Azaspiracids producing dinoflagellates
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1 Azaspiracids producing dinoflagellates Kazuya Takahashi and Mitsunori Iwataki Univ Tokyo, Japan
2 Azadinium spp. Found in 2009 as a producer of lipophilic polyether toxin Azaspiracids (AZAs), responsible for diarrhetic shellfish poisoning, which has been reported from northern Europe including Ireland, United Kingdom, Norway, Netherlands, France, Spain, Portugal and Italy. (Krock et al. 2009, Tillmann et al. 2011) New genus and new species, Azadinium spinosum were described for the organism in 2011, showing characteristic features including thecal plate arrangements Azadinium spinosum (Krock et al. 2009, Harmful Algae) and rdna phylogeny. (Tillmann et al. 2011) 10 species with 2 varieties were so far described in the genus. (Tillmann et al. 2014) Cells are generally small (7 18 µm), autotrophic, and occur in planktonic form. (Tillmann et al. 2014) Azadinium poporum (right: Tillmann et al. 2011, Eur. J. Phycol.)
3 Cell shape of Azadinium and Amphidoma Azadinium spinosum a (type species) A. obesum b A. poporum c A. caudatum var. margelefii d A. caudatum var. caudatum d A. polongum e A. dexteroporum f A. dalianense g A. trinitatum h A. cuneatum h A. concinnum h Amphidoma languida i a) Tillmann et al. 2009; b) Tillmann et al. 2010; c) Tillmann et al. 2011; d) Nézan et al. 2012; e) Tillmann et al. 2012b; f) Percopo et al. 2013; g) Luo et al. 2013; h) Tillmann et al. 2014; i) Tillmann et al. 2012a.
4 Species discrimination (Tillmann et al. 2014, Protist) a) Tillmann et al. 2009; b) Salas et al. 2011; c) Tillmann et al. 2012b; d) Tillmann et al. 2010; e) Tillmann et al. 2011; f) Potvin et al.2012; g) Gu et al. 2013b; h) Krock et al. 2012; i) Nézan et al. 2012; j) Tillmann et al. 2014b; k) Tillmann et al. 2012b; l) Percopo et al. 2013; m) Tillmann et al. (unpublished); n) Luo et al. 2013; o) Tillmann et al. 2014; p) Tillmann et al. 2012a.
5 Antapical spine (Tillmann et al. 2014, Protist) Azadinium spinosum (Tillmann et al. 2009) A. poporum (Tillmann et al. 2011) A. cuneatum (Tillmann et al. 2014) A. concinnum (Tillmann et al. 2014) a) Tillmann et al. 2009; b) Salas et al. 2011; c) Tillmann et al. 2012b; d) Tillmann et al. 2010; e) Tillmann et al. 2011; f) Potvin et al.2012; g) Gu et al. 2013b; h) Krock et al. 2012; i) Nézan et al. 2012; j) Tillmann et al. 2014b; k) Tillmann et al. 2012b; l) Percopo et al. 2013; m) Tillmann et al. (unpublished); n) Luo et al. 2013; o) Tillmann et al. 2014; p) Tillmann et al. 2012a.
6 Ventral pore position (Tillmann et al. 2014, Protist) A. spinosum (Tillmann et al. 2009) A. dexteroporum (Percopo et al. 2013) A. trinitatum (Tillmann et al. 2014) A. cuneatum (Tillmann et al. 2014) a) Tillmann et al. 2009; b) Salas et al. 2011; c) Tillmann et al. 2012b; d) Tillmann et al. 2010; e) Tillmann et al. 2011; f) Potvin et al.2012; g) Gu et al. 2013b; h) Krock et al. 2012; i) Nézan et al. 2012; j) Tillmann et al. 2014b; k) Tillmann et al. 2012b; l) Percopo et al. 2013; m) Tillmann et al. (unpublished); n) Luo et al. 2013; o) Tillmann et al. 2014; p) Tillmann et al. 2012a.
7 Cysts in Azadinium polongum Tillmann et al. 2012, Harmful Algae Resting cyst like cells were observed only in A. polongum. But germination from sediments was reported also in A. poporum and A. dalianense (Gu et al. 2013, Luo et al. 2013).
8 Toxicity of Azadinium and Amphidoma (Tillmann et al. 2014, Protist) Azadinium spinosum a AZA-1, -2, -716 A. obesum b A. poporum c A. caudatum AZA-2, -11, -36, var. margelefii d -37, -40, -41 A. caudatum var. caudatum d A. polongum e A. dexteroporum f AZA-3, -7 A. dalianense g A. trinitatum h A. cuneatum h A. concinnum h AZAs were detected in three Azadinium and one Amphidoma species. Amphidoma languida i AZA-816, -830 a) Tillmann et al. 2009, Salas et al. 2011, Tillmann et al. 2012b; b) Tillmann et al. 2010; c) Tillmann et al. 2011, Krock et al. 2014; d) Nézan et al. 2012; e) Tillmann et al. 2012b; f) Percopo et al. 2013, Tillmann et al. 2014; g) Luo et al. 2013; h) Tillmann et al. 2014; i) Tillmann et al. 2012a, Krock et al
9 Distribution in the Western Pacific A. poporum from Korea (Potvin et al. 2012, J. Eukaryot. Microbiol.) : A. poporum : A. dalianense (Potvin et al. 2012, Gu et al. 2013, Luo et al. 2013, Krock et al. 2014, Takahashi unpubl.) A. dalianense from China (Luo et al. 2013, Phycologia) Two species were observed from Korea, China, Vietnam and Japan.
10 ITS phylogeny of A. poporum ML analysis based on 689 positions Ribotype A: North Sea Ribotype B: Asia Ribotype C: Asia, Southwest Atlantic Ribotype D: Gulf of Mexico Takahashi, unpubl.
11 High variability of AZA profile in A. poporum Krock et al. 2014, Harmful Algae 3 strains did not contain AZAs, and 13 strains contained different combinations of AZAs.
12 What factor is related to AZA productibity in A. poporum? Krock et al. 2014, Harmful Algae No clear relationship among ribotype, biogeography, and AZA combination was seen.
13 Summary There are 10 described species in Azadinium, and closely related Amphidoma languida as potential producers of AZAs. Resting form is most likely present in A. polongum, A. poporum and A. dalianense. In Asia, two species A. poporum and A. dalianense were reported. In A. poporum, some strains did not contain AZAs, and some strains contain different combinations of AZAs.
14 Future study Are other Azadinium species distributed in Western Pacific? Azadinium species were mainly observed from Europe, but in Asia only two species were reported. Do Azadinium species produce resting cyst? Presence/absence of productivity, morphology, distribution of resting cysts in each species will estimate AZA risk in each locality of Asia. Do toxic species always produce AZAs? Do non-toxic species never produce AZAs? Analysis using different species and culture strains will help to clarify what factor (species, ribotype, biogeography) is related to AZA productivity.
15 Pinnatoxins producing dinoflagellates Kazuya Takahashi and Mitsunori Iwataki Univ Tokyo, Japan
16 Vulcanodinium rugosum Initially described as a new genus and new species in 2011 from Italy, and subsequently identified in the same year as a producer of cyclic imine toxin Pinnatoxin (PnTxs), using culture strains from Japan, New Zealand and South Australia. (Nezan et Chomerat 2011, Rhodes et al. 2011) PnTxs were first characterized in pen shell Pinna muricata from Japan in 1995, but were detected widely including New Zealand, Australia, Japan, Norway, Canada and Cook Islands. (Rhodes et al. 2011) Photosynthetic, armored and benthic species, and produces spherical immotile cells. (Nezan et Chomerat 2011) Nezan et Chomerat 2011, Cryptogamie, Algologie
17 Morphology and life history Zeng et al. 2012, New Zeal. J. Mar. Fresh.
18 Phylogeny Nezan et Chomerat 2011, Cryptogamie, Algologie
19 Recent reports from China, Florida and Qatar Frorida China Qatar Zeng et al. 2012, New Zeal. J. Mar. Fresh. Garrett et al. 2014, Harmful Algae Al Muftah et al. 2016, Toxicon
20 Genotypes and toxins in V. rugosum PnTxs A, E, F, G PnTxs E, F PnTxs H PnTxs G no toxins PnTxs H PnTxs G Al Muftah et al. 2016, Toxicon
21 Summary V. rugosum was identified as a source organisms of PnTxs. In culture strains, coccoid stage was dominant in the life history. V. rugosum strains established at the same time were identical in ribotypes and combination of PnTxs. In Asia, V. rugosum was reported from Japan and China.
22 Future study How is the distribution of this species in other areas? If present, which genotypes are classified to them? How the combination of PnTxs is defined? (genotypes, locations). PnTxs H was detected in the strain from Sourthern China, but more formerly other PnTxs were also reported in the environment near the place (Zeng et al. 2012).
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