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- Title
THE INVASIVE GENUSASPARAGOPSIS(BONNEMAISONIACEAE, RHODOPHYTA): MOLECULAR SYSTEMATICS, MORPHOLOGY, AND ECOPHYSIOLOGY OFFALKENBERGIAISOLATES.
- Authors
Chualáin, Fionnuala Ní; Maggs, Christine A.; Saunders, Gary W.; Guiry, Michael D.
- Abstract
The genusAsparagopsiswas studied using 25Falkenbergiatetrasporophyte strains collected worldwide. Plastid (cp) DNA RFLP revealed three groups of isolates, which differed in their small subunit rRNA gene sequences, temperature responses, and tetrasporophytic morphology (cell sizes). Strains from Australia, Chile, San Diego, and Atlantic and Mediterranean Europe were identifiable asA. armataHarvey, the gametophyte of which has distinctive barbed spines. This species is believed to be endemic to cold-temperate waters of Australia and New Zealand and was introduced into Europe in the 1920s. All isolates showed identical cpDNA RFLPs, consistent with a recent introduction from Australia.Asparagopsis taxiformis(Delile) Trevisan, the type and only other recognized species, which lacks spines, is cosmopolitan in warm-temperate to tropical waters. Two clades differed morphologically and ecophysiologically and in the future could be recognized as sibling species or subspecies. A Pacific/Italian clade had 4–8° C lower survival minima and included a genetically distinct apomictic isolate from Western Australia that corresponded to the form ofA. taxiformisoriginally described asA. sanfordianaHarvey. The second clade, from the Caribbean and the Canaries, is stenothermal (subtropical to tropical) with some ecotypic variation. The genusAsparagopsisconsists of two or possibly three species, but a definitive taxonomic treatment of the twoA. taxiformisclades requires study of field-collected gametophytes.
- Subjects
ASPARAGUS densiflorus; CANARIES; NUCLEIC acids; GENES; DNA; BONES
- Publication
Journal of Phycology, 2004, Vol 40, Issue 6, p1112
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.1529-8817.2004.03135.x