
  • Submit confirmed records, including negative survey results where required by the approval, to the relevant Northern Territory or other state and territory wildlife database.
  • Check the current state or territory survey guideline, permit conditions and project approval before relying on this profile, because the supplied material does not provide a nationally prescribed effort standard for this species.

Before habitat disturbance: Avoid and minimise

Treat any confirmed record or suitable habitat as a planning constraint before clearing, construction or infrastructure work. The species is listed as Near Threatened in the Northern Territory and has been recorded in woodland, creekline and water-associated habitat.

Redesign the disturbance footprint to retain occupied or likely roost trees, creeklines, woodland beside dams, floodplain margins and connected flight paths wherever practicable.

Retain hollow-bearing trees, loose-barked trees, large fallen timber, rock features and older structures that may provide shelter until an ecologist has assessed them.

Keep water bodies, creeklines and their adjoining woodland connected to retained habitat. The supplied documents do not specify a numerical buffer, so set buffers through the project ecologist, risk assessment and approval conditions.

Avoid removing habitat that links known records at separate sites, particularly where acoustic records occur around the same wetland, dam or creek system.

Northern Territory status: Near Threatened.

EPBC Act status supplied: Not listed.

  • Place exclusion zones around confirmed roosts and high-risk habitat before machinery enters the site.
  • Use the smallest practicable clearing area and locate stockpiles, laydown areas, lighting and access tracks outside retained habitat.
  • Do not use bright permanent lighting that points towards roost trees, creeklines or retained woodland.

Before habitat disturbance: Approvals and permits

Confirm the current EPBC Act listing before works commence. The supplied species information states that the species is not listed under the EPBC Act, so an EPBC referral is not indicated solely for this species on that information, but other listed matters may still require referral.

Obtain the relevant state or territory wildlife approvals before capturing, handling, translocating or retaining voucher material.

Check whether an animal ethics approval, scientific permit, landholder consent, Aboriginal land access approval or firearm approval is required for the proposed survey or management action.

Include the species in the project's approval documents, fauna management plan, clearing permit and unexpected fauna procedure where suitable habitat occurs.

  • Confirm the approval pathway with the relevant wildlife authority before any trapping or handling.
  • Obtain permission from the relevant Aboriginal land council before surveys on Aboriginal land.
  • Nominate the authorised ecologist, fauna spotter catcher, wildlife carer and veterinary contact in the project fauna management plan.

Before habitat disturbance: Plan the works

Use the survey results to stage clearing so that high-risk habitat is dealt with by an experienced ecologist before lower-risk vegetation is removed.

Schedule works to avoid periods of high roost occupancy or reduced ability to detect animals where the site-specific assessment identifies such a risk. The supplied field guide reports March to May as a productive observation period, but it does not establish a statutory clearing season.

Plan daily pre-start checks, machine exclusion zones, night lighting controls, stop-work triggers, animal handling arrangements and release locations before mobilisation.

Include contingency time for additional acoustic monitoring, trapping or veterinary assessment if an animal is found.

  • Sequence clearing from previously disturbed areas towards retained habitat so mobile fauna can move away from machinery.
  • Keep machinery, spoil, fuel, waste and workers out of retained roost and flight-path areas.
  • Brief all workers on the species' appearance, likely habitat, stop-work procedure and prohibition on unauthorised handling.

Before habitat disturbance: Prepare the site

Complete a pre-clearance inspection of the approved footprint and adjacent retained habitat shortly before clearing.

Mark hollow-bearing trees, suspected roost trees, creeklines, wetland edges, dams, rock features and other habitat features that must be retained or inspected before removal.

Install exclusion fencing where it can protect a retained feature without blocking bat flight paths or access to water.

Check buildings, sheds, corrugated roofing and other structures for roosting bats before demolition or modification.

  • Use signs and GPS mapping to make exclusion zones visible to operators and supervisors.
  • Do not seal, block or alter a potential roost entrance before an authorised ecologist has assessed it.
  • Inspect the work area again after unexpected delays, storms or changes to the approved footprint.

During habitat disturbance: Daily controls and machinery interface

Use active supervision during clearing and construction. The fauna spotter catcher must be able to stop machinery, inspect habitat features and arrange authorised handling without pressure to continue work.

Complete a daily fauna and habitat check before machinery starts, including hollow trees, structures, creeklines, dams, logs, rocks and any feature marked for retention.

Keep the fauna spotter catcher in direct communication with the operator and supervisor, with authority to stop work immediately when an animal or high-risk feature is found.

Clear in small, supervised stages and keep machinery outside the current inspection area until the spotter catcher has released it for work.

Use low lighting at night and direct temporary lighting away from retained trees, water edges and suspected roosts.

  • Stop the machine before the spotter catcher approaches a tree, structure, log, rock pile or other feature.
  • Maintain the approved exclusion zones and do not move fencing, signs or habitat markers without ecologist approval.
  • Record the machine, work area, time, weather, inspection result and any fauna interaction in the daily environmental record.

During habitat disturbance: Habitat feature handling

Do not fell a hollow-bearing or suspected roost tree until it has been inspected and cleared by the authorised ecologist.

Inspect structures, loose bark, rock crevices, logs and dense debris before removal, using non-invasive methods where possible.

Avoid disturbing creeklines, dams, wetland margins and adjacent woodland beyond the approved footprint.

If a tree or structure must be removed, use the approved staged method in the fauna management plan and have the spotter catcher present for the whole operation.

  • Do not move a log, rock, hollow or other shelter feature into retained habitat unless the relocation method has been approved by the ecologist.
  • Do not block a flight path, roost entrance or access route to water with spoil, fencing, equipment or waste.
  • Stop work if an occupied roost, injured bat or group of bats is found in a feature scheduled for removal.

During habitat disturbance: If a bat is found

Stop work and protect the animal from machinery, people, heat, rain and predators.

Do not handle the bat unless you are trained, authorised and using the approved equipment and method.

Allow a healthy, mobile bat to leave under the direction of the authorised ecologist, or relocate it only to nearby retained habitat when that action is permitted and assessed as suitable.

Place an injured, grounded or unresponsive bat in a secure, ventilated container only if the authorised person can do so safely, and arrange prompt assessment by a veterinarian or licensed wildlife carer.

Do not attempt to catch a flying bat with a hand net, and do not pursue bats inside a non-torpid roost.

  • Keep workers and machinery away until the authorised person has completed the assessment.
  • Record the species identification or identification uncertainty, location, condition, action taken, release location and people involved.
  • Notify the project environmental officer and relevant authority where the approval or permit requires notification.
  • Escalate an ambiguous acoustic or physical identification to a senior ecologist before work resumes.

During habitat disturbance: Stop-work triggers and records

Stop work when a bat is found in the clearing footprint, an occupied roost is identified, a marked habitat feature is damaged, an animal is injured or the fauna spotter catcher cannot safely inspect the next work area.

Stop work when weather, dust, noise, lighting or access conditions prevent effective fauna supervision.

Resume only after the authorised ecologist has completed the inspection, applied the approved control and recorded the release or management decision.

  • Maintain a daily fauna register, habitat-feature register, incident register, photographs, GPS points and acoustic files.
  • Record all near misses, damaged exclusion fencing, unplanned vegetation removal and changes to the approved footprint.
  • Report any mortality, injury, roost disturbance or unauthorised handling through the project's incident and approval reporting systems.

After habitat disturbance: Post-clearance checks

Post-clearance work must confirm that retained habitat remains usable and that controls have not failed. Monitoring should focus on known records, retained roost features, water-associated flight paths and the edges of the cleared area.

Inspect the cleared area and retained habitat after each clearing stage for grounded, injured or trapped bats and for damage to marked habitat features.

Check that hollow trees, suspected roost structures, creeklines, dams, wetland margins, logs and rocks identified for retention remain intact.

Remove temporary hazards such as open trenches, uncovered pits, loose netting and unsecured pipes that could trap fauna.

Confirm that lighting, fencing, spoil and access tracks have not blocked retained habitat or bat flight paths.

  • Complete a final fauna inspection before demobilising the fauna spotter catcher.
  • Repair or replace damaged exclusion fencing and habitat markers promptly.
  • Record all post-clearance findings and unresolved risks in the environmental inspection register.

After habitat disturbance: Monitoring and reporting

Repeat acoustic monitoring at retained habitat where the project approval, risk assessment or pre-clearing results require it.

Use the same detector locations and documented settings where practical so that changes in detection can be interpreted against the pre-clearing record.

Do not infer population decline or recovery from detector file counts alone. The supplied project report states that Anabat data do not provide abundance data.

Report confirmed records, injuries, mortalities, roost disturbance, control failures and monitoring results to the project environmental officer and relevant authority as required.

  • Compare post-work records with the pre-work habitat map and retain the original recordings for audit.
  • Submit required species records to the relevant state or territory wildlife database.
  • Document whether the project met each fauna management plan commitment and list corrective actions for any failure.

After habitat disturbance: Maintain controls and offsets

Maintain retained habitat, exclusion zones, roost protection measures, lighting controls and erosion controls for the period specified in the approval or fauna management plan.

Manage new access tracks, stockpiles, weeds, feral animals and altered drainage so that retained woodland, creeklines and water-associated habitat remain suitable.

Apply any offset, restoration or compensatory habitat measure required by the approval. The supplied documents do not prescribe an offset ratio or offset method for this species.

  • Do not remove retained hollow trees or alter retained water bodies during later project stages without a new ecological assessment.
  • Review controls after extreme weather, fire, flooding, construction changes or complaints about wildlife impacts.
  • Close out the project only after monitoring, incident reporting and required database submissions are complete.

Rehabilitation actions: Restore habitat structure

Rehabilitation should restore the habitat features and flight routes used by the Arnhem sheath-tailed bat, with priority given to retained woodland, creeklines, wetlands and water-associated foraging areas. The supplied documents do not provide a species-specific planting list, nest-box design or rehabilitation target, so design these measures with a Northern Territory or relevant regional ecologist.

Replant cleared edges and disturbed areas with locally appropriate native woodland and wetland species that match the pre-disturbance vegetation community.

Restore continuous vegetation along creeklines, wetland margins and the edges of dams where this is consistent with the site's pre-disturbance condition.

Retain standing hollow-bearing trees wherever safe, and allow replacement trees to mature as part of the long-term habitat plan.

Reinstate suitable logs, rocks and other retained habitat features where they were removed for construction and the approved rehabilitation method allows it.

  • Use local provenance plants where required by the rehabilitation plan or approval.
  • Protect new plantings from grazing, fire, weeds, vehicles and erosion.
  • Do not install nest boxes or artificial roosts as a substitute for retaining natural hollows unless the ecologist has shown that they are suitable and the design is approved.

Rehabilitation actions: Restore water and control threats

Re-establish natural drainage and stable water edges around dams, creeklines and wetland areas affected by works.

Prevent sediment, pollutants and excess lighting from entering or degrading retained water-associated habitat.

Control weeds and introduced predators in rehabilitation areas where they reduce shelter, roost access or insect prey.

Manage fire in accordance with the regional fire plan, protecting retained hollow trees and allowing woodland and wetland-edge vegetation to develop.

  • Inspect rehabilitation areas after rainfall for erosion, ponding, blocked drainage and exposed habitat features.
  • Keep cattle, pigs, horses and other introduced animals from damaging plantings and retained habitat where the project can control access.
  • Remove redundant fencing, wire, netting and construction materials that could entangle bats or restrict movement.

Rehabilitation actions: Monitor success

Monitor survival and growth of plantings, persistence of hollow trees, condition of creeklines and wetland edges, weed cover, predator activity and the integrity of reinstated logs and rocks.

Use repeated acoustic monitoring at suitable retained habitat where the approval requires evidence of continued bat use.

Interpret acoustic results with the same caution as pre-clearing data, because detector files are not an abundance measure and calls can overlap among Top End species.

Set project-specific success measures with the ecologist, because the supplied documents do not provide numerical rehabilitation thresholds for this species.

  • Record monitoring dates, detector locations, equipment, weather, habitat condition, call identifications and corrective actions.
  • Continue monitoring until the approved survival, habitat condition and maintenance criteria are met.
  • Escalate persistent absence, roost damage, mortality, severe weed invasion or failed plant establishment to the project environmental officer and relevant authority.

Sources