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Heterocapsa Mitsunori Iwataki Univ Tokyo, Japan Heterocapsa - PowerPoint PPT Presentation

Oct 09, 2023 •495 likes •688 views

Heterocapsa Mitsunori Iwataki Univ Tokyo, Japan Heterocapsa circularisquama Heterocapsa circularisquama - Armored dinoflagellate. - Forming red tides responsible to mass mortality of bivalves. - Forming temporary cyst, but resting cyst

  1. Heterocapsa Mitsunori Iwataki Univ Tokyo, Japan

  2. Heterocapsa circularisquama Heterocapsa circularisquama - Armored dinoflagellate. - Forming red tides responsible to mass mortality of bivalves. - Forming temporary cyst, but resting cyst unknown. Temporary cyst

  3. Cell shape of Heterocapsa spp. Cell shape of Heterocapsa spp. Cell shapes are resembling each other H. lanceolata H. arctica H. rotundata H. triquetra H. circularisquama H. pygmaea H. niei H. horiguchii H. pseudotriquetra H. orientalis

  4. Cell shape of Heterocapsa spp. Cell shape of Heterocapsa spp. H. rotundata H. lanceolata H. arctica H. triquetra H. niei H. pygmaea H. horiguchii H. circularisquama 10µm H. illdefina H. orientalis H. pseudotriquetra H. ovata

  5. Body scales of Heterocapsa spp. Body scales of Heterocapsa spp. Organic body scale is tiny, cell covering of Heterocapsa

  6. Body scales of Heterocapsa spp. Body scales of Heterocapsa spp. H. circularisquama H. illdefina H. niei H. arctica H. pygmaea H. triquetra H. lanceolata H. rotundata H. orientalis H. horiguchii H. ovata H. pseudotriquetra

  7. Occurrences of H. circularisquama in Japan Occurrences of H. circularisquama in Japan Obama Bay 1997 〜 Maizuru Bay 1998 〜 Lake Hamana 1993 〜 Hiroshima Bay 1995 〜 Suo-nada 1997 〜 Fukuoka Bay Gokasho Bay Ago Bay Uchinoumi 1998 〜 1994 〜 1992 〜 1998 〜 Imari Bay 1995 〜 Buzen Sea Uranouchi Bay 1997 〜 1988 〜 Omura Bay 1995 〜 Kusuura Bay 1994 〜 Motile cell Temporary cyst

  8. Occurrences of H. circularisquama in Japan Occurrences of H. circularisquama in Japan Bivalves mass mortality responsible species H. circularisquama was suddenly occurred in western Japanese coast in 1989. Red tides killing only bivalves have not been reported in Japan. Optimum temperature for growth of H. circularisquama is relatively high (30˚C). Original distribution of H. circularisquama is the tropical or subtropical?

  9. Heterocapsa blooms in Hong Kong (1986-1987) Heterocapsa blooms in Hong Kong (1986-1987) Tolo Harbour （湾奥部） 114˚00’ 114˚15’ Dapeng Bay Tai Po Kau (1986.9) 22˚45’ Tolo Harbour New Territories Yung Shue Au (1987.7) Kowloon Hong Kong 22˚30’ Lantau Island Island South China Sea

  10. LM and FM of Heterocapsa in Hong Kong LM and FM of Heterocapsa in Hong Kong Po 1’ 2’ 5’ cp 2” 1” 6” 7” as 1”’ 5”’ ps 1”” 2”” 2a - Cells are ellipsoidal - 16-30 µm long - Pyrenoid in the hypotheca - Nucleus in the epitheca - Thecal plate arrangement; Po, cp, 5’, 3a, 7”, 6c, 5s, 5”’, 2”” (= Heterocapsa )

  11. Body scales of Heterocapsa in HK (TEM) Body scales of Heterocapsa in HK (TEM) Body scale ultrastructure is identical to H. circularisquama

  12. LM and FM of Heterocapsa in Hong Kong LM and FM of Heterocapsa in Hong Kong H. circularisquama has distributed in Hong Kong (1986-1987) before the first occurrence in Japan (1988-). Hiroshima Bay 1995 〜 Ago Bay 1992 〜 Uranouchi Bay 1988 〜 Heterocapsa circularisquama ？ Hong Kong 1986-1987

  13. Phylogenetic tree of Heterocapsa (ITS region) Phylogenetic tree of Heterocapsa (ITS region) Prorocentrum micans Prorocentrum triestinum 69 Prorocentrum minimum Heterocapsa illdefina Heterocapsa ovata 71 Heterocapsa horiguchii 100 100 Heterocapsa horiguchii Heterocapsa triquetra 100 Heterocapsa triquetra Heterocapsa 100 100 Heterocapsa triquetra 75 Heterocapsa pseudotriquetra Heterocapsa pygmaea 100 Heterocapsa pygmaea Heterocapsa arctica 96 Heterocapsa rotundata 99 Heterocapsa lanceolata Heterocapsa circularisquama Obama Bay Heterocapsa Heterocapsa circularisquama Buzen Sea circularisquama Heterocapsa circularisquama Obama Bay Heterocapsa circularisquama Uranouchi Bay Heterocapsa circularisquama Obama Bay 100 Heterocapsa circularisquama Ago Bay

  14. H. circularisquama from Cuba? H. circularisquama from Cuba? A.R. Moreira González (Harmful Algae News 41)

  15. Harmful effects Harmful effects Matsuyama 2003, Bull. Fish. Res. Agen. Kim et al. 2000, Biosci. Biotechnol. Biochem.

  16. Summary Summary - Ultrastructure of body scales is useful to distinguish Heterocapsa spp., which are superficially similar to each other under light microscopy. - In Japan, distribution of H. circularisquama is expanding since the first occurrence in 1988. Before the year, red tide of this species was confirmed in Hong Kong, suggesting recent immigration of this species to Japan. - H. circularisquama gives harmful effects not only to bivalves, but also to rotifers, gastropods, ascidians, jellyfishes, protozoans and other dinoflagellates.

  17. Future study Future study - Other location in SE Asia. - Original distribution of H. circularisquama ? - Identification of toxic substances

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