Our understanding of ice algal responses to the recent changes in Arctic sea ice is impeded by limited field observations. In the present study, environmental characteristics of the landfast sea-ice zone as well as primary production and macromolecular composition of ice algae and phytoplankton were studied in the Kitikmeot Sea near Cambridge Bay in spring 2017. Averaged total chlorophyll-a (Chl-a) concentration was within the lower range reported previously for the same region, while daily carbon uptake rates of bottom-ice algae were significantly lower in this study than previously reported for the Arctic. Based on various indicators, the region's low nutrient concentrations appear to limit carbon uptake rates and associated accumulation of bottom-ice algal biomass. Furthermore, the lipids-dominant biochemical composition of bottom-ice algae suggests strong nutrient limitation relative to the distinctly different carbohydrates-dominant composition of phytoplankton. Together, the results confirm strong nitrate limitation of the local marine system.

中文翻译：

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加拿大迪斯海峡剑桥湾底冰藻和浮游植物的碳氮吸收率和大分子组成

我们对冰藻对北极海冰最近变化的反应的理解受到有限的实地观察的阻碍。本研究于 2017 年春季在剑桥湾附近的 Kitikmeot 海研究了陆固海冰区的环境特征以及冰藻和浮游植物的初级生产和大分子组成。平均总叶绿素-一种（氯-一种) 浓度在先前报告的同一地区的较低范围内，而本研究中底冰藻的每日碳吸收率明显低于先前报告的北极。根据各种指标，该地区的低营养浓度似乎限制了碳吸收率和底冰藻类生物量的相关积累。此外，底冰藻类以脂质为主的生化成分表明，相对于浮游植物以碳水化合物为主的明显不同的成分，养分受到了强烈的限制。总之，这些结果证实了当地海洋系统对硝酸盐的强烈限制。