Acclimation of Antarctic bottom-ice algal communities to lowered salinities during melting
Sea-ice brine algal communities were exposed to salinities between 30 and 10 during melting. There was a progressive decline in maximum quantum yield, relative electron transfer rate (rETRmax) and photosynthetic efficiency () with decreasing salinity of the final melted sample. While all species sho...
| Published in: | Polar Biology |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Springer-Verlag
2004
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| Subjects: | |
| Online Access: | https://doi.org/10.1007/s00300-004-0636-y http://ecite.utas.edu.au/32173 |
| Summary: | Sea-ice brine algal communities were exposed to salinities between 30 and 10 during melting. There was a progressive decline in maximum quantum yield, relative electron transfer rate (rETRmax) and photosynthetic efficiency () with decreasing salinity of the final melted sample. While all species showed a drop in these parameters, Fragilariopsis curta and Entomoneis kjellmannii showed the least inhibition. There was a steady increase in rETRmax and alpha; over 5 days after melting, especially in the samples melted into the highest salinities. In addition, the samples melted from the ice without added filtered seawater showed no photosynthetic activity after 2 days. Our results suggest that for experimental work using sea-ice microalgae, the final salinity of the melted sample should be greater than 28 (i.e. the ratio of sea ice to filtered seawater should be at least 1:2). Springer-Verlag 2004. |
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