Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations
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 belo...
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Online Access: | https://hdl.handle.net/10037/29515 https://doi.org/10.3354/meps14307 |
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ftunivtroemsoe:oai:munin.uit.no:10037/29515 2023-07-16T03:55:18+02:00 Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations Coguiec, Estelle Last, Kim S. Cohen, Jonathan H. Hobbs, Laura Choquet, Marvin Ershova, Elizaveta Berge, Jørgen Daase, Malin 2023-06-08 https://hdl.handle.net/10037/29515 https://doi.org/10.3354/meps14307 eng eng Inter Research MEPS Coguiec, Last, Cohen, Hobbs, Choquet, Ershova, Berge, Daase. Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations. MEPS. 2023 FRIDAID 2155291 doi:10.3354/meps14307 https://hdl.handle.net/10037/29515 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 Inter-Research https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed acceptedVersion 2023 ftunivtroemsoe https://doi.org/10.3354/meps14307 2023-06-28T23:06:34Z 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. Article in Journal/Newspaper Arctic Arctic Calanus finmarchicus North Atlantic University of Tromsø: Munin Open Research Archive Arctic Ramfjord ENVELOPE(11.589,11.589,64.910,64.910) Marine Ecology Progress Series 712 49 65 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Coguiec, Estelle Last, Kim S. Cohen, Jonathan H. Hobbs, Laura Choquet, Marvin Ershova, Elizaveta Berge, Jørgen Daase, Malin |
spellingShingle |
Coguiec, Estelle Last, Kim S. Cohen, Jonathan H. Hobbs, Laura Choquet, Marvin Ershova, Elizaveta Berge, Jørgen Daase, Malin Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations |
author_facet |
Coguiec, Estelle Last, Kim S. Cohen, Jonathan H. Hobbs, Laura Choquet, Marvin Ershova, Elizaveta Berge, Jørgen Daase, Malin |
author_sort |
Coguiec, Estelle |
title |
Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations |
title_short |
Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations |
title_full |
Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations |
title_fullStr |
Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations |
title_full_unstemmed |
Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations |
title_sort |
photoperiodism and overwintering in boreal and sub-arctic calanus finmarchicus populations |
publisher |
Inter Research |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/29515 https://doi.org/10.3354/meps14307 |
long_lat |
ENVELOPE(11.589,11.589,64.910,64.910) |
geographic |
Arctic Ramfjord |
geographic_facet |
Arctic Ramfjord |
genre |
Arctic Arctic Calanus finmarchicus North Atlantic |
genre_facet |
Arctic Arctic Calanus finmarchicus North Atlantic |
op_relation |
MEPS Coguiec, Last, Cohen, Hobbs, Choquet, Ershova, Berge, Daase. Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations. MEPS. 2023 FRIDAID 2155291 doi:10.3354/meps14307 https://hdl.handle.net/10037/29515 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 Inter-Research https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.3354/meps14307 |
container_title |
Marine Ecology Progress Series |
container_volume |
712 |
container_start_page |
49 |
op_container_end_page |
65 |
_version_ |
1771541666519318528 |