Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph
Several 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 13 C-depleted, may cause...
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Copernicus Publications
2022
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ftdoajarticles:oai:doaj.org/article:ab28a2d767b34befb8f44a3c743dd9df 2023-05-15T14:31:46+02:00 Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph C. Schmidt E. Geslin J. M. Bernhard C. LeKieffre M. M. Svenning H. Roberge M. Schweizer G. Panieri 2022-08-01T00:00:00Z https://doi.org/10.5194/bg-19-3897-2022 https://doaj.org/article/ab28a2d767b34befb8f44a3c743dd9df EN eng Copernicus Publications https://bg.copernicus.org/articles/19/3897/2022/bg-19-3897-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-3897-2022 1726-4170 1726-4189 https://doaj.org/article/ab28a2d767b34befb8f44a3c743dd9df Biogeosciences, Vol 19, Pp 3897-3909 (2022) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/bg-19-3897-2022 2022-12-30T22:17:10Z Several 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 13 C-depleted, may cause negative cytoplasmic and/or calcitic δ 13 C 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 site. Article in Journal/Newspaper arctic methane Arctic Barents Sea Foraminifera* Storfjordrenna Directory of Open Access Journals: DOAJ Articles Arctic Barents Sea Storfjordrenna ENVELOPE(17.000,17.000,76.000,76.000) Biogeosciences 19 16 3897 3909 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 C. Schmidt E. Geslin J. M. Bernhard C. LeKieffre M. M. Svenning H. Roberge M. Schweizer G. Panieri Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Several 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 13 C-depleted, may cause negative cytoplasmic and/or calcitic δ 13 C 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 site. |
format |
Article in Journal/Newspaper |
author |
C. Schmidt E. Geslin J. M. Bernhard C. LeKieffre M. M. Svenning H. Roberge M. Schweizer G. Panieri |
author_facet |
C. Schmidt E. Geslin J. M. Bernhard C. LeKieffre M. M. Svenning H. Roberge M. Schweizer G. Panieri |
author_sort |
C. Schmidt |
title |
Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph |
title_short |
Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph |
title_full |
Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph |
title_fullStr |
Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph |
title_full_unstemmed |
Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph |
title_sort |
deposit-feeding of nonionellina labradorica (foraminifera) from an arctic methane seep site and possible association with a methanotroph |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-3897-2022 https://doaj.org/article/ab28a2d767b34befb8f44a3c743dd9df |
long_lat |
ENVELOPE(17.000,17.000,76.000,76.000) |
geographic |
Arctic Barents Sea Storfjordrenna |
geographic_facet |
Arctic Barents Sea Storfjordrenna |
genre |
arctic methane Arctic Barents Sea Foraminifera* Storfjordrenna |
genre_facet |
arctic methane Arctic Barents Sea Foraminifera* Storfjordrenna |
op_source |
Biogeosciences, Vol 19, Pp 3897-3909 (2022) |
op_relation |
https://bg.copernicus.org/articles/19/3897/2022/bg-19-3897-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-3897-2022 1726-4170 1726-4189 https://doaj.org/article/ab28a2d767b34befb8f44a3c743dd9df |
op_doi |
https://doi.org/10.5194/bg-19-3897-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
16 |
container_start_page |
3897 |
op_container_end_page |
3909 |
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1766305304048304128 |