Can bottom ice algae tolerate radiative and temperature changes?
Sea ice algae are significant primary producers of the ice-covered marine environment, growing under typically cold, dim conditions. During ice break-up they are released to the water column, where temperatures can be several degrees higher and irradiance can increase by orders of magnitude. To dete...
Published in: | Journal of Experimental Marine Biology and Ecology |
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ftnerc:oai:nora.nerc.ac.uk:507187 2023-05-15T13:48:08+02:00 Can bottom ice algae tolerate radiative and temperature changes? Rajanahally, Meghana A. Sim, Dalice Ryan, Ken G. Convey, Peter 2014-12-01 text http://nora.nerc.ac.uk/id/eprint/507187/ https://nora.nerc.ac.uk/id/eprint/507187/1/Convey.doc en eng Elsevier https://nora.nerc.ac.uk/id/eprint/507187/1/Convey.doc Rajanahally, Meghana A.; Sim, Dalice; Ryan, Ken G.; Convey, Peter orcid:0000-0001-8497-9903 . 2014 Can bottom ice algae tolerate radiative and temperature changes? Journal of Experimental Marine Biology and Ecology, 461. 516-527. https://doi.org/10.1016/j.jembe.2014.10.005 <https://doi.org/10.1016/j.jembe.2014.10.005> Publication - Article PeerReviewed 2014 ftnerc 2023-02-04T19:39:38Z Sea ice algae are significant primary producers of the ice-covered marine environment, growing under typically cold, dim conditions. During ice break-up they are released to the water column, where temperatures can be several degrees higher and irradiance can increase by orders of magnitude. To determine how sea ice algae respond to such rapid changes, we carried out incubations to examine their tolerance to environmentally realistic levels of change in temperature and PAR, as expressed by photosynthetic response and production of mycosporine-like amino acids (MAAs). The algae were also exposed to a broader range of temperatures, to evaluate their potential to function in warmer seas in the event, for instance, of anthropogenic transfer to locations further north. When subjected to PAR (0–100 μmol m− 2 s− 1) at ecologically relevant temperatures (− 1 °C, 2 °C, 5 °C), the algae showed tolerance, indicated by a lack of decline in the quantum efficiency of photosystem II (PSII). The data show that bottom ice algae can tolerate increasing temperature and PAR comparable to the changes experienced during and after sea ice melt. MAA production increased at higher PAR and temperature. At ambient PAR levels, increased temperatures resulted in lower ϕPSII. However, as PAR levels were increased, higher temperature reduced the level of stress as indicated by higher ϕPSII values. This result suggests, for the first time in sea ice algal studies, that higher temperatures can ameliorate the negative effects of increased PAR. Exposure to much higher temperatures suggested that the algae were capable of retaining some photosynthetic function at water temperatures well above those currently experienced in some of their Antarctic habitats. However, when temperature was gradually increased past 14 °C, the photosystems started to become inactivated as indicated by a decrease in quantum yield, suggesting that the algae would not be viable if transferred to lower latitude cold temperate areas. Article in Journal/Newspaper Antarc* Antarctic ice algae Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Journal of Experimental Marine Biology and Ecology 461 516 527 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Sea ice algae are significant primary producers of the ice-covered marine environment, growing under typically cold, dim conditions. During ice break-up they are released to the water column, where temperatures can be several degrees higher and irradiance can increase by orders of magnitude. To determine how sea ice algae respond to such rapid changes, we carried out incubations to examine their tolerance to environmentally realistic levels of change in temperature and PAR, as expressed by photosynthetic response and production of mycosporine-like amino acids (MAAs). The algae were also exposed to a broader range of temperatures, to evaluate their potential to function in warmer seas in the event, for instance, of anthropogenic transfer to locations further north. When subjected to PAR (0–100 μmol m− 2 s− 1) at ecologically relevant temperatures (− 1 °C, 2 °C, 5 °C), the algae showed tolerance, indicated by a lack of decline in the quantum efficiency of photosystem II (PSII). The data show that bottom ice algae can tolerate increasing temperature and PAR comparable to the changes experienced during and after sea ice melt. MAA production increased at higher PAR and temperature. At ambient PAR levels, increased temperatures resulted in lower ϕPSII. However, as PAR levels were increased, higher temperature reduced the level of stress as indicated by higher ϕPSII values. This result suggests, for the first time in sea ice algal studies, that higher temperatures can ameliorate the negative effects of increased PAR. Exposure to much higher temperatures suggested that the algae were capable of retaining some photosynthetic function at water temperatures well above those currently experienced in some of their Antarctic habitats. However, when temperature was gradually increased past 14 °C, the photosystems started to become inactivated as indicated by a decrease in quantum yield, suggesting that the algae would not be viable if transferred to lower latitude cold temperate areas. |
format |
Article in Journal/Newspaper |
author |
Rajanahally, Meghana A. Sim, Dalice Ryan, Ken G. Convey, Peter |
spellingShingle |
Rajanahally, Meghana A. Sim, Dalice Ryan, Ken G. Convey, Peter Can bottom ice algae tolerate radiative and temperature changes? |
author_facet |
Rajanahally, Meghana A. Sim, Dalice Ryan, Ken G. Convey, Peter |
author_sort |
Rajanahally, Meghana A. |
title |
Can bottom ice algae tolerate radiative and temperature changes? |
title_short |
Can bottom ice algae tolerate radiative and temperature changes? |
title_full |
Can bottom ice algae tolerate radiative and temperature changes? |
title_fullStr |
Can bottom ice algae tolerate radiative and temperature changes? |
title_full_unstemmed |
Can bottom ice algae tolerate radiative and temperature changes? |
title_sort |
can bottom ice algae tolerate radiative and temperature changes? |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/507187/ https://nora.nerc.ac.uk/id/eprint/507187/1/Convey.doc |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic ice algae Sea ice |
genre_facet |
Antarc* Antarctic ice algae Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/507187/1/Convey.doc Rajanahally, Meghana A.; Sim, Dalice; Ryan, Ken G.; Convey, Peter orcid:0000-0001-8497-9903 . 2014 Can bottom ice algae tolerate radiative and temperature changes? Journal of Experimental Marine Biology and Ecology, 461. 516-527. https://doi.org/10.1016/j.jembe.2014.10.005 <https://doi.org/10.1016/j.jembe.2014.10.005> |
container_title |
Journal of Experimental Marine Biology and Ecology |
container_volume |
461 |
container_start_page |
516 |
op_container_end_page |
527 |
_version_ |
1766248757700067328 |