Study of the circadian and seasonal clocks of the scallop Chlamys islandica and the mussel Mytilus edulis living in the high Arctic. (ARCTICLOCK 2)

Objective of the current project is to deploy two biosensor HFNI valvometer to record valve behavior of bivalves. We wish to install our new device in the Kongsfjorden near Ny-Alesund for long-term monitoring (2-3 ans).

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Project type

  • field work
  • long-term monitoring


  • marine biology

Project Keywords

  • oceans / marine biology / marine invertebrates

Fieldwork information

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This project is following a previous IPEV project in 2017 (RIS 10514) and it is a part of the ANR project WAQMOS (2015-2020). The aims is to study, through a chronobiological approach, the clockwork of the Arctic scallop Chlamys islandica and as well the mussel Mytilus edulis, especially during the polar night. The scientific context of this project, supported by recent studies, is that polar night could be associated to a time of high biological activity in marine organisms, although the prevailing paradigm suggests the opposite situation with the presence of biological quiescence during polar night ,. We have already shown that the circadian rhythm of valve behavior is maintained even through the polar night. In the present project, we propose to study: a) Endogenous mechanisms underlying the circadian rhythm; b) Their synchronization by light intensity variations; c) the circannual rhythm. The molecular clockwork will be investigate in relationship with the valve behavior and the growth of bivalves. Finally, this study will be put into perspective to exacerbated global warming at the poles, which modify the life cycles between the bivalves and their food availability such as the phytoplankton.

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