A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause.
Knowledge on the capability of zooplankton to adapt to the rapidly changing environmental conditions in the Arctic is crucial to predict future ecosystem processes. The key species on the Arctic shelf, the calanoid copepod Calanus glacialis, grows and accumulates lipid reserves in spring and summer...
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ftawi:oai:epic.awi.de:44877 2024-09-15T17:51:22+00:00 A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. Freese, Daniela Søreide, J. E. Graeve, Martin Niehoff, Barbara 2017 https://epic.awi.de/id/eprint/44877/ https://hdl.handle.net/10013/epic.51148 unknown SPRINGER Freese, D. , Søreide, J. E. , Graeve, M. orcid:0000-0002-2294-1915 and Niehoff, B. (2017) A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. , Marine Biology, 164 (3), pp. 1-12 . doi:10.1007/s00227-016-3036-2 <https://doi.org/10.1007/s00227-016-3036-2> , hdl:10013/epic.51148 EPIC3Marine Biology, SPRINGER, 164(3), pp. 1-12, ISSN: 0025-3162 Article isiRev 2017 ftawi https://doi.org/10.1007/s00227-016-3036-2 2024-06-24T04:17:43Z Knowledge on the capability of zooplankton to adapt to the rapidly changing environmental conditions in the Arctic is crucial to predict future ecosystem processes. The key species on the Arctic shelf, the calanoid copepod Calanus glacialis, grows and accumulates lipid reserves in spring and summer in surface waters. The winter is spent in dormancy in deeper water layers with low metabolic activity. As timing and intensity of metabolic changes have been poorly investigated, our study aims to characterize the physiology of C. glacialis over an entire year, from July 2012 to July 2013. We followed anabolic and catabolic enzyme activities and the biochemical composition of this species, taking depth-stratified samples once a month in Billefjorden, a high-Arctic sill fjord. A large part of the population had migrated to depths >100 m by July 2012. Only thereafter, anabolic activities decreased slowly, suggesting that low metabolism is related to ceased feeding rather than to endogenous regulation. During overwintering, anabolic enzyme activities were reduced by half as compared to peak activities in spring. The biochemical composition of the copepods changed little from July to December. Then, the lipid catabolic activity increased and the lipid content decreased, likely fuelling moulting and gonad maturation. The protein content did not change significantly during winter, suggesting that proteins are not much catabolized during that time. The relatively high metabolic activity in C. glacialis in winter suggests that this species is not entering a true diapause and should thus be able to respond flexible to changing environmental conditions. Article in Journal/Newspaper Arctic Arctic copepod Billefjorden Calanus glacialis Zooplankton Copepods Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Marine Biology 164 1 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Knowledge on the capability of zooplankton to adapt to the rapidly changing environmental conditions in the Arctic is crucial to predict future ecosystem processes. The key species on the Arctic shelf, the calanoid copepod Calanus glacialis, grows and accumulates lipid reserves in spring and summer in surface waters. The winter is spent in dormancy in deeper water layers with low metabolic activity. As timing and intensity of metabolic changes have been poorly investigated, our study aims to characterize the physiology of C. glacialis over an entire year, from July 2012 to July 2013. We followed anabolic and catabolic enzyme activities and the biochemical composition of this species, taking depth-stratified samples once a month in Billefjorden, a high-Arctic sill fjord. A large part of the population had migrated to depths >100 m by July 2012. Only thereafter, anabolic activities decreased slowly, suggesting that low metabolism is related to ceased feeding rather than to endogenous regulation. During overwintering, anabolic enzyme activities were reduced by half as compared to peak activities in spring. The biochemical composition of the copepods changed little from July to December. Then, the lipid catabolic activity increased and the lipid content decreased, likely fuelling moulting and gonad maturation. The protein content did not change significantly during winter, suggesting that proteins are not much catabolized during that time. The relatively high metabolic activity in C. glacialis in winter suggests that this species is not entering a true diapause and should thus be able to respond flexible to changing environmental conditions. |
format |
Article in Journal/Newspaper |
author |
Freese, Daniela Søreide, J. E. Graeve, Martin Niehoff, Barbara |
spellingShingle |
Freese, Daniela Søreide, J. E. Graeve, Martin Niehoff, Barbara A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. |
author_facet |
Freese, Daniela Søreide, J. E. Graeve, Martin Niehoff, Barbara |
author_sort |
Freese, Daniela |
title |
A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. |
title_short |
A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. |
title_full |
A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. |
title_fullStr |
A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. |
title_full_unstemmed |
A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. |
title_sort |
year-round study on metabolic enzymes and body composition of the arctic copepod calanus glacialis: implications for the timing and intensity of diapause. |
publisher |
SPRINGER |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/44877/ https://hdl.handle.net/10013/epic.51148 |
genre |
Arctic Arctic copepod Billefjorden Calanus glacialis Zooplankton Copepods |
genre_facet |
Arctic Arctic copepod Billefjorden Calanus glacialis Zooplankton Copepods |
op_source |
EPIC3Marine Biology, SPRINGER, 164(3), pp. 1-12, ISSN: 0025-3162 |
op_relation |
Freese, D. , Søreide, J. E. , Graeve, M. orcid:0000-0002-2294-1915 and Niehoff, B. (2017) A year-round study on metabolic enzymes and body composition of the Arctic copepod Calanus glacialis: implications for the timing and intensity of diapause. , Marine Biology, 164 (3), pp. 1-12 . doi:10.1007/s00227-016-3036-2 <https://doi.org/10.1007/s00227-016-3036-2> , hdl:10013/epic.51148 |
op_doi |
https://doi.org/10.1007/s00227-016-3036-2 |
container_title |
Marine Biology |
container_volume |
164 |
container_issue |
1 |
_version_ |
1810293250348548096 |