MarionIsland_ChrisOosthuizen (130)
A wandering albatross pair at Marion Island.
(Chris Oosthuizen)
The division of forestry, fisheries and setting has confirmed the presence of the excessive pathogenicity avian influenza (HPAI) H5N1 virus on South Africa’s sub-Antarctic territory of Marion Island.
Samples collected from September to December final 12 months have been shipped again to mainland South Africa on the SA Agulhas II in February this 12 months, based on the division. In March, polymerase chain response testing confirmed an infection in six chook species: the wandering albatross, king penguin, brown skua, southern large petrel, northern large petrel and the sooty albatross.
“Following an preliminary suspected HPAI case in a brown skua at Marion Island — a chook displaying scientific indicators of HPAI an infection together with twitching and tremors — in mid-September 2024, extra comparable instances have been reported in early November and mortalities in a number of species have continued into March 2025, although the general loss of life fee slowed considerably in January,” it stated.
The division famous that the diminished mortality fee is “promising”. However 31 chook species breed on Marion Island and since the chook species and age composition varies all year long, “it’s troublesome to foretell how the outbreak will progress”.
The potential results on marine mammals are additionally of concern however no elevated mortality has been reported in any mammal species to this point.
Among the many wandering albatrosses, chicks have been principally affected with no less than 150 of about 1 900 from the 2024 cohort having died. In different species adults have been worse affected: no less than 80 grownup brown skuas and about 120 grownup king penguins. A lot smaller numbers of affected large petrels — no less than 20 southern and 4 northern — and 5 sooty albatrosses have been noticed.
“The deaths of grownup seabirds are of higher concern than chicks, as a result of most species begin to breed from three to 10 years of age, and most affected species elevate at most one chick per 12 months,” the division stated, noting that there are additionally a large number of different threats to seabirds, together with fisheries bycatch, local weather change, plastic air pollution and predation by launched home mice on Marion Island.
Marion Island, together with neighbouring Prince Edward Island, gives crucial breeding and moulting grounds for thousands and thousands of seabirds and marine mammals, together with almost half of the world’s wandering albatrosses, lots of of 1000’s of penguins, and huge numbers of southern elephant seals and sub-Antarctic and Antarctic fur seals.
The archipelago is positioned within the south western Indian Ocean, about 2 000km southeast of Cape City and midway between Africa and Antarctica.
Observations of and laboratory check outcomes for HPAI (H5N1) on Marion Island can help in inferring the potential danger to animals on Prince Edward Island as a result of they share varied ecological traits.
Visits to Prince Edward Island are restricted to at least one go to each 4 years to protect its pristine state. The final survey was undertaken in November 2023.
Having unfold all over the world since 2021, HPAI (H5N1) was detected in seabirds and marine mammals in South Georgia, southeast of South America, in October 2023.
It reached the Antarctic Peninsula in February 2024 and was detected on the French archipelagos of Crozet and Kerguelen (950km and 2300km east of Marion, respectively) in October and November 2024. The virus will be transported lengthy distances by migrating birds, and the virus moved from South Georgia to the French islands.
“The state of affairs on Marion Island is being intently monitored by the sphere personnel overwintering on the island, who’ve been educated to recognise potential HPAI indicators in birds and seals and within the needed monitoring and mitigation strategies,” the division stated.
“They are going to proceed to take all precautions to make sure they don’t unfold the virus. There are few different illness mitigation instruments out there in this sort of state of affairs.
“The HPAI protocol that has been carried out on Marion Island was developed by the division, the administration authority for the Prince Edward Islands, along with Western Cape veterinary companies, marine ornithologists, marine mammal biologists, illness specialists and colleagues abroad with comparable expertise,” the division stated.
Efforts to observe and to hopefully restrict the unfold of the virus on the island would proceed.