• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Remarkable structural resistance of a nanoflagellate- dominated plankton community to iron fertilization during the Southern Ocean experiment LOHAFEX
【24h】

Remarkable structural resistance of a nanoflagellate- dominated plankton community to iron fertilization during the Southern Ocean experiment LOHAFEX

机译：在南大洋实验LOHAFEX中，以纳米鞭毛为主的浮游生物群落对铁肥的显着结构抗性

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 genesis of phytoplankton blooms and the fate of their biomass in iron-limited, high-nutrient-low-chlorophyll regions can be studied under natural conditions with ocean iron fertilization (OIF) experiments. The Indo-German OIF experiment LOHAFEX was carried out over 40 d in late summer 2009 within the cold core of a mesoscale eddy in the productive southwest Atlantic sector of the Southern Ocean. Silicate concentrations were very low, and phytoplankton biomass was dominated by autotrophic nanoflagellates (ANF) in the size range 3-10 mu m. As in all previous OIF experiments, the phytoplankton responded to iron fertilization by increasing the maximum quantum yield (F-v/F-m) and cellular chlorophyll levels. Within 3 wk, chlorophyll levels tripled and ANF biomass doubled. With the exception of some diatoms and dinoflagellates, the biomass levels of all other groups of the phyto- and protozooplankton (heterotrophic nanoflagellates, dinoflagellates and ciliates) remained remarkably stable throughout the experiment both inside and outside the fertilized patch. We attribute the unusually high biomass attained and maintained by ANF to the absence of their grazers, the salps, and to constraints on protozooplankton grazers by heavy predation exerted by the large copepod stock. The resistance to change of the ecosystem structure over 38 d after fertilization, indicated by homogeneity at regional and temporal scales, suggests that it was locked into a stable, mature state that had evolved in the course of the seasonal cycle. The LOHAFEX bloom provides a case study of a resistant/robust dynamic equilibrium between auto-and heterotrophic ecosystem components resulting in low vertical flux both inside and outside the patch despite high biomass levels.
机译：可以在自然条件下利用海洋铁肥（OIF）实验研究浮游植物绽放的起源及其在铁含量有限，高营养，低叶绿素地区的生物量的命运。 2009年夏末40 d进行了印德OIF实验LOHAFEX，该实验是在南大西洋西南大西洋多产的中尺度涡旋的冷核中进行的。硅酸盐的浓度非常低，浮游生物的生物量以3-10微米的自养纳米鞭毛（ANF）为主。与以前的所有OIF实验一样，浮游植物通过增加最大量子产量（F-v / F-m）和细胞叶绿素水平来响应铁肥。在3周内，叶绿素水平增加了三倍，ANF生物量增加了一倍。除某些硅藻和鞭毛藻外，在整个实验过程中，受精斑块内外的所有其他种类的植物藻和原鞭毛藻（异养纳米鞭毛，鞭毛和纤毛）的生物量水平都非常稳定。我们将ANF获得和维持的异常高的生物量归因于它们的放牧者，粪便的缺失，以及由于大型co足类种群所造成的大量捕食而对原生藻浮游生物的限制。施肥后38 d对生态系统结构变化的抵抗力（通过区域和时间尺度的均一性表明）表明它已被锁定在一个稳定，成熟的状态中，该状态在季节周期的过程中不断演变。 LOHAFEX水华提供了一个案例，研究了自养和异养生态系统组件之间的抗性/鲁棒性动态平衡，尽管生物量水平很高，但导致斑块内部和外部的垂直通量较低。

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