Algal Parasite Herpodiscus durvillaeae (Phaeophyceae: Sphacelariales) Inferred to have Traversed the Pacific Ocean with its Buoyant Host

Researchers have discovered that the algal parasite Herpodiscus durvillaeae, previously known only from New Zealand, has traversed the Pacific Ocean, likely by rafting on its buoyant host, the southern bull-kelp (Durvillaea antarctica). Genetic analysis of samples from the Falkland Islands confirms the first record of this parasite in the Atlantic Ocean and reveals it is genetically indistinguishable from populations in New Zealand's sub-Antarctic Campbell Island. Additionally, the study reports H. durvillaeae infecting two other New Zealand endemic host species, Durvillaea poha and D. willana, expanding its known host range. The findings suggest recent trans-oceanic dispersal of this parasite, highlighting the role of buoyant macroalgae in facilitating long-distance movement.

Fraser, C. I., & Waters, J. M. (2012). Algal Parasite Herpodiscus durvillaeae (Phaeophyceae: Sphacelariales) Inferred to have Traversed the Pacific Ocean with its Buoyant Host. Journal of Phycology, 49(1), 202–206. Portico. https://doi.org/10.1111/jpy.12017