FN Archimer Export Format
PT J
TI Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystems
BT 
AF Bridier, Guillaume
   Olivier, Frédéric
   Grall, Jacques
   Chauvaud, Laurent
   Sejr, Mikael K.
   Tremblay, Réjean
AS 1:1;2:2;3:3,4;4:3;5:5;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Institut des Sciences de la mer de Rimouski Université du Québec à Rimouski Rimouski Quebec, Canada
   Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) UMR 8067 MNHN, CNRS, SU, IRD 207, UCN, UA Paris ,France
   Laboratoire des Sciences de l'Environnement Marin (LEMAR) UMR 6539 UBO, CNRS, IRD, Ifremer, Plouzané, France
   Observatoire Marin de l'Institut Universitaire Européen de la Mer UMS 3113, Université de Bretagne Occidentale, Plouzané, France
   Arctic Research Centre and Ecoscience Aarhus University Aarhus C, Denmark
C2 UNIV QUEBEC (UQAR-ISMER), CANADA
   MNHN, FRANCE
   CNRS, FRANCE
   UBO, FRANCE
   UNIV AARHUS, DENMARK
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 2.6
TC 1
UR https://archimer.ifremer.fr/doc/00859/97084/105882.pdf
   https://archimer.ifremer.fr/doc/00859/97084/105883.docx
LA English
DT Article
DE ;Arctic coastal ecosystems;bivalve;climate change;energy reserves;fatty acids;homeoviscous adaptation;meltwater inputs;metabolic rate depression
AB 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. 
PY 2023
PD NOV
SO Ecology And Evolution
SN 2045-7758
PU Wiley
VL 13
IS 11
UT 001096816200001
DI 10.1002/ece3.10691
ID 97084
ER

EF