Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems
Abstract The Arctic is exposed to unprecedented warming, at least three times higher than the global average, which induces significant melting of the cryosphere. Freshwater inputs from melting glaciers will subsequently affect coastal primary production and organic matter quality. However, due to a...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-11-01
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| Series: | Ecology and Evolution |
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| Online Access: | https://doi.org/10.1002/ece3.10691 |
| _version_ | 1797448673022443520 |
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| author | Guillaume Bridier Frédéric Olivier Jacques Grall Laurent Chauvaud Mikael K. Sejr Réjean Tremblay |
| author_facet | Guillaume Bridier Frédéric Olivier Jacques Grall Laurent Chauvaud Mikael K. Sejr Réjean Tremblay |
| author_sort | Guillaume Bridier |
| collection | DOAJ |
| description | Abstract The Arctic is exposed to unprecedented warming, at least three times higher than the global average, which induces significant melting of the cryosphere. Freshwater inputs from melting glaciers will subsequently affect coastal primary production and organic matter quality. However, due to a lack of basic knowledge on the physiology of Arctic organisms, it remains difficult to understand how these future trophic changes will threaten the long‐term survival of benthic species in coastal habitats. This study aimed to gain new insights into the seasonal lipid dynamics of four dominant benthic bivalves (Astarte moerchi, Hiatella arctica, Musculus discors, and Mya truncata) collected before and after sea ice break‐up in a high‐Arctic fjord (Young Sound, NE Greenland). Total lipid content and fatty acid composition of digestive gland neutral lipids were analyzed to assess bivalve energy reserves while the fatty acid composition of gill polar lipids was determined as a biochemical indicator of interspecies variations in metabolic activity and temperature acclimation. Results showed a decrease in lipid reserves between May and August, suggesting that bivalves have only limited access to fresh organic matter until sea ice break‐up. The lack of seasonal variation in the fatty acid composition of neutral lipids, especially essential ω3 fatty acids, indicates that no fatty acid transfer from the digestive glands to the gonads occurs between May and August, and therefore, no reproductive investment takes place during this period. Large interspecies differences in gill fatty acid composition were observed, which appear to be related to differences in species life span and metabolic strategies. Such differences in gill fatty acid composition of polar lipids, which generally influence metabolic rates and energy needs, may imply that not all benthic species will be equally sensitive to future changes in primary production and organic matter quality in Arctic coastal habitats. |
| first_indexed | 2024-03-09T14:13:45Z |
| format | Article |
| id | doaj.art-680647c5b5144997ba8135fa46d3fb05 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-03-09T14:13:45Z |
| publishDate | 2023-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-680647c5b5144997ba8135fa46d3fb052023-11-29T05:44:08ZengWileyEcology and Evolution2045-77582023-11-011311n/an/a10.1002/ece3.10691Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystemsGuillaume Bridier0Frédéric Olivier1Jacques Grall2Laurent Chauvaud3Mikael K. Sejr4Réjean Tremblay5Institut des Sciences de la mer de Rimouski Université du Québec à Rimouski Rimouski Quebec CanadaBiologie des Organismes et Ecosystèmes Aquatiques (BOREA) UMR 8067 MNHN, CNRS, SU, IRD 207, UCN, UA Paris FranceLaboratoire des Sciences de l'Environnement Marin (LEMAR) UMR 6539 UBO, CNRS, IRD, Ifremer Plouzané FranceLaboratoire des Sciences de l'Environnement Marin (LEMAR) UMR 6539 UBO, CNRS, IRD, Ifremer Plouzané FranceArctic Research Centre and Ecoscience Aarhus University Aarhus C DenmarkInstitut des Sciences de la mer de Rimouski Université du Québec à Rimouski Rimouski Quebec CanadaAbstract The Arctic is exposed to unprecedented warming, at least three times higher than the global average, which induces significant melting of the cryosphere. Freshwater inputs from melting glaciers will subsequently affect coastal primary production and organic matter quality. However, due to a lack of basic knowledge on the physiology of Arctic organisms, it remains difficult to understand how these future trophic changes will threaten the long‐term survival of benthic species in coastal habitats. This study aimed to gain new insights into the seasonal lipid dynamics of four dominant benthic bivalves (Astarte moerchi, Hiatella arctica, Musculus discors, and Mya truncata) collected before and after sea ice break‐up in a high‐Arctic fjord (Young Sound, NE Greenland). Total lipid content and fatty acid composition of digestive gland neutral lipids were analyzed to assess bivalve energy reserves while the fatty acid composition of gill polar lipids was determined as a biochemical indicator of interspecies variations in metabolic activity and temperature acclimation. Results showed a decrease in lipid reserves between May and August, suggesting that bivalves have only limited access to fresh organic matter until sea ice break‐up. The lack of seasonal variation in the fatty acid composition of neutral lipids, especially essential ω3 fatty acids, indicates that no fatty acid transfer from the digestive glands to the gonads occurs between May and August, and therefore, no reproductive investment takes place during this period. Large interspecies differences in gill fatty acid composition were observed, which appear to be related to differences in species life span and metabolic strategies. Such differences in gill fatty acid composition of polar lipids, which generally influence metabolic rates and energy needs, may imply that not all benthic species will be equally sensitive to future changes in primary production and organic matter quality in Arctic coastal habitats.https://doi.org/10.1002/ece3.10691Arctic coastal ecosystemsbivalveclimate changeenergy reservesfatty acidshomeoviscous adaptation |
| spellingShingle | Guillaume Bridier Frédéric Olivier Jacques Grall Laurent Chauvaud Mikael K. Sejr Réjean Tremblay Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems Ecology and Evolution Arctic coastal ecosystems bivalve climate change energy reserves fatty acids homeoviscous adaptation |
| title | Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems |
| title_full | Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems |
| title_fullStr | Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems |
| title_full_unstemmed | Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems |
| title_short | Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems |
| title_sort | seasonal lipid dynamics of four arctic bivalves implications for their physiological capacities to cope with future changes in coastal ecosystems |
| topic | Arctic coastal ecosystems bivalve climate change energy reserves fatty acids homeoviscous adaptation |
| url | https://doi.org/10.1002/ece3.10691 |
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