In:
Journal of Geophysical Research: Biogeosciences, American Geophysical Union (AGU), Vol. 125, No. 7 ( 2020-07)
Abstract:
This work is the first report on intact polar lipids (IPLs) of archaea in the hadal trenches, the deepest ocean realm with water depth exceeding 6,000 m. We have investigated in IPL biomarker 16S rRNA gene sequences and biogeochemical parameters in 19 sediments from the Mariana Trench, Massau Trench, and New Britain Trench. These samples are characterized by different water depth (1,560 to 10,840 m), net primary productivity (48 to 123 C m −2 year −1 ), and terrestrial influence. By comparing biomarker, gene data, and bulk geochemical parameters, we have achieved three key findings: (1) Benthic Thaumarchaeota are a major source for IPLs in hadal sediments; (2) Some IPLs positively correlate with water depth, likely reflecting an adaption mechanism of benthic archaea to elevated hydrostatic pressure or variation of archaeal community in different environments; and (3) Bathyarchaeota are more abundant in sediments receiving terrestrial input (New Britain Trench); this pattern is attributed to their capability of utilizing terrestrial organic matter as an energy source. Our findings provide important information toward understanding of the distribution and adaptation of hadal microbes to extremely high pressure, dark, and food‐depleted environments.
Type of Medium:
Online Resource
ISSN:
2169-8953
,
2169-8961
DOI:
10.1029/2019JG005431
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2020
detail.hit.zdb_id:
3094167-2
detail.hit.zdb_id:
2220777-6
SSG:
16,13
