Seasonal changes in microbial biomass in the first-year ice of the Terre Adélie area (Antarctica)
Seasonal changes in microbial biomass in the first-year ice of the Terre Adélie area (Antarctica)
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阿德利地区（南极洲）第一年冰中微生物生物量的季节性变化
DOI：
10.3354/ame028257
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发表时间：
2002
影响因子：
1.4
通讯作者：
C. Plessis
中科院分区：
文献类型：
--
作者：
D. Delille;M. Fiala;J. Kuparinen;H. Kuosa;C. Plessis
南极洲Dumont d' urville站（66°40' S, 140°01' E）附近的沿海海冰支持着多种微生物群落。为了研究冰覆盖期间细菌、微藻和原生动物生物量的季节变化，对阿德利岛大陆架的速冻冰进行了调查。在1997年4月至12月期间，一个参考站每月抽样两次。在海冰形成期间的4、5月，地下冰的自养生物量达到了相对较高的水平，在400 ~ 800 mgC m -3之间。第二次增加发生在初夏的底部冰层，在12月中旬达到1500 mgC m -3。5月份细菌生物量为200毫克/立方米/立方米。细菌生物量的最高水平是在冰形成和夏季融化之前检测到的。从5月到7月，总原生动物生物量增加。7月表层冰层原生动物生物量最大（31.8 mgC m -3）。除短时间（5月下旬至6月上旬）外，以纤毛虫为主，占总原生动物生物量的50 ~ 77%。在冰封期，光养生物量一直占主导地位。微藻生物量平均占总生物量的80.6%，而细菌和原生动物生物量分别仅占16.4%和3%。尽管它们的生物量很低，但原生动物似乎在细菌调节中起着重要作用。
The coastal sea ice in the vicinity of Dumont d'Urville station, Antarctica (66° 40' S, 140° 01' E) supports a diverse microbial community. To investigate seasonal changes in bacterial, microalgal and protozoan biomass during the ice-coverage period, a survey was conducted on fast ice in the continental shelf of Terre Adelie. A reference station was sampled twice a month from April to December 1997. In April and May, during sea ice formation, the autotrophic biomass reached rela- tively high levels ranging from 400 to 800 mgC m -3 in the subsurface ice. A second increase reach- ing 1500 mgC m -3 in mid-December occurred in early summer in the bottom ice layer. Bacterial bio- mass ranged from 200 mgC m -3 in May. Maximal levels of bacterial biomass were detected during ice formation and just before the summer thaw. Total pro- tozoan biomass increased from May to July. Maximum protozoan biomass (31.8 mgC m -3 ) occurred in the surface ice layer in July. Except for during a short period (late May to early June), ciliates were dominant, accounting for 50 to 77% of the total protozoan biomass. During the ice-covered period, phototrophic biomass was always dominant. Microalgal biomass contributed on average 80.6% of total biomass whereas bacterial and protozoan biomass accounted for only 16.4 and 3%, respectively. Despite their low biomass, protozoa seem to play a major role in bacterial regulation.