Amphibolis griffithii

Amphibolis griffithii 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. Seagrass losses may be attributed to dredging of the Fremantle Port Authority shipping channel, shell-sand dredging, eutrophication, and movement of large sand sheets (Kendrick et al. 2000).

Cockburn Sound, an area in the range of Amphibolis griffithii, 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, Posidonia australis, Posidonia coriacea, Halophila ovalis, Halophila decipiens, Syringodium isoetifolium, Zostera tasmanica, Amphibolis griffithii, and Amphibolis antarctica (Cambridge and McComb 1984).

Amphibolis griffithii is protected in some marine protected areas within Western Australia. It is protected in the Australian Fisheries Act and Marine Park Act.