Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen
The high Arctic Kongsfjorden (79°N) is influenced mainly 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 found regularly in Kongs...
Main Authors: | , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2013
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/34395/ https://hdl.handle.net/10013/epic.42653 |
id |
ftawi:oai:epic.awi.de:34395 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:34395 2024-09-09T19:21:24+00:00 Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen Hünerlage, Kim Cascella, Kévin Toullec, Jean-Yves Buchholz, Friedrich 2013-11-09 https://epic.awi.de/id/eprint/34395/ https://hdl.handle.net/10013/epic.42653 unknown Hünerlage, K. , Cascella, K. , Toullec, J. Y. and Buchholz, F. (2013) Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen , CEPA - Colloque d'EcoPhysiologie Animale, Lyon, France, 7 November 2013 - 9 November 2013 . hdl:10013/epic.42653 EPIC3CEPA - Colloque d'EcoPhysiologie Animale, Lyon, France, 2013-11-07-2013-11-09 Conference notRev 2013 ftawi 2024-06-24T04:08:32Z The high Arctic Kongsfjorden (79°N) is influenced mainly 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 found regularly in Kongsfjorden – in addition to the previously prevailing arcto-boreal species Thysanoessa inermis and T. raschii. Generally, krill occupy a central trophic position as secondary producers linking primary production to higher trophic levels. Many adult fish, seabirds and marine mammals rely on them as a food source. 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. We aim at determining the ecophysiology of this key group within the challenging Arctic ecosystem. Using non-invasive optical oxygen sensors, respiration measurements helped to characterize the species’ metabolic reaction to temperature variation, i.e. to reveal the thermal limits of metabolic adaptability. Thysanoessa spp. appear more stenotherm than the boreal and the subtropical krill species: the upper level of respiration is reached at temperatures < 12°C while mortality increases and the animals are less tolerant to ambient oxygen concentrations. The species’ thermal limit of adaptive capacity found may explain its current arcto-boreal distribution. In contrast, the other boreal and a subtropical 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. Accordingly, at least one of the latter species may profit from the increasing “Atlantification” of the Kongsfjord ecosystem due to its superior physiological plasticity. Conference Object 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) |
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 |
The high Arctic Kongsfjorden (79°N) is influenced mainly 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 found regularly in Kongsfjorden – in addition to the previously prevailing arcto-boreal species Thysanoessa inermis and T. raschii. Generally, krill occupy a central trophic position as secondary producers linking primary production to higher trophic levels. Many adult fish, seabirds and marine mammals rely on them as a food source. 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. We aim at determining the ecophysiology of this key group within the challenging Arctic ecosystem. Using non-invasive optical oxygen sensors, respiration measurements helped to characterize the species’ metabolic reaction to temperature variation, i.e. to reveal the thermal limits of metabolic adaptability. Thysanoessa spp. appear more stenotherm than the boreal and the subtropical krill species: the upper level of respiration is reached at temperatures < 12°C while mortality increases and the animals are less tolerant to ambient oxygen concentrations. The species’ thermal limit of adaptive capacity found may explain its current arcto-boreal distribution. In contrast, the other boreal and a subtropical 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. Accordingly, at least one of the latter species may profit from the increasing “Atlantification” of the Kongsfjord ecosystem due to its superior physiological plasticity. |
format |
Conference Object |
author |
Hünerlage, Kim Cascella, Kévin Toullec, Jean-Yves Buchholz, Friedrich |
spellingShingle |
Hünerlage, Kim Cascella, Kévin Toullec, Jean-Yves Buchholz, Friedrich Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen |
author_facet |
Hünerlage, Kim Cascella, Kévin Toullec, Jean-Yves Buchholz, Friedrich |
author_sort |
Hünerlage, Kim |
title |
Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen |
title_short |
Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen |
title_full |
Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen |
title_fullStr |
Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen |
title_full_unstemmed |
Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen |
title_sort |
thermal constraints on the metabolic rates of krill from kongsfjorden, west-spitsbergen |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/34395/ https://hdl.handle.net/10013/epic.42653 |
long_lat |
ENVELOPE(29.319,29.319,70.721,70.721) |
geographic |
Arctic Kongsfjord |
geographic_facet |
Arctic Kongsfjord |
genre |
Arctic Climate change Kongsfjord* Kongsfjorden Spitsbergen Thysanoessa inermis |
genre_facet |
Arctic Climate change Kongsfjord* Kongsfjorden Spitsbergen Thysanoessa inermis |
op_source |
EPIC3CEPA - Colloque d'EcoPhysiologie Animale, Lyon, France, 2013-11-07-2013-11-09 |
op_relation |
Hünerlage, K. , Cascella, K. , Toullec, J. Y. and Buchholz, F. (2013) Thermal constraints on the metabolic rates of krill from Kongsfjorden, West-Spitsbergen , CEPA - Colloque d'EcoPhysiologie Animale, Lyon, France, 7 November 2013 - 9 November 2013 . hdl:10013/epic.42653 |
_version_ |
1809761605516263424 |