Population dynamics of modern planktonic foraminifera in the western Barents Sea
This study reports on species diversity and distribution of planktonic foraminifera (PF) at the Barents Sea Opening (BSO). PF populations living in late summer (collected by mean of stratified plankton tows) and recently settled individuals (sampled by interface corer) were studied and compared. Hig...
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ftcopernicus:oai:publications.copernicus.org:bgd81311 2023-05-15T15:38:47+02:00 Population dynamics of modern planktonic foraminifera in the western Barents Sea Meilland, Julie Howa, Hélène Hulot, Vivien Demangel, Isaline Salaün, Joëlle Garlan, Thierry 2019-11-05 application/pdf https://doi.org/10.5194/bg-2019-429 https://www.biogeosciences-discuss.net/bg-2019-429/ eng eng doi:10.5194/bg-2019-429 https://www.biogeosciences-discuss.net/bg-2019-429/ eISSN: 1726-4189 Text 2019 ftcopernicus https://doi.org/10.5194/bg-2019-429 2019-12-24T09:48:16Z This study reports on species diversity and distribution of planktonic foraminifera (PF) at the Barents Sea Opening (BSO). PF populations living in late summer (collected by mean of stratified plankton tows) and recently settled individuals (sampled by interface corer) were studied and compared. High abundances reaching up to 400 ind.m −3 in tow samples and 8000 ind.cm −3 in surface sediments were recorded in the centre of the studied area while low abundances were observed in coastal areas, likely hampered by continental influences. The living and subfossil (i.e. core-top) assemblages are mainly composed of the four same species Neogloboquadrina pachyderma , Neogloboquadrina incompta , Turborotalita quinqueloba and Globigerinita uvula . The two species G. uvula and T. quinqueloba largely dominate the upper water column whereas surface sediment assemblages display especially high concentrations of N. pachyderma . The unusual dominance of G. uvula in the water sample assemblages compared to its low occurrence in surface sediments might be the signature of (1) a seasonal signal due to summer phytoplankton composition changes at the BSO, linked to the increase of summer temperature at the study site, and/or (2) a signal of a larger time-scale and wide geographical reach phenomenon inducing poleward temperate/subpolar species migration and consecutive foraminiferal assemblage diversification at high latitudes under global climate forcing. Protein concentrations were measured on single specimens and used as a proxy of individual carbon biomass. Specimens of all species show the same trend, i.e. a northward decrease of their size-normalized-protein concentration suggesting foraminiferal biomass to be potentially controlled by different constituents of their organelles (e.g. lipids). The originality of coupling data from plankton tows, protein measurements and surface sediments allows us to hypothesise that PF dynamics (seasonality and distribution) is decoupled from their metabolism. Text Barents Sea Neogloboquadrina pachyderma Planktonic foraminifera Copernicus Publications: E-Journals Barents Sea |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
This study reports on species diversity and distribution of planktonic foraminifera (PF) at the Barents Sea Opening (BSO). PF populations living in late summer (collected by mean of stratified plankton tows) and recently settled individuals (sampled by interface corer) were studied and compared. High abundances reaching up to 400 ind.m −3 in tow samples and 8000 ind.cm −3 in surface sediments were recorded in the centre of the studied area while low abundances were observed in coastal areas, likely hampered by continental influences. The living and subfossil (i.e. core-top) assemblages are mainly composed of the four same species Neogloboquadrina pachyderma , Neogloboquadrina incompta , Turborotalita quinqueloba and Globigerinita uvula . The two species G. uvula and T. quinqueloba largely dominate the upper water column whereas surface sediment assemblages display especially high concentrations of N. pachyderma . The unusual dominance of G. uvula in the water sample assemblages compared to its low occurrence in surface sediments might be the signature of (1) a seasonal signal due to summer phytoplankton composition changes at the BSO, linked to the increase of summer temperature at the study site, and/or (2) a signal of a larger time-scale and wide geographical reach phenomenon inducing poleward temperate/subpolar species migration and consecutive foraminiferal assemblage diversification at high latitudes under global climate forcing. Protein concentrations were measured on single specimens and used as a proxy of individual carbon biomass. Specimens of all species show the same trend, i.e. a northward decrease of their size-normalized-protein concentration suggesting foraminiferal biomass to be potentially controlled by different constituents of their organelles (e.g. lipids). The originality of coupling data from plankton tows, protein measurements and surface sediments allows us to hypothesise that PF dynamics (seasonality and distribution) is decoupled from their metabolism. |
format |
Text |
author |
Meilland, Julie Howa, Hélène Hulot, Vivien Demangel, Isaline Salaün, Joëlle Garlan, Thierry |
spellingShingle |
Meilland, Julie Howa, Hélène Hulot, Vivien Demangel, Isaline Salaün, Joëlle Garlan, Thierry Population dynamics of modern planktonic foraminifera in the western Barents Sea |
author_facet |
Meilland, Julie Howa, Hélène Hulot, Vivien Demangel, Isaline Salaün, Joëlle Garlan, Thierry |
author_sort |
Meilland, Julie |
title |
Population dynamics of modern planktonic foraminifera in the western Barents Sea |
title_short |
Population dynamics of modern planktonic foraminifera in the western Barents Sea |
title_full |
Population dynamics of modern planktonic foraminifera in the western Barents Sea |
title_fullStr |
Population dynamics of modern planktonic foraminifera in the western Barents Sea |
title_full_unstemmed |
Population dynamics of modern planktonic foraminifera in the western Barents Sea |
title_sort |
population dynamics of modern planktonic foraminifera in the western barents sea |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-2019-429 https://www.biogeosciences-discuss.net/bg-2019-429/ |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Neogloboquadrina pachyderma Planktonic foraminifera |
genre_facet |
Barents Sea Neogloboquadrina pachyderma Planktonic foraminifera |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2019-429 https://www.biogeosciences-discuss.net/bg-2019-429/ |
op_doi |
https://doi.org/10.5194/bg-2019-429 |
_version_ |
1766370118619627520 |