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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
The dinoflagellate Alexandrium minutum in Cape Town harbour (South Africa): Bloom characteristics, phylogenetic analysis and toxin composition
Harmful Algae, Volume 6, No. 6, Year 2007
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Description
A novel bloom of Alexandrium minutum occurred in an inner basin of the Cape Town harbour from November 2003 to February 2004. Cellular concentrations reached a maximum of 1.4 × 108 cells l-1 during the mid-December period with corresponding chlorophyll a concentrations of 243 mg m-3. Primary productivity measurements conducted during the latter part of the bloom revealed a maximum assimilation number of 11.17 mg C mg Chl a-1 h-1 during the middle of the day. Productivity during this post-peak period was sustained largely by the reduced nitrogen species NH4 and urea (96%) as measured using 15N tracer techniques. The large subunit ribosomal DNA sequence of A. minutum isolates from Cape Town harbour was identical to conspecifics collected in Western Europe and in Australia. The composition of tetrahydropurine neurotoxins associated with paralytic shellfish poisoning (PSP) was limited to gonyautoxins (GTX1-GTX4). This profile combined with evidence of a low toxin cell quota (1.5 fmol GTX cell-1) supports a close association of this taxon with other members of the A. minutum species complex, particularly from Europe. Toxin analysis from black mussels collected during this bloom indicated that the accumulated PSP toxins originated from A. minutum and not from Alexandrium catenella as is most often the case along the South African coast. © 2007 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Pitcher, Grant C.
South Africa, Cape Town
Marine and Coastal Management
Cembella, Allan Douglas
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Joyce, Linda B.
South Africa, Cape Town
Marine and Coastal Management
Larsen, J.
Denmark, Kobenhavn
Bot.inst.
Probyn, Trevor A.
South Africa, Cape Town
Marine and Coastal Management
Ruiz Sebastian, Carlos
South Africa, Cape Town
University of Cape Town
Statistics
Citations: 58
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1016/j.hal.2007.04.008
ISSN:
15689883
Research Areas
Cancer
Genetics And Genomics
Study Locations
South Africa