Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway)
ABSTRACT. The Sognefjord is the longest (205 km) and deepest (1308 m) fjord in Norway, and the second-longest in the world. Coast-fjord exchange in Sognefjord is limited by a seaward sill at 170 m water depth, which causes a clear stratification between water masses as the dense oxygen-poor basin wa...
Published in: | Frontiers in Marine Science |
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ftzenodo:oai:zenodo.org:3886905 2024-09-15T18:24:27+00:00 Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway) Meyer, Heidi K Roberts, Emyr M Mienis, Furu Rapp, Hans Tore 2020-06-09 https://doi.org/10.3389/fmars.2020.00393 unknown Zenodo https://www.frontiersin.org/articles/10.3389/fmars.2020.00393/full https://www.frontiersin.org/articles/10.3389/fmars. 2020.00393/full#supplementary- material https://doi.pangaea.de/10.1594/PANGAEA.914801 https://doi.pangaea.de/10.1594/PANGAEA.918218 https://zenodo.org/communities/sponges https://zenodo.org/communities/eu https://doi.org/10.3389/fmars.2020.00393 oai:zenodo.org:3886905 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode Front Mar Sci, 7, 393, (2020-06-09) fjord fauna glass sponges megafauna Sognefjord Norwegian fjords remotely operated vehicles extreme habitats European Union (EU) Horizon 2020 Grant Agreement No 679849 Deep-sea Sponge Grounds Ecosystems of the North Atlantic: an integrated approach towards their preservation and sustainable exploitation SponGES info:eu-repo/semantics/article 2020 ftzenodo https://doi.org/10.3389/fmars.2020.00393 2024-07-26T18:37:08Z ABSTRACT. The Sognefjord is the longest (205 km) and deepest (1308 m) fjord in Norway, and the second-longest in the world. Coast-fjord exchange in Sognefjord is limited by a seaward sill at 170 m water depth, which causes a clear stratification between water masses as the dense oxygen-poor basin water mixes slowly with the well-oxygenated water directly above from the coastal ocean. Due to the homogeneity and limited variability in the deep-water, the deep slopes of Sognefjord represent the ideal setting to study how abiotic factors influence the deep-water benthic community structure. During the summer of 2017, two remotely operated vehicle (ROV) video transects were performed to compare the megabenthic community behind the sill (water depth: 1230 to 55 m; transect length: 1.39 km; distance from sill: ∼17 km) and within the central fjord (water depth: 1155–85 m; transect length: 2.43 km; distance from sill: ∼79 km). Accompanying conductivity–temperature–depth (CTD) deployments were made to measure the in situ abiotic factors and nutrient concentrations at each transect location, while the substrate characteristics (percent cover of soft and hard exposed substrate) were documented from the video footage. Here, Sognefjord’s megabenthic community composition, distribution, and species richness were analyzed in relation to abiotic factors (e.g., depth, salinity, dissolved oxygen, chlorophyll a concentration, and percent cover of hard and soft substrata) within the fjord. Basin communities were homogeneous and characterized by sponges, echinoderms, and crustaceans, whereas the shallower regions were dominated by mobile scavengers. Contrary to other fjord-based studies, species richness and diversity were stable in the fjord basin and decreased with proximity to the sill, decreasing water depth, and at the boundary between intermediate and basin water. The findings demonstrate that highly stratified fjords support stable communities in their basins; however, further research is needed to investigate the influence ... Article in Journal/Newspaper North Atlantic Glass sponges Zenodo Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
fjord fauna glass sponges megafauna Sognefjord Norwegian fjords remotely operated vehicles extreme habitats European Union (EU) Horizon 2020 Grant Agreement No 679849 Deep-sea Sponge Grounds Ecosystems of the North Atlantic: an integrated approach towards their preservation and sustainable exploitation SponGES |
spellingShingle |
fjord fauna glass sponges megafauna Sognefjord Norwegian fjords remotely operated vehicles extreme habitats European Union (EU) Horizon 2020 Grant Agreement No 679849 Deep-sea Sponge Grounds Ecosystems of the North Atlantic: an integrated approach towards their preservation and sustainable exploitation SponGES Meyer, Heidi K Roberts, Emyr M Mienis, Furu Rapp, Hans Tore Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway) |
topic_facet |
fjord fauna glass sponges megafauna Sognefjord Norwegian fjords remotely operated vehicles extreme habitats European Union (EU) Horizon 2020 Grant Agreement No 679849 Deep-sea Sponge Grounds Ecosystems of the North Atlantic: an integrated approach towards their preservation and sustainable exploitation SponGES |
description |
ABSTRACT. The Sognefjord is the longest (205 km) and deepest (1308 m) fjord in Norway, and the second-longest in the world. Coast-fjord exchange in Sognefjord is limited by a seaward sill at 170 m water depth, which causes a clear stratification between water masses as the dense oxygen-poor basin water mixes slowly with the well-oxygenated water directly above from the coastal ocean. Due to the homogeneity and limited variability in the deep-water, the deep slopes of Sognefjord represent the ideal setting to study how abiotic factors influence the deep-water benthic community structure. During the summer of 2017, two remotely operated vehicle (ROV) video transects were performed to compare the megabenthic community behind the sill (water depth: 1230 to 55 m; transect length: 1.39 km; distance from sill: ∼17 km) and within the central fjord (water depth: 1155–85 m; transect length: 2.43 km; distance from sill: ∼79 km). Accompanying conductivity–temperature–depth (CTD) deployments were made to measure the in situ abiotic factors and nutrient concentrations at each transect location, while the substrate characteristics (percent cover of soft and hard exposed substrate) were documented from the video footage. Here, Sognefjord’s megabenthic community composition, distribution, and species richness were analyzed in relation to abiotic factors (e.g., depth, salinity, dissolved oxygen, chlorophyll a concentration, and percent cover of hard and soft substrata) within the fjord. Basin communities were homogeneous and characterized by sponges, echinoderms, and crustaceans, whereas the shallower regions were dominated by mobile scavengers. Contrary to other fjord-based studies, species richness and diversity were stable in the fjord basin and decreased with proximity to the sill, decreasing water depth, and at the boundary between intermediate and basin water. The findings demonstrate that highly stratified fjords support stable communities in their basins; however, further research is needed to investigate the influence ... |
format |
Article in Journal/Newspaper |
author |
Meyer, Heidi K Roberts, Emyr M Mienis, Furu Rapp, Hans Tore |
author_facet |
Meyer, Heidi K Roberts, Emyr M Mienis, Furu Rapp, Hans Tore |
author_sort |
Meyer, Heidi K |
title |
Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway) |
title_short |
Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway) |
title_full |
Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway) |
title_fullStr |
Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway) |
title_full_unstemmed |
Drivers of Megabenthic Community Structure in One of the World's Deepest Silled-Fjords, Sognefjord (Western Norway) |
title_sort |
drivers of megabenthic community structure in one of the world's deepest silled-fjords, sognefjord (western norway) |
publisher |
Zenodo |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.00393 |
genre |
North Atlantic Glass sponges |
genre_facet |
North Atlantic Glass sponges |
op_source |
Front Mar Sci, 7, 393, (2020-06-09) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2020.00393/full https://www.frontiersin.org/articles/10.3389/fmars. 2020.00393/full#supplementary- material https://doi.pangaea.de/10.1594/PANGAEA.914801 https://doi.pangaea.de/10.1594/PANGAEA.918218 https://zenodo.org/communities/sponges https://zenodo.org/communities/eu https://doi.org/10.3389/fmars.2020.00393 oai:zenodo.org:3886905 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.3389/fmars.2020.00393 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1810464805722521600 |