Microbial eukaryotic predation pressure and biomass at deep-sea hydrothermal vents
Microbial eukaryotic predation pressure and biomass at deep-sea hydrothermal vents
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DOI：
10.1093/ismejo/wrae004
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发表时间：
2024-03-04
期刊：
影响因子：
11
通讯作者：
Huber，Julie A.
中科院分区：
文献类型：
--
作者：
Hu，Sarah K.;Anderson，Rika E.;Huber，Julie A.
深海热液喷口地球化学通过促进化能自养微生物活动，形成微生物食物网的基础。微生物真核生物（或原生生物）作为共生细菌的消费者和宿主，以及作为更高营养级的营养来源，在热液喷口食物网中发挥着关键作用。我们测量了微生物真核细胞丰度和捕食压力的低温扩散热液流体在冯达姆和皮卡德喷口领域沿着中开曼隆起在西加勒比海。我们目前的研究结果进行原位压力下，显示细胞丰度和放牧率高于在1个大气压（船上环境压力）的实验结果，这种趋势是由于减压对细胞完整性的影响。无论实验方法如何，在两个喷口都观察到原生生物摄食率、猎物细胞丰度和端元热液喷口流体温度之间的关系。我们的研究结果表明，大量的原生生物量在水热燃料的微生物食物网，再加上改善放牧估计，建议当地的碳出口和营养资源的深海供应的重要贡献的食草动物。
Deep-sea hydrothermal vent geochemistry shapes the foundation of the microbial food web by fueling chemolithoautotrophic microbial activity. Microbial eukaryotes (or protists) play a critical role in hydrothermal vent food webs as consumers and hosts of symbiotic bacteria, and as a nutritional source to higher trophic levels. We measured microbial eukaryotic cell abundance and predation pressure in low-temperature diffuse hydrothermal fluids at the Von Damm and Piccard vent fields along the Mid-Cayman Rise in the Western Caribbean Sea. We present findings from experiments performed underin situpressure that show cell abundances and grazing rates higher than those done at 1 atmosphere (shipboard ambient pressure); this trend was attributed to the impact of depressurization on cell integrity. A relationship between the protistan grazing rate, prey cell abundance, and temperature of end-member hydrothermal vent fluid was observed at both vent fields, regardless of experimental approach. Our results show substantial protistan biomass at hydrothermally fueled microbial food webs, and when coupled with improved grazing estimates, suggest an important contribution of grazers to the local carbon export and supply of nutrient resources to the deep ocean.