...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Effect of Euxinic Conditions on Planktic Foraminifers: Culture Experiments and Implications for Past and Future Environments
【24h】

Effect of Euxinic Conditions on Planktic Foraminifers: Culture Experiments and Implications for Past and Future Environments

机译：辣椒菌条件对血管传感器的影响：过去和未来环境的培养实验与含义

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 oceanic redox state is an essential determinant for life on Earth, and "anoxic events," periods when large parts of the oceans were anoxic or euxinic (free hydrogen sulfide (H_2S) present), may have substantially affected the oceanic biosphere. We present the first culture data showing the effects of euxinic conditions on planktic foraminifers. We cultured six species of planktic foraminifers (n = 31) in three treatments: ~2 mg H_2S/L, ~9 mg H_2S/L, and a control, without H_2S. Under the H_2S treatments, planktic foraminifers did not survive for more than 48 hr, and gametogenesis percentages were very low (8% and 17%), while the time to gametogenesis was short (less than 1 day). However, some species (e.g., Neogloboquadrina dutertrei) survived episodic or temporary exposure to H_2S for a relatively short time (i.e., <24 hr, such as a tidal cycle), indicating species-specific tolerance levels for H_2S. The biological response of foraminifers to euxinia thus is fundamentally different from that of dysoxia (i.e., low dissolved oxygen; ~0.7 mg O_2/L or ~22 μmol O_2/L), when they survive, add chambers, feed, and undergo gametogenesis. The presence/absence of planktic foraminifers in sediments thus may help to elucidate the redox state of the euphotic zone in the oceans of the past, with planktic foraminifers absent in sediments deposited when euphotic waters became euxinic.
机译：海洋氧化还原状态是​​地球生命的基本决定因素，以及“缺氧事件”，当大部分海洋是缺氧或肠系（H_2S）的大部分症时，可能大大影响了海洋生物圈。我们介绍了第一培养数据，显示了营养状况对综合性传染率的影响。我们在三种治疗中培养了六种综合性火花素（n = 31）：〜2mg H_2S / L，〜9mg H_2S / L和控制，没有H_2S。在H_2S治疗下，综合花草素物质没有存活超过48小时，并且配子发生百分比非常低（8％和17％），而配子发生的时间短（不到1天）。然而，一些物种（例如，Neogloboquadrina dutertrei）存活过暂缓的细节或临时暴露于H_2s的相对较短的时间（即<24小时，例如潮汐循环），表明H_2s的物种特异性耐受性。因此，对肠炎对肠炎的生物反应与二氧化碳辛（即，低溶解氧;〜0.7mg O_2 / L或〜22μmolO_2 / L）的根本不同。因此，沉积物中的塑料火影物的存在/不存在可能有助于阐明过去的海洋中的Euphotic区的氧化还原状态，当Euphotic水域变得肠系中时，沉积物中缺席的沉积物中没有沉积的综合花絮。

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