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- W1509122580 abstract "Field studies in the Upper Gulf of Thailand and Manila Bay on red tides of green Noctiluca scintillans with the photo- synthetic symbiont Pedinomonas noctilucae showed that vertical maximum of N. scintillans often occurred below halocline at 10 to 15 meter depths, suggesting that salinity influenced the vertical distribution of this organism. Then, we examined the influence of salinity on the vertical distribution of N. scintillans under laboratory conditions. A three layer system with varying salinity of 10, 20 and 31 was produced in the black polyethylene tubes of 20 cm in diameter and 1.5 m long. Tubes were exposed to a 12 : 12 LD cycle under the light intensity of 70 mmol m �2 s �1 provided at the top. Two set of experiments were conducted to observe be- haviors of N. scintillans for a week: in the first set N. scintillans cells were added at the surface of the tubes while in the second one cells were added at the bottom. In the stratified tubes, all cells released at the surface died immediately at the beginning of the experiment, while cells released at the bottom slowly migrated toward the upper layer, and uniformly distributed through- out the column within 24 h. In the control tubes with a uniform salinity of 28, it took shorter (3 h) for cells released from the bot- tom to attain the uniform distribution. During the latter half of the experiment most cells stayed at the surface. These results in- dicate that N. scintillans is able to tolerate a wide range of salinity, and that an acclimation period is needed to adapt to low salinity conditions; this adaptive feature may be an important factor to maintain its population and to form red tide in the river mouth areas." @default.
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- W1509122580 date "2012-03-20" @default.
- W1509122580 modified "2023-09-25" @default.
- W1509122580 title "Effect of salinity on vertical migration of green Noctiluca under laboratory conditions" @default.
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