Controls on and paleoceanographic utility of the valve size frequency distribution of the Southern Ocean diatom, Fragilariopsis kerguelensis

南大洋硅藻 Fragilariopsis kerguelensis 阀门大小频率分布的控制和古海洋学应用

• 批准号: 75446113
• 负责人: Dr. Christina de la Rocha
• 金额: --
• 依托单位: Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/75446113?language=en
• 关键词: Controls; paleoceanographic; utility; valve; size

Unraveling the role of the Southern Ocean's biological pump in regulating climate would be enhanced by the development of paleoceanographic proxies specific to carbon or silica cycling. Observations that the average size of valves of the diatom, Fragilariopsis kerguelensis, varies seasonally, with latitude, and over glacial-interglacial cycles in the Southern Ocean suggest that the valve size frequency distribution in sediments could be used to reconstruct aspects of paleoproductivity and silica cycling. We aim to develop this proxy by using culture, field and sediment samples to determine the exact controls on valve size frequency distributions, the most important of which is likely to be the frequency of auxospore formation within the population. The controls on auxospore formation are as yet unknown and both mating experiments in culture as well as in situ iron fertilization experiments are likely to unravel the mechanisms determining auxospore formation under both controlled and field conditions. The valve size frequency distribution can then be used to indicate the intensity of the environmental and/or biological conditions triggering auxospore formation.

通过开发专门针对碳循环或二氧化硅循环的古海洋学指标，将有助于揭示南大洋生物泵在调节气候方面的作用。南大洋硅藻(Fragilariopsis Kerguelsis)瓣膜的平均大小随季节、纬度和冰川-间冰旋回而变化，这表明沉积物中瓣膜大小的频率分布可以用来重建古生产力和硅质循环的方面。我们的目标是通过使用培养、田间和沉积物样本来确定阀门大小频率分布的准确控制，其中最重要的可能是种群内辅助孢子形成的频率。对辅助孢子形成的控制尚不清楚，培养交配实验和现场铁肥实验都可能揭开控制和田间条件下决定辅助孢子形成的机制。然后，瓣膜大小的频率分布可以用来指示触发辅助孢子形成的环境和/或生物条件的强度。

项目成果

Thick-shelled, grazer-protected diatoms decouple ocean carbon and silicon cycles in the iron-limited Antarctic Circumpolar Current

• DOI: 10.1073/pnas.1309345110
• 发表时间: 2013-12-17
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Assmy, Philipp;Smetacek, Victor;Wolf-Gladrow, Dieter
• 通讯作者: Wolf-Gladrow, Dieter

Genetic characterization and life cycle of the diatom Fragilariopsis kerguelensis

• DOI: 10.1080/09670262.2013.849360
• 发表时间: 2013-11-01
• 期刊: EUROPEAN JOURNAL OF PHYCOLOGY
• 影响因子: 2.4
• 作者: Fuchs, Nike;Scalco, Eleonora;Montresor, Marina
• 通讯作者: Montresor, Marina