Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic
High latitude marine ecosystems experience strong seasonality in incoming light and thus food availability. The ongoing reduction in sea ice thickness and extent will change the underwater light climate significantly in the Arctic. Herbivorous calanoid copepods of the genus Calanus of northern highe...
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ftawi:oai:epic.awi.de:32511 2024-09-15T17:50:09+00:00 Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic Freese, Daniela Niehoff, Barbara Søreide, J. E. 2013-01-24 https://epic.awi.de/id/eprint/32511/ https://hdl.handle.net/10013/epic.41541 unknown Freese, D. , Niehoff, B. and Søreide, J. E. (2013) Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic , Arctic Frontiers, Tromsø, Norway, 20 January 2013 - 25 January 2013 . hdl:10013/epic.41541 EPIC3Arctic Frontiers, Tromsø, Norway, 2013-01-20-2013-01-25 Conference notRev 2013 ftawi 2024-06-24T04:06:16Z High latitude marine ecosystems experience strong seasonality in incoming light and thus food availability. The ongoing reduction in sea ice thickness and extent will change the underwater light climate significantly in the Arctic. Herbivorous calanoid copepods of the genus Calanus of northern higher latitudes are considered to endure times of unfavorable environmental conditions in a state of arrested development, referred to as diapause. However, to date we have very limited knowledge regarding the overwintering physiology and adaptability of Calanus spp. to changes in external cues like light and food. To study potential impacts of changes in the light and primary production regime on Calanus spp. in the Arctic, we measured enzymatic response and biochemical composition of Calanus glacialis copepodite stage V to presence or absence of food (Thalassiosira spp.) and light in winter (November 2009) and summer (July 2010). In situ proteinase and lipase/esterase activity was 10 times and 19 times higher, respectively, while metabolic activity (citrate synthase, CS) was twice as high for C. glacialis CV in summer compared to winter, suggesting that individuals collected at depth in winter had reduced activity and were in an overwintering state. Food availability amplified digestive activity in both seasons, while light had a minor effect in comparison. In winter, gel electrophoresis revealed a change in enzyme pattern over the three weeks of incubation, indicating that feeding induced enzyme expression. Green guts in approximately 90% of fed individuals at the end of the experiment supported that they were actively feeding. However, there was no significant increase in dry mass or carbon and nitrogen content in feeding individuals during the winter experiment. These results suggest that factors other than food and light must be involved in controlling the transition from diapauses to activity in C. glacialis, which is currently under investigation. Understanding the consequences of shifting environmental parameters ... Conference Object Arctic Calanus glacialis Sea ice Copepods Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
High latitude marine ecosystems experience strong seasonality in incoming light and thus food availability. The ongoing reduction in sea ice thickness and extent will change the underwater light climate significantly in the Arctic. Herbivorous calanoid copepods of the genus Calanus of northern higher latitudes are considered to endure times of unfavorable environmental conditions in a state of arrested development, referred to as diapause. However, to date we have very limited knowledge regarding the overwintering physiology and adaptability of Calanus spp. to changes in external cues like light and food. To study potential impacts of changes in the light and primary production regime on Calanus spp. in the Arctic, we measured enzymatic response and biochemical composition of Calanus glacialis copepodite stage V to presence or absence of food (Thalassiosira spp.) and light in winter (November 2009) and summer (July 2010). In situ proteinase and lipase/esterase activity was 10 times and 19 times higher, respectively, while metabolic activity (citrate synthase, CS) was twice as high for C. glacialis CV in summer compared to winter, suggesting that individuals collected at depth in winter had reduced activity and were in an overwintering state. Food availability amplified digestive activity in both seasons, while light had a minor effect in comparison. In winter, gel electrophoresis revealed a change in enzyme pattern over the three weeks of incubation, indicating that feeding induced enzyme expression. Green guts in approximately 90% of fed individuals at the end of the experiment supported that they were actively feeding. However, there was no significant increase in dry mass or carbon and nitrogen content in feeding individuals during the winter experiment. These results suggest that factors other than food and light must be involved in controlling the transition from diapauses to activity in C. glacialis, which is currently under investigation. Understanding the consequences of shifting environmental parameters ... |
format |
Conference Object |
author |
Freese, Daniela Niehoff, Barbara Søreide, J. E. |
spellingShingle |
Freese, Daniela Niehoff, Barbara Søreide, J. E. Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic |
author_facet |
Freese, Daniela Niehoff, Barbara Søreide, J. E. |
author_sort |
Freese, Daniela |
title |
Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic |
title_short |
Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic |
title_full |
Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic |
title_fullStr |
Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic |
title_full_unstemmed |
Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic |
title_sort |
effects of food and light on the physiology of calanus glacialis during different seasons in the arctic |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/32511/ https://hdl.handle.net/10013/epic.41541 |
genre |
Arctic Calanus glacialis Sea ice Copepods |
genre_facet |
Arctic Calanus glacialis Sea ice Copepods |
op_source |
EPIC3Arctic Frontiers, Tromsø, Norway, 2013-01-20-2013-01-25 |
op_relation |
Freese, D. , Niehoff, B. and Søreide, J. E. (2013) Effects of food and light on the physiology of Calanus glacialis during different seasons in the Arctic , Arctic Frontiers, Tromsø, Norway, 20 January 2013 - 25 January 2013 . hdl:10013/epic.41541 |
_version_ |
1810291999887065088 |