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

被引：15

作者：

Olivier, Frederic ^{[1
,12
]}

Gaillard, Blandine ^{[2
]}

Thebault, Julien ^{[3
]}

Meziane, Tarik ^{[1
]}

Tremblay, Rejean ^{[2
]}

Dumont, Dany ^{[2
]}

Belanger, Simon ^{[4
]}

Gosselin, Michel ^{[2
]}

Jolivet, Aurelie ^{[3
,13
]}

Chauvaud, Laurent ^{[3
]}

Martel, Andre L. ^{[5
]}

Rysgaard, Soren ^{[6
,7
,8
]}

Olivier, Anne-Helene ^{[9
]}

Pettre, Julien ^{[9
]}

Mars, Jerome ^{[10
]}

Gerber, Silvain ^{[10
]}

Archambault, Philippe ^{[2
,11
]}

机构：

[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

来源：

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2020年 / 378卷 / 2181期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Arctic; climate change; sclerochronology; pelagic-benthic coupling; match; mismatch hypothesis; bivalve growth; HIGH-ARCTIC FJORD; COMMUNITY STRUCTURE; AGE VALIDATION; CLIMATE-CHANGE; SEA; GROWTH; PHYTOPLANKTON; PATTERNS; DYNAMICS; OCEAN;

D O I：

10.1098/rsta.2019.0353

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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'.

引用

页数：23

共 94 条

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