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First records of Amphidoma languida and Azadinium dexteroporum (Amphidomataceae, Dinophyceae) from the Irminger Sea off Iceland

Published online by Cambridge University Press:  02 October 2015

Urban Tillmann ,
Marc Gottschling ,
Elisabeth Nézan  and
Bernd Krock
Urban Tillmann*
Affiliation:
Alfred Wegener Institute, Am Handelshafen 12, D-27570 Bremerhaven, Germany
Marc Gottschling
Affiliation:
Department Biologie, Systematische Botanik und Mykologie, GeoBio-Center, Ludwig-Maximilians-Universität München, Menzinger Straße 67, D-80638 München, Germany
Elisabeth Nézan
Affiliation:
Ifremer, Station de Biologie Marine, Place de la Croix, BP 40537, 29185 Concarneau Cedex, France
Bernd Krock
Affiliation:
Alfred Wegener Institute, Am Handelshafen 12, D-27570 Bremerhaven, Germany
*
Correspondence should be addressed to: U. Tillmann, Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, D-27570 Bremerhaven, Germany email: [email protected]
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Abstract

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.

Keywords

AzadiniumAmphidomaazaspiracidsIrminger Sea
Type
Research Article
Information
Marine Biodiversity Records , Volume 8 , 2015 , e142
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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