Supplementary material from "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"
Posted on 2020-07-01 - 18:30
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 600 m 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 ecosystems'.
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Olivier, Frédéric; Gaillard, Blandine; Thébault, Julien; Meziane, Tarik; Tremblay, Réjean; Dumont, Dany; et al. (2020). Supplementary material from "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". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.5046645.v1
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AUTHORS (17)
FO
Frédéric Olivier
BG
Blandine Gaillard
JT
Julien Thébault
TM
Tarik Meziane
RT
Réjean Tremblay
DD
Dany Dumont
SB
Simon Bélanger
MG
Michel Gosselin
AJ
Aurélie Jolivet
LC
Laurent Chauvaud
AM
André L. Martel
SR
Søren Rysgaard
AO
Anne-Hélène Olivier
JP
Julien Pettré
JM
Jérôme Mars
SG
Silvain Gerber
PA
Philippe Archambault