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Semon's Roundleaf Bat (Hipposideros semoni)

Semon's Roundleaf Bat is a small insectivorous bat of north-eastern Queensland, with an isolated population reported from Kroombit Tops and a few records in New Guinea. It is listed as Vulnerable under the EPBC Act and Endangered in Queensland. On development sites, the main concerns are loss or disturbance of roosts, clearing of rainforest and riparian habitat, habitat fragmentation and fire-related changes in prey availability.

Conservation status

Commonwealth, EPBC Act 1999: Vulnerable.

Queensland, Nature Conservation Act 1992: Endangered.

Breeding season

The annual cycle is poorly documented. The only species-specific breeding timing in the conservation advice is birth around November. The survey guideline lists no known seasonal considerations, so the calendar below should be treated as a planning guide rather than a confirmed range-wide schedule.

Any suspected maternity roost found during clearing or construction should be protected until a qualified bat ecologist has assessed occupancy, breeding status and appropriate work controls.

  • Breeding and births: Females give birth to one young per year, around November. The timing of mating and gestation is not documented for this species.
  • Dependent young: A single young is produced around November. The duration of the flightless and dependent period is not documented in the species account, so the sensitive period cannot be defined more precisely from the supplied Australian sources.
  • Survey planning: The survey guideline provides no seasonal restriction for this species. Acoustic surveys should be designed around local weather, access and habitat conditions, with effort distributed across suitable roost and foraging areas.
  • Highest clearing risk: Risk is highest around the reported November birth period and the following dependent-young period. Because the duration of dependence is not known for this species, avoid disturbance to suspected maternity roosts from before births through the period when young are confirmed volant.

Identification

This is a small, dark smoky-grey leaf-nosed bat with a distinctive noseleaf and diagnostic echolocation call. Acoustic detection is generally more reliable than capture because its slow, manoeuvrable flight allows it to avoid conventional mist nets.

The fur is relatively long, ruffled and dark smoky-grey, with a paler belly. Whitish-brown hair covers parts of the wing membrane near the body. The ears are particularly long, narrow and sharply pointed.

The noseleaf is well developed and square-shaped. It has two wart-like protuberances, one near the centre and one on the posterior edge. The upper noseleaf has four depressions, and the lower section has two supplementary leaflets on each side.

Head and body: Approximately 40 to 50 mm

Forearm: Approximately 42 to 50 mm in the survey guideline account

Weight: 6 to 10 g

Flight: Slow and fluttering, usually within 2 m of the ground

Identification: Similar species and sex differences

The two wart-like noseleaf protuberances help separate this species from other sympatric small leaf-nosed bats. It lacks the pointed lancet on the upper noseleaf that is characteristic of Rhinolophus species.

It is distinguished from the closely related Northern Leaf-nosed Bat, Hipposideros stenotis, by its longer central wart. The two species are allopatric in Australia according to the survey guidelines.

Females are larger than males. Males and females also produce different constant-frequency echolocation calls.

Male call: Approximately 94 to 95 kHz

Female call: Approximately 74 to 75 kHz

Other reported call band: 83 to 85 kHz

Identification: Field signs and survey detection

The characteristic constant-frequency call and pulse structure are considered diagnostic and are unlikely to be confused with other Australian hipposiderid or rhinolophid bats. A positive acoustic record should contain at least four consecutive pulses, with recordings presented so that identification can be independently checked.

There are no documented species-specific tracks, scats, nests, sloughs or eyeshine features in the supplied sources. Roost inspection, where safe and authorised, may reveal bats in caves, buildings, mines, culverts, tree hollows, rock fissures or boulder piles.

  • Use electronic bat detectors as the primary non-invasive detection method.
  • Use harp traps rather than relying on conventional mist nets where capture is needed, because the species is difficult to catch while foraging.
  • Record the call with a suitable frequency-division or time-expansion system, and retain calibration information for analogue recordings.

Distribution: Australian range

In Australia, Semon's Roundleaf Bat is concentrated in coastal and near-coastal north-eastern Queensland. The available sources do not provide a complete state-by-state bioregional account, and the southern extent remains uncertain.

The main Australian range extends along eastern Cape York Peninsula south towards Townsville. The survey guideline account describes records from coastal Queensland, from Cape York to just south of Cooktown, with the southern limit unclear.

The species has been recorded around Iron Range, Kulla, Oyala Thumotang and Cape Melville national parks, and near Cooktown. Additional records include streams and rivers adjacent to rainforest.

An isolated subpopulation has been reported from Kroombit Tops, south of Gladstone. A further call record from St Mary's State Forest near Maryborough was unconfirmed, and records from the Torres Strait are possible but not confirmed in the supplied sources.

Primary Australian region: North-eastern Queensland, including eastern Cape York Peninsula

Reported southern outlier: Kroombit Tops, south of Gladstone

Known range outside Australia: A few records in New Guinea

Distribution: Population size and trend

The species is rare and probably occurs at low densities, even in core habitat. Population estimates remain uncertain because survey effort has been limited and the bat is difficult to capture.

The Australian range is reported to have receded northwards by approximately 30 percent over the last 60 years. The conservation assessment inferred a continuing decline, although the likely rate was considered to be less than 30 percent over 20 years, or approximately three generations.

Estimated extent of occurrence: 162,008 km²

Calculated area of occupancy: 128 km², with earlier assessment suggesting it may be as high as 2,000 km² because of limited sampling

Estimated mature population: Likely between 2,500 and 10,000 individuals

Largest subpopulation: Likely fewer than 1,000 mature individuals

Locations: More than 5, but probably fewer than 10

Habitat: Habitat types

Semon's Roundleaf Bat is mainly associated with tropical rainforest and nearby riparian habitat, but it can also use monsoon forest and open savannah woodland. The supplied sources do not give a confirmed elevation limit or a complete vegetation-community classification.

The species mainly occurs in rainforest. Records also come from streams and rivers beside rainforest, and from monsoon forest and open savannah woodland.

For project assessment, retain connected rainforest, riparian forest, likely movement corridors and nearby potential roost structures. Habitat use is poorly understood, so absence from existing records should not be treated as proof of absence.

Primary habitat: Tropical rainforest

Other recorded habitat: Riparian forest beside streams and rivers, monsoon forest and open savannah woodland

Elevation limit: Not specified in the supplied sources

Habitat: Structural features

Habitat containing caves, rock fissures, mines, boulder piles, buildings, road culverts and tree hollows may provide roosting opportunities. Vegetation near watercourses and forest edges may also be used for foraging.

The conservation advice recommends targeted surveys before clearing or development in the species' distribution, with particular attention to roost sites and important subpopulations.

Foraging habitat: Diet and feeding flight

The species is insectivorous and usually forages close to the ground in forested or riparian areas. Detailed information on its foraging range, prey selection and sex-specific habitat use is not available.

Moths may form the main part of the diet, although the species feeds on insects generally. Its short, broad wings support slow, manoeuvrable flight, usually within 2 m of the ground.

The different echolocation frequencies of males and females may reflect or drive differences in foraging and diet, but the available sources do not define those differences.

Diet: Insects

Likely main prey: Moths

Typical flight height: Usually within 2 m of the ground

Foraging range: Not quantified in the supplied sources

Foraging habitat: Foraging habitat on project sites

Potential foraging habitat includes tropical rainforest, monsoon forest, open savannah woodland and forest adjoining streams or rivers. Retain vegetation corridors and riparian links between potential roosts and feeding areas where practicable.

The conservation advice identifies fire-related effects on prey abundance as a possible threat. Avoid treating recently burnt or cleared areas as equivalent to intact foraging habitat.

Breeding habitat: Breeding biology

Semon's Roundleaf Bat has a slow reproductive rate, with one young per female each year. The species' maternity-roost requirements are not well documented, so all confirmed or suspected maternity roosts should be treated as sensitive until assessed by a suitably experienced bat ecologist.

Breeding pattern: One reproductive event per year is reported

Birth period: Around November

Litter size: One young

Age at sexual maturity: Estimated at 1 to 2 years, based on information from other Hipposideros species

Longevity: Probably around 12 years, based on information from other Hipposideros species

Generation length: Approximately 6 to 7 years

Gestation: No species-specific duration is available in the supplied sources

Breeding habitat: Maternity habitat

Recorded roost types include caves, abandoned buildings, houses, mines, rock fissures, boulder piles, road culverts, tree hollows and other trees. These structures may include maternity roosts, but the species-specific requirements for maternity and non-breeding roosts remain poorly characterised.

Do not seal, remove, blast or materially alter a suspected roost without first determining whether bats or dependent young are present. The conservation advice specifically identifies clearing and mining near roost sites or important subpopulations as activities likely to have a significant impact.

Sheltering habitat: Known roost types

The species uses a wide range of natural and artificial roosts. Roost locations are poorly known, and disturbance or loss of a roost may affect bats even where only a small number of animals is seen.

Known or reported roosts include caves, rock fissures, mines, boulder piles, buildings, houses, abandoned buildings, road culverts, tree hollows and trees.

The available sources do not provide entrance dimensions, cavity volumes, tree diameter thresholds, colony sizes or confirmed roost temperature and humidity requirements.

Roost dimensions: Not specified in the supplied sources

Roost colony size: Not specified in the supplied sources

  • Inspect caves, mine workings, rock fissures, boulder piles, culverts, buildings and tree hollows within or near the work area.
  • Check topographic and geological mapping and consult relevant Queensland agencies, caving groups, bat researchers and local councils when potential underground roosts occur.
  • Protect known roosts and maintain habitat quality around them.

Sheltering habitat: Managing suspected roosts

Human visitation and mining have been identified as plausible causes of roost disturbance, destruction or reduced accessibility, although these impacts have not been demonstrated for this species.

Where a roost is found during clearing, construction or inspection, stop work around the roost and obtain advice from a suitably qualified bat ecologist and the relevant fauna authority before changing the entrance or structure.

Threats: Clearing and development

Habitat loss and degradation are the main identified threats. Evidence is limited for several threat pathways, but the species' low density, restricted area of occupancy and dependence on suitable roosts mean that local impacts can be important.

Clearing, mining and other works can remove or disturb roosts, reduce rainforest and riparian habitat, and fragment habitat between roosts and foraging areas.

The conservation advice states that further habitat loss from land clearing and mining in areas containing roost sites or important subpopulations is likely to have a significant impact. Targeted surveys are recommended before clearing or development within the species' distribution.

  • Search potential roosts before clearing, demolition, blasting, excavation or mine rehabilitation.
  • Retain known roosts and avoid reducing access to their entrances.
  • Maintain connected rainforest and riparian vegetation around confirmed records and potential roosts.
  • Use acoustic monitoring as the primary presence survey method, with trapping only where appropriately authorised and needed.

Threats: Fire and habitat change

Increased fire extent, frequency and intensity are possible threats because fire may reduce insect prey abundance and alter rainforest and riparian habitat. Habitat change associated with pastoralism is also identified as a possible threat.

The sources do not provide a species-specific fire interval or prescribed-burning threshold. Fire planning should therefore retain rainforest, riparian vegetation and known roost surrounds, and should consider prey habitat as well as direct roost protection.

Threats: Predation and other pressures

Predation by feral cats at roosts and roost entrances is a possible threat. Human visitation may disturb roosts, and mining may destroy or reduce access to roost structures.

The supplied sources do not identify disease, road mortality or hydrology change as demonstrated threats for this species. Works near streams and rivers should nevertheless avoid removing riparian habitat or altering access to known roosts.

Survey methodology: 1. Passive acoustic detection

Survey Semon’s Roundleaf Bat, Hipposideros semoni, as a low density, poorly known species that can be difficult to catch but has a distinctive echolocation call. Use non-invasive acoustic detection as the primary method, and inspect potential roost habitat before clearing or development.

Deploy unattended electronic bat detectors near potential roosts and in representative foraging habitat. The species’ characteristic constant frequency call is diagnostic and is unlikely to be confused with other Australian hipposiderids or rhinolophids.

Place detectors near caves, rock fissures, mines, boulder piles, buildings, road culverts and tree hollows, and along vegetation corridors, watercourses and other likely flyways.

Record sufficient call detail for independent verification. Positive sequences should contain at least four consecutive pulses, and displayed calls should use 10 kHz intervals.

Use calibrated recording equipment and state the detector type, recording settings, calibration method and location in the survey report.

Characteristic call frequencies: Approximately 75 kHz for females and 95 kHz for males; the conservation advice also records calls in the 83 to 85 kHz band.

  • Use electronic detectors as the preferred non-invasive method where access and safety allow.
  • Do not rely on a detector placed only at a roost entrance, because search-phase calls may not be recorded there.
  • Survey both suitable roosting areas and nearby foraging habitat rather than treating a negative result at one location as evidence of absence.

Survey methodology: 2. Detector effort for areas smaller than 50 hectares

For a project area smaller than 50 hectares, the threatened bat survey guideline specifies a minimum combination of unattended detectors, attended detectors and harp traps. Apply the effort across representative habitat and potential roost locations, not at one point only.

Project area covered by the guideline effort: Less than 50 hectares

Unattended detector effort: 16 detector nights over at least 4 nights

Attended detector effort: 6 detector hours over at least 3 nights

Harp trap effort: 16 trap nights over at least 4 nights

  • Complete at least 16 unattended detector nights over a minimum of 4 nights.
  • Complete at least 6 hours of attended detector work over a minimum of 3 nights.
  • Complete at least 16 harp trap nights over a minimum of 4 nights where trapping is appropriate and authorised.
  • Record the position and route of attended detector transects using GPS, and report the survey area, habitat, dates, weather and effort at each location.

Survey methodology: 3. Trapping and roost inspection

Use trapping to confirm presence only where it is necessary, safe and permitted. Semon’s Roundleaf Bat is difficult to catch in conventional mist nets because its slow, manoeuvrable flight can avoid them.

Inspect maps and available records before field work to identify caves, mines, rock fissures and other possible roosts. Contact relevant Queensland agencies, caving groups, bat researchers and local councils where appropriate.

Known roost types: Caves, rock fissures, mines, boulder piles, buildings, road culverts and tree hollows

Recorded foraging habitat: Tropical rainforest, monsoon forest, open savannah woodland, and streams and rivers adjacent to rainforest

  • Prefer harp traps in forest habitats where subterranean roosts are unknown or not expected.
  • Use monofilament mist nets only where a suitably experienced and authorised ecologist considers them appropriate.
  • Do not enter unsafe mines, caves or fissures, and do not disturb a suspected roost simply to confirm occupancy.
  • Treat roost searches as a disturbance risk and use acoustic detection from outside the roost wherever possible.

Survey methodology: Minimum effort and reporting

  • Use the guideline effort as the minimum for a project area smaller than 50 hectares, and increase effort where habitat is extensive, connected, poorly sampled or contains multiple potential roosts.
  • Plan surveys across suitable wet and dry season conditions where the project risk warrants seasonal coverage, because the conservation advice recommends bi-annual monitoring across the species’ range.
  • Have difficult call identifications independently checked by a suitably experienced bat ecologist, particularly where H. stenotis or other leaf-nosed bats may occur.
  • Report all detector locations, GPS tracks, dates, nights, hours, trap nights, weather, habitat, equipment settings, call files and identification decisions.
  • Submit confirmed records and relevant negative survey information to the relevant state wildlife database, and provide records to the project regulator or approval authority where required.
  • Record the common and scientific name as Semon’s Roundleaf Bat, Hipposideros semoni, and retain the original sound files and metadata.

Before habitat disturbance: Avoid and minimise habitat loss

Treat any rainforest, monsoon forest, riparian forest or adjacent open woodland with suitable roost features as potential habitat. The species is nationally listed as Vulnerable and Queensland listed as Endangered, so avoid removing roosts or important subpopulations unless the project has addressed the relevant approval requirements.

Retain known and potential roost sites, particularly caves, rock fissures, mines, boulder piles, buildings, culverts and tree hollows.

Avoid clearing rainforest and riparian forest, and retain connected vegetation between roosting areas and nearby foraging habitat.

Avoid activities that reduce access to roosts, including sealing, gating, filling, destabilising or obstructing entrances without species-specific advice and approval.

Keep clearing, mining, earthworks and construction outside important subpopulations and known roost areas wherever practicable.

  • Use the smallest practicable clearing footprint and retain native vegetation around roosts and watercourses.
  • Do not assume that an apparently unused roost is unoccupied, because the species may use different roosts and has poorly known seasonal requirements.
  • Include nearby habitat in the assessment where a project site contains no roost but is connected to rainforest or riparian forest.

Before habitat disturbance: Check approvals and plan the works

Check the current EPBC Act listing and determine whether the proposed action is likely to have a significant impact on this nationally listed species. Refer the action where required.

Check Queensland threatened fauna requirements, permits and licences before survey, trapping, handling, relocation, roost disturbance or clearing. Confirm state requirements in other jurisdictions if a record is outside Queensland.

Prepare a fauna management plan that identifies potential roosts, survey results, no-go areas, work limits, fauna spotter catcher responsibilities, stop-work triggers and reporting requirements.

Australian listing in the supplied conservation advice: Vulnerable under the EPBC Act

Queensland listing supplied with the profile: Endangered

  • Obtain approval before disturbing a known roost or important subpopulation.
  • Use suitably qualified and authorised personnel for acoustic identification, trapping, handling and any relocation.
  • Include a contingency for a maternity roost, pups, an injured bat or an unexpected roost in a building, culvert, tree or mine.
  • Stage works so that high-risk roost areas are dealt with under direct ecological supervision and lower-risk works proceed separately.

Before habitat disturbance: Prepare the site

Complete the pre-clearance survey before machinery enters the work area, including acoustic survey and inspection of potential roost features.

Mark known and potential roosts, retained rainforest and riparian vegetation, connected flight paths, exclusion areas and machinery access limits on site plans and in the field.

Install exclusion fencing or other physical controls where they can protect retained habitat without blocking bat access to a roost.

Brief operators and the fauna spotter catcher on the species’ appearance, diagnostic call, roost types, work limits and stop-work procedure.

  • Inspect trees, buildings, culverts, boulder piles, rock fissures, mines and caves within and immediately beside the disturbance footprint.
  • Schedule clearing to avoid periods identified by the project ecologist as likely to contain dependent young, and do not undertake exclusion or sealing where flightless pups may be present.
  • Confirm that lighting, noise, dust, vibration, blasting and night works will not unnecessarily disturb retained roosts.
  • Keep a current site map showing all habitat features retained, removed or requiring further inspection.

During habitat disturbance: Daily controls and machinery coordination

Use daily ecological controls while clearing or construction occurs. The fauna spotter catcher must be able to stop machinery, inspect habitat features and obtain specialist assistance if a bat or suspected roost is found.

Complete a pre-start inspection of exclusion fencing, no-go areas, access routes, retained vegetation and known roosts.

Keep the fauna spotter catcher in direct communication with the operator and position machinery so the spotter can see the active work face and any habitat feature being disturbed.

Clear progressively, allowing the spotter catcher to inspect each section before machinery advances.

Stop work immediately if the spotter catcher identifies a bat, suspected roost, occupied building, tree hollow or other feature requiring specialist assessment.

  • Maintain exclusion zones around known roosts and retained habitat for the duration of the relevant works.
  • Do not direct lights, dust suppression, high noise or unnecessary personnel into a roost entrance.
  • Do not seal, fill, gate or otherwise alter a roost entrance while bats or dependent young may be inside.
  • Keep machinery, spoil and materials away from retained cave, fissure, mine, culvert, boulder pile and tree hollow habitat.

During habitat disturbance: Handle habitat features carefully

Inspect hollow-bearing trees, loose bark, logs, rocks, boulder piles, culverts, buildings and other structures before removal or relocation. The species is known to use tree hollows, boulder piles, buildings and road culverts as well as caves, fissures and mines.

Use staged removal and pause between cuts or movements where a feature could conceal a bat. Apply the approved project fauna protocol for any occupied feature.

Do not enter caves, mines or fissures unless the person is authorised, the site is safe and the approved method requires entry.

  • Retain habitat features in place wherever practicable.
  • If an approved relocation is required, place the feature in nearby retained habitat that provides suitable shelter and access, under the direction of the project ecologist.
  • Do not move a suspected maternity feature without specialist advice, particularly if pups or a dependent young bat are present.
  • Keep records of each feature inspected, its location, condition, action taken and any animal detected.

During habitat disturbance: Respond to animals and trigger events

If a Semon’s Roundleaf Bat is found, stop the immediate activity and keep people, dogs, lights and machinery away from the animal and suspected roost.

Only a person authorised under the project approval and relevant wildlife legislation may capture, handle or relocate the bat.

Use the least intrusive response that protects the animal, normally leaving it undisturbed in a safe retained roost or allowing an experienced fauna handler to assess it.

If relocation is approved, move the animal only to nearby retained habitat selected by the project ecologist, and document the release location and time.

Send an injured, sick or grounded bat to an appropriately qualified wildlife carer or veterinarian through the approved wildlife rescue pathway; do not provide food, water or treatment unless directed by that pathway.

Stop work across the affected area for a suspected roost, maternity roost, dependent young, repeated bat detections at the work face, injury, mortality or damage to a retained roost.

Notify the project environmental officer, project ecologist and approval authority when a stop-work trigger occurs, as required by the approval or fauna management plan.

  • Do not chase, net or handle a bat solely to obtain a photograph or confirmation if acoustic or expert identification is available.
  • Do not resume work until the authorised ecologist has inspected the feature, set controls and recorded the clearance decision.
  • Treat repeated diagnostic calls near a proposed roost as a reason for further assessment, even if no bat is seen.

During habitat disturbance: Keep records

  • Record daily pre-start checks, weather, work areas, personnel, fauna observations, call detections, habitat features inspected, animals handled, relocations, injuries, mortalities and stop-work events.
  • Retain photographs, call files, GPS points, permits, release details, veterinary or wildlife carer advice and correspondence with regulators.
  • Report any impact to a known roost, important subpopulation or retained habitat feature through the project incident process and relevant statutory process.
  • Update the fauna management plan when monitoring or incidents show that the controls are not protecting the species.

After habitat disturbance: Complete post-clearance checks

Post-clearance checks must confirm that no bat, dependent young or occupied roost feature remains in the disturbance area and that retained habitat and controls are functioning. Monitoring should focus on roost use, population trends and the effects of the works.

Inspect the completed clearing footprint, retained vegetation edges, buildings, culverts, rock features and tree hollows for trapped, injured or displaced bats.

Check that no roost entrance has been blocked by spoil, sediment, fencing, construction materials, erosion control or permanent works.

Remove temporary exclusion fencing only when the fauna management plan and project ecologist confirm that it is safe to do so.

Report any dead, injured or displaced bat immediately through the approved fauna incident pathway.

  • Undertake an additional acoustic check where works occurred near a known roost or where pre-clearance detections were positive.
  • Check retained roosts after blasting, vibration, excavation, lighting changes, fire or other works that could affect their structure or accessibility.
  • Do not reopen or alter a closed work area until the required post-clearance inspection is complete.

After habitat disturbance: Monitor retained habitat and roosts

Monitor known roosts and important subpopulations using an integrated programme suited to the approval conditions. The conservation advice recommends bi-annual monitoring across the species’ range, including wet and dry season surveys.

Use acoustic detectors at known roosts and nearby foraging areas, and repeat methods consistently so changes in activity can be interpreted.

Monitor the condition and accessibility of caves, fissures, mines, buildings, culverts, boulder piles and tree hollows retained by the project.

Assess changes in rainforest, riparian forest and other foraging habitat, including effects from fire, clearing, weeds, predators and altered watercourses.

Monitoring frequency recommended in the conservation advice: Bi-annual monitoring, including wet and dry seasons

Monitoring focus: Population trends, known roosts, distribution, management effectiveness and relative threat impacts

  • Set monitoring locations, frequency, call identification rules and response thresholds before works finish.
  • Compare post-work detections with the pre-work baseline rather than relying on a single night’s result.
  • Escalate a sustained loss of detections, roost damage, new disturbance or evidence of injury for ecological review and regulator notification where required.

After habitat disturbance: Close out and report

  • Submit final survey, clearance, incident, relocation and monitoring records to the project approval authority and relevant state wildlife database where required.
  • Document whether all habitat protection measures, rehabilitation commitments, offsets and monitoring actions were completed.
  • Maintain roost buffers, fencing, access controls and lighting or noise controls for the period specified in the approval or fauna management plan.
  • Apply offsets or other approved conservation measures if residual impacts remain after avoidance and mitigation.

Rehabilitation actions: Restore habitat and roost access

Rehabilitation should restore connected native habitat around retained roosts and foraging areas, while protecting roost access and reducing threats. Prioritise habitat quality and known roost sites over cosmetic reinstatement of cleared ground.

Re-establish native rainforest, monsoon forest, riparian vegetation and suitable open woodland where these communities were disturbed and are appropriate to the site.

Use locally appropriate native plant species selected by the project ecologist and restoration practitioner for the original vegetation community; the supplied documents do not specify a planting list for this species.

Maintain connected vegetation between roosts, watercourses and foraging areas, and avoid creating bright, exposed gaps at roost entrances or along movement routes.

Reinstate natural drainage and riparian structure without flooding, filling or obstructing known roost entrances.

Retain or reinstate suitable logs, boulder piles, rock fissures and tree hollows only where they are naturally present or approved as habitat features.

Use artificial roost structures or nest boxes only if a bat ecologist designs and approves them for the site, because species-specific artificial roost requirements are not established in the supplied documents.

  • Protect restored vegetation from machinery, grazing, repeated fire, weeds and unauthorised access.
  • Do not use rehabilitation materials that block caves, mines, culverts, fissures or tree hollow entrances.
  • Do not assume that a new structure replaces a damaged natural roost without monitoring evidence.

Rehabilitation actions: Manage fire, weeds and predators

Develop a fire regime that maintains rainforest and riparian habitat and avoids extensive, frequent or intense fire near important subpopulations and foraging habitat.

Assess the species’ population-level response to fire regimes where fire management is part of the project, as recommended in the conservation advice.

Control weeds that reduce native vegetation structure or obstruct access to retained roosts and watercourses.

Assess feral cat activity around important subpopulations and apply approved local or broad-scale control where justified and lawful.

  • Do not burn retained or rehabilitated habitat without a site-specific ecological assessment and approval.
  • Keep rehabilitation works and predator control away from roost entrances unless the action has been assessed for disturbance.
  • Record fire, weed and predator management actions so future bat monitoring can assess their effect.

Rehabilitation actions: Measure rehabilitation success

Monitor plant establishment, vegetation cover, connectivity, roost accessibility, roost structure and bat activity against a documented baseline.

Use acoustic monitoring at retained and rehabilitated habitat, with consistent detector placement and reporting across wet and dry seasons where required.

Inspect rehabilitated roost features after storms, fire, flooding, erosion, vandalism and construction activity.

Review the rehabilitation plan if the species stops using a retained roost, if diagnostic calls decline, or if habitat connectivity or roost access is reduced.

Recommended conservation priority: Protect roost sites and important subpopulations, maintain habitat quality, assess population trends and assess the relative impacts of threats

Recommended monitoring approach: Integrated monitoring at known roosts and across the species’ range, including wet and dry seasons

  • Set measurable completion criteria for survival of plantings, weed cover, erosion control, roost access and acoustic detections before rehabilitation begins.
  • Continue monitoring for the period required by the approval, and extend it where results show delayed establishment or ongoing threat.
  • Submit rehabilitation and monitoring results to the project environmental officer, regulator and relevant state wildlife database where required.

Sources