Published by China Ocean Press. Response of Arctic marine microalgae to changes of sal inity 3

• Main Authors: Zhang Qing, Rolf Gradinger, Zhou Qingsong, Zeng Jiangning
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2000
• Subjects: Arctic; Greenland; Greenland Sea; ice algae; Sea ice
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.600.9953; http://www.sio.org.cn/lamb/papers/paper14.pdf

Abstract ———An algal assemblage collected from the bottom of floe in the Greenland Sea was batchcul2 tured at 1 ±1 ℃and 10 salinity gradients varied from 410 to 9018 for 19 d. The growth for both the al2 gal community and individual populations was characterized by an initial lag phase of six days followed by positive growth. Maximum growth rates were obtained as 0119 / d for the algal community and 0132 to 0139 d- 1 for individual populations for the whole experiment period, which mostly occurred at the lower salinities. The competition between the algal species and the evolution of the algal assemblages under the salinity changes was checked. After 142d culture, the dominating algae in the lower salinities were cen2 tric diatoms, pennate diatoms and phytoflagellates, while ones in the higher salinities almost belonged to pennate diatoms. It is suggested that the sea ice algal community from the Greenland Sea prefer lower salinities to higher ones, and the decrease in salinity in small ranges could stimulate the growth of sea ice algae. Key words Arctic, sea ice, algal community, salinity IN TRODUCTION Micro2organisms that inhabit the interstices and underside of sea ice are exposed to wide variations of salinity, particularly during the periods of brine drainage and ice melting