Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations
| Author(s) | Coguiec, Estelle | |
| Author(s) | Last, Kim S. | |
| Author(s) | Cohen, Jonathan H. | |
| Author(s) | Hobbs, Laura | |
| Author(s) | Choquet, Marvin | |
| Author(s) | Ershova, Elizaveta | |
| Author(s) | Berge, Jørgen | |
| Author(s) | Daase, Malin | |
| Date Accessioned | 2023-09-27T13:19:17Z | |
| Date Available | 2023-09-27T13:19:17Z | |
| Publication Date | 2023-06-08 | |
| Description | This article was originally published in Marine Ecology Progress Series. The version of record is available at: https://doi.org/10.3354/meps14307. © Inter-Research 2023. This article will be embargoed until 06/08/2028. | |
| Abstract | The copepod Calanus finmarchicus, a key species in the North Atlantic, generally spends the non-productive season by descending into deep waters and entering diapause, a physiological state characterized by reduced metabolism and arrested development. In the open ocean, overwintering depths are below 600 m, where temperature and light conditions are favourable to initiate diapause. However, C. finmarchicus has also been reported diapausing in areas with shallow water depth such as fjords, coastal waters and shelf seas. In these environments, the temperature and light conditions are different, and it has been hypothesized that under such conditions C. finmarchicus may remain active throughout winter. Here, we investigated changes in the swimming activity of C. finmarchicus from shallow fjords in the eastern North Atlantic during overwintering in response to ambient photoperiod. We conducted monthly experiments with populations from 2 fjords from different latitudes (sub-Arctic Ramfjord, 69°N and boreal Loch Etive, 56°N), measuring the locomotor activity of individual C. finmarchicus stage CVs exposed to a natural light:dark cycle. At both locations, peaks in activity in response to the light cycle were observed to shift from nocturnal during the early overwintering phase to diurnal during mid and late overwintering phase, with a minimal intensity observed during the mid-overwintering phase. In Ramfjord, activity and rhythmicity were generally lower than in Loch Etive. We conclude that C. finmarchicus remains active throughout its overwintering period when in shallow (<200 m) locations but down-regulates its locomotor activity during the main overwintering phase, which we describe as a winter resting state as distinct from classical diapause. | |
| Sponsor | Acknowledgements. We appreciate the support of the captains and crew of RV ‘Hyas’ and ‘Seòl Mara’ during the fieldwork in Ramfjord and Loch Etive. Funding was provided by the following: CHASE project (NE/R012733/1), part of the Changing Arctic Ocean (CAO) program, jointly funded by the UKRI Natural Environment Research Council (NERC) and the German Federal Ministry of Education and Research (BMBF); The Marine Alliance for Science and Technology for Scotland (MASTS) pooling initiative, which is funded by the Scottish Funding Council (grant reference HR09011); ‘CalAct’ funded by Sentinel Nord through the Université Laval / University of Tromsø research partnership; and by the Norwegian Research Council through the projects Arctic ABC (project no 244319) and Deep Impact (project no 300333). This study is a contribution to the ARCTOS research network (arctos.uit.no). E.E. was partially supported by Research Council of Norway (norges forskningsråd) through the CoastRisk initiative (NFR 299554/F40). | |
| Citation | Coguiec E, Last KS, Cohen JH, Hobbs L and others (2023) Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations. Mar Ecol Prog Ser 712:49-65. https://doi.org/10.3354/meps14307 | |
| ISSN | 1616-1599 | |
| URL | https://udspace.udel.edu/handle/19716/33324 | |
| Language | en_US | |
| Publisher | Marine Ecology Progress Series | |
| Keywords | locomotor activity | |
| Keywords | latitudinal seasonality | |
| Keywords | lipid | |
| Keywords | overwintering | |
| Keywords | zooplankton | |
| Title | Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations | |
| Type | Article |
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