Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen
The high Arctic Kongsfjorden (79°N) is mainly influenced by cold Arctic but also warmer Atlantic water masses. In recent years, the proportion of Atlantic inflow increased, attributed to climate change. Concurrently, two boreal and one subtropical krill species are now being regularly found in Kongs...
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ftawi:oai:epic.awi.de:36158 2023-05-15T14:26:39+02:00 Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen Hünerlage, Kim Graeve, Martin Buchholz, Friedrich 2014-08-18 https://epic.awi.de/id/eprint/36158/ https://hdl.handle.net/10013/epic.44023 unknown Hünerlage, K. , Graeve, M. orcid:0000-0002-2294-1915 and Buchholz, F. (2014) Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen , 8th International Crustacean Congress (ICC-8), Frankfurt a. M., 18 August 2014 - 23 August 2014 . hdl:10013/epic.44023 EPIC38th International Crustacean Congress (ICC-8), Frankfurt a. M., 2014-08-18-2014-08-23Johann Wolfgang Goethe-Universität Conference notRev 2014 ftawi 2021-12-24T15:39:46Z The high Arctic Kongsfjorden (79°N) is mainly influenced by cold Arctic but also warmer Atlantic water masses. In recent years, the proportion of Atlantic inflow increased, attributed to climate change. Concurrently, two boreal and one subtropical krill species are now being regularly found in Kongsfjorden – in addition to the previously prevailing arcto-boreal species Thysanoessa inermis and T. raschii (Buchholz et al. 2010). Krill occupy a central trophic position in the pelagic food-web. Although a change in a krill population may have a significant impact on the ecosystem, knowledge on the physiological performance of the species inhabiting Arctic waters is still scarce. In our study we aim at investigating the thermal limits of metabolic adaptability and the allocation of energy reserves in order to predict each species’ potential to persist in this challenging environment, in which temperature and food supply are among the most important factors determining survival. Total lipid content and lipid class composition show remarkable differences between species, reflecting the specific adaptations to the environments of origin. Furthermore, Thysanoessa spp. appear more stenotherm than the boreal and the subtropical krill species: the upper level of respiration is reached at temperatures < 12°C (Fig. 1). The other krill species show a higher tolerance to temperature changes, which may support the species’ success in northward expansion as reported through increasing abundances at lower latitudes (e.g. Zhukova et al. 2009). Accordingly, at least one of the latter species may profit from the increasing “Atlantification” of the Kongsfjord ecosystem. In turn, due to the differences in biochemical composition, a change in species composition may result in significant changes in the marine food-web of Kongsfjorden - especially for higher trophic levels. Conference Object Arctic Arctic Climate change Kongsfjord* Kongsfjorden Spitsbergen Thysanoessa inermis Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Kongsfjord ENVELOPE(29.319,29.319,70.721,70.721) Zhukova ENVELOPE(44.721,44.721,65.534,65.534) |
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Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The high Arctic Kongsfjorden (79°N) is mainly influenced by cold Arctic but also warmer Atlantic water masses. In recent years, the proportion of Atlantic inflow increased, attributed to climate change. Concurrently, two boreal and one subtropical krill species are now being regularly found in Kongsfjorden – in addition to the previously prevailing arcto-boreal species Thysanoessa inermis and T. raschii (Buchholz et al. 2010). Krill occupy a central trophic position in the pelagic food-web. Although a change in a krill population may have a significant impact on the ecosystem, knowledge on the physiological performance of the species inhabiting Arctic waters is still scarce. In our study we aim at investigating the thermal limits of metabolic adaptability and the allocation of energy reserves in order to predict each species’ potential to persist in this challenging environment, in which temperature and food supply are among the most important factors determining survival. Total lipid content and lipid class composition show remarkable differences between species, reflecting the specific adaptations to the environments of origin. Furthermore, Thysanoessa spp. appear more stenotherm than the boreal and the subtropical krill species: the upper level of respiration is reached at temperatures < 12°C (Fig. 1). The other krill species show a higher tolerance to temperature changes, which may support the species’ success in northward expansion as reported through increasing abundances at lower latitudes (e.g. Zhukova et al. 2009). Accordingly, at least one of the latter species may profit from the increasing “Atlantification” of the Kongsfjord ecosystem. In turn, due to the differences in biochemical composition, a change in species composition may result in significant changes in the marine food-web of Kongsfjorden - especially for higher trophic levels. |
format |
Conference Object |
author |
Hünerlage, Kim Graeve, Martin Buchholz, Friedrich |
spellingShingle |
Hünerlage, Kim Graeve, Martin Buchholz, Friedrich Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen |
author_facet |
Hünerlage, Kim Graeve, Martin Buchholz, Friedrich |
author_sort |
Hünerlage, Kim |
title |
Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen |
title_short |
Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen |
title_full |
Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen |
title_fullStr |
Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen |
title_full_unstemmed |
Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen |
title_sort |
physiological performance of krill species from the high arctic kongsfjorden, w - spitsbergen |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/36158/ https://hdl.handle.net/10013/epic.44023 |
long_lat |
ENVELOPE(29.319,29.319,70.721,70.721) ENVELOPE(44.721,44.721,65.534,65.534) |
geographic |
Arctic Kongsfjord Zhukova |
geographic_facet |
Arctic Kongsfjord Zhukova |
genre |
Arctic Arctic Climate change Kongsfjord* Kongsfjorden Spitsbergen Thysanoessa inermis |
genre_facet |
Arctic Arctic Climate change Kongsfjord* Kongsfjorden Spitsbergen Thysanoessa inermis |
op_source |
EPIC38th International Crustacean Congress (ICC-8), Frankfurt a. M., 2014-08-18-2014-08-23Johann Wolfgang Goethe-Universität |
op_relation |
Hünerlage, K. , Graeve, M. orcid:0000-0002-2294-1915 and Buchholz, F. (2014) Physiological performance of krill species from the high Arctic Kongsfjorden, W - Spitsbergen , 8th International Crustacean Congress (ICC-8), Frankfurt a. M., 18 August 2014 - 23 August 2014 . hdl:10013/epic.44023 |
_version_ |
1766299927328063488 |