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Inland Western Australian Fairy Shrimp (Branchinella simplex)

Branchinella simplex is a fairy shrimp recorded from a small number of locations in Western Australia. Its appearance, habitat requirements and life history are poorly documented. It is listed as DBCA Priority 1, so works near wetlands should use precautionary survey and avoidance measures while its presence is assessed.

Conservation status

Western Australia, WA Threatened and Priority Fauna List: Priority 1.

Seasonal activity and survey planning

Seasonal activity, breeding and detectability are not known for Branchinella simplex. Regional wetland surveys in arid WA can be constrained by infrequent filling and short periods of inundation, but this does not establish a species-specific season.

Species timing: Months of activity, breeding or movement are not known.

Survey planning: Plan aquatic survey around suitable site conditions and any water present. This is a general planning consideration, not a known seasonal window for the species.

The month pattern is not species-specific. Months when this fairy shrimp is present or detectable are not known.

  • Aquatic survey planning: No species-specific months are known. Plan survey when site conditions allow; this is a planning window only, not a prediction of activity.

Identification: Appearance and size

Species-level identification information is limited. Avoid relying on an assumed size, colour or field sign.

The appearance and size of Branchinella simplex have not been documented. Do not identify it from size or visual impression alone.

Identification: Similar species

Distinguishing characters and comparisons with other fairy shrimp have not been documented. Ask an aquatic invertebrate specialist to check identification using appropriate taxonomic references.

Identification: Field signs

Species-specific field signs have not been documented. Do not infer that a fairy shrimp is present from the presence of aquatic invertebrates generally.

Distribution: Known range

The species is poorly known in WA, and records indicate a sparse, incompletely documented distribution.

Atlas of Living Australia records show five Western Australian records at four distinct 0.1 degree locations. The reported coordinate range is latitude -33.2 to -28.9 and longitude 119 to 122.4. These records do not establish the full range of the species.

Distribution: WA regions

The DBCA list flags the Goldfields, Midwest and Wheatbelt regions. Specific sites for the WA records are not named.

Distribution: Conservation context

DBCA lists Branchinella simplex as Priority 1: poorly known, known from few locations, with none on conservation lands. This is a DBCA priority category, not a listing under the Biodiversity Conservation Act 2016. No national listing is given.

Habitat: Species records

Habitat associations specific to this species have not been documented.

The waterbody types, water chemistry and surrounding vegetation associated with Branchinella simplex records have not been documented.

Habitat: Regional wetland context

A survey of aquatic invertebrates in the WA arid zone describes wetlands that may fill infrequently and hold water for short periods. This is regional context only and does not establish a habitat association for this species.

Foraging habitat: Diet

The species' diet and feeding habitat have not been documented.

Diet and feeding behaviour are not known. Do not assume a particular food source or feeding zone when assessing a site.

Foraging habitat: Site assessment

Where aquatic habitat is present, record its condition and the range of wet and submerged microhabitats during survey. This is general aquatic invertebrate survey practice, not a species-specific foraging requirement.

Breeding habitat: Breeding information

Breeding habitat and reproductive timing have not been documented for this species.

Where Branchinella simplex breeds, its breeding season and reproductive biology are not known. Do not infer these details from other Branchinella species.

Breeding habitat: Precaution

If a wetland is present, assess it as potentially important aquatic habitat until survey and expert advice indicate otherwise. Avoid drainage or disturbance while its significance is being assessed.

Sheltering habitat: Shelter and persistence

Sheltering, resting and persistence sites have not been documented for this species.

How the species shelters or persists when water is absent is not known. Do not assume that dry wetland sediments are free of conservation value.

Sheltering habitat: Dry wetland areas

Some arid-zone wetlands fill infrequently and hold water briefly. Where wetland sediments or depressions may be affected, include them in the assessment rather than limiting checks to visibly wet areas.

Threats: Known information

Threats specific to Branchinella simplex have not been identified.

Its Priority 1 status reflects that the species is poorly known and recorded from few locations, not a stated threat category.

Threats: Works-related precaution

As a precaution for aquatic invertebrates, prevent avoidable changes to wetland hydrology, sediment and water quality where suitable aquatic habitat may be affected. These are general management precautions, not documented threats specific to this species.

Survey methodology: 1. Desktop assessment

Use aquatic invertebrate survey methods suited to the waterbody and its condition. Species-specific detectability and survey protocols are not known.

Check current DBCA information and available occurrence records for the project area. Do not assume the species is absent because no records are mapped.

Survey methodology: 2. Wetland inspection

Map wetlands, depressions and other aquatic features that could be affected, including areas that are dry at the time of inspection. Record water presence, extent and visible habitat condition without assuming these features are known habitat for the species.

Survey methodology: 3. Aquatic sampling

Where water is present and access is authorised, use suitable aquatic invertebrate sampling methods and retain specimens or images for expert identification where permitted. Record sampling effort and conditions. A species-specific method or detection window is not known.

Survey methodology: 4. Reporting

Document the location, date, water conditions, method and identification confidence for each survey. Seek specialist review for potential Branchinella simplex records and report findings through the applicable project and DBCA processes.

Vegetation associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific vegetation association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Ecosystem associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific ecosystem association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Soil and substrate associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific soil association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Water and wetland associations: Water-associated habitat mentioned in profile

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

Some arid-zone wetlands fill infrequently and hold water briefly.

Automatically indexed from existing profile text. Not a verified preference, mapped occurrence or habitat requirement. Check the original source and regional qualifiers before use.

Evidence: Unreviewed profile-derived candidate

Confidence: Not independently verified

Region: Scope as described in the quoted profile text; not independently verified. Profile states: WA.

Habitat use: sheltering

Attribution gap: No sentence-level reference is attached to the original profile block. Review the profile bibliography; this candidate is not source-verified.

Fauna records and mapped habitat: Not yet analysed

Record locations can be overlaid with mapping, but record frequency alone does not measure habitat preference. No species is excluded from desktop assessments by this analysis.

No quality-controlled record-to-map analysis has been completed for this species. The existing generalised distribution dots and indicative range polygons have not been treated as precise occurrence coordinates.

A defensible run needs dated, independently attributable records, coordinate uncertainty, duplicate and captive-record checks, layer versions and regional scope. Preference and absence require additional survey-effort and detection evidence.

Habitat limitations and contrary evidence: No supported exclusion recorded

Not recorded is not the same as cannot occur. Low suitability, resident habitat, breeding habitat and occasional movement are different conclusions.

This library has not established a vegetation, ecosystem or soil-type exclusion for this species. This does not mean all habitat is suitable; the evidence needed to justify an exclusion has not been assembled.

Habitat limitations and contrary evidence: Before using a negative association

  • Confirm the taxon, geographic region, life stage and habitat function covered by the evidence.
  • Check survey methods, season, repeated effort and detectability before interpreting non-detection.
  • Investigate credible contradictory records and microhabitats absent from broad mapping.
  • Do not convert a missing map class, low record count or failed data request into species absence.

Before habitat disturbance: 1. Desktop assessment

Plan early because the species is poorly known and aquatic survey opportunities may depend on water being present.

Review the clearing footprint and surrounding area for mapped wetlands and drainage features. Check the current DBCA priority listing and available records, noting that the WA records do not identify named sites.

Before habitat disturbance: 2. Field survey planning

Arrange for an aquatic invertebrate ecologist to inspect potentially affected wetland features and advise on appropriate sampling. In arid settings, consider whether a later visit after water fills is needed. The timing of such an event is not predictable from the species information.

Before habitat disturbance: 3. Work controls

Before clearing, mark wetland features and agreed exclusion areas, brief crews on the risk of sediment and water-quality impacts, and confirm stop-work and escalation procedures if an unfamiliar aquatic invertebrate is found.

During habitat disturbance: 1. Exclusion and access

Keep disturbance away from aquatic features where practicable and respond cautiously to unexpected finds.

Keep machinery, vehicle access, stockpiles and unnecessary foot traffic out of marked wetland areas. Follow approved access routes and any project-specific buffers or conditions.

During habitat disturbance: 2. Water and sediment

Avoid unapproved drainage, water diversion, sediment entry and contamination of wetlands. Do not pump or discharge water into a wetland unless the activity has been assessed and authorised.

During habitat disturbance: 3. Unexpected observations

If a possible fairy shrimp or other unfamiliar aquatic invertebrate is found, pause work in the immediate area where safe to do so. Photograph and record the observation, avoid handling unless directed by an appropriately qualified person, and notify the site environmental lead for specialist advice.

After habitat disturbance: 1. Site checks

Check that controls remain effective and document the condition of affected aquatic features.

Inspect agreed buffers and nearby wetland features for access damage, erosion, sediment movement or unapproved changes to water flow. Escalate issues through the project environmental process.

After habitat disturbance: 2. Records and follow-up

Keep survey, observation and incident records with location, date, photographs and conditions. Arrange further aquatic invertebrate assessment if required by the project approval, environmental advice or an unexpected finding.

Rehabilitation actions: 1. Restore site function

Rehabilitation should protect wetland function without claiming recovery of this species unless supported by evidence.

Where disturbance has been authorised, follow the approved rehabilitation plan to stabilise exposed ground and avoid directing sediment or contaminated runoff into wetland features. Use site-specific ecological advice.

Rehabilitation actions: 2. Monitor and adapt

Monitor the rehabilitated area for the outcomes required by the project plan, including wetland condition where relevant. Species-specific rehabilitation targets and evidence that a particular treatment benefits Branchinella simplex are not known.

Sources