Thecal plate morphology, molecular phylogeny, and toxin analyses reveal two novel species of Alexandrium (Dinophyceae) and their potential for toxin production
Document Type
Article
Publication Date
8-1-2023
Abstract
This study describes two novel species of marine dinophytes in the genus Alexandrium. Morphological characteristics and phylogenetic analyses support the placement of the new taxa, herein designated as Alexandrium limii sp. nov. and A. ogatae sp. nov. Alexandrium limii, a species closely related to A. taylorii, is distinguished by having a shorter 2'/4' suture length, narrower plates 1' and 6'', with larger length: width ratios, and by the position of the ventral pore (Vp). Alexandrium ogatae is distinguishable with its metasert plate 1' having almost parallel lateral margins, and by lacking a Vp. Production of paralytic shellfish toxins (PSTs), cycloimines, and goniodomins (GDs) in clonal cultures of A. ogatae, A. limii, and A. taylorii were examined analytically and the results showed that all strains contained GDs, with GDA as major variants (6-14 pg cell-1) for all strains except the Japanese strain of A. limii, which exclusively had a desmethyl variant of GDA (1.4-7.3 pg cell-1). None of the strains contained detectable levels of PSTs and cycloimines.
Keywords
Alexandrium, Goniodomins, Harmful algal bloom, ITS secondary structure, Paralytic shellfish toxins, Taxonomy, Thecal plates
Divisions
ocean
Funders
Ministry of Higher Education, Malaysia, Higher Institution Centers of Excellence Grant and Long-term Research Grant Scheme (LRGS) (HICoE IOES-2023B),Long-term Research Grant Scheme (LRGS) (UNI/F07/RISE/85756/2023),Universiti Malaysia Sarawak RISE award (LRGS/1/2020/UMT/01/1/3),PACES II research program of the Alfred-Wegener-Institute (AWI) as part of the Helmholtz Foundation initiative in Earth and Environment
Publication Title
Harmful Algae
Volume
127
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS