Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea
Although the plankton communities in the Barents Sea have been intensely studied for decades, little is known about the living planktonic foraminiferal (LPF) and pteropod faunas, especially those found at methane seep sites. Along a repeated transect in the “crater area” (northern Barents Sea, 74.9°...
Published in: | Journal of Geophysical Research: Biogeosciences |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2644774 https://doi.org/10.1029/2019JG005387 |
id |
ftimr:oai:imr.brage.unit.no:11250/2644774 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/2644774 2023-05-15T15:10:46+02:00 Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea Ofstad, Siri Meilland, Julie Zamelczyk, Katarzyna Chierici, Melissa Fransson, Agneta Gründger, Friederike Rasmussen, Tine Lander 2020 application/pdf http://hdl.handle.net/11250/2644774 https://doi.org/10.1029/2019JG005387 eng eng Norges forskningsråd: 223259 urn:issn:2169-8953 http://hdl.handle.net/11250/2644774 https://doi.org/10.1029/2019JG005387 cristin:1797609 125 Journal of Geophysical Research (JGR): Biogeosciences 2 Journal article Peer reviewed 2020 ftimr https://doi.org/10.1029/2019JG005387 2021-09-23T20:15:32Z Although the plankton communities in the Barents Sea have been intensely studied for decades, little is known about the living planktonic foraminiferal (LPF) and pteropod faunas, especially those found at methane seep sites. Along a repeated transect in the “crater area” (northern Barents Sea, 74.9°N, 27.7°E) in spring and summer 2016 the flux of LPF and of the pteropod species Limacina helicina showed a high degree of variability. The LPF had low concentration (0–6 individuals m−3) and small tests (x̄ = 103.3 μm) in spring and a 53‐fold increase (43–436 individuals m−3) and larger tests (x̄ = 188.6 μm) in summer. Similarly, the concentration of L. helicina showed a tenfold increase between spring and summer. The LPF species composition remained stable with the exception of the appearance of subtropical species in summer. No relationship was observed between the spatial distribution of LPF, L. helicina, and methane concentrations in the area. The methane plumes in April coincided with elevated dissolved inorganic carbon, low pH, and calcium carbonate saturation states, and the methane concentration seemed to be controlled by lateral advection. The δ13C and δ18O of Neogloboquadrina pachyderma and Turborotalita quinqueloba are comparable to previous observations in the Arctic and do not show any influence of methane in the isotopic signals of the shells. Although no evidence of direct impact of high methane concentrations on the LPF (size and concentration) were found, we speculate that methane could indirectly enhance primary productivity, and thus biomass, through several potential pathways publishedVersion Article in Journal/Newspaper Arctic Barents Sea Foraminifera* Limacina helicina Neogloboquadrina pachyderma Institute for Marine Research: Brage IMR Arctic Barents Sea Journal of Geophysical Research: Biogeosciences 125 2 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
Although the plankton communities in the Barents Sea have been intensely studied for decades, little is known about the living planktonic foraminiferal (LPF) and pteropod faunas, especially those found at methane seep sites. Along a repeated transect in the “crater area” (northern Barents Sea, 74.9°N, 27.7°E) in spring and summer 2016 the flux of LPF and of the pteropod species Limacina helicina showed a high degree of variability. The LPF had low concentration (0–6 individuals m−3) and small tests (x̄ = 103.3 μm) in spring and a 53‐fold increase (43–436 individuals m−3) and larger tests (x̄ = 188.6 μm) in summer. Similarly, the concentration of L. helicina showed a tenfold increase between spring and summer. The LPF species composition remained stable with the exception of the appearance of subtropical species in summer. No relationship was observed between the spatial distribution of LPF, L. helicina, and methane concentrations in the area. The methane plumes in April coincided with elevated dissolved inorganic carbon, low pH, and calcium carbonate saturation states, and the methane concentration seemed to be controlled by lateral advection. The δ13C and δ18O of Neogloboquadrina pachyderma and Turborotalita quinqueloba are comparable to previous observations in the Arctic and do not show any influence of methane in the isotopic signals of the shells. Although no evidence of direct impact of high methane concentrations on the LPF (size and concentration) were found, we speculate that methane could indirectly enhance primary productivity, and thus biomass, through several potential pathways publishedVersion |
format |
Article in Journal/Newspaper |
author |
Ofstad, Siri Meilland, Julie Zamelczyk, Katarzyna Chierici, Melissa Fransson, Agneta Gründger, Friederike Rasmussen, Tine Lander |
spellingShingle |
Ofstad, Siri Meilland, Julie Zamelczyk, Katarzyna Chierici, Melissa Fransson, Agneta Gründger, Friederike Rasmussen, Tine Lander Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea |
author_facet |
Ofstad, Siri Meilland, Julie Zamelczyk, Katarzyna Chierici, Melissa Fransson, Agneta Gründger, Friederike Rasmussen, Tine Lander |
author_sort |
Ofstad, Siri |
title |
Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea |
title_short |
Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea |
title_full |
Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea |
title_fullStr |
Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea |
title_full_unstemmed |
Development, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Sea |
title_sort |
development, productivity, and seasonality of living planktonic foraminiferal faunas and limacina helicina in an area of intense methane seepage in the barents sea |
publishDate |
2020 |
url |
http://hdl.handle.net/11250/2644774 https://doi.org/10.1029/2019JG005387 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea Foraminifera* Limacina helicina Neogloboquadrina pachyderma |
genre_facet |
Arctic Barents Sea Foraminifera* Limacina helicina Neogloboquadrina pachyderma |
op_source |
125 Journal of Geophysical Research (JGR): Biogeosciences 2 |
op_relation |
Norges forskningsråd: 223259 urn:issn:2169-8953 http://hdl.handle.net/11250/2644774 https://doi.org/10.1029/2019JG005387 cristin:1797609 |
op_doi |
https://doi.org/10.1029/2019JG005387 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
125 |
container_issue |
2 |
_version_ |
1766341730411479040 |