温度和盐度对条纹环沟藻(Gyrodinium instriatum)生长的影响

Effects of temperature and salinity on growth of Gyrodinium instriatum

在实验室条件下,研究了温度和盐度对条纹环沟藻(Gyrodinium instriatum)生长的影响。在28个温度(15～30℃)和盐度(0～35)组合中,条纹环沟藻在20℃和盐度25下生长最好。适宜生长温度为20～25℃,盐度为20～25。在适宜的盐度下,藻细胞对高/低温度的忍耐能力增强,同样适宜温度也可促进藻细胞对高/低盐度的抵抗能力。条纹环沟藻不能在无盐环境生长,但在适温下(20～25℃),能在盐度为10的条件下生长。研究结果说明条纹环沟藻是一种广盐生物,能适应较低的盐度,这也是其赤潮多在低盐的河口海域发生的重要原因。

The effects of temperature and salinity on the growth of the red tide dinoflagellate G yrodinium instriatum were examined un- der the laboratory conditions. Exposed in 28 different combinations of temperature （ 15 -30 ℃ ） and salinity （ 0 - 35 ）, G. instriatum was exhibited the maximum growth at a combination of 20 ℃ and a salinity of 25. The optimum growth was observed at temperatures ranging from 20to25 ℃ and at salinities from 20 to 25. The resistance to low and high temperatures was increased under optimum sa- linity and vice versa. The organism could not grow at the salinity of 0 at all temperatures,but grew at the salinity of 10 at temperatures between 20 and 25 ℃ It is noteworthy that G. instriatum is an euryhaline organism and can live under low salinity. It might be the im- portant reason why its blooms generally occurred in the estuaries with low salinity.