Document ID: chunk:federal_register_of_legislation:F2025L00287:reg:3:p127
Version: federal_register_of_legislation:F2025L00287
Segment Type: reg
Provision Reference: reg 3 (pt 127/276)
Character Range: 504614–508804

indicating that the population was recovering from the dry period. Based on 2022 surveys, the population size has now grown to 350 individuals over an area of 0.7ha.
The distribution is shown in Map 15.

Ecology
Live-bearing.

Habitat
Litter and woodland (Smith 1992), living under logs.

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. Drying conditions and lower soil moisture balances due to climate change are also a threat.

Impact on other species
None known.
Map 15 Distribution of Advena suteri
Green outlines indicate reserves within which the species occurs. Points show recorded locations (Hyman & Kohler 2020).

Risk assessment
The risk assessment is shown in Table 40.
Table 40 Risk assessment for Advena suteri
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                                              Possible (26–50%)         Moderate     Medium
6. Predation by rodents                                                                                            Likely (51–90%)           Extreme      Extreme
7. Predation by cats                                                                                               Rare (0–10%)              Negligible   Negligible
8. Predation or damage by chickens                                                                                 Almost certain (91–100%)  Major        Extreme
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                                      Likely (51–90%)           Moderate     Medium

Management actions
Restore native vegetation, control introduced weeds and animals (chickens, rodents). Target control of rodents in areas where there are known snail populations to reduce predation pressure. Remove weeds (especially red guava) from important areas for snails to restore suitable pH and moisture levels. Expansion of suitable native vegetation and experimental addition of woody debris to increase the number of shelter sites for the species. Conduct further surveys to determine the full extent of existing populations.
If warranted, reinitiate captive breeding and return individuals to appropriate managed sites on Norfolk Island (ensuring exclusion of rodents and chickens).

Recovery target
The recovery target is shown in Table 41.
Table 41 Recovery target for Advena suteri
EPBC Act status        Estimated population (2023)  Where known populations occur  2034 target