Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic
In the Arctic shelf seas, the mesozooplankton biomass is dominated by the arctic copepod Calanus glacialis, but its boreal congeneric C. finmarchicus is expanding northwards. Even though it is already there, C. finmarchicus may not be able to truly establish itself in the Arctic seas and potentially...
Published in: | Frontiers in Marine Science |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Frontiers Media S.A.
2022
|
Subjects: | |
Online Access: | https://doi.org/10.3389/fmars.2022.877904 https://doaj.org/article/ec22ec819fe548aabb82e8f564fd6179 |
id |
ftdoajarticles:oai:doaj.org/article:ec22ec819fe548aabb82e8f564fd6179 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:ec22ec819fe548aabb82e8f564fd6179 2023-05-15T14:30:34+02:00 Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic Maja Hatlebakk Barbara Niehoff Marvin Choquet Haakon Hop Anette Wold Galice Hoarau Janne E. Søreide 2022-06-01T00:00:00Z https://doi.org/10.3389/fmars.2022.877904 https://doaj.org/article/ec22ec819fe548aabb82e8f564fd6179 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.877904/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.877904 https://doaj.org/article/ec22ec819fe548aabb82e8f564fd6179 Frontiers in Marine Science, Vol 9 (2022) calanoid copepods overwintering metabolism enzyme activities Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2022 ftdoajarticles https://doi.org/10.3389/fmars.2022.877904 2022-12-30T21:37:29Z In the Arctic shelf seas, the mesozooplankton biomass is dominated by the arctic copepod Calanus glacialis, but its boreal congeneric C. finmarchicus is expanding northwards. Even though it is already there, C. finmarchicus may not be able to truly establish itself in the Arctic seas and potentially replace C. glacialis. We compared metabolic and digestive enzyme activities of sympatric C. glacialis and C. finmarchicus from Isfjorden, Svalbard and off-shelf north of Svalbard. The seasonal regulation of anabolic and catabolic enzyme activities was generally similar for the two species, but with some interspecific differences corresponding to their ontogeny. Wake-up from overwintering started earlier in adults of C. glacialis than in C. finmarchicus, while the onset of dormancy started early in the overwintering stages of both species. Furthermore, C. glacialis showed an earlier and higher mobilization of lipase enzyme activities, indicating higher efficiency in assimilating dietary lipids compared to C. finmarchicus. Similar population sizes and population structures for C. finmarchicus off-shelf north of Svalbard and in Isfjorden support a similar origin. Still, C. finmarchicus was able to match regulation of enzyme activities to the bloom even though the bloom peaked approximately a month later off-shelf north of Svalbard, indicating that food availability is an important signal for the final step of termination of diapause. Even though the two species largely follow the same patterns of metabolic enzyme activities, the more efficient lipid anabolism of C. glacialis may give it an advantage over C. finmarchicus in high-Arctic unpredictable environments with short-pulsed primary production regimes. Article in Journal/Newspaper Arctic copepod Arctic Calanus glacialis Isfjord* Isfjorden Svalbard Copepods Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
calanoid copepods overwintering metabolism enzyme activities Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
calanoid copepods overwintering metabolism enzyme activities Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 Maja Hatlebakk Barbara Niehoff Marvin Choquet Haakon Hop Anette Wold Galice Hoarau Janne E. Søreide Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic |
topic_facet |
calanoid copepods overwintering metabolism enzyme activities Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
In the Arctic shelf seas, the mesozooplankton biomass is dominated by the arctic copepod Calanus glacialis, but its boreal congeneric C. finmarchicus is expanding northwards. Even though it is already there, C. finmarchicus may not be able to truly establish itself in the Arctic seas and potentially replace C. glacialis. We compared metabolic and digestive enzyme activities of sympatric C. glacialis and C. finmarchicus from Isfjorden, Svalbard and off-shelf north of Svalbard. The seasonal regulation of anabolic and catabolic enzyme activities was generally similar for the two species, but with some interspecific differences corresponding to their ontogeny. Wake-up from overwintering started earlier in adults of C. glacialis than in C. finmarchicus, while the onset of dormancy started early in the overwintering stages of both species. Furthermore, C. glacialis showed an earlier and higher mobilization of lipase enzyme activities, indicating higher efficiency in assimilating dietary lipids compared to C. finmarchicus. Similar population sizes and population structures for C. finmarchicus off-shelf north of Svalbard and in Isfjorden support a similar origin. Still, C. finmarchicus was able to match regulation of enzyme activities to the bloom even though the bloom peaked approximately a month later off-shelf north of Svalbard, indicating that food availability is an important signal for the final step of termination of diapause. Even though the two species largely follow the same patterns of metabolic enzyme activities, the more efficient lipid anabolism of C. glacialis may give it an advantage over C. finmarchicus in high-Arctic unpredictable environments with short-pulsed primary production regimes. |
format |
Article in Journal/Newspaper |
author |
Maja Hatlebakk Barbara Niehoff Marvin Choquet Haakon Hop Anette Wold Galice Hoarau Janne E. Søreide |
author_facet |
Maja Hatlebakk Barbara Niehoff Marvin Choquet Haakon Hop Anette Wold Galice Hoarau Janne E. Søreide |
author_sort |
Maja Hatlebakk |
title |
Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic |
title_short |
Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic |
title_full |
Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic |
title_fullStr |
Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic |
title_full_unstemmed |
Seasonal Enzyme Activities of Sympatric Calanus glacialis and C. finmarchicus in the High-Arctic |
title_sort |
seasonal enzyme activities of sympatric calanus glacialis and c. finmarchicus in the high-arctic |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.877904 https://doaj.org/article/ec22ec819fe548aabb82e8f564fd6179 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic copepod Arctic Calanus glacialis Isfjord* Isfjorden Svalbard Copepods |
genre_facet |
Arctic copepod Arctic Calanus glacialis Isfjord* Isfjorden Svalbard Copepods |
op_source |
Frontiers in Marine Science, Vol 9 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.877904/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.877904 https://doaj.org/article/ec22ec819fe548aabb82e8f564fd6179 |
op_doi |
https://doi.org/10.3389/fmars.2022.877904 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1766304389651234816 |