Microbial eukaryotic predation pressure and biomass at deep-sea hydrothermal vents.

Autor:	Hu SK; Department of Oceanography, Texas A&M University, College Station, TX 77843, United States.; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., Anderson RE; Biology Department, Carleton College, Northfield, MN 55057, United States., Pachiadaki MG; Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., Edgcomb VP; Department of Geology & Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., Serres MH; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., Sylva SP; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., German CR; Department of Geology & Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., Seewald JS; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., Lang SQ; Department of Geology & Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States., Huber JA; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States.
Jazyk:	angličtina
Zdroj:	The ISME journal [ISME J] 2024 Jan 08; Vol. 18 (1).
DOI:	10.1093/ismejo/wrae004
Abstrakt:	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 under in situ pressure 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. (© The Author(s) 2024. Published by Oxford University Press on behalf of the International Society for Microbial Ecology.)
Databáze:	MEDLINE
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