MEPS 337:303-309 (2007)  -  doi:10.3354/meps337303

Appearance of Dinophysis fortii following blooms of certain cryptophyte species

Kazuhiko Koike1,3,*, Asami Nishiyama1, Kiyotaka Takishita2, Atsushi Kobiyama1, Takehiko Ogata1

1Kitasato University, School of Fisheries Sciences, 160-4 Aza-Uhoh, Okirai, Sanriku, Ofunato, Iwate 022-0101, Japan
2Japan Agency for Marine-Earth Science and Technology, Extremobiosphere Research Center, Research Program for Marine Biology and Ecology, 2-15 Natsushima, Yokosuka, Kanagawa, 237-0061, Japan
3Present address: Hiroshima University, Graduate School of Biosphere Science, 1–4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739–8528, Japan

ABSTRACT: We examined the possibility that dinoflagellates belonging to genus Dinophysis acquire plastids from certain species of cryptophytes. We measured the abundance of cryptophytes over a 3 yr period in Okkirai Bay, northern Japan by fluorescent in situ hybridization (FISH), using an oligonucleotide probe that specifically binds to the Dinophysis plastid small subunit ribosomal RNA. A high density of FISH-probed cryptophytes always occurred prior to peak occurrences of D. fortii, although the density of FISH-probed cryptophytes did not correlate well with the density of D. fortii. Although further investigation is needed, monitoring of these cryptophyte species may be useful for predicting Dinophysis growth and subsequent outbreaks of diarrheic shellfish poisoning.

KEY WORDS: Dinophysis · Diarrheic shellfish poisoning · Cryptophyte · Teleaulax · Fluorescent in situ hybridization

Full text in pdf format