Biogeochemical and ecological variability during the late summer–early autumn transition at an ice‐floe drift station in the Central Arctic Ocean
Biogeochemical and ecological variability during the late summer–early autumn transition at an ice‐floe drift station in the Central Arctic Ocean
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北冰洋中部浮冰漂移站夏末初秋过渡期间的生物地球化学和生态变化
DOI：
10.1002/lno.11676
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发表时间：
2020
影响因子：
4.5
通讯作者：
DiTullio, Giacomo R.
中科院分区：
文献类型：
--
作者：
Schanke, Nicole L.;Bolinesi, Francesco;Mangoni, Olga;Katlein, Christian;Anhaus, Philipp;Hoppmann, Mario;Lee, Peter A.;DiTullio, Giacomo R.
随着北极夏季冰盖的逐年减少，该地区可能会发生相应的地球化学和生态变化。由于北冰洋中部通常是营养和光照有限，这是至关重要的，以了解环境变化将如何影响生产力，浮游植物物种组成，并在该地区的生物地球化学随之发生的变化。从夏末到初秋的过渡期间，沿沿着北极附近的浮冰漂移站进行了各种地球化学参数的水柱采样。结果表明，在夏末秋初过渡期，随着上层水体分层减弱，营养盐浓度、颗粒二甲基磺基丙酸盐（DMSPp）水平、光合效率和生物生产力（ΔO2/Ar比值）均下降。对浮游植物色素的化学分类学（CHEMTAX）分析揭示了一个分类学上多样的微微自养群落，其中含有叶绿素（Chl）c3的鞭毛虫和prasinophyte，Pyramimonasspp.，作为最丰富的群体，分别占总Chla（TChla）生物量的约30%和20%。与以前的研究相反，picoprasinophyte，Micromonasspp.，仅占TClabiomass的5%至10%。在已鉴定的9个分类群中，DMSPp与Pyramimonasspp.关系最密切，a通常不被认为是高DMSP生产者的含Chlb的物种。随着北冰洋中部开放无冰沃茨的范围和持续时间逐渐增加，我们认为增强的光透射可能会扩大Pyramimonasspp的生态位。本地区
As the annual expanse of Arctic summer ice‐cover steadily decreases, concomitant biogeochemical and ecological changes in this region are likely to occur. Because the Central Arctic Ocean is often nutrient and light limited, it is essential to understand how environmental changes will affect productivity, phytoplankton species composition, and ensuing changes in biogeochemistry in the region. During the transition from late summer to early autumn, water column sampling of various biogeochemical parameters was conducted along an ice‐floe drift station near the North Pole. Our results show that as the upper water column stratification weakened during the late summer–early autumn transition, nutrient concentrations, particulate dimethylsulfoniopropionate (DMSPp) levels, photosynthetic efficiency, and biological productivity, as estimated by ΔO2/Ar ratios, all decreased. Chemotaxonomic (CHEMTAX) analysis of phytoplankton pigments revealed a taxonomically diverse picoautotrophic community, with chlorophyll (Chl)c3‐containing flagellates and the prasinophyte,Pyramimonasspp., as the most abundant groups, comprising ~ 30% and 20% of the total Chla(TChla) biomass, respectively. In contrast to previous studies, the picoprasinophyte,Micromonasspp., represented only 5% to 10% of the TChlabiomass. Of the nine taxonomic groups identified, DMSPpwas most closely associated withPyramimonasspp., a Chlb‐containing species not usually considered a high DMSP producer. As the extent and duration of open, ice‐free waters in the Central Arctic Ocean progressively increases, we suggest that enhanced light transmission could potentially expand the ecological niche ofPyramimonasspp. in the region.
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