Grazing impact of different heterotrophic nanoflagellates on eukaryotic (Ostreococcus tauri) and prokaryotic picoautotrophs (Prochlorococcus and Synechococcus)
Grazing impact of different heterotrophic nanoflagellates on eukaryotic (Ostreococcus tauri) and prokaryotic picoautotrophs (Prochlorococcus and Synechococcus)
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DOI：
10.1111/j.1462-2920.2005.00800.x
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发表时间：
2005-08-01
影响因子：
5.1
通讯作者：
Lebaron, P
中科院分区：
文献类型：
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作者：
Christaki, U;Vázquez-Domínguez, E;Lebaron, P
由原核生物和真核生物组成的自养超微型浮游生物（<3μm）是地球上最丰富的初级生产者。在这项研究中，我们研究了具有不同形态、游泳和摄食行为的不同海洋异养纳米鞭毛虫（HNF）对超微核生物金牛骨球菌的摄入情况。特定细菌食性纳米鞭毛虫培养物（Rhynchomonas nasuta、Jakoba libera 和 Cafeteria sp./Monosiga sp. 的培养物）和天然纳米鞭毛虫群体被用作食草动物。为了与骨球菌进行比较，我们使用类似大小的原核生物作为猎物，原绿球藻和聚球藻。我们观察到在以下方面存在较大的物种特异性差异：纳米鞭毛虫中微微自养生物的使用、猎物添加和猎物消耗之间的时间滞后（0-196小时）、放牧率（0-0.12小时（-1））、生长率（0-0.3小时（-1））和实验瓶中达到的HNF最大丰度（例如，对于天然沿海地区，从10（4）到10（5）细胞ml（-1）群体和分别喂养 Ostreococcus 的 Cafeteria sp./Monosiga sp. 培养物）。总体而言，本研究表明，纳米鞭毛虫群落组成对于超自养群落结构是决定性的，反之亦然，超自养群落结构有利于或抑制某些纳米鞭毛虫群体的生长。
Autotrophic picoplankton (< 3 mu m) composed of both prokaryotes and eukaryotes are the most abundant primary producers on Earth. In this study we examined the ingestion of the picoeukaryote Ostreococcus tauri by different marine heterotrophic nanoflagellates (HNF) with various morphologies, swimming and feeding behaviours. Cultures of specific bacterivorous nanoflagellates (Rhynchomonas nasuta, Jakoba libera, and a culture of Cafeteria sp./Monosiga sp.) and natural nanoflagellate populations were used as grazers. For comparison with Ostreococcus, we used similar-sized prokaryotes as prey, Prochlorococcus and Synechococcus. We observed large species-specific differences in terms of: use of picoautotrophs among nanoflagellates, time lag between prey addition and prey consumption (0-196 h), grazing rate (0-0.12 h(-1)), growth rate (0-0.3 h(-1)) and maximum abundance of HNF reached in experimental bottles (e.g. from 10(4) to 10(5) cells ml(-1), for a natural coastal population and a Cafeteria sp./Monosiga sp. culture feeding Ostreococcus respectively). Overall, this study shows that the nanoflagellate community composition is conclusive for picoautotrophic community structure and, vice versa, the picoautotrophic community structure favours or inhibits the growth of some nanoflagellate groups.