Abundance and variability of microorganisms and transparent exopolymer particles across the ice–water interface of melting first-year sea ice in the Laptev Sea (Arctic)
Abundance and variability of microorganisms and transparent exopolymer particles across the ice–water interface of melting first-year sea ice in the Laptev Sea (Arctic)
复制标题
拉普捷夫海（北极）融化的第一年海冰的冰水界面上微生物和透明外聚合物颗粒的丰度和变异性
DOI：
10.1007/s002270000396
复制
发表时间：
2001
期刊：
影响因子：
2.4
通讯作者：
A. Engel
中科院分区：
文献类型：
--
作者：
C. Krembs;A. Engel
摘要1995年7月至9月，在拉普捷夫海浮冰层内和浮冰层下测定了透明外聚合物颗粒（TEP）的分布和丰度。从最低10厘米的浮冰和冰水界面以下10厘米处收集样品。测定了细菌、原生生物和TEP的丰度，并用温度、盐度和分子粘性剪切力表征了海冰-水边界层。TEP具有明显的尺寸分布信号，在海冰内部浓度最高，范围从无法检测到16 cm 2 l−1（中位数：2.9 cm 2 l−1）。在水中，浓度低一个数量级，范围从低于检测到2.7 cm 2 l−1（中位数：0.2 cm 2 l−1），并在8月中旬后下降，而自养鞭毛虫（AF），硅藻，异养鞭毛虫（HF）和纤毛虫的丰度增加。TEP在所有样品中的丰度均随其粒径的增大而减小，呈幂律关系。海冰和海水中TEP与微生物群落的关系不同，海冰中TEP与细菌和硅藻正相关，海水中TEP与HF负相关。密度跃层的存在显着影响生物丰度、硅藻组成和TEP浓度。冰内以冷菱形藻为主的羽状硅藻最为丰富。虽然细菌有可能产生外聚合物（EPS），本研究的结果表明，大多数TEP在第一年的北极夏季浮冰的冰水界面是由硅藻。
Abstract The distribution and abundance of transparent exopolymer particles (TEP) was determined in and below pack ice of the Laptev Sea from July to September 1995. Samples were collected from the lowermost 10 cm of ice floes and at 10 cm below the ice–water interface. Abundance of bacteria, protists and TEP was determined, and the sea ice–water boundary layer was characterized using temperature, salinity and molecular viscous shear stress. TEP, with a distinct size distribution signal, were found in highest concentrations inside the sea ice, ranging from not detectable to 16 cm2 l−1 (median: 2.9 cm2 l−1). In the water, concentrations were one order of magnitude lower, ranged from below detection to 2.7 cm2 l−1 (median: 0.2 cm2 l−1) and decreased after the middle of August, whereas abundances of autotrophic flagellates (AF), diatoms, heterotrophic flagellates (HF) and ciliates increased. The abundance of TEP decreased with its size in all samples following a power law relationship. The relation of TEP to the microbial community differed between the sea ice and water, being positively correlated with bacteria and diatoms in the ice and negatively correlated with HF in the sea water. The presence of a pycnocline significantly influenced the abundance of organisms, diatom composition and TEP concentrations. Pennate diatoms dominated by Nitzschia frigida were most abundant inside the ice. Though bacteria have the potential to produce exopolymeric substances (EPS), the results of this study indicate that the majority of TEP at the ice–water interface in first-year Arctic summer pack ice are produced by diatoms.