The IUCN Species Survival Commission (SSC) launched a new Specialist Group in October 2023: the Aquatic Fungi Specialist Group, focusing on both freshwater and marine fungi. This group developed from FUNACTION, which was funded through Biodiversa+ (funaction.eu). The new Specialist Group will develop the scientific and coordination basis for conservation assessment, planning and action for aquatic fungi, and disseminate appropriate monitoring and assessment methods to practitioners, researchers and conservationists. Aquatic fungi are a polyphyletic group defined by their ecology (growing and reproducing mainly in the sea or freshwater). They belong mainly to the phyla Ascomycota, Basidiomycota, Chytridiomycota and Microsporidia, but include representatives of 13 phyla.
There is limited knowledge of the diversity and distribution of aquatic fungi and of any threats to them. Threats in aquatic environments in general are habitat decline, pollution, eutrophication, invasive species, ocean acidification, freshwater salinization, river regulation and climate change. These are also likely to be threats to aquatic fungi, but few researchers are working on the ecology and conservation of this polyphyletic group.
There are more than 5,700 known species of aquatic fungi, with > 3,800 freshwater species and c. 1,900 marine species, but these numbers are likely to be underestimates. Existing taxonomic and distribution data are in non-integrated databases and, unlike terrestrial fungi, no aquatic fungus has yet received a conservation assessment.
The Aquatic Fungi Specialist Group will collaborate with other fungi Specialist Groups and the IUCN SSC Fungal Conservation Committee to adapt and develop conservation assessment methods and coordinate assessments of both freshwater and marine aquatic fungi. The Group will also collaborate with the IUCN SSC Freshwater and Marine Conservation Committees to focus on conservation planning for aquatic fungi, and undertake and inspire actions to conserve these species in the face of the multitude of threats affecting aquatic ecosystems. If you are an expert on aquatic fungi, please join us in this venture.