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Photosynthetic response and recovery of Antarctic marine benthic microalgae exposed to elevated irradiances and temperatures


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Salleh, S and McMinn, A 2011 , 'Photosynthetic response and recovery of Antarctic marine benthic microalgae exposed to elevated irradiances and temperatures' , Polar Biology, vol. 34 , pp. 855-869 , doi: 10.1007/s00300-010-0943-4.

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Exposure to high temperatures affects the
photosynthetic processes in marine benthic microalgae by
limiting the transport of electrons, thus reducing the ability
of the cell to use light. This causes damage to the Photosystem
II (PSII) and may lead to photoinhibition. However,
the PSII of benthic microalgal communities from Brown
Bay, eastern Antarctica, were relatively unaffected by
significant changes in temperature. Benthic microalgae
exposed to temperatures up to 8C and an irradiance of
450 lmol photons m-2 s-1 did not experience any photosynthetic
damage or irreversible photoinhibition. The
effective quantum yield (DF/Fm0) at 8C (0.433 ± 0.042)
was higher by comparison to cell incubated at -0.1C
(0.373 ± 0.015) with similar irradiances. Temperatures
down to -5C at a similar irradiance showed a decrease in
photosynthesis with decreasing temperature, but no severe
photoinhibition as the cells were able to dissipate excess
energy via non-photochemical quenching and recover from
damage. These responses are consistent with those recorded
in past studies on Antarctic benthic microalgae and
suggest that short-term temperature change (from -5 to
8C) will not do irreversible damage to the PSII and will
not affect the photosynthesis of the benthic microalgae.

Item Type: Article
Authors/Creators:Salleh, S and McMinn, A
Keywords: Antarctic benthic microalgae, Photoinhibition, Recovery, Temperature
Journal or Publication Title: Polar Biology
ISSN: 0722-4060 (Print) 1432-2056 (Online)
DOI / ID Number: 10.1007/s00300-010-0943-4
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