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Wheatbelt Brine Shrimp (Parartemia contracta)

Parartemia contracta is an Australian brine shrimp recorded from the southern Wheatbelt and adjacent northern Wheatbelt of Western Australia. Its field identification, site-level distribution and species-specific ecology are poorly known, so works near inland saline wetlands warrant careful assessment. It is listed as Priority 1 on the DBCA Threatened and Priority Fauna List, a DBCA priority category rather than a listing under the Biodiversity Conservation Act 2016.

Conservation status

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

Seasonal activity and survey planning

Months for P. contracta activity, breeding or detectability are not documented. Plan surveys around site conditions with an ecologist rather than assuming a species-specific seasonal window.

Species-specific season: Not documented.

Survey planning: Consider wetland water conditions and survey objectives; no month-specific window is established.

Month values indicate a general planning placeholder only and do not represent observed seasonal activity.

  • Survey planning window: Planning placeholder only, not a species activity calendar. Months for activity or detectability are not documented; consult an ecologist about suitable wetland conditions before surveying.

Identification: Appearance and size

Parartemia contracta is a brine shrimp, but field characters and measurements for this species are not documented.

The appearance, diagnostic features and size of P. contracta are not documented. Do not rely on an unverified visual identification.

Identification: Similar species

Other Parartemia species occur in Western Australian saline wetlands. Diagnostic characters for distinguishing P. contracta from them are not documented.

Identification: Field signs

Species-specific field signs are not documented. The genus is relatively conspicuous, but specimens should be identified by a suitably qualified person.

Distribution: Known range

Published records place the species in the Wheatbelt, but exact collection sites and coordinates are not identified.

Parartemia contracta is reported from the southern Wheatbelt and adjacent parts of the northern Wheatbelt. A 2009 review described it as less common than some other Parartemia species.

Distribution: Western Australian status

The DBCA list identifies the Wheatbelt as the region flagged for this species. It is listed as Priority 1, described as poorly known and known from few locations, with none on conservation lands. No national listing is recorded.

Distribution: Record limitations

Atlas of Living Australia records show no public Western Australian coordinates for this species. Individual lakes and other precise localities are not identified.

Habitat: Recorded habitat

Habitat information is limited, but P. contracta is acid tolerant and associated with naturally acidic salt lakes.

P. contracta is acid tolerant and inhabits naturally acidic salt lakes. Lake names and measured conditions for this species are not documented.

Habitat: Wider genus context

Most Parartemia species inhabit intermittent saline lakes. Some genus records are from permanent lakes or slow-flowing saline creeks, but these habitats have not been established for P. contracta.

Foraging habitat: Diet and feeding

The diet and feeding behaviour of P. contracta have not been documented.

Species-specific information on food, feeding method and feeding locations is not documented.

Foraging habitat: Site assessment

Do not infer the species' presence or feeding habitat from water appearance alone. Record the wetland features and conditions observed, and seek expert identification of any collected specimens.

Breeding habitat: Species information

Breeding biology and timing are poorly known for P. contracta.

Species-specific breeding habitat, season, reproductive output and development are not documented.

Breeding habitat: Genus context

Some Parartemia can produce live nauplii and have multiple generations during a filling event. This has not been confirmed for P. contracta.

Sheltering habitat: Resting stages

Species-specific sheltering sites are not documented. Genus-level information on resting cysts is relevant as a precaution, but has not been confirmed for this species.

Parartemia generally produce drought-resistant cysts, also described as resting eggs. These need a period of drying before they hatch.

Sheltering habitat: Dried wetland sediments

The location and persistence of P. contracta cysts are not established. Avoid disturbing wetland mud or sediment on the assumption that a dry lakebed is unoccupied.

Threats: Wetland change

The species is poorly known. Changes to saline wetland conditions are a concern for Parartemia, although the reasons for declines are not always clear.

A genus review links population losses in Wheatbelt wetlands with combinations of salinity change, falling pH and changes in water permanence. It also reports that some populations of P. contracta and other species are absent from lakes where they were previously recorded.

Threats: Potential pressures

Altered hydrology, unsuitable salinity at some stages, prolonged inundation, acidification and loss of a drying phase may cause Parartemia to disappear or fail to recolonise. These genus-level concerns have not been confirmed as impacts at particular P. contracta sites.

Threats: Conservation status

P. contracta is Priority 1 on the DBCA list dated 1 July 2025. No national listing is recorded.

Survey methodology: 1. Desktop assessment

Parartemia is relatively conspicuous and surveys are straightforward, but there is no species-specific survey protocol or seasonal window.

Check current DBCA priority fauna information, project records and available wetland surveys. Treat the published Wheatbelt range as broad context because precise sites and public coordinates are not identified.

Survey methodology: 2. Wetland inspection

Inspect relevant saline wetlands and record whether they are wet or dry, their visible condition and any signs of recent disturbance. As general practice for aquatic invertebrate surveys, use a suitable fine-mesh net or other approved sampling method in shallow water where safe and authorised.

Survey methodology: 3. Identification and records

Parartemia specimens can be preserved in alcohol, and even ad hoc collections can help improve distribution knowledge. Follow permit and project requirements, retain only authorised samples, and arrange expert identification and clear location records.

Survey methodology: 4. Sediment and survey limits

Hatching eggs from dried mud has been used to obtain distribution records. Consider this only where an authorised specialist survey is designed to do so. A brief visit or a dry wetland should not be treated as proof of absence.

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: Saline flats and salt pans

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

P. contracta is acid tolerant and inhabits naturally acidic salt lakes.

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: general

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

Water and wetland associations

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

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

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 checks

Plan works to identify and avoid saline wetlands and associated sediments that could support this poorly known species.

Review the footprint and access routes against mapped saline wetlands, drainage lines and known survey information. Seek advice from a qualified aquatic invertebrate ecologist where suitable wetland habitat may be affected.

Before habitat disturbance: 2. Pre-clearance survey

Arrange an appropriately timed wetland survey before disturbance where a potentially suitable site is present. A species-specific survey month is not established, so consult an ecologist about current water conditions and survey limitations.

Before habitat disturbance: 3. Work planning

Set out avoidance areas and clear access boundaries before machinery enters the site. Assess whether the works could alter water movement, wetland levels, salinity or acidity, rather than considering only direct removal of habitat.

During habitat disturbance: 1. Protect avoidance areas

Use precautionary controls around wetlands and their catchments, and pause work if unexpected aquatic invertebrates or wetland conditions are encountered.

Keep vehicles, stockpiles and unnecessary foot traffic out of designated saline wetland areas and their margins. Maintain the agreed work boundary and prevent sediment or drainage from entering wetlands.

During habitat disturbance: 2. Control hydrological effects

Avoid unapproved changes to drainage, water levels or the flow of water into and out of wetlands. Manage dust, spills and construction runoff so they do not reach saline wetland water or sediments.

During habitat disturbance: 3. Respond to discoveries

If brine shrimp or other unexpected aquatic invertebrates are found in the work area, pause the relevant activity, protect the immediate area and contact the project ecologist. Do not handle or relocate animals unless authorised.

After habitat disturbance: 1. Inspect the site

After works, check that controls have held and that wetland condition and water pathways have not been unintentionally altered.

Check avoidance areas, wetland margins and drainage controls for vehicle access, sediment deposition, spills or other damage. Record observations and report any unexpected impacts promptly.

After habitat disturbance: 2. Follow up

Where a wetland was potentially affected, ask the project ecologist whether follow-up inspection or aquatic invertebrate survey is appropriate. A species-specific monitoring interval is not established.

Rehabilitation actions: 1. Restore disturbed areas

Rehabilitation should protect wetland function and avoid new changes to water regime or sediment conditions.

Stabilise disturbed ground and manage erosion so sediment does not enter saline wetlands. Use site-appropriate methods agreed with the project ecologist and relevant authorities.

Rehabilitation actions: 2. Protect wetland processes

Do not assume that making a wetland permanently wet, changing its drainage or altering sediment chemistry will benefit the species. Changes to water permanence, salinity and acidity are possible concerns for Parartemia.

Rehabilitation actions: 3. Verify outcomes

Inspect rehabilitation areas for erosion and unintended water flow changes. If the works affected a potentially suitable wetland, seek specialist advice on whether further survey is needed.

Sources