WoRMS source details

John, U.; Litaker, R. W.; Montresor, M.; Murray, S.; Brosnahan, M. L.; Anderson, D. M. (2014). Formal revision of the Alexandrium tamarense species complex (Dinophyceae) taxonomy: The introduction of five species with emphasis on molecular-based (rDNA) cassification. Protist. 165(6): 779-804.
195631
10.1016/j.protis.2014.10.001 [view]
John, U.; Litaker, R. W.; Montresor, M.; Murray, S.; Brosnahan, M. L.; Anderson, D. M.
2014
Formal revision of the <i>Alexandrium tamarense</i> species complex (Dinophyceae) taxonomy: The introduction of five species with emphasis on molecular-based (rDNA) cassification
Protist
165(6): 779-804
Publication
The Alexandrium tamarense species complex is one of the most studied marine dinoflagellate groups due to its ecological, toxicological and economic importance. Several members of this complex produce saxitoxin and its congeners - potent neurotoxins that cause paralytic shellfish poisoning. Isolates from this complex are assigned to A. tamarense, A. fundyense, or A. catenella based on two main morphological characters: the ability to form chains and the presence/absence of a ventral pore between Plates 1' and 4'. However, studies have shown that these characters are not consistent and/or distinctive. Further, phylogenies based on multiple regions in the rDNA operon indicate that the sequences from morphologically indistinguishable isolates partition into five clades. These clades were initially named based on their presumed geographic distribution, but recently were renamed as Groups I-V following the discovery of sympatry among some groups. In this study we present data on morphology, ITS/5.8S genetic distances, ITS2 compensatory base changes, mating incompatibilities, toxicity, the sxtA toxin synthesis gene, and rDNA phylogenies. All results were consistent with each group representing a distinct cryptic species. Accordingly, the groups were assigned species names as follows: Group I, A. fundyense; Group II, A. mediterraneum; Group III, A. tamarense; Group IV, A. pacificum; Group V, A. australiense.
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2015-01-27 07:37:57Z
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2021-11-18 12:22:59Z
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 Description

Cells are as long as wide or slightly longer then wide; 35 ± 3.15 μm (min 30 μm, max 40 μm, n = 20) wide and 35 ... [details]

 Description

Ellipsoidal resting cysts, with a granular dark brown content and surrounded by a mucous layer. [details]

 Description

Cells are as wide as long or slightly wider than high. In exponentially growing culture, cells of ACPP01 are 34.3 ... [details]

 Harmful effect

According to John et al. (2014), one strain, ATNWB01, was toxic with a toxin profile that included GTX5, STX,C1,2 ... [details]

 Harmful effect

For a discussion of the species in the tamarense group, see under A. catenella. John et al. (2014) have suggested ... [details]

 Identification

This species, belonging to the Alexandrium tamarense species complex, can only be unambiguously identified using ... [details]

 Identification

Based on studies of ribosomal genes, species of the so-called tamarense group fall into 5 groups. It has been ... [details]

 Identification

This species, belonging to the Alexandrium tamarense species complex, can only be unambiguously identified using ... [details]