Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland)
Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter source...
Published in: | Marine Ecology Progress Series |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2019
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Online Access: | https://pure.au.dk/portal/en/publications/7d020343-2899-4aec-ad22-7cec51d3e0fa https://doi.org/10.3354/meps12857 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/7d020343-2899-4aec-ad22-7cec51d3e0fa 2024-01-14T10:03:12+01:00 Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) Bridier, Guillaume Meziane, Tarik Grall, Jacques Chauvaud, Laurent Sejr, Mikael Kristian Menneteau, Sylvain Olivier, Frederic 2019-02-01 https://pure.au.dk/portal/en/publications/7d020343-2899-4aec-ad22-7cec51d3e0fa https://doi.org/10.3354/meps12857 eng eng https://pure.au.dk/portal/en/publications/7d020343-2899-4aec-ad22-7cec51d3e0fa info:eu-repo/semantics/embargoedAccess Bridier , G , Meziane , T , Grall , J , Chauvaud , L , Sejr , M K , Menneteau , S & Olivier , F 2019 , ' Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) ' , Marine Ecology Progress Series , vol. 610 , pp. 15-31 . https://doi.org/10.3354/meps12857 Arctic ecosystems Benthic-pelagic coupling Organic matter Climate change Fatty acids Stable isotopes Young Sound FOOD-WEB STRUCTURE FATTY-ACID-COMPOSITION TEMPORAL VARIATIONS TROPHIC MARKERS ISOTOPE VALUES LIPID CLASSES SPRING BLOOM ANATOMICAL DISTRIBUTIONS PHYTOPLANKTON BLOOMS NORTHEAST GREENLAND article 2019 ftuniaarhuspubl https://doi.org/10.3354/meps12857 2023-12-20T23:59:58Z Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter sources, quality, and transfers in systems such as fjords can impede predictions of the evolution of benthic-pelagic coupling in response to global warming. Here, sources and quality of particulate organic matter (POM) and sedimentary organic matter (SOM) were characterized along an inner-outer gradient in a High Artic fjord (Young Sound, NE Greenland) exposed to extreme seasonal and physical constraints (ice-melting associated gradients). The influence of the seasonal variability of food sources on 2 dominant filter-feeding bivalves (Astarte moerchi and Mya truncata) was also investigated. Results revealed the critical impact of long sea ice/snow cover conditions prevailing in Young Sound corresponding to a period of extremely poor and degraded POM and SOM. Freshwater inputs had a very local impact during summer, with relatively more degraded POM at the surface compared to bottom waters that were less nutritionally depleted but more heterogeneous among the sampled stations. Terrestrial inputs contributed to the SOM composition but showed a large variability along the fjord. Finally, diet analyses underlined the contrasted nutritional conditions, showing much higher lipid reserves in A. moerchi than in M. truncata during winter. Under a scenario with increased freshwater input, such results suggest a decline in organic matter quality and production in Young Sound, with subsequent impacts on benthic food webs. Article in Journal/Newspaper Arctic Arctic Climate change Global warming Greenland Phytoplankton Sea ice Aarhus University: Research Arctic Greenland Marine Ecology Progress Series 610 15 31 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Arctic ecosystems Benthic-pelagic coupling Organic matter Climate change Fatty acids Stable isotopes Young Sound FOOD-WEB STRUCTURE FATTY-ACID-COMPOSITION TEMPORAL VARIATIONS TROPHIC MARKERS ISOTOPE VALUES LIPID CLASSES SPRING BLOOM ANATOMICAL DISTRIBUTIONS PHYTOPLANKTON BLOOMS NORTHEAST GREENLAND |
spellingShingle |
Arctic ecosystems Benthic-pelagic coupling Organic matter Climate change Fatty acids Stable isotopes Young Sound FOOD-WEB STRUCTURE FATTY-ACID-COMPOSITION TEMPORAL VARIATIONS TROPHIC MARKERS ISOTOPE VALUES LIPID CLASSES SPRING BLOOM ANATOMICAL DISTRIBUTIONS PHYTOPLANKTON BLOOMS NORTHEAST GREENLAND Bridier, Guillaume Meziane, Tarik Grall, Jacques Chauvaud, Laurent Sejr, Mikael Kristian Menneteau, Sylvain Olivier, Frederic Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) |
topic_facet |
Arctic ecosystems Benthic-pelagic coupling Organic matter Climate change Fatty acids Stable isotopes Young Sound FOOD-WEB STRUCTURE FATTY-ACID-COMPOSITION TEMPORAL VARIATIONS TROPHIC MARKERS ISOTOPE VALUES LIPID CLASSES SPRING BLOOM ANATOMICAL DISTRIBUTIONS PHYTOPLANKTON BLOOMS NORTHEAST GREENLAND |
description |
Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter sources, quality, and transfers in systems such as fjords can impede predictions of the evolution of benthic-pelagic coupling in response to global warming. Here, sources and quality of particulate organic matter (POM) and sedimentary organic matter (SOM) were characterized along an inner-outer gradient in a High Artic fjord (Young Sound, NE Greenland) exposed to extreme seasonal and physical constraints (ice-melting associated gradients). The influence of the seasonal variability of food sources on 2 dominant filter-feeding bivalves (Astarte moerchi and Mya truncata) was also investigated. Results revealed the critical impact of long sea ice/snow cover conditions prevailing in Young Sound corresponding to a period of extremely poor and degraded POM and SOM. Freshwater inputs had a very local impact during summer, with relatively more degraded POM at the surface compared to bottom waters that were less nutritionally depleted but more heterogeneous among the sampled stations. Terrestrial inputs contributed to the SOM composition but showed a large variability along the fjord. Finally, diet analyses underlined the contrasted nutritional conditions, showing much higher lipid reserves in A. moerchi than in M. truncata during winter. Under a scenario with increased freshwater input, such results suggest a decline in organic matter quality and production in Young Sound, with subsequent impacts on benthic food webs. |
format |
Article in Journal/Newspaper |
author |
Bridier, Guillaume Meziane, Tarik Grall, Jacques Chauvaud, Laurent Sejr, Mikael Kristian Menneteau, Sylvain Olivier, Frederic |
author_facet |
Bridier, Guillaume Meziane, Tarik Grall, Jacques Chauvaud, Laurent Sejr, Mikael Kristian Menneteau, Sylvain Olivier, Frederic |
author_sort |
Bridier, Guillaume |
title |
Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) |
title_short |
Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) |
title_full |
Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) |
title_fullStr |
Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) |
title_full_unstemmed |
Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) |
title_sort |
coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a high arctic fjord (young sound, greenland) |
publishDate |
2019 |
url |
https://pure.au.dk/portal/en/publications/7d020343-2899-4aec-ad22-7cec51d3e0fa https://doi.org/10.3354/meps12857 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Climate change Global warming Greenland Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Climate change Global warming Greenland Phytoplankton Sea ice |
op_source |
Bridier , G , Meziane , T , Grall , J , Chauvaud , L , Sejr , M K , Menneteau , S & Olivier , F 2019 , ' Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) ' , Marine Ecology Progress Series , vol. 610 , pp. 15-31 . https://doi.org/10.3354/meps12857 |
op_relation |
https://pure.au.dk/portal/en/publications/7d020343-2899-4aec-ad22-7cec51d3e0fa |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.3354/meps12857 |
container_title |
Marine Ecology Progress Series |
container_volume |
610 |
container_start_page |
15 |
op_container_end_page |
31 |
_version_ |
1788058124486180864 |