Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground
Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exist on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/414246 2023-11-12T04:12:44+01:00 Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground Hanz, Ulrike Roberts, Emyr Martyn Duineveld, Gerard Davies, Andrew van Haren, Hans Rapp, Hans Tore Reichart, Gert Jan Mienis, Furu non-UU output of UU-AW members 2021-03 application/pdf https://dspace.library.uu.nl/handle/1874/414246 en eng 2169-9275 https://dspace.library.uu.nl/handle/1874/414246 info:eu-repo/semantics/OpenAccess environmental conditions food supply internal waves long-term monitoring seamount sponge ground Geochemistry and Petrology Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Oceanography Article 2021 ftunivutrecht 2023-11-01T23:27:23Z Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exist on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a deep-sea sponge ground located on an Arctic Mid-Ocean Ridge seamount. Hydrodynamic measurements were performed along Conductivity-Temperature-Depth transects, and a lander was deployed within the sponge ground that recorded near-bottom physical properties as well as vertical fluxes of organic matter over an annual cycle. The data demonstrate that the sponge ground is found at water temperatures of −0.5°C to 1°C and is situated at the interface between two water masses at only 0.7° equatorward of the turning point latitude of semi-diurnal lunar internal tides. Internal waves supported by vertical density stratification interact with the seamount topography and produce turbulent mixing as well as resuspension of organic matter with temporarily very high current speeds up to 0.72 m s−1. The vertical movement of the water column delivers food and nutrients from water layers above and below toward the sponge ground. Highest organic carbon flux was observed during the summer phytoplankton bloom period, providing fresh organic matter from the surface. The flux of fresh organic matter is unlikely to sustain the carbon demand of this ecosystem. Therefore, the availability of bacteria, nutrients, and dissolved and particulate matter, delivered by tidally forced internal wave turbulence and transport by horizontal mean flows, likely plays an important role in meeting ecosystem-level food requirements. Article in Journal/Newspaper Arctic Phytoplankton Utrecht University Repository Arctic |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
environmental conditions food supply internal waves long-term monitoring seamount sponge ground Geochemistry and Petrology Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Oceanography |
spellingShingle |
environmental conditions food supply internal waves long-term monitoring seamount sponge ground Geochemistry and Petrology Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Oceanography Hanz, Ulrike Roberts, Emyr Martyn Duineveld, Gerard Davies, Andrew van Haren, Hans Rapp, Hans Tore Reichart, Gert Jan Mienis, Furu Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground |
topic_facet |
environmental conditions food supply internal waves long-term monitoring seamount sponge ground Geochemistry and Petrology Geophysics Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Oceanography |
description |
Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exist on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a deep-sea sponge ground located on an Arctic Mid-Ocean Ridge seamount. Hydrodynamic measurements were performed along Conductivity-Temperature-Depth transects, and a lander was deployed within the sponge ground that recorded near-bottom physical properties as well as vertical fluxes of organic matter over an annual cycle. The data demonstrate that the sponge ground is found at water temperatures of −0.5°C to 1°C and is situated at the interface between two water masses at only 0.7° equatorward of the turning point latitude of semi-diurnal lunar internal tides. Internal waves supported by vertical density stratification interact with the seamount topography and produce turbulent mixing as well as resuspension of organic matter with temporarily very high current speeds up to 0.72 m s−1. The vertical movement of the water column delivers food and nutrients from water layers above and below toward the sponge ground. Highest organic carbon flux was observed during the summer phytoplankton bloom period, providing fresh organic matter from the surface. The flux of fresh organic matter is unlikely to sustain the carbon demand of this ecosystem. Therefore, the availability of bacteria, nutrients, and dissolved and particulate matter, delivered by tidally forced internal wave turbulence and transport by horizontal mean flows, likely plays an important role in meeting ecosystem-level food requirements. |
author2 |
non-UU output of UU-AW members |
format |
Article in Journal/Newspaper |
author |
Hanz, Ulrike Roberts, Emyr Martyn Duineveld, Gerard Davies, Andrew van Haren, Hans Rapp, Hans Tore Reichart, Gert Jan Mienis, Furu |
author_facet |
Hanz, Ulrike Roberts, Emyr Martyn Duineveld, Gerard Davies, Andrew van Haren, Hans Rapp, Hans Tore Reichart, Gert Jan Mienis, Furu |
author_sort |
Hanz, Ulrike |
title |
Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground |
title_short |
Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground |
title_full |
Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground |
title_fullStr |
Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground |
title_full_unstemmed |
Long-term Observations Reveal Environmental Conditions and Food Supply Mechanisms at an Arctic Deep-Sea Sponge Ground |
title_sort |
long-term observations reveal environmental conditions and food supply mechanisms at an arctic deep-sea sponge ground |
publishDate |
2021 |
url |
https://dspace.library.uu.nl/handle/1874/414246 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Phytoplankton |
genre_facet |
Arctic Phytoplankton |
op_relation |
2169-9275 https://dspace.library.uu.nl/handle/1874/414246 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331102228119552 |