Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait
Abstract Repeated measurements of benthic and pelagic parameters in the rapidly changing Arctic Ocean provide a unique insight into spatial and interannual trends and changes in the ecosystem. Here, we compiled biogenic and biogeochemical measurements collected from sediment cores at the Long-Term E...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2024
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/icesjms/fsae113 https://academic.oup.com/icesjms/advance-article-pdf/doi/10.1093/icesjms/fsae113/58921812/fsae113.pdf |
id |
croxfordunivpr:10.1093/icesjms/fsae113 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/icesjms/fsae113 2024-09-15T17:53:55+00:00 Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait Ramondenc, Simon Iversen, Morten H Soltwedel, Thomas Ji, Rubao Federal Ministry of Education and Research 2024 http://dx.doi.org/10.1093/icesjms/fsae113 https://academic.oup.com/icesjms/advance-article-pdf/doi/10.1093/icesjms/fsae113/58921812/fsae113.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science ISSN 1054-3139 1095-9289 journal-article 2024 croxfordunivpr https://doi.org/10.1093/icesjms/fsae113 2024-09-03T04:13:26Z Abstract Repeated measurements of benthic and pelagic parameters in the rapidly changing Arctic Ocean provide a unique insight into spatial and interannual trends and changes in the ecosystem. Here, we compiled biogenic and biogeochemical measurements collected from sediment cores at the Long-Term Ecological Research Observatory HAUSGARTEN located in the Fram Strait. A total of 21 stations were visited yearly over a period of 18 years (2002–2019). The time series highlighted an increase in bacterial numbers for samples collected 50 days after the peak phytoplankton bloom. Although bacterial abundances were not bathymetric depth-dependent when viewed across all years, we observed a seasonal trend in benthic microbial abundance closely related to the timing of the phytoplankton bloom with a time-lag of 100 days between the surface phytoplankton peak and the peak in bacterial abundance in the sediment. Considering the residence time of phytoplankton in the upper ocean and the water depth, we estimated an average settling velocity for phytodetritus of 30 m.d−1, which is similar to previous observations from Fram Strait. This suggests that settling organic matter promotes vertical microbial connectivity and benthic bacterial abundance in the deep ocean, shaping the microbial biogeography, diversity, and biogeochemical processes. Article in Journal/Newspaper Arctic Ocean Fram Strait Phytoplankton Oxford University Press ICES Journal of Marine Science |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
Abstract Repeated measurements of benthic and pelagic parameters in the rapidly changing Arctic Ocean provide a unique insight into spatial and interannual trends and changes in the ecosystem. Here, we compiled biogenic and biogeochemical measurements collected from sediment cores at the Long-Term Ecological Research Observatory HAUSGARTEN located in the Fram Strait. A total of 21 stations were visited yearly over a period of 18 years (2002–2019). The time series highlighted an increase in bacterial numbers for samples collected 50 days after the peak phytoplankton bloom. Although bacterial abundances were not bathymetric depth-dependent when viewed across all years, we observed a seasonal trend in benthic microbial abundance closely related to the timing of the phytoplankton bloom with a time-lag of 100 days between the surface phytoplankton peak and the peak in bacterial abundance in the sediment. Considering the residence time of phytoplankton in the upper ocean and the water depth, we estimated an average settling velocity for phytodetritus of 30 m.d−1, which is similar to previous observations from Fram Strait. This suggests that settling organic matter promotes vertical microbial connectivity and benthic bacterial abundance in the deep ocean, shaping the microbial biogeography, diversity, and biogeochemical processes. |
author2 |
Ji, Rubao Federal Ministry of Education and Research |
format |
Article in Journal/Newspaper |
author |
Ramondenc, Simon Iversen, Morten H Soltwedel, Thomas |
spellingShingle |
Ramondenc, Simon Iversen, Morten H Soltwedel, Thomas Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait |
author_facet |
Ramondenc, Simon Iversen, Morten H Soltwedel, Thomas |
author_sort |
Ramondenc, Simon |
title |
Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait |
title_short |
Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait |
title_full |
Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait |
title_fullStr |
Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait |
title_full_unstemmed |
Long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the Fram Strait |
title_sort |
long-term measurements reveal a 100-day lag between peaks in phytoplankton chlorophyll and benthic bacterial abundance in the fram strait |
publisher |
Oxford University Press (OUP) |
publishDate |
2024 |
url |
http://dx.doi.org/10.1093/icesjms/fsae113 https://academic.oup.com/icesjms/advance-article-pdf/doi/10.1093/icesjms/fsae113/58921812/fsae113.pdf |
genre |
Arctic Ocean Fram Strait Phytoplankton |
genre_facet |
Arctic Ocean Fram Strait Phytoplankton |
op_source |
ICES Journal of Marine Science ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsae113 |
container_title |
ICES Journal of Marine Science |
_version_ |
1810430039653613568 |