Vis enkel innførsel

dc.contributor.authorSchmidt, Christiane
dc.contributor.authorGeslin, Emmanuelle
dc.contributor.authorBernhard, Joan M.
dc.contributor.authorLeKieffre, Charlotte
dc.contributor.authorSvenning, Mette Marianne
dc.contributor.authorRoberge, Helene
dc.contributor.authorSchweizer, Magali
dc.contributor.authorPanieri, Giuliana
dc.date.accessioned2022-09-06T11:56:28Z
dc.date.available2022-09-06T11:56:28Z
dc.date.issued2022-08-30
dc.description.abstractSeveral foraminifera are deposit feeders that consume organic detritus (dead particulate organic material with entrained bacteria). However, the role of such foraminifera in the benthic food web remains understudied. Foraminifera feeding on methanotrophic bacteria, which are 13C-depleted, may cause negative cytoplasmic and/or calcitic δ13C values. To test whether the foraminiferal diet includes methanotrophs, we performed a short-term (20 h) feeding experiment with Nonionellina labradorica from an active Arctic methane-emission site (Storfjordrenna, Barents Sea) using the marine methanotroph Methyloprofundus sedimenti and analysed N. labradorica cytology via transmission electron microscopy (TEM). We hypothesised that M. sedimenti would be visible post-experiment in degradation vacuoles, as evidenced by their ultrastructure. Sediment grains (mostly clay) occurred inside one or several degradation vacuoles in all foraminifers. In 24 % of the specimens from the feeding experiment degradation vacuoles also contained bacteria, although none could be confirmed to be the offered M. sedimenti. Observations of the apertural area after 20 h incubation revealed three putative methanotrophs, close to clay particles, based on bacterial ultrastructural characteristics. Furthermore, we noted the absence of bacterial endobionts in all examined N. labradorica but confirmed the presence of kleptoplasts, which were often partially degraded. In sum, we suggest that M. sedimenti can be consumed via untargeted grazing in seeps and that N. labradorica can be generally classified as a deposit feeder at this Arctic siteen_US
dc.identifier.citationSchmidt C, Geslin E, Bernhard JM, LeKieffre C, Svenning MM, Roberge H, Schweizer M, Panieri G. Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph. Biogeosciences. 2022;19:3897-3909en_US
dc.identifier.cristinIDFRIDAID 2047226
dc.identifier.doi10.5194/bg-19-3897-2022
dc.identifier.issn1726-4170
dc.identifier.issn1726-4189
dc.identifier.urihttps://hdl.handle.net/10037/26670
dc.language.isoengen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.journalBiogeosciences
dc.relation.projectIDDeutsche Forschungsgemeinschaft: 444059848en_US
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDNorges forskningsråd: 255250en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.titleDeposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotrophen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel