Document ID: chunk:federal_register_of_legislation:F2025L00287:reg:3:p123
Version: federal_register_of_legislation:F2025L00287
Segment Type: reg
Provision Reference: reg 3 (pt 123/276)
Character Range: 491948–496244

is shown in Map 14.

Ecology
Live-bearing.

Habitat
Litter and woodland (Smith 1992).

Threats
Major threats include habitat loss, fragmentation and degradation by land clearing and stock grazing, as well as the introduction of feral animals (notably rats) and invasive weeds. Predation by rodents and feral chickens remains a significant threat. Drying conditions and lower soil moisture balances due to climate change are also a threat.

Impact on other species
None known.
Map 14 Distribution of Advena grayi
Green outlines indicate reserves within which the species occurs. Points show recorded locations (Tweed 2023).

Risk assessment
The risk assessment is shown in Table 38.
Table 38 Risk assessment for Advena grayi
Risk                                                                                                               Likelihood of exposure    Consequence  Threat rating
1. Loss and fragmentation of native vegetation through past land clearing                                          Almost certain (91–100%)  Major        Extreme
2. Loss and fragmentation of native vegetation through current or future land clearing                             Unlikely (11–25%)         Major        Medium
3. Degradation of native vegetation through past grazing or loss of nutrients                                      Almost certain (91–100%)  Moderate     High
4. Degradation of native vegetation through current or future grazing                                              Unlikely (11–25%)         Moderate     Low
6. Predation by rodents                                                                                            Rare (0–10%)              Extreme      Medium
7. Predation by cats                                                                                               Rare (0–10%)              Negligible   Negligible
8. Predation or damage by chickens                                                                                 Rare (0–10%)              Major        Low
9. Predation by swamphens                                                                                          Rare (0–10%)              Negligible   Negligible
10. Predation by Argentine ant                                                                                     Rare (0–10%)              Negligible   Negligible
11. Competition from/change of habitat because of weed invasion                                                    Almost certain (91–100%)  Minor        Medium
12. Infection by pathogens already present                                                                         Unlikely (11–25%)         Minor        Low
13. Impacts of potential new invasive species or pathogens                                                         Unlikely (11–25%)         Moderate     Low
14. Changes to vegetation, increased fire risk and/or direct physiological stress as a result of climatic changes  Likely (51–90%)           Moderate     Medium
15. Problems caused by small populations, including lack of genetic diversity                                      Possible (26–50%)         Moderate     Medium

Management actions
Restore native forest habitat, control introduced weeds and predators (rodents, chickens), survey to determine the extent of existing populations and consider captive breeding.

Recovery target
The recovery target is shown in Table 39.
Table 39 Recovery target for Advena grayi
EPBC Act status        Estimated population (2023)  Where known populations occur  2034 target
Critically Endangered  5,000 (1 population)         100% within the national park  At least one large population on Phillip Island

Relevant literature
DEWHA (Department of the Environment, Water, Heritage and the Arts) (2008b) Approved Conservation Advice for Mathewsoconcha grayi ms (a snail). Department of the Environment, Water, Heritage and the Arts, Canberra.
Hyman I (2005) Taxonomy, systematic, and evolutionary trends in Helicarionida (Mollusca, Pulmonata). PhD Thesis, University of Sydney.
Hyman IT, Caiza J & Köhler F (2023) Systematic revision of the microcystid land snails endemic to Norfolk Island (Gastropoda: Stylommatophora) based on comparative morpho-anatomy and mitochondrial phylogenetics. Invertebrate Systematics 37(5–6), 334–443.