Bacterioplankton and picophytoplankton abundance, biomass, and distribution in the Western Canada Basin during summer 2008
Bacterioplankton and picophytoplankton abundance, biomass, and distribution in the Western Canada Basin during summer 2008
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2008 年夏季加拿大西部盆地的浮游细菌和微型浮游植物丰度、生物量和分布
DOI：
10.1016/j.dsr2.2012.08.018
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发表时间：
2012-12-15
影响因子：
3
通讯作者：
Chen, Jianfang
中科院分区：
文献类型：
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作者：
He, Jianfeng;Zhang, Fang;Chen, Jianfang
在2008年夏季“雪龙”号北极考察期间，对加拿大西部海盆浮游细菌和微微型浮游植物的丰度、生物量、空间分布及其与环境变量的关系进行了调查。在200 m以上的水柱中，浮游细菌和微微型浮游植物的丰度分别为0.17-8.38 × 10（5）cells ml（-1）和0.01-17.71 × 10（6）cells L-1。上层100 m水体中浮游细菌和微微型浮游植物的平均生物量分别为413.3和118.8 mg C m（-2）。浮游细菌和微微型浮游植物的生物量随纬度的增加而减少，主要分布在50 m以上。与东部样带相比，这是强烈的影响，太平洋水的流入，西部样带相对较低的温度，高盐度，高养分，高生物量。没有显着的关系之间的组合和水温或盐度检测，除了浮游细菌和盐度之间的纬向断面。然而，微微型浮游植物和营养盐之间的显着负相关和浮游细菌和微微型浮游植物之间的显着正相关。我们认为，这主要是由于相对较低的微微型浮游植物生物量，发生严重的分层（营养线），和次表层叶绿素最大值（SCM）在研究区。夏季海冰的大量融化增加了层化，阻碍了深层沃茨的营养补充，这可能会增加北极盆地地区上层水柱中微生物组合的作用。(C)2012爱思唯尔有限公司出版
During the R/V Xuelong Arctic cruise in summer 2008, we investigated bacterioplankton and picophytoplankton abundance, biomass, spatial distribution, and these variables' relationship with environmental variables in the Western Canada Basin. The bacterioplankton and picophytoplankton abundances in the upper 200 m of the water column were 0.17-8.38 x 10(5) cells ml(-1) and 0.01-17.71 x 10(6) cells L-1, respectively. The average integrated bacterioplankton and picophytoplankton biomasses in the upper 100 m of the water column were 413.3 and 118.8 mg C m(-2), respectively. Microbial biomass was comparable with previous reports and distributed mainly in the upper 50 m of the water column.The bacterioplankton and picophytoplankton biomasses decreased with increasing latitude. Compared with eastern transects, which were strongly influenced by an influx of Pacific water, the western transects had relatively low temperature, high salinity, high nutrients, and high biomass. No significant relationships were detected between assemblages and water temperature or salinity, expect for one between bacterioplankton and salinity in the latitudinal transects. However, a significant negative correlation between picophytoplankton and nutrients and a significant positive correlation between bacterioplankton and picophytoplankton were observed. We suggest that this was mainly caused by the relatively low picophytoplankton biomass, occurrence of heavy stratification (nutricline), and the subsurface chlorophyll maxima (SCM) in study area. Heavy melting of sea ice in summer increases the stratification, which obstructs nutrient supplementation from deep waters, and this might increase the role of microbial assemblages in the upper water column in the Arctic basin area. (C) 2012 Published by Elsevier Ltd.