摘要
从1988年5月～1989年1月,对东南极维斯特福尔德丘陵地区,戴维斯考察站沿海海域水体中的溶解游离型氨基酸的含量进行了长期连续测定。结果表明,在该海域海水中溶解游离型氨基酸的总浓度略高于其他海海域、浓度变化范围在19～302nmol/dm^3之间。最大丰度出现在11月份,而从11月下旬开始氨基酸含量急剧下降,至12月底达到全年最低点,从1月初开始有所回升。 占据南极夏初海水中海藻类主导地位的海藻Phaeocystis Pouchetii,其爆发性的繁殖过程从11月底开始至翌年1月底2月初结束,高峰在1月初。在Phaeocystis Pouchetii繁殖期,溶解游离型氨基酸浓度的降低与海藻细胞数量的增加有明显的负相关关系。作者认为在Phaeocystis Pouchetii繁殖增长过程中,该藻细胞直接摄取或(和)通过附随着藻类本体迅速增长的细菌群摄取溶解游离型氨基酸。
Water samples were collected, over a nine months period beginning in May 1988, from eleven depths in an 80m water column 10km off shore from Davis station, Antarctica. The samples were analysised for Dissolved Free Amino Acids (DFAAs) by HPLC used pre-column OPA derivatisation.
The variation of concentration of total DFAAs were between 19nmol/dm3 and 302 nmol / dm3 during the year and the highest concentration was occurred in 23 November. The annual bloom of the prymnesiophyte alga Phaeocystis Pouchetii occurred, associted with the bloom, the concentration of Dimethyl Sulfide and Acrylic acid were rising in December.
However, the concentration of DFAAs was declining with bloom of Phaeocystis Pouchetii. It is suggested that the growth of Phaeocystis Pouchetii, either by direct uptake and/ or indirectly by uptake from the associated quickly growth bacterial populations, reduced the DFAAs concentration to lower level.
出处
《南极研究》
CSCD
1990年第4期45-49,共5页
关键词
海藻
繁殖
海水
氨基酸
含量
Amino acid, Phaeocystis Pouchetii, sea area near Davis Station.
