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Black-banded Fruit Dove (Ptilinopus alligator)

The Black-banded Fruit Dove is a large, monotypic pigeon endemic to the western edge of the Arnhem Land escarpment in the Northern Territory. It uses patches of monsoonal rainforest, where it feeds mainly on forest fruit and breeds in trees, so clearing of rainforest patches and disturbance around breeding trees may affect local records on development sites.

Conservation status

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

Identification

This is a large fruit-eating pigeon with a distinctive white, black and grey plumage pattern. The available sources provide limited information on vocalisations, sex differences and field signs other than the nest.

Adults measure 38 to 44 cm and weigh 450 to 570 g. The head, neck and upper breast are white. The back and upperwing are black, grading to grey on the rump. The tail is black with a broad grey terminal band, and the grey underparts are separated from the white head and neck by a broad black band.

Length: 38 to 44 cm

Weight: 450 to 570 g

Plumage: White head, neck and upper breast; black back and upperwing; grey rump and underparts; black tail with a broad grey terminal band

Identification: Separation from similar pigeons

The combination of a white head and neck, broad black breast band, black upperparts, grey rump and grey-banded tail should be recorded carefully in the field. The species was formerly treated as a subspecies of the Banded Fruit Dove, Ptilinopus cinctus, but the supplied documents do not provide a field comparison or diagnostic differences.

Identification: Field signs

The documented nest is an open platform of sticks in a forest tree. The supplied documents do not describe tracks, scats, calls, feathers, roosts, eggs beyond a single egg, or other field signs.

  • Record the bird's plumage pattern, estimated size, location and associated rainforest patch when an observation is made.
  • Search forest trees for open stick platforms where breeding activity is suspected, and avoid disturbing the tree until the nest status is assessed.

Distribution: State and bioregional range

The Black-banded Fruit Dove is an Australian endemic with a highly restricted Northern Territory range. The supplied documents do not provide a mapped state range beyond the Northern Territory, a named bioregion, population estimates or a population trend.

The species is restricted to the western edge of the Arnhem Land escarpment in the Northern Territory. This area is within the broader Arnhem Land region, but no formal bioregion is identified in the supplied documents.

Confirmed state: Northern Territory

Documented range: Western edge of the Arnhem Land escarpment

National distribution: Endemic to Australia

  • Treat records from suitable rainforest on or near the western edge of the Arnhem Land escarpment as potentially significant because the documented range is restricted.
  • Do not extend the confirmed range to other Australian states without additional locality or atlas evidence.

Distribution: Strongholds and population status

The supplied documents do not identify strongholds, subpopulations, population size, density or a population trend. Birds of the World describes the species as monotypic, meaning no subspecies are recognised in that source.

Subspecies: Monotypic

Population size: Not reported in the supplied documents

Population trend: Not reported in the supplied documents

Conservation status: Near Threatened in the Northern Territory; Least Concern on the IUCN listing cited by the supplied sources

Habitat: Habitat type

The documented habitat is patchy monsoonal rainforest on the western edge of the Arnhem Land escarpment. The sources do not give elevation limits, vegetation community names, patch sizes or structural measurements.

The species favours patches of monsoonal rainforest. Its range is confined to the western edge of the Arnhem Land escarpment, indicating a geographically restricted association with this habitat.

  • Map and retain monsoonal rainforest patches within or near the documented range during project planning.
  • Check rainforest trees and fruiting vegetation before clearing, particularly where a patch is connected to other rainforest or contains suitable nesting trees.

Habitat: Habitat structure

The species feeds on fruit from forest trees and places its nest in a forest tree. These records indicate that mature or fruiting trees within rainforest patches are relevant habitat features, although no tree diameter, height, canopy cover or patch-area thresholds are provided.

Key habitat feature: Forest trees that provide fruit and nesting sites

Elevation limits: Not reported

Climate limits: No limits are specified beyond the association with monsoonal rainforest

Foraging habitat: Diet

The Black-banded Fruit Dove is primarily a fruit-eater that forages in monsoonal rainforest. Figs are specifically identified as an important food resource.

The diet consists predominantly of fruit from forest trees, with a particular preference for figs. The supplied documents do not list other plant species or provide feeding rates.

Main food: Fruit from forest trees

Named food plant: Figs

Feeding rate: Not reported

  • Record fruiting fig trees and other fruiting forest trees within the work area and access corridor.
  • Avoid assuming that a rainforest patch is unused when no birds are seen, because the documented food resource is distributed among forest trees.

Foraging habitat: Foraging area

The available sources place feeding within the species' monsoonal rainforest habitat but do not report home-range size, daily movement distance, flock size or use of adjoining vegetation.

Foraging range: Not reported

Documented foraging setting: Monsoonal rainforest and forest trees

  • Assess the whole rainforest patch and nearby fruiting trees rather than only the proposed clearing footprint when evaluating potential foraging habitat.

Breeding habitat: Breeding biology

Breeding has been documented in forest trees within the species' monsoonal rainforest habitat. The available information is limited to nest form and clutch size, with no reported breeding months or reproductive rates.

The species builds an open platform of sticks in a forest tree and lays a single egg. The supplied documents do not state the incubation period, fledging period, age at maturity, lifespan or breeding season.

Breeding season: Not reported

Clutch size: Single egg

Incubation: Not reported

Age at maturity: Not reported

Lifespan: Not reported

Breeding habitat: Breeding habitat

Breeding habitat consists of forest trees within the species' monsoonal rainforest environment. The nest is an exposed, open stick platform rather than a cavity, but the sources do not provide nest height, tree species, tree size or distance from habitat edges.

Nest type: Open platform of sticks

Nest location: In a forest tree

Known nest dimensions: Not reported

  • Inspect forest trees for open stick platforms before clearing or commencing works near rainforest patches.
  • If a suspected nest is found, retain the nest tree and minimise disturbance until its status has been assessed by the project fauna ecologist.

Sheltering habitat: Documented refuge

The supplied documents identify monsoonal rainforest as the species' refuge habitat but do not describe roost trees, sheltering vegetation, cavities or other specific refuges.

The species finds refuge and sustenance in patches of monsoonal rainforest. No separate roost, den, hollow, burrow, ground-cover or shelter dimensions are reported.

Documented shelter: Patches of monsoonal rainforest

Roost type: Not reported

Hollow, burrow or den use: Not reported

  • Retain rainforest patches and forest trees during site design where practicable, including trees that may provide daytime cover or roosting locations.
  • Include retained rainforest edges and interior trees in pre-clearing inspections, not only trees with visible nests.

Threats: Clearing and fragmentation

The supplied documents do not provide a species-specific threat assessment. For projects in the documented range, the most direct management concern supported by the species' habitat and nesting information is loss or disturbance of monsoonal rainforest patches and forest trees.

Clearing monsoonal rainforest may remove feeding habitat, fruiting trees and potential nesting trees. Breaking rainforest into smaller patches may also reduce the amount of connected habitat available to a species with a restricted documented range.

  • Avoid clearing monsoonal rainforest patches within the documented range where practicable.
  • Map rainforest patches, fruiting trees and potential nest trees before finalising clearing limits.
  • Keep clearing footprints and access routes away from retained rainforest trees and patch edges where practicable.

Threats: Construction disturbance

An open stick nest in a forest tree may be exposed to disturbance during clearing and construction. The supplied documents do not quantify disturbance distances or identify a species-specific road, fire, predator, disease or hydrology response.

Road impacts: Not reported in the supplied documents

Fire impacts: Not reported in the supplied documents

Predation: Not reported in the supplied documents

Disease: Not reported in the supplied documents

Hydrology change: Not reported in the supplied documents

  • Use a fauna spotter catcher to inspect forest trees before clearing.
  • Stop work and seek ecological direction if an open stick nest or Black-banded Fruit Dove is found in the work area.
  • Do not apply unverified species-specific buffer distances when the supplied information does not provide them; obtain project-specific advice from the fauna ecologist.

Survey methodology: 1. Diurnal searches and call detection

The Black-banded Fruit Dove is restricted to patches of monsoonal rainforest on the western edge of the Arnhem Land escarpment. Survey effort should focus on retained rainforest, edges, canopy feeding areas and fruiting trees, especially figs.

Search retained and adjoining monsoonal rainforest during daylight, when birds may be detected in the canopy or feeding trees.

Use experienced observers to scan the canopy and listen for calls along walked transects through all rainforest patches that may be disturbed.

Record the search route, time, weather, visibility, habitat condition, fruiting trees and all sightings or calls.

Body length: 38 to 44 centimetres

Body mass: 450 to 570 grams

  • Give particular attention to forest trees bearing fruit, especially figs, because fruit is the documented food of this species.
  • Use binoculars where possible and confirm identification from the white head, neck and upper breast, black back and upperwing, grey rump and underparts, and black tail with a broad grey terminal band.
  • Treat an observation as credible only when the bird, call or diagnostic field marks can be distinguished from other pigeons and doves.

Survey methodology: 2. Canopy and fruit-tree inspection

Inspect the canopy of rainforest trees from ground-based vantage points before clearing or construction starts.

Map fruiting trees and other mature forest trees within and beside the disturbance footprint, with particular attention to figs and trees connected to retained rainforest.

  • Repeat inspections at suitable times of day if visibility is poor or the canopy cannot be searched from the initial vantage points.
  • Record the tree location, species where known, fruiting condition, observed birds and the area of connected rainforest around it.

Survey methodology: 3. Targeted pre-clearance search

Complete a targeted search immediately before disturbance in every monsoonal rainforest patch, rainforest edge and fruiting tree area within the work zone.

Search from the ground and from safe vantage points without climbing trees or entering unsafe work areas.

The supplied documents do not provide a prescribed number of nights, hours, trap nights, transect spacing or survey area for this species, so set effort through the project risk assessment and the applicable Northern Territory survey requirements.

  • Do not use cage trapping or mist-netting solely for this species unless a suitably authorised wildlife professional has established that the method is necessary, approved and safe.
  • Do not infer absence from a single negative search, because the species can occur in forest canopy and the available documents do not provide detection probabilities.

Survey methodology: Minimum effort and reporting

  • Survey every monsoonal rainforest patch and connected rainforest edge that could be cleared, fragmented or affected by access, noise or construction.
  • Schedule repeat searches where canopy visibility, weather, fruit availability or access limits the first search.
  • Document dates, start and finish times, observers, methods, transect or search locations, weather, visibility, habitat, fruiting condition, results and photographs where available.
  • Submit confirmed records and suitable negative-survey information to the relevant Northern Territory wildlife database and provide records to the project environmental manager.
  • Escalate any record to the project ecologist and review the exclusion area before work resumes.

Before habitat disturbance: Avoid and minimise

Avoid clearing monsoonal rainforest wherever practicable. Retain the habitat and tree resources that support a rainforest fruit-eating pigeon restricted to a small part of the Northern Territory.

Redesign the footprint to retain rainforest patches, rainforest edges and connections between patches on the western edge of the Arnhem Land escarpment.

Retain fruiting forest trees, especially figs, within and beside rainforest patches wherever practicable.

Keep retained rainforest connected rather than leaving isolated trees or small fragments surrounded by works.

  • Map the disturbance footprint, retained vegetation, rainforest boundaries, fruiting trees and access routes before finalising the design.
  • Use the smallest practicable clearing footprint and keep machinery, stockpiles, spoil and vehicle movements out of retained rainforest.
  • Establish site-specific exclusion areas around retained habitat and clearly mark them before mobilisation.

Before habitat disturbance: Approvals and timing

Confirm the species status and approval pathway for the project with the relevant Northern Territory authority and the project environmental adviser before works begin.

Check whether the proposed action requires an EPBC Act referral or approval and obtain any required Northern Territory permits, authorisations or wildlife approvals.

The supplied species information does not identify breeding months, so obtain local advice and use the available site evidence to avoid periods when birds are nesting or dependent young may be present.

  • Include the species, its habitat and the proposed controls in the fauna management plan.
  • Stage clearing so that retained rainforest and feeding trees remain available while adjacent works proceed.
  • Stop and reassess the method if survey results show the site supports the species or if the work would remove a substantial rainforest patch or fruiting resource.

Before habitat disturbance: Site preparation

Complete and document a pre-clearance search of all proposed work areas, access tracks and temporary work sites.

Mark rainforest boundaries, retained fruiting trees and no-go areas on plans and on the ground before machinery enters the site.

Install exclusion fencing where it can protect retained rainforest, fruiting trees and connected habitat from machinery and unauthorised access.

  • Brief supervisors, machine operators and fauna spotter catchers on the bird's identification, habitat and stop-work procedure.
  • Confirm safe access, communications, first aid, transport and contacts for an authorised wildlife handler, veterinarian and wildlife carer before clearing.
  • Check the canopy and forest trees for the open stick platform nest described for this species before clearing or pruning.

During habitat disturbance: Daily controls and spotter coordination

Use active environmental controls while work is underway. A fauna spotter catcher should work within a clear chain of command and should have authority to stop machinery when a bird or occupied habitat is at risk.

Inspect exclusion fencing, habitat markers and no-go areas at the start of each shift and after heavy weather or site changes.

Hold a daily pre-start briefing covering the work area, planned clearing sequence, known habitat, spotter position, communications and stop-work triggers.

Keep the fauna spotter catcher in a safe position with a clear view of the work face and maintain direct communication with the machine operator.

Start, stop or slow machinery only through the agreed communication system, and never place the spotter catcher between machinery and a hazard.

  • Clear in stages from the disturbed edge towards retained habitat so animals have an opportunity to move away without being driven into active machinery.
  • Do not allow simultaneous clearing, vegetation burning, chipping or high-speed vehicle movements in an area being checked by the spotter catcher.
  • Recheck the canopy and retained rainforest after breaks, shift changes and any change in the clearing face.

During habitat disturbance: Habitat features and nesting trees

Treat rainforest trees and fruiting trees as species-relevant habitat and retain them unless their removal is approved and unavoidable.

Inspect any open stick platform nest in a forest tree before pruning, felling or operating machinery nearby, and stop work if it may be occupied.

Handle hollow-bearing trees, logs, rocks, burrows and wet areas under the project's general fauna procedure, because the supplied species documents do not identify these as Black-banded Fruit Dove habitat features.

  • Do not fell or disturb a tree with an active nest until the fauna spotter catcher and project ecologist have assessed it and the approved procedure has been applied.
  • Keep cleared vegetation, spoil and equipment away from retained rainforest and fruiting trees.
  • Do not relocate a nest, egg or dependent young unless this is directed by an appropriately authorised wildlife professional.

During habitat disturbance: Animal response and stop-work triggers

Stop work immediately if a Black-banded Fruit Dove is seen within the clearing zone, is injured, cannot move away safely or is associated with a nest that may be affected.

Allow the bird to move to nearby retained rainforest without chasing, cornering or repeatedly approaching it.

Only an appropriately authorised fauna handler should capture or handle the bird, and handling should be limited to what is necessary for immediate safety, assessment or approved relocation.

Relocate a healthy bird only when directed by the project ecologist or authorised wildlife professional, and place it in nearby retained rainforest with suitable cover and food trees.

  • Take an injured bird to a veterinarian or authorised wildlife carer as soon as practicable, using a ventilated, secure container and minimal handling.
  • Do not feed, water or medicate the bird unless directed by a veterinarian or authorised wildlife carer.
  • Resume work only after the fauna spotter catcher and project environmental officer have confirmed that the animal, nest and habitat risk have been managed.
  • Record every sighting, capture, injury, relocation, nest, stop-work event and release location, including date, time, coordinates, outcome and personnel involved.

After habitat disturbance: Post-clearance inspection

Post-clearance checks should confirm that no bird, nest or retained rainforest area was overlooked and that the controls remain effective during construction and operation.

Inspect the cleared area, retained rainforest edge and nearby fruiting trees after each clearing stage and again at the end of clearing.

Check for injured birds, displaced nests, damaged exclusion fencing, edge damage and unapproved entry into retained habitat.

Compare the completed clearing area with the approved footprint and investigate any difference before further work proceeds.

  • Record the inspection date, observers, area checked, habitat condition, bird observations, nest observations and corrective actions.
  • Report any new record or injured animal to the project environmental officer and relevant wildlife authority in accordance with the approval conditions.
  • Maintain access to retained rainforest and fruiting trees during construction, including after temporary works are removed.

After habitat disturbance: Monitoring and reporting

Monitor retained rainforest patches and connected habitat during construction where the risk assessment identifies ongoing disturbance or fragmentation risk.

Use repeat observations from the same mapped locations where practicable so changes in bird use, fruiting trees and habitat condition can be identified.

Report survey results, incidents, corrective actions and monitoring outcomes to the approval authority where required and submit confirmed records to the relevant Northern Territory wildlife database.

  • Review monitoring results after each construction stage and increase controls if birds stop using retained habitat, a nest is found or fruit resources are removed.
  • Keep fauna records, photographs, maps, permits, spotter logs and rehabilitation records with the project environmental documentation.
  • Apply any required offset, restoration or conservation measure in accordance with the project approval and applicable legislation.

After habitat disturbance: Maintain protection measures

Keep no-go markers, exclusion fencing and access controls in place until construction risks to retained rainforest have ended.

Prevent weeds, sediment, dust, lighting and altered drainage from degrading retained monsoonal rainforest and fruiting trees.

Remove temporary stockpiles, access tracks and equipment from retained habitat and rehabilitate those areas promptly.

  • Inspect controls after storms, flooding, fire or other events that may damage habitat or fencing.
  • Brief new contractors and maintenance crews before they enter retained rainforest or work near mapped fruiting trees.
  • Record and close out all environmental incidents and corrective actions.

Rehabilitation actions: Restore rainforest structure and food trees

Rehabilitation should rebuild connected monsoonal rainforest habitat and restore the food resources used by this fruit-eating pigeon. The supplied documents do not identify particular plant species apart from figs, so planting should follow local reference vegetation and Northern Territory ecological advice.

Re-establish locally appropriate monsoonal rainforest vegetation within temporary work areas and along retained rainforest edges.

Include locally sourced fig species where they are part of the site's reference rainforest community and are suitable for the soil, drainage and approvals.

Recreate connected vegetation between retained rainforest patches rather than planting isolated trees only.

  • Use local provenance seed or tubestock where available and approved.
  • Protect establishing plants from grazing, vehicles, weeds and fire until they are established.
  • Do not plant non-local or invasive species in or beside retained rainforest.

Rehabilitation actions: Manage threats and habitat condition

Control weeds that compete with rainforest regeneration and monitor for new infestations after construction.

Manage fire in accordance with the site's approved fire plan and the ecological requirements of monsoonal rainforest.

Control erosion, sediment, dust and altered drainage so rehabilitation areas retain rainforest moisture conditions.

  • Keep machinery and vehicle access out of rehabilitation areas unless required for approved maintenance.
  • Retain naturally regenerating rainforest trees and fruiting trees during maintenance clearing.
  • Do not install hollows, nest boxes, logs or rocks as Black-banded Fruit Dove measures unless site monitoring or the project ecologist identifies a broader fauna benefit, because these features are not documented for this species.

Rehabilitation actions: Monitor success

Monitor survival and growth of rainforest plantings, regeneration, weed cover, fire damage, connectivity and the return of fruiting trees.

Use repeat inspections and mapped photo points to compare rehabilitation areas with the retained reference rainforest.

Include targeted searches for Black-banded Fruit Doves during suitable monitoring visits, with attention to canopy use, fruiting trees and connected rainforest.

  • Set success measures for the approved rehabilitation plan, including vegetation establishment, weed control, protection from fire and maintenance of habitat connections.
  • Record bird sightings and submit confirmed records to the relevant Northern Territory wildlife database.
  • Continue maintenance and monitoring until the approved success criteria have been met, and investigate failure of plantings or habitat connections promptly.

Sources