4.4 Article

Effects of CO2 concentration on a late summer surface sea ice community

期刊

MARINE BIOLOGY
卷 164, 期 4, 页码 -

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s00227-017-3102-4

关键词

Sea ice algae; CO2; pH; Summer; Brine; Antarctica

资金

  1. Australian Antarctic Science Grants [AAS 4319]
  2. Victoria University of Wellington Grant [100241]

向作者/读者索取更多资源

Annual fast ice at Scott Base (Antarctica) in late summer contained a high biomass surface community of mixed phytoflagellates, dominated by the dinoflagellate, Polarella glacialis. At this time of the year, ice temperatures rise close to melting point and salinities drop to less than 20. At the same time, pH levels can rise above 9 and nutrients can become limiting. In January 2014, the sea ice microbial community from the top 30 cm of the ice was exposed to a gradient of pH and CO2 (5 treatments) that ranged from 8.87 to 7.12 and 5-215 mu mol CO2 kg(-1), respectively, and incubated in situ. While growth rates were reduced at the highest and lowest pH, the differences were not significant. Likewise, there were no significant differences in maximum quantum yield of PSII (F-v/F-m) or relative maximum electron transfer rates (rETR(max)) among treatments. In a parallel experiment, a CO2 gradient of 26-230 mu mol CO2 kg(-1) (5 treatments) was tested, keeping pH constant. In this experiment, growth rates increased by approximately 40% with increasing CO2, although differences among treatments were not significant.. As in the previous experiment, there was no significant response in F-v/F-m or rETR(max). A synchronous grazing dilution experiment found grazing rates to be inconclusive These results suggest that the summer sea ice brine communities were not limited by in situ CO2 concentrations and were not adversely affected by pH values down to 7.1.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.4
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据