Shells of the bivalve Astarte moerchi give new evidence of a strong pelagic-benthic coupling shift occurring since the late 1970s in the North Water polynya

Type Article
Date 2020-10
Language English
Author(s) Olivier Frederic1, 12, Gaillard Blandine2, Thebault JulienORCID3, Meziane TarikORCID1, Tremblay Rejean2, Dumont DanyORCID2, Belanger Simon4, Gosselin Michel2, Jolivet AurelieORCID3, 13, Chauvaud Laurent3, Martel Andre L.5, Rysgaard Soren6, 7, 8, Olivier Anne-Helene9, Pettre Julien9, Mars Jerome10, Gerber Silvain10, Archambault Philippe2, 11
Affiliation(s) 1 : Univ Antilles, Univ Caen Normandie, Sorbonne Univ,CNRS,Inst Rech Dev 207, Museum Natl Hist Nat,Lab Biol Organismes & Ecosys, CP53,61 Rue Buffon, F-75005 Paris, France.
2 : Univ Quebec Rimouski, Inst Sci Mer Rimouski, 310 Allee Ursulines, Rimouski, PQ G5L 3A1, Canada.
3 : Univ Bretagne Occidentale, Unite Mixte Rech Lab Sci Environm Marin LEMAR, UMR 6539, Inst Rech Dev,CNRS,Inst Univ Europeen Mer, Technopole Brest Iroise,Rue Dumont Urville, F-29280 Plouzane, France.
4 : Univ Quebec Rimouski, Dept Biol Chim & Geog, Quebec Oceans & BOREAS, 300 Allee Ursulines, Rimouski, PQ G5L 3A1, Canada.
5 : Canadian Museum Nat, Zool Sect Malacol, POB 3443,Stn D, Ottawa, ON K1P 6P4, Canada.
6 : Greenland Climate Res Ctr, Greenland Inst Nat Resources, Kivioq 2,POB 570, Nuuk 3900, Greenland.
7 : Univ Manitoba, CHR Fac Environm Earth & Resources, Ctr Earth Observat Sci, 499 Wallace Bldg, Winnipeg, MB R3T 2N2, Canada.
8 : Aarhus Univ, Arctic Res Ctr, CF Mollers Alle 8, DK-8000 Aarhus C, Denmark.
9 : Univ Rennes, M2S, IRISA, CNRS,Inria, F-35000 Rennes, France.
10 : CNRS, Grenoble INP, GIPSA Lab, Grenoble Alpes, F-38000 Grenoble, France.
11 : Univ Laval, Dept Biol, Quebec Oceans, Takuvik,Arcticnet, 1045 Ave Med, Laval, PQ G1V 0A6, Canada.
12 : MNHN, Stn Marine Concarneau, Pl Croix BP 225, F-29182 Concarneau, France.
13 : TBM Environm SOMME, 2 Rue Suede,Bloc 03, F-56000 Auray, France.
Source Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences (1364-503X) (Royal Soc), 2020-10 , Vol. 378 , N. 2181 , P. 20190353 (23p.)
DOI 10.1098/rsta.2019.0353
WOS© Times Cited 4
Keyword(s) Arctic, climate change, sclerochronology, pelagic-benthic coupling, match, mismatch hypothesis, bivalve growth
Abstract

Climate changes in the Arctic may weaken the currently tight pelagic-benthic coupling. In response to decreasing sea ice cover, arctic marine systems are expected to shift from a 'sea-ice algae-benthos' to a 'phytoplankton-zooplankton' dominance. We used mollusc shells as bioarchives and fatty acid trophic markers to estimate the effects of the reduction of sea ice cover on the food exported to the seafloor. Bathyal bivalve Astarte moerchi living at 600m depth in northern Baffin Bay reveals a clear shift in growth variations and Ba/Ca ratios since the late 1970s, which we relate to a change in food availability. Tissue fatty acid compositions show that this species feeds mainly on microalgae exported from the euphotic zone to the seabed. We, therefore, suggest that changes in pelagic-benthic coupling are likely due either to local changes in sea ice dynamics, mediated through bottom-up regulation exerted by sea ice on phytoplankton production, or to a mismatch between phytoplankton bloom and zooplankton grazing due to phenological change. Both possibilities allow a more regular and increased transfer of food to the seabed. This article is part of the theme issue 'The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning'.

Full Text
File Pages Size Access
Publisher's official version 23 1 MB Open access
Supplemental Material 2 MB Open access
Top of the page

How to cite 

Olivier Frederic, Gaillard Blandine, Thebault Julien, Meziane Tarik, Tremblay Rejean, Dumont Dany, Belanger Simon, Gosselin Michel, Jolivet Aurelie, Chauvaud Laurent, Martel Andre L., Rysgaard Soren, Olivier Anne-Helene, Pettre Julien, Mars Jerome, Gerber Silvain, Archambault Philippe (2020). Shells of the bivalve Astarte moerchi give new evidence of a strong pelagic-benthic coupling shift occurring since the late 1970s in the North Water polynya. Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences, 378(2181), 20190353 (23p.). Publisher's official version : https://doi.org/10.1098/rsta.2019.0353 , Open Access version : https://archimer.ifremer.fr/doc/00686/79854/