The adaptation of Arctic phytoplankton to low light and salinity in Kongsfjorden (Spitsbergen)  

作　　者：CUI Shikai HE Jianfeng HE Peimin ZHANG Fang LIN Ling MA Yuxin 

机构地区：[1]College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China [2]SOA Key Laboratory for Polar Science, Polar Research Institute Of China, Shanghai 200136, China [3]College of Environmental Science and Engineering, Tongji Univeristy, Shanghai 200092, China

出　　处：《Advances in Polar Science》2012年第1期19-24,共6页极地科学进展（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant nos. 41076130, 40576002);the Youth Marine Science Foundation of SOA (Grant no. 2010116)

摘　　要：The basic environmental variables and adaptability ofphytoplankton communities to low light and salinity were stud- ied using incubation experiments in Kongsfjorden, a high Arctic fjord of Spitsbergen, in late summer 2006. Chlorophyll a concentrations were steady or decreased slightly in darkness after one day or one week incubation. Chlorophyll a concentrations showed an initial decline when exposed to natural light after one week incubation in darkness, and then increased significantly. In a salinity experiment, the maximal growth rate was observed at a dilution ratio of 10%, however, higher dilution ratios （≥0%） had an obvious negative effect on phytoplankton growth. We suggest that the phytoplankton communities in fjords in late summer are dark- ness adapted, and the inflow of glacial melt water is favorable for phytoplankton growth in the outer fiords where the influence of freshwater is limited.The basic environmental variables and adaptability ofphytoplankton communities to low light and salinity were stud- ied using incubation experiments in Kongsfjorden, a high Arctic fjord of Spitsbergen, in late summer 2006. Chlorophyll a concentrations were steady or decreased slightly in darkness after one day or one week incubation. Chlorophyll a concentrations showed an initial decline when exposed to natural light after one week incubation in darkness, and then increased significantly. In a salinity experiment, the maximal growth rate was observed at a dilution ratio of 10%, however, higher dilution ratios （≥0%） had an obvious negative effect on phytoplankton growth. We suggest that the phytoplankton communities in fjords in late summer are dark- ness adapted, and the inflow of glacial melt water is favorable for phytoplankton growth in the outer fiords where the influence of freshwater is limited.

关 键 词：PHYTOPLANKTON light SALINITY KONGSFJORDEN ARCTIC 

分 类 号：P731.11[天文地球—海洋科学] TV697.25[水利工程—水利水电工程]