Photoperiodism and overwintering in boreal and sub-Arctic Calanus finmarchicus populations
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. The copepod Calanus finmarchicus, a key species in the North Atlantic, generally...
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ftunivdelaware:oai:udspace.udel.edu:19716/33324 2023-10-29T02:32:48+01:00 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 application/pdf https://udspace.udel.edu/handle/19716/33324 en_US eng Marine Ecology Progress Series 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 1616-1599 https://udspace.udel.edu/handle/19716/33324 locomotor activity latitudinal seasonality lipid overwintering zooplankton Article 2023 ftunivdelaware https://doi.org/10.3354/meps14307 2023-10-01T16:48:35Z 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. 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. Acknowledgements. We appreciate the support of the ... Article in Journal/Newspaper Arctic Arctic Calanus finmarchicus North Atlantic Zooplankton The University of Delaware Library Institutional Repository Marine Ecology Progress Series 712 49 65 |
institution |
Open Polar |
collection |
The University of Delaware Library Institutional Repository |
op_collection_id |
ftunivdelaware |
language |
English |
topic |
locomotor activity latitudinal seasonality lipid overwintering zooplankton |
spellingShingle |
locomotor activity latitudinal seasonality lipid overwintering zooplankton 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 |
topic_facet |
locomotor activity latitudinal seasonality lipid overwintering zooplankton |
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. 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. Acknowledgements. We appreciate the support of the ... |
format |
Article in Journal/Newspaper |
author |
Coguiec, Estelle Last, Kim S. Cohen, Jonathan H. Hobbs, Laura Choquet, Marvin Ershova, Elizaveta Berge, Jørgen Daase, Malin |
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 |
Marine Ecology Progress Series |
publishDate |
2023 |
url |
https://udspace.udel.edu/handle/19716/33324 |
genre |
Arctic Arctic Calanus finmarchicus North Atlantic Zooplankton |
genre_facet |
Arctic Arctic Calanus finmarchicus North Atlantic Zooplankton |
op_relation |
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 1616-1599 https://udspace.udel.edu/handle/19716/33324 |
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_ |
1781054745117458432 |