Harmful Algae News
An IOC Newsletter on Toxic Algae and Algal Blooms
No. 56 - March 2017 www.ioc-unesco.org/hab
Is Gambierdiscus expanding its
geographic range in the Pacific region?
Content
HAB events and toxin effects
Gambierdiscus distribution
in the Pacific . ................................... 1
Pseudo-nitzschia toxins and
copepods ........................................... 5
Alexandrium spp. in British
Columbia, Canada .......................... 7
Raphidophytes from British
Columbia . .......................................... 9
Algal blooms in the Gulf
of Oman . ............................................ 11
HAB monitoring
The Scottish Coastal
Observatory . .................................... 15
Fig. 1. Top, macroalgae in lagoonal waters, Rarotonga, Cook Islands, from where Gambi-
erdiscus sp. CAWD233 was isolated, and bottom, Phoebe Argyle sampling from eel grass in
Tongatapu, Kingdom of Tonga.
The genus Gambierdiscus is known
from tropical regions world-wide 1-4.
Species in this genus produce ciguatox-
ins (CTXs) and/or maitotoxins (MTX),
which are regarded as the causative
agents of ciguatera fish poisoning (CFP)
1-4. At the beginning of 2017, fourteen
species of Gambierdiscus had been de-
scribed 5-6 with three of these being
described in 2016, an increase of nearly
30 in one year. The newly described
species were G. balechii, G. cheloniae
and G. lapillus 7-9. Over the past few
years, species which were previously
only known in the Caribbean have been
recorded in the Pacific 3, although this
could be due to the greater research ef-
fort in recent years rather than due to
introductions. Currently only G. caro-
linianus 6, G. excentricus and G. silvae
10 have not been detected in the Pa-
cific region (Table 1).
Recently, genetically and morpho-
logically identical isolates from as far
apart as the Kermadec Islands (a New
Zealand territory), the Cook Islands
(Fig. 1) and the Kingdom of Tonga were
determined to be unique. These iso-
lates are maintained in the Cawthron
Institute Culture Collection of Micro
algae (CAWD242 (Fig. 2), CAWD233
and CAWD250 respectively) and the de-
scription is currently in review. Identi-
cal DNA sequence data to this currently
undescribed species have also been
recorded for an isolate from eastern
Australia, although the isolate did not
survive 2. If accepted as a new species
HAN Networking
The RedFAN network in
Mexico . ............................................... 16
Ciguatera risk management
for the IOCARIBE Region ............ 17
HAB research at the IOC/
WESTPAC region ............................ 18
In memoriam: Paul Harrison .... 20
Forthcoming events
6 th IPSAP Congress ........................ 10
GlobalHAB SSC ................................ 19
ICES-IOC WGHABD . ...................... 19
13 Session of the IOC-IPHAB...... 19
11th ICMSS in Galway .................. 21
DINO 11 in Bordeaux ................... 22
Mycotoxins & Phycotoxins ......... 22
SAHFOS Course on Phyto-
plankton Taxonomy ...................... 23
IOC Course on Harmful
Algae Identification and
Quantification . ................................ 23
Ciguatera session at the
10 IPFC ............................................... 23
New!
Taxonomy note . .............................. 24
Oceanography Special Issue
on Int. HAB Cooperation . ........... 24
Harmful Algae News An IOC Newsletter on Toxic Algae and Algal Blooms No. 56 - March 2017 www.ioc-unesco.org/hab Is Gambierdiscus expanding its geographic range in the Pacific region? Content HAB events and toxin effects Gambierdiscus distribution in the Pacific . ...................................
Table 1: Geographic occurrence and toxin production (as determined by LCMS/MS) of Gambierdiscus species in the Pacific region. Species reported in the Pacific region G. australes G. balechii G. belizeanus G. caribaeus G. carpenteri G. cheloniae G. lapillus G. pacificus G. polynesiensis G. scabrosus
Fig. 2. Scanning electron micrographs of cells of Gambierdiscus sp., isolate CAWD242, from the Kermadec Islands: (A) view of cingulum and apical pore, (B) apical pore complex, (C) antapi- cal hypotheca. this will bring the number of Gambier- discus species to fifteen. A related species, originally d
lished data). The role of MTXs in ciguat- era fish poisoning is uncertain and due to its low oral toxicity may only play a small part in toxic events 21. A range of cell-based assays is avail- able to detect CFP-related toxins, includ- ing receptor binding (RBA), Ca 2+ flux, N2A and haemolytic assay
Toxin production in lab-rat-diatoms (e.g. Pseudo-nitzschia) in the presence of copepods From only 15 species in 1965, currently 49 Pseudo-nitzschia species have been described, of which 22 have the abil- ity to produce the toxin domoic acid (DA), along with two Nitzschia species 1. Both numbers are
Apart from increasing toxin produc- tion in already toxic species/strains, presence of grazers may even induce toxin production in species previously considered non-toxic, as shown for P. obtusa 3. It is therefore relevant to consider that all Pseudo-nitzschia spe- cies might have the potential to p
Ecology of Alexandrium spp. in the Strait of Georgia, British Columbia, Canada 2015 Fig. 1 Citizen Science sampling stations in the Strait of Georgia, Canada in 2015. Fig. 2. Citizen Science sampling areas in the Strait of Georgia, Canada in 2015. Coastal waters of British Columbia (BC), Canada have
Table 1. Number of water samples (N) collected by the Citizen Science Program, frequency of samples with Alexandrium spp. presence (Alex. +), and number of water samples with Alexan- drium spp. cells present by month, Strait of Georgia 2015 (n/a - no samples were collected). Area Ladysmith Cowichan
A clarification of three unnamed raphidophytes previously described from British Columbia gated motile cell with very similar chlo- roplasts and the oval Lugol-fixed cell in Fig. 2 #3 were probably equivalent to the long cells formed by V. globosus in stationary growth (see 5 Figs. 7 & 8). Raphidoph
Fig. 3. Raphidophyte 2 from a culture in 1974. Motile cell, ventral view 11.5 μm long. reproduced here at a smaller size (Fig. 4) and are interpreted (in the figure caption) by the author. Photographs of motile cells under stress received from Nicky Haigh (Mi- crothalassia) (not shown here) reveal t
Autumnal algal bloom succession in northern coasts of Gulf of Oman Fig. 1. Map of the study area The composition of harmful algal blooms is determined by the diversity and abundance of different species pre- sent. Temporal fluctuations in phyto- plankton populations can lead to a suc- cession of dif
Table 1. Maximal mean density of the observed bloom species and physical-chemical properties of the near-shore waters during autumnal algal blooms in the northern Gulf of Oman Date 26 October 2016 04 November 2016 09 November 2016 29 November 2016 03 December 2016 Species/ Genus Alexandrium sp. Pror
Nodularin accumulation in New Zealand shortfin eel from Lake Forsyth/Te Wairewa in 1866 2 and, from the 1940s onwards, open- ings have been carried out regularly. In 2008, the rūnanga attempted to create a permanent opening by constructing a 900 m canal and 300 m groyne at the eastern end of the bea
Fig. 2. Nodularia spumigena from Lake Forsyth/Te Wairewa at 400 magnification (A) and blooms of the cyanobacterium at the lake in 2006 (B). Fig. 3. Eel fishing channels at Lake Forsyth/Te Wairewa (A) and members of the rūnanga of Wairewa catching eels in the channels by gaffing (B; photo provided by
The Scottish Coastal Observatory Scotlands coastal environment is sub- ject to inherent variability resulting from short term processes such as tides and weather, the seasonal cycle, multi- annual cycles such as the North Atlantic Oscillation and larger scale influences such as climate change and oc
The RedFANnetwork: a working group to deal with HABs in Mexico In October 2014 the network RedFAN (from the acronym in Spanish: Red temática sobre Florecimientos Algales Nocivos) was created with the financial support of the Mexican National Coun- cil of Science and Technology (CONA- CyT). This netw
Caribbean Ciguatera Experts Discuss a Risk Management System for the IOCARIBE Region Over the past three decades the inci- dence of ciguatera has increased in the Caribbean countries by about 32 1. Despite the evidence of toxic events and their potential consequences on public health, fisheries and
IOC/WESTPAC Scientists Shape the Future of Regional HAB Research More than twenty experts from coun- tries in the Western Pacific gathered in Nha Trang, Vietnam, 19-22 December 2016 to foster cooperation and define research priorities for Harmful Algal Blooms (HABs) in the region (Fig. 1). The East
ing the ongoing HAB research and ca- pacity building efforts at these levels. Dr. Po Teen Lim presented the science and implementation plans of the IOC- SCOR sponsored new GlobalHAB re- search program (Fig. 3). It was widely recognized that national and regional efforts are complementary to global e
In memory of Paul Harrison With great sorrow, we learned of the recent unexpected passing of our col- league, mentor and friend Paul J. Har- rison. Among his many contributions, Paul was a founding member of the Sci- entific Committee on Oceanic Research (SCOR) working Group 137 SCOR WG 137 Global
supply, marine resources, climate change impacts and environmental protection. His voice and perspec- tive will be sorely absent. Paul will be greatly missed by those he touched, but especially by Victoria, his wife of 51 years, and their children Rachel, Richard and Christina. A scholarship fund th
11th International Conference on Modern and Fossil Dinoflagellates The University of Bordeaux (France) is the organiser of the 11 th International Conference on Modern and Fossil Dino- flagellates, DINO11, which will be held from 17 to 21 July 2017 at Bordeaux, France. This series of conference was
IOC Qualifications in Identification and Enumeration of Harmful Marine Microalgae A now traditional IOC course on identi- fication of harmful marine microalgae, including optional workshops on enu- meration and culture techniques. The 2017 course will be held from 6 to 19 August at the IOC Science a
Taxonomic Note Oceanography special issue Alexandrium catenella vs. A. fundyense The Nomenclature Committee for Algae has decided (Prudhomme van Reine, 2017) that the name Gonyaulax catenel- la (Alexandrium catenella) should not be rejected and that A. fundyense and A. catenella are conspecific havi