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8 papers found.
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Survival time of juvenile pen shell Atrina pectinata (Bivalvia: Pinnidae) in hyposaline water

Survival time of juvenile pen shell Atrina pectinata (shell length ≈ 34 mm) exposed to hyposaline water without sediments was investigated in laboratory experiments. The bivalves were individually maintained in rearing cups in which salinity was decreased either gradually (over 1–11 h to 12 salinities ranging from 0 to ca. 34 ppt) or rapidly (directly to 21 salinities) at 12 and...

Temporal changes in the ciliate assemblage and consecutive estimates of their grazing effect during the course of a Heterocapsa circularisquama bloom

Temporal changes in ciliate assemblages during the course of a bloom of the harmful microalga Heterocapsa circularisquama (Dinophyceae) were investigated and consecutive estimates of species-specific maximum grazing losses were analyzed from August to September 1998 at a site in western Hiroshima Bay, the Seto Inland Sea of Japan. Temporal increases of the H. circularisquama mean...

Presence of the distinct systems responsible for superoxide anion and hydrogen peroxide generation in red tide phytoplankton Chattonella marina and Chattonella ovata

Raphidophycean flagellates, Chattonella marina and C. ovata, are harmful red tide phytoplankters; blooms of these phytoplankters often cause severe damage to fish farming. Previous studies have demonstrated that C. marina and C. ovata continuously produce reactive oxygen species (ROS) such as superoxide anion (O2−) hydrogen peroxide (H2O2) under normal growth conditions, and an...

Modern dinoflagellate cysts in hypertrophic coastal waters of Tokyo Bay, Japan

A survey of dinoflagellate resting cysts in surface sediment samples was carried out in Tokyo Bay, Japan, to document their horizontal distribution. At least 21 different cyst types were found. Dominant cyst types allowed the recognition of assemblages which form three different dinoflagellate cyst communities: the innermost part of the Bay, the central area and the mouth area...

Predation by a photosynthetic dinoflagellate Gyrodinium instriatum on loricated ciliates

Feeding of a naked photosynthetic dinoflagellate, Gyrodinium instriatum, on loricated ciliates was investigated. Gyrodinium instriatum preyed on Favella azorica and Eutintinnus tubulosus by engulfment through the posterior end of the sulcus. In the case of E.tubulosus, G.instriatum preyed on this small ciliate keeping the original gymnodinioid cell shape. On the other hand, G...

Effects of temperature, salinity and irradiance on the growth of the harmful red tide dinoflagellate Cochlodinium polykrikoides Margalef (Dinophyceae)

The effects of temperature, salinity and irradiance on the growth of the harmful red tide dinoflagellate Cochlodinium polykrikoides were examined in the laboratory. From 60 different combinations of temperature (10–30°C) and salinity (10–40) under saturated irradiance, C. polykrikoides exhibited its maximum specific growth rate of 0.41 day−1 at a combination of 25°C and salinity...

Effects of temperature and salinity on the growth of the red tide flagellates Heterocapsa circularisquama (Dinophyceae) and Chattonella verruculosa (Raphidophyceae)

Growth responses of the red tide flagellates, Heterocapsa circularisquama (Dinophyceae) and Chattonella verruculosa (Raphidophyceae), were examined with 36 different combinations of temperature (5–30°C) and salinity (10–35 PSU). Heterocapsa circularisquama did not grow at or below a temperature of 10°C. The maximum growth rate of H.circularisquama (1.3 divisions day−1) was...