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Keystone Arctic paleoceanographic proxy association with putative methanotrophic bacteria.
- Source :
-
Scientific reports [Sci Rep] 2018 Jul 13; Vol. 8 (1), pp. 10610. Date of Electronic Publication: 2018 Jul 13. - Publication Year :
- 2018
-
Abstract
- Foraminifera in sediments exposed to gas-hydrate dissociation are not expected to have cellular adaptations that facilitate inhabitation of chemosynthesis-based ecosystems because, to date, there are no known endemic seep foraminifera. To establish if foraminifera inhabit sediments impacted by gas-hydrate dissociation, we examined the cellular ultrastructure of Melonis barleeanus (Williamson, 1858) from the Vestnesa gas hydrate province (Arctic Ocean, west of Svalbard at ~79ā°N; ~1200-m depth; nā=ā4). From sediments with gas hydrate indicators, living M. barleeanus had unusual pore plugs composed of a thick, fibrous meshwork; mitochondria were concentrated at the cell periphery, under pore plugs. While there was no evidence of endosymbioses with prokaryotes, most M. barleeanus specimens were associated with what appear to be Type I methanotrophic bacteria. One foraminifer had a particularly large bolus of these microbes concentrated near its aperture. This is the first documented instance of bona fide living M. barleeanus in gas-hydrate sediments and first documentation of a foraminifer living in close association with putative methanotrophs. Our observations have implications to paleoclimate records utilizing this foundational foraminiferal species.
- Subjects :
- Arctic Regions
Bacteria metabolism
Foraminifera cytology
Foraminifera ultrastructure
Geologic Sediments microbiology
Methane metabolism
Microscopy, Electron, Transmission
Oceanography
Paleontology
Bacteria isolation & purification
Foraminifera microbiology
Geologic Sediments parasitology
Symbiosis
Subjects
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 8
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 30006509
- Full Text :
- https://doi.org/10.1038/s41598-018-28871-3