Amphibolis antarctica

Amphibolis antarctica has no known major threats. There may be some localized threat from human activities such as port and industrial development, pipelines, communication cables, mining and dredging.

Cockburn Sound, an area in the range of Amphibolis antarctica, has been subjected to steady degradation since 1954, with the establishment of an oil refinery and the successive establishments of steel works, fertilizer factories, sewage-treatment facilities, and a power station. This has lead to contaminated effluents and increased nutrient loads in the surrounding waters. Between 1954 and 1978 the seagrass meadow in this region decreased from 4,200 to 900 ha and leaf detritus production was reduced from 23,000 to 4,000 t (dry weight)/year. Seagrasses in this region include Posidonia sinuosa, P. australis, P. coriacea, Halophila ovalis, H. decipiens, Syringodium isoetifolium, Zostera tasmanica, Amphibolis griffithii, and A. antarctica (Cambridge and McComb 1984).

Amphibolis antarctica is protected in some Marine Protected Areas within Western Australia. It occurs in the Shark Bay World Heritage Area which contains more than 4,000 km² of seagrass beds of high density. It is also protected in the Australian Fisheries Act and Marine Park Act.