Long-spored aquatic hyphomycete
Anguillospora longissima
Anguillospora longissima is a widespread aquatic hyphomycete primarily found in clean, well-aerated running waters. It colonizes submerged, decaying leaf litter from deciduous trees and plays a crucial role in the decomposition of organic matter. Through the enzymatic conditioning of the leaves, it makes them more nutritious for macroinvertebrates such as gammarids. Its characteristic long and curved conidia are a morphological adaptation to the current, facilitating attachment to new substrates.
Details
Identification
Microscopically identifiable, filiform, and mostly s-shaped or sigmoid conidia with a length ranging from 150 to 350 µm.
Diet
Saprotrophic lifestyle; the fungus decomposes cellulose, hemicellulose, and lignin from submerged leaf litter.
Overwintering
Survival as mycelium within the substrate or through spore production even at low temperatures.
Ecology
Ecological role
Primary decomposer; converts terrestrial organic matter into aquatic biomass and conditions leaf litter for consumers.
Natural predators
Detritivorous macroinvertebrates (shredders) such as amphipods and larvae of stoneflies or caddisflies.
Competitor species
Other aquatic hyphomycetes such as Articulospora tetracladia or Tetrachaetum elegans.
Ecosystem service
Nutrient recycling, self-purification of water bodies, and providing the nutritional basis for the aquatic food web.
Threats
Eutrophication, chemical pollution (especially fungicides), acidification of water bodies, and loss of riparian woodlands.
Scientific profile
Profile
Distinguishing features
Characteristic are the very long, sigmoid (S-shaped) conidia, which can reach lengths of 150 to 350 µm. They are multi-septate and tapered at the base (Ingoldian fungi).
Habitat
Cool, well-aerated, mostly oligotrophic to mesotrophic streams and rivers with existing riparian vegetation.
Reproduction
Asexual reproduction through the production of macroscopically invisible conidia (mitosporic stages).
Protection & threats
Status not on standard scale
Main threats
Water pollution, eutrophication (nitrogen/phosphorus input), acidification, loss of riparian vegetation, and climate change.
Conservation measures
Protection and restoration of running waters, preservation of riparian buffer zones with native deciduous trees, reduction of fertilizer runoff.