气候变化领域集成服务门户(CCPortal): Protistan grazing impacts microbial communities and carbon cycling at deep-sea hydrothermal vents

CCPortal

DOI	10.1073/pnas.2102674118
	Protistan grazing impacts microbial communities and carbon cycling at deep-sea hydrothermal vents
	Hu S.K.; Herrera E.L.; Smith A.R.; Pachiadaki M.G.; Edgcomb V.P.; Sylva S.P.; Chan E.W.; Seewald J.S.; German C.R.; Huber J.A.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:29
英文摘要	Microbial eukaryotes (or protists) in marine ecosystems are a link between primary producers and all higher trophic levels, and the rate at which heterotrophic protistan grazers consume microbial prey is a key mechanism for carbon transport and recycling in microbial food webs. At deep-sea hydrothermal vents, chemosynthetic bacteria and archaea form the base of a food web that functions in the absence of sunlight, but the role of protistan grazers in these highly productive ecosystems is largely unexplored. Here, we pair grazing experiments with a molecular survey to quantify protistan grazing and to characterize the composition of vent-associated protists in low-temperature diffuse venting fluids from Gorda Ridge in the northeast Pacific Ocean. Results reveal protists exert higher predation pressure at vents compared to the surrounding deep seawater environment and may account for consuming 28 to 62% of the daily stock of prokaryotic biomass within discharging hydrothermal vent fluids. The vent-associated protistan community was more species rich relative to the background deep sea, and patterns in the distribution and co-occurrence of vent microbes provide additional insights into potential predator–prey interactions. Ciliates, followed by dinoflagellates, Syndiniales, rhizaria, and stramenopiles, dominated the vent protistan community and included bacterivorous species, species known to host symbionts, and parasites. Our findings provide an estimate of protistan grazing pressure within hydrothermal vent food webs, highlighting the important role that diverse protistan communities play in deep-sea carbon cycling. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Deep-sea hydrothermal vents \| microbial eukaryotes \| predator–prey interactions \| deep-sea food web ecology \| protists
语种	英语
scopus关键词	RNA 18S; Alveolata; Amoebozoa; Apusozoa; Archaeplastida; Article; bacterivore; carbon cycling; ciliate; deep sea; dinoflagellate; environmental impact assessment; eukaryotes by habitat; Excavata; food web; grazing; Hacrobia; hydrothermal vent; low temperature; microbial biomass; microbial community; molecular dynamics; nonhuman; Oregon; Pacific Ocean; phagotroph; predation; predator prey interaction; protistan community; Rhizaria; species composition; species distribution; stramenopile; Syndiniale; Syndiniales
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238468
作者单位	Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Biology, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Geology & Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; School of Earth, Environment, and Marine Sciences, University of Texas Rio Grande Valley, Edinburg, TX 78539, United States
推荐引用方式 GB/T 7714	Hu S.K.,Herrera E.L.,Smith A.R.,et al. Protistan grazing impacts microbial communities and carbon cycling at deep-sea hydrothermal vents[J],2021,118(29).
APA	Hu S.K..,Herrera E.L..,Smith A.R..,Pachiadaki M.G..,Edgcomb V.P..,...&Huber J.A..(2021).Protistan grazing impacts microbial communities and carbon cycling at deep-sea hydrothermal vents.Proceedings of the National Academy of Sciences of the United States of America,118(29).
MLA	Hu S.K.,et al."Protistan grazing impacts microbial communities and carbon cycling at deep-sea hydrothermal vents".Proceedings of the National Academy of Sciences of the United States of America 118.29(2021).