Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014
The kelp Alaria esculenta represents a key species in high Arctic marine fjord ecosystems. However, the European Arctic is currently experiencing extensive environmental change. Glacial fjord systems, such as Kongsfjorden (Spitsbergen, Svalbard), are subjected to rising temperature, increased freshw...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.894853 2023-05-15T14:25:24+02:00 Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014 Springer, Karin Lütz, Cornelius Lütz-Meindl, Ursula Wendt, Angela Bischof, Kai LATITUDE: 78.916670 * LONGITUDE: 11.933330 2018-09-27 text/tab-separated-values, 96 data points https://doi.pangaea.de/10.1594/PANGAEA.894853 https://doi.org/10.1594/PANGAEA.894853 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.894853 https://doi.org/10.1594/PANGAEA.894853 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Springer, Karin; Lütz, Cornelius; Lütz-Meindl, Ursula; Wendt, Angela; Bischof, Kai (2017): Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae). Phycologia, 56(6), 675-685, https://doi.org/10.2216/16-122.1 Antioxidant activity in Trolox Equivalents beta-Carotene Chlorophyll a Chlorophyll c1+c2 EXP Experiment Family Fucoxanthin Initial slope of rapid light curve KongsfjordenOA Light saturation point Maximal electron transport rate Maximum photochemical quantum yield of photosystem II Phlorotannins Ratio Species Treatment Violaxanthin plus Antheraxanthin plus Zeaxanthin Dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.894853 https://doi.org/10.2216/16-122.1 2023-01-20T09:11:37Z The kelp Alaria esculenta represents a key species in high Arctic marine fjord ecosystems. However, the European Arctic is currently experiencing extensive environmental change. Glacial fjord systems, such as Kongsfjorden (Spitsbergen, Svalbard), are subjected to rising temperature, increased freshwater inflow from glaciers and melting snow and a changing ultraviolet (UV) radiation regime related to stratospheric ozone depletion. Thus, in addition to natural seasonality, sessile organisms require acclimation in order to adapt to an environment in transition. We examined the physiological and ultrastructural responses of A. esculenta to the combined exposure to hyposalinity and UV radiation. Photosynthetic quantum yield slightly decreased during a low-salinity treatment of 7 d. Exposure to UV radiation also lowered quantum yield, but specimens previously treated with hyposalinity were significantly less susceptible to UV than nontreated individuals. Concomitant with a loss of chlorophyll during the hyposaline treatment, phlorotannin and antioxidant contents were maintained, and samples treated with low salinities exhibited higher UV-screening characteristics as demonstrated by significantly higher absorption ratios at 300/680 nm. Ultrastructural analyses revealed a treatment-dependent swelling of cell walls and accumulations of phlorotannin-containing vesicles. Our findings point to a strategy by which kelps apply a fast and cost-efficient redistribution of phlorotannins rather than increased synthesis as a general stress response to different environmental drivers in contrast to stress-specific responses. The notion that acclimation to one stressor (low salinity) reflects increased tolerance towards a second stressor (UV radiation) supports the concept of 'cross-acclimation' as established for higher plants but not yet for seaweeds. Dataset Arctic Arctic Kongsfjord* Kongsfjorden Svalbard Spitsbergen PANGAEA - Data Publisher for Earth & Environmental Science Arctic Svalbard ENVELOPE(11.933330,11.933330,78.916670,78.916670) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Antioxidant activity in Trolox Equivalents beta-Carotene Chlorophyll a Chlorophyll c1+c2 EXP Experiment Family Fucoxanthin Initial slope of rapid light curve KongsfjordenOA Light saturation point Maximal electron transport rate Maximum photochemical quantum yield of photosystem II Phlorotannins Ratio Species Treatment Violaxanthin plus Antheraxanthin plus Zeaxanthin |
spellingShingle |
Antioxidant activity in Trolox Equivalents beta-Carotene Chlorophyll a Chlorophyll c1+c2 EXP Experiment Family Fucoxanthin Initial slope of rapid light curve KongsfjordenOA Light saturation point Maximal electron transport rate Maximum photochemical quantum yield of photosystem II Phlorotannins Ratio Species Treatment Violaxanthin plus Antheraxanthin plus Zeaxanthin Springer, Karin Lütz, Cornelius Lütz-Meindl, Ursula Wendt, Angela Bischof, Kai Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014 |
topic_facet |
Antioxidant activity in Trolox Equivalents beta-Carotene Chlorophyll a Chlorophyll c1+c2 EXP Experiment Family Fucoxanthin Initial slope of rapid light curve KongsfjordenOA Light saturation point Maximal electron transport rate Maximum photochemical quantum yield of photosystem II Phlorotannins Ratio Species Treatment Violaxanthin plus Antheraxanthin plus Zeaxanthin |
description |
The kelp Alaria esculenta represents a key species in high Arctic marine fjord ecosystems. However, the European Arctic is currently experiencing extensive environmental change. Glacial fjord systems, such as Kongsfjorden (Spitsbergen, Svalbard), are subjected to rising temperature, increased freshwater inflow from glaciers and melting snow and a changing ultraviolet (UV) radiation regime related to stratospheric ozone depletion. Thus, in addition to natural seasonality, sessile organisms require acclimation in order to adapt to an environment in transition. We examined the physiological and ultrastructural responses of A. esculenta to the combined exposure to hyposalinity and UV radiation. Photosynthetic quantum yield slightly decreased during a low-salinity treatment of 7 d. Exposure to UV radiation also lowered quantum yield, but specimens previously treated with hyposalinity were significantly less susceptible to UV than nontreated individuals. Concomitant with a loss of chlorophyll during the hyposaline treatment, phlorotannin and antioxidant contents were maintained, and samples treated with low salinities exhibited higher UV-screening characteristics as demonstrated by significantly higher absorption ratios at 300/680 nm. Ultrastructural analyses revealed a treatment-dependent swelling of cell walls and accumulations of phlorotannin-containing vesicles. Our findings point to a strategy by which kelps apply a fast and cost-efficient redistribution of phlorotannins rather than increased synthesis as a general stress response to different environmental drivers in contrast to stress-specific responses. The notion that acclimation to one stressor (low salinity) reflects increased tolerance towards a second stressor (UV radiation) supports the concept of 'cross-acclimation' as established for higher plants but not yet for seaweeds. |
format |
Dataset |
author |
Springer, Karin Lütz, Cornelius Lütz-Meindl, Ursula Wendt, Angela Bischof, Kai |
author_facet |
Springer, Karin Lütz, Cornelius Lütz-Meindl, Ursula Wendt, Angela Bischof, Kai |
author_sort |
Springer, Karin |
title |
Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014 |
title_short |
Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014 |
title_full |
Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014 |
title_fullStr |
Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014 |
title_full_unstemmed |
Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae) - results of laboratory experiments at Kongsfjorden, June/July 2014 |
title_sort |
hyposaline conditions affect uv susceptibility in the arctic kelp alaria esculenta (phaeophyceae) - results of laboratory experiments at kongsfjorden, june/july 2014 |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.894853 https://doi.org/10.1594/PANGAEA.894853 |
op_coverage |
LATITUDE: 78.916670 * LONGITUDE: 11.933330 |
long_lat |
ENVELOPE(11.933330,11.933330,78.916670,78.916670) |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic Kongsfjord* Kongsfjorden Svalbard Spitsbergen |
genre_facet |
Arctic Arctic Kongsfjord* Kongsfjorden Svalbard Spitsbergen |
op_source |
Supplement to: Springer, Karin; Lütz, Cornelius; Lütz-Meindl, Ursula; Wendt, Angela; Bischof, Kai (2017): Hyposaline conditions affect UV susceptibility in the Arctic kelp Alaria esculenta (Phaeophyceae). Phycologia, 56(6), 675-685, https://doi.org/10.2216/16-122.1 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.894853 https://doi.org/10.1594/PANGAEA.894853 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.894853 https://doi.org/10.2216/16-122.1 |
_version_ |
1766297806963736576 |