At low tide, many tidepools can be seen in the intertidal rocky shores. It is not uncommon to see discoloured water in such pools especially in summer. Some of the blooms are caused by prasinophytes, such as Tetraselmis, but most of them are formed by dinoflagellates. Only limited number of species of dinoflagellates seem to form blooms in such environments. In Japan, we have found five species of dinoflagellates which can form blooms in the tide pools.
Rocky shore of Miura Peninsula, Kanagawa Pref., Japan. Environmental conditions of each pool is different depending on its height.
A brown-coloured bloom formed by a dinoflagellate.
Only five species have been found to form blooms in tide pools in Japan：Scrippsiella hexapraecingula, S. gregaria, Gymnodinium pyrenoidosum, Alexandrium hiranoi, Dinothrix paradoxa。
Scrippsiella hexapraecingula Horiguchi et Chihara
Scrippsiella gregaria (Lombard et Capon) Loeblich, Schmidt et Scherley
Alexandrium hiranoi Kita et Fukuyo
Gymnodinium pyrenoidosum Horiguchi et Chihara
Dinothrix paradoxa Pascher
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