INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA
Devaleraea ramentacea represents one of the few red macroalgal species endemic to the Arctic. Previous unifactorial experiments revealed a generally high tolerance of D. ramentacea to variation in abiotic conditions. Although in the field the effects of photosynthetically active (PAR) and UV-radiati...
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ftawi:oai:epic.awi.de:17334 2023-05-15T14:24:35+02:00 INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA Fredersdorf, Jana Karsten, Ulf Bischof, Kai 2007 https://epic.awi.de/id/eprint/17334/ https://hdl.handle.net/10013/epic.27667 unknown Fredersdorf, J. , Karsten, U. and Bischof, K. (2007) INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA , IV European Phycological Congress, Oviedo.-28.07.2007. . hdl:10013/epic.27667 EPIC3IV European Phycological Congress, Oviedo.-28.07.2007., 23 Conference notRev 2007 ftawi 2021-12-24T15:32:07Z Devaleraea ramentacea represents one of the few red macroalgal species endemic to the Arctic. Previous unifactorial experiments revealed a generally high tolerance of D. ramentacea to variation in abiotic conditions. Although in the field the effects of photosynthetically active (PAR) and UV-radiation, temperature and salinity are usually interconnected, studies on interactive effects on its physiology are scarce. Mesocosm-experiments under natural solar radiation as well as laboratory set-ups under defined, artificial radiation conditions were conducted at Spitsbergen in order to reveal physiological responses of D. ramentacea under multiple abiotic stress. The algae were exposed to experimental treatments with/without UV-radiation, at three different water temperatures and at different salinities. In each treatment, photosynthetic performance was monitored by PAM chlorophyll fluorescence measurements and algal fragments were conserved for later biochemical analysis. Photosynthetic measurements confirm the high tolerance of adult sporophytes of D. ramentacea towards single and combined stress factors. Experimentally induced changes in the content of UV-screening mycosporine-like amino acids (MAA) and the enzymatic activity of superoxid-dimutase were studied. A specific characteristic of D. ramentacea under changing abiotic conditions is the greening of the tips. The factors inducing the loss of phycobiliproteins and the changes in physiological performance in the affected thallus fragments are addressed. Results will be discussed in the context of the species distributional patterns. Conference Object Arctic Arctic Spitsbergen Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
Devaleraea ramentacea represents one of the few red macroalgal species endemic to the Arctic. Previous unifactorial experiments revealed a generally high tolerance of D. ramentacea to variation in abiotic conditions. Although in the field the effects of photosynthetically active (PAR) and UV-radiation, temperature and salinity are usually interconnected, studies on interactive effects on its physiology are scarce. Mesocosm-experiments under natural solar radiation as well as laboratory set-ups under defined, artificial radiation conditions were conducted at Spitsbergen in order to reveal physiological responses of D. ramentacea under multiple abiotic stress. The algae were exposed to experimental treatments with/without UV-radiation, at three different water temperatures and at different salinities. In each treatment, photosynthetic performance was monitored by PAM chlorophyll fluorescence measurements and algal fragments were conserved for later biochemical analysis. Photosynthetic measurements confirm the high tolerance of adult sporophytes of D. ramentacea towards single and combined stress factors. Experimentally induced changes in the content of UV-screening mycosporine-like amino acids (MAA) and the enzymatic activity of superoxid-dimutase were studied. A specific characteristic of D. ramentacea under changing abiotic conditions is the greening of the tips. The factors inducing the loss of phycobiliproteins and the changes in physiological performance in the affected thallus fragments are addressed. Results will be discussed in the context of the species distributional patterns. |
format |
Conference Object |
author |
Fredersdorf, Jana Karsten, Ulf Bischof, Kai |
spellingShingle |
Fredersdorf, Jana Karsten, Ulf Bischof, Kai INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA |
author_facet |
Fredersdorf, Jana Karsten, Ulf Bischof, Kai |
author_sort |
Fredersdorf, Jana |
title |
INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA |
title_short |
INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA |
title_full |
INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA |
title_fullStr |
INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA |
title_full_unstemmed |
INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA |
title_sort |
interactive effects of radiation, temperature and salinity on the arctic-endemic red alga devaleraea ramentacea |
publishDate |
2007 |
url |
https://epic.awi.de/id/eprint/17334/ https://hdl.handle.net/10013/epic.27667 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Spitsbergen |
genre_facet |
Arctic Arctic Spitsbergen |
op_source |
EPIC3IV European Phycological Congress, Oviedo.-28.07.2007., 23 |
op_relation |
Fredersdorf, J. , Karsten, U. and Bischof, K. (2007) INTERACTIVE EFFECTS OF RADIATION, TEMPERATURE AND SALINITY ON THE ARCTIC-ENDEMIC RED ALGA DEVALERAEA RAMENTACEA , IV European Phycological Congress, Oviedo.-28.07.2007. . hdl:10013/epic.27667 |
_version_ |
1766297014720528384 |