Drivers of pelagic and benthic microbial communities on Central Arctic seamounts
Seamounts are abundant features on the seafloor that serve as hotspots and barriers for the dispersal of benthic organisms. The primary focus of seamount ecology has typically been on the composition and distribution of faunal communities, with far less attention given to microbial communities. Here...
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Online Access: | https://doi.org/10.3389/fmars.2023.1216442 https://doaj.org/article/4bd44a46b16f4e4286f6b20723c903fc |
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ftdoajarticles:oai:doaj.org/article:4bd44a46b16f4e4286f6b20723c903fc 2023-12-03T10:17:09+01:00 Drivers of pelagic and benthic microbial communities on Central Arctic seamounts Anabel von Jackowski Maren Walter Timo Spiegel Pier Luigi Buttigieg Massimiliano Molari 2023-10-01T00:00:00Z https://doi.org/10.3389/fmars.2023.1216442 https://doaj.org/article/4bd44a46b16f4e4286f6b20723c903fc EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2023.1216442/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1216442 https://doaj.org/article/4bd44a46b16f4e4286f6b20723c903fc Frontiers in Marine Science, Vol 10 (2023) Arctic seamount water column sediments porewater microbes Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2023 ftdoajarticles https://doi.org/10.3389/fmars.2023.1216442 2023-11-05T01:40:59Z Seamounts are abundant features on the seafloor that serve as hotspots and barriers for the dispersal of benthic organisms. The primary focus of seamount ecology has typically been on the composition and distribution of faunal communities, with far less attention given to microbial communities. Here, we investigated the microbial communities in the water column (0-3400 m depth) and sediments (619-3883 m depth, 0-16 cm below seafloor) along the ice-covered Arctic ridge system called the Langseth Ridge. We contextualized the microbial community composition with data on the benthic trophic state (i.e., organic matter, chlorophyll-a content, and porewater geochemistry) and substrate type (i.e., sponge mats, sediments, basaltic pebbles). Our results showed slow current velocities throughout the water column, a shift in the pelagic microbial community from a dominance of Bacteroidia in the 0-10 m depth towards Proteobacteria and Nitrososphaeria below the epipelagic zone. In general, the pelagic microbial communities showed a high degree of similarity between the Langseth Ridge seamounts to a northern reference site. The only notable differences were decreases in richness between ~600 m and the bottom waters (~10 m above the seafloor) that suggest a pelagic-benthic coupling mediated by filter feeding of sponges living on the seamount summits. On the seafloor, the sponge spicule mats, and polychaete worms were the principal source of variation in sedimentary biogeochemistry and the benthic microbial community structure. The porewater signature suggested that low organic matter degradation rates are accompanied by a microbial community typical of deep-sea oligotrophic environments, such as Proteobacteria, Acidimicrobiia, Dehalococcoidia, Nitrospira, and archaeal Nitrososphaeria. The combined analysis of biogeochemical parameters and the microbial community suggests that the sponges play a significant role for pelagic-benthic coupling and acted as ecosystem engineers on the seafloor of ice-covered seamounts in the ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Langseth ENVELOPE(15.668,15.668,68.338,68.338) Frontiers in Marine Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic seamount water column sediments porewater microbes Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Arctic seamount water column sediments porewater microbes Science Q General. Including nature conservation geographical distribution QH1-199.5 Anabel von Jackowski Maren Walter Timo Spiegel Pier Luigi Buttigieg Massimiliano Molari Drivers of pelagic and benthic microbial communities on Central Arctic seamounts |
topic_facet |
Arctic seamount water column sediments porewater microbes Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Seamounts are abundant features on the seafloor that serve as hotspots and barriers for the dispersal of benthic organisms. The primary focus of seamount ecology has typically been on the composition and distribution of faunal communities, with far less attention given to microbial communities. Here, we investigated the microbial communities in the water column (0-3400 m depth) and sediments (619-3883 m depth, 0-16 cm below seafloor) along the ice-covered Arctic ridge system called the Langseth Ridge. We contextualized the microbial community composition with data on the benthic trophic state (i.e., organic matter, chlorophyll-a content, and porewater geochemistry) and substrate type (i.e., sponge mats, sediments, basaltic pebbles). Our results showed slow current velocities throughout the water column, a shift in the pelagic microbial community from a dominance of Bacteroidia in the 0-10 m depth towards Proteobacteria and Nitrososphaeria below the epipelagic zone. In general, the pelagic microbial communities showed a high degree of similarity between the Langseth Ridge seamounts to a northern reference site. The only notable differences were decreases in richness between ~600 m and the bottom waters (~10 m above the seafloor) that suggest a pelagic-benthic coupling mediated by filter feeding of sponges living on the seamount summits. On the seafloor, the sponge spicule mats, and polychaete worms were the principal source of variation in sedimentary biogeochemistry and the benthic microbial community structure. The porewater signature suggested that low organic matter degradation rates are accompanied by a microbial community typical of deep-sea oligotrophic environments, such as Proteobacteria, Acidimicrobiia, Dehalococcoidia, Nitrospira, and archaeal Nitrososphaeria. The combined analysis of biogeochemical parameters and the microbial community suggests that the sponges play a significant role for pelagic-benthic coupling and acted as ecosystem engineers on the seafloor of ice-covered seamounts in the ... |
format |
Article in Journal/Newspaper |
author |
Anabel von Jackowski Maren Walter Timo Spiegel Pier Luigi Buttigieg Massimiliano Molari |
author_facet |
Anabel von Jackowski Maren Walter Timo Spiegel Pier Luigi Buttigieg Massimiliano Molari |
author_sort |
Anabel von Jackowski |
title |
Drivers of pelagic and benthic microbial communities on Central Arctic seamounts |
title_short |
Drivers of pelagic and benthic microbial communities on Central Arctic seamounts |
title_full |
Drivers of pelagic and benthic microbial communities on Central Arctic seamounts |
title_fullStr |
Drivers of pelagic and benthic microbial communities on Central Arctic seamounts |
title_full_unstemmed |
Drivers of pelagic and benthic microbial communities on Central Arctic seamounts |
title_sort |
drivers of pelagic and benthic microbial communities on central arctic seamounts |
publisher |
Frontiers Media S.A. |
publishDate |
2023 |
url |
https://doi.org/10.3389/fmars.2023.1216442 https://doaj.org/article/4bd44a46b16f4e4286f6b20723c903fc |
long_lat |
ENVELOPE(15.668,15.668,68.338,68.338) |
geographic |
Arctic Langseth |
geographic_facet |
Arctic Langseth |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Frontiers in Marine Science, Vol 10 (2023) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2023.1216442/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1216442 https://doaj.org/article/4bd44a46b16f4e4286f6b20723c903fc |
op_doi |
https://doi.org/10.3389/fmars.2023.1216442 |
container_title |
Frontiers in Marine Science |
container_volume |
10 |
_version_ |
1784264113710432256 |