• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Ocean acidification effects on haploid and diploid Emiliania huxleyi strains: Why changes in cell size matter
【24h】

Ocean acidification effects on haploid and diploid Emiliania huxleyi strains: Why changes in cell size matter

机译：海洋酸化对单倍体和二倍体Emiliania huxleyi菌株的影响：为什么细胞大小变化很重要

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effects of ocean acidification (OA) on Emiliania huxleyi non-calcifying haploid strain CCMP 374 (s374) and calcifying diploid strain CCMP 2668 (s2668) were investigated in this study. Both E. huxleyi strains were cultured semi-continuously for similar to 20 generations under three pCO(2) levels, one representing equilibrium with contemporary atmospheric pCO(2) and two representing different OA scenarios projected for the end the century. During the course of the experiments, measurements were made for cell size in s374 and coccosphere size in strain s2668, cellular intrinsic growth rates, and the per cell (s374) and per coccosphere (52668) concentrations of particulate organic carbon (POC) and nitrogen (PON), particulate inorganic carbon (PIC), chlorophyll a (chl a) and particulate dimethylsulfoniopropionate (DMSPp). In agreement with other studies, elevated pCO(2) led to a small increase in POC and PON in the diploid strain, but not in the haploid strain. Although the PIC was static across pCO(2) treatments in the diploid calcifier, PIC:POC was reduced under OA due to the disproportionate increase in POC. The concentration of E. huxleyi DMSPp cell(-1) increased (s2668) or responded non-linearly (s374) to OA. Exposure to OA caused cell and coccosphere volumes to increase by 18% and 37% from the ambient to high pCO(2) treatment in the haploid and diploid strain, respectively, despite equivalent cross-treatment growth rates. Therefore, when normalized to cell and coccosphere volume, small to negligible increases in cellular constituents under OA translated into decreased cellular and coccosphere densities (e.g. mass vol(-1)) of those same constituents. This produces seemingly contradictory cellular responses to OA depending on data normalization, and highlights the need to cautiously interpret OA experimental data when cell and coccosphere size is not reported. A consistent OA-induced increase in cell and coccosphere size has implications for E. huxleyi cellular physiology, ecology and trophic interactions, as cell size is a master characteristic that governs cellular rate processes, predator encounter rates, and predator ingestion efficiencies. Further, because POC and PON did not scale with volume increases, there is a dilution in the carbon and nitrogen concentration in E. huxleyi cells under OA. This result could have cascading effects on planktonic food webs as predator ingestion rates and growth efficiencies adjust. (C) 2016 Elsevier B.V. All rights reserved.
机译：在这项研究中，研究了海洋酸化（OA）对Em草非钙化单倍体菌株CCMP 374（s374）和钙化二倍体菌株CCMP 2668（s2668）的影响。两种大肠杆菌均在三个pCO（2）水平下半连续培养约20代，其中一个代表与现代大气pCO（2）的平衡，另外两个代表本世纪末预计的不同OA方案。在实验过程中，对s374中的细胞大小和菌株s2668中的球囊大小，细胞固有生长速率以及每细胞（s374）和每球囊（52668）的颗粒有机碳（POC）和氮的浓度进行了测量。 （PON），颗粒状无机碳（PIC），叶绿素a（chla）和颗粒状二甲基磺丙酸二甲酯（DMSPp）。与其他研究一致，pCO（2）升高导致二倍体菌株中POC和PON的少量增加，而单倍体菌株中则没有。尽管PIC在二倍体钙化剂中通过pCO（2）处理是静态的，但由于POC的不成比例增加，在OA下PIC：POC减少了。狐埃希氏菌DMSPp细胞（-1）的浓度增加（s2668）或对OA呈非线性反应（s374）。 OA暴露导致单倍体和二倍体菌株的细胞和球囊体积分别从环境到高pCO（2）处理分别增加18％和37％，尽管交叉处理的增长率相同。因此，当归一化为细胞和球囊体积时，在OA下细胞组分的增加很小到可以忽略不计，转化为这些相同组分的细胞和球囊密度降低（例如质量vol（-1））。取决于数据标准化，这会产生对OA的看似矛盾的细胞反应，并突出显示了在未报告细胞和球壳大小的情况下需要谨慎解释OA实验数据的需求。 OA诱导的细胞和球囊大小的持续增加，对赫氏大肠杆菌的细胞生理学，生态学和营养相互作用具有影响，因为细胞大小是控制细胞速率过程，捕食者遇到率和捕食者摄入效率的主要特征。此外，由于POC和PON不会随体积增加而缩放，因此在OA下，赫氏大肠杆菌中的碳和氮浓度存在稀释。随着捕食者摄入速度和生长效率的调整，这一结果可能对浮游食物网产生连锁效应。 （C）2016 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号