First records of Amphidoma languida and Azadinium dexteroporum (Amphidomataceae, Dinophyceae) from the Irminger Sea off Iceland
|Author(s)||Tillmann Urban1, Gottschling Marc2, Nézan Elisabeth3, Krock Bernd1|
|Affiliation(s)||1 : Alfred Wegener Institute, Am Handelshafen 12, D-27570 Bremerhaven, Germany
2 : Department Biologie, Systematische Botanik und Mykologie, GeoBio-Center, Ludwig-Maximilians-Universität München, Menzinger Straße 67, D-80638 München, Germany
3 : Ifremer, Station de Biologie Marine, Place de la Croix, BP 40537, 29185 Concarneau Cedex, France
|Source||Marine Biodiversity Records (1755-2672) (Cambridge University Press (CUP)), 2015 , Vol. 8 , N. e142 , P. 11p.|
|Keyword(s)||Azadinium, Amphidoma, azaspiracids, Irminger Sea|
Species of dinophycean Amphidomataceae are producers of phycotoxins classified as azaspiracids. We provide the first records of two of their constituent species, Amphidoma languida and Azadinium dexteroporum, for the Irminger Sea off Iceland. Morphological examination and molecular characterization, including uncorrected mean pairwise distances between sequences of the Internal Transcribed Spacer (ITS), doubtlessly assigned the sub-Arctic strain 2A11 to the reference of Amphidoma languida. Strain 2A11 produced AZA-38 and AZA-39, corresponding to the toxin profile described for the type material. The sub-Arctic isolate 1D12 differed significantly in terms of ITS genetic distance (p = 0.04) from a Mediterranean Azadinium dexteroporum strain, but our morphological analysis did not reveal any major or stable diagnostic traits between the reference strain of Azadinium dexteroporum and the new strain described here. In contrast to the Mediterranean strain of Azadinium dexteroporum, the sub-Arctic strain 1D12 did not produce any known azaspiracids. The new records of Amphidoma languida and Azadinium dexteroporum from the Irminger Sea imply an important range extension of the species, formerly known from the northern and eastern Atlantic (Amphidoma languida) and from the Mediterranean area (Azadinium dexteroporum) only. Together with three new species of Azadinium recently described from the same expedition, the results clearly show that the biodiversity of the Amphidomataceae in the sub-Arctic is remarkably large.