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首页> 外文期刊>Marine ecology progress series >Role of heterotrophic dinoflagellates in the fate of diatoms released from fast ice in coastal water of Luetzow-Holm Bay, East Antarctica
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Role of heterotrophic dinoflagellates in the fate of diatoms released from fast ice in coastal water of Luetzow-Holm Bay, East Antarctica

机译：异养藻鞭毛藻在东极南极洲路易斯湖-霍尔姆湾沿海水域快速冰中释放的硅藻命运中的作用

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摘要

To understand the fate of ice algal diatoms released from fast ice, we investigated the abundance and sinking loss of diatoms and the grazing impact on diatoms by heterotrophic dinoflagellates (HD) under the ice near Syowa Station, Antarctica, during the austral summer of 2005-2006. After a rapid increase, diatoms showed a clear declining phase. Among the diatom assemblage, Porosira pseudodenticulata and Pseudo-nitzschia cf. turgiduloides were abundant in the water column but low in the sinking flux as they are able to maintain their position in the surface layer after release from the fast ice. Potential grazing impact by HD was calculated to reach 233 mg C m~(-2) d~(-1) equivalent to 48.7 % d~(-1) of the diatom biomass being removed daily. Only 14.9 to 71.3 mg C m~(-2) d~(-1) (2.5 to 3.2% d~(-1)) was attributable to diatom sinking loss. This suggests that a significant fraction of the diatoms was consumed in the surface layer and the sinking loss was comparatively small. HD often had ingested diatoms in rntheir cells, although ciliates rarely did, and the abundance of HD fecal pellets peaked after the diatom peak. In bottle incubations at in situ temperature, the growth rates of HD ranged from 0 to 0.19 d~(-1), indicating almost positive growth of HD in the water column. This demonstrates that HD are major consumers of the diatoms released from the fast ice, forming a dominant trophic link between diatoms and HD in the Antarctic under-ice ecosystem.
机译：为了了解快速冰中释放出来的冰藻硅藻的命运，我们调查了南极Syowa站附近的冰层中异养性鞭毛藻（HD）在2005年南半球夏季期间硅藻的丰度和下沉损失以及对硅藻的放牧影响， 2006年。快速增加后，硅藻显示出明显的下降阶段。在硅藻组合中，Porosira pseudodenticulata和Pseudo-nitzschia参见。 turgiduloides在水柱中很丰富，但下沉通量很低，因为它们在从速冻冰中释放后能够保持其在表层的位置。通过HD计算得出的潜在放牧影响达到了233 mg C m〜（-2）d〜（-1），相当于每日去除的硅藻生物量的48.7％d〜（-1）。仅14.9至71.3 mg C m〜（-2）d〜（-1）（2.5至3.2％d〜（-1））可归因于硅藻沉没损失。这表明在表面层中消耗了大量的硅藻，下沉损失相对较小。尽管纤毛很少，但HD经常将硅藻摄入其细胞中，并且HD粪便颗粒的丰度在硅藻峰之后达到峰值。在原位培养瓶中，HD的生长速率为0到0.19 d〜（-1），表明水柱中HD的生长几乎为正。这表明，HD是从快速冰中释放出来的硅藻的主要消费者，在南极冰层生态系统中，硅藻与HD之间形成了主要的营养联系。

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