Document ID: chunk:federal_register_of_legislation:F2025L00287:reg:3:p198
Version: federal_register_of_legislation:F2025L00287
Segment Type: reg
Provision Reference: reg 3 (pt 198/276)
Character Range: 729945–733569

Negligible   Negligible
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                                                    Possible (26–50%)         Moderate     Medium
12. Infection by pathogens already present                                                                         Unlikely (11–25%)         Moderate     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%)           Major        High
15. Problems caused by small populations, including lack of genetic diversity                                      Almost certain (91–100%)  Moderate     High

Management actions
This orchid may require development of species-specific conservation actions, including ex situ conservation. Undertake targeted weed control and maintenance around host trees, and habitat protection and rehabilitation. Undertake research into the ecology of the species.
Monitor/survey likely areas of the national park after storms, rescue any fallen specimens and attempt to cultivate them in the Norfolk Island National Park Nursery (Sykes & Atkinson 1988).

Recovery target
The recovery target is shown in Table 86.
Table 86 Recovery target for Dendrobium brachypus
EPBC Act status  Estimated population (2023)  Where known populations occur  2034 target
Endangered       200                          100% in the national park      No decline

Relevant literature
Orchard A (ed) (1994) Flora of Australia. Vol. 49. Oceanic Islands 1. Australian Government Publishing Service, Canberra.
Sykes W & Atkinson I (1988) Rare and Endangered Plants of Norfolk Island. Unpublished report to the Australian National Parks and Wildlife Service, Norfolk Island.
TSSC (Threatened Species Scientific Committee) (2003c) Commonwealth Listing Advice for Norfolk Island Flora – 16 Endangered Species.

Dysoxylum bijugum—sharkwood
Family MELIACEAE

Conservation significance
Australian distribution is restricted to Norfolk Island but also occurs in New Caledonia and Vanuatu (TSSC 2003b).
EPBC Act Listing Status: Vulnerable.

Description
A tree growing to 7m with yellow flowers and a strong fetid or garlic-like smell when bruised.

Distribution and abundance
The Norfolk Island population of Dysoxylum bijugum consisted of 870 mature individuals in 2003 (TSSC 2003b) with about 90% of the population occurring in the national park. It also occurs in the Mission Road rainforest fragments, at Steeles Point and in Anson Reserve, Selwyn Reserve and Two Chimneys Reserve. There are pockets in the south-east and west of the national park where this species is the dominant tree. In these areas there are many small seedlings. On Phillip Island, this species has been planted in the upper part of Long Valley (Mills 2009b). The 2021 population estimate was 940 individuals and is considered stable.
The distribution is shown in Map 35.

Habitat
Grows in moist upland hardwood forest, pine-hardwood ridge forest and plateau hardwood forest (Invasive Species Council & TierraMar 2021).

Ecology
Little known.

Threats
D. bijugum is threatened by cattle grazing and weed