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The effect of prolonged darkness on the growth, recovery and survival of Antarctic sea ice diatoms


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Reeves, S, McMinn, A and Martin, A 2011 , 'The effect of prolonged darkness on the growth, recovery and survival of Antarctic sea ice diatoms' , Polar Biology, vol. 34 , pp. 1019-1032 , doi: 10.1007/s00300-011-0961-x.

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While global climate change in polar regions is
expected to cause significant warming, the annual cycle of
light and dark will remain unchanged. Cultures of three
species of Antarctic sea ice diatoms, Fragilariopsis cylindrus
(Grunow) Krieger, Thalassiosira antarctica Comber
and Entomoneis kjellmanii (P.T. Cleve) Poulin and Cardinal,
were incubated in the dark and exposed to differing
temperatures. Maximum dark survival times varied
between 30 and 60 days. Photosynthetic parameters, photosynthetic
efficiency (a), maximum quantum yield (Fv/
Fm), maximum relative electron transport rate (rETRmax)
and non-photochemical quenching (NPQ), showed that
dark exposure had a significant impact on photoacclimation.
In contrast, elevated temperatures had a relatively
minor impact on photosynthetic functioning during the
dark exposure period but had a considerable impact on dark
survival with minimal dark survival times reduced to only
7 days when exposed to 10C. Recovery of maximum
quantum yield of fluorescence (Fv/Fm) was not significantly
impacted by temperature, species or dark exposure
length. Recovery rates of Fv/Fm ranged from -5.06E-
7 ± 2.71E-7 s-1 to 1.36E-5 ± 1.53E-5 s-1 for
monthly experiments and from -9.63E-7 ± 7.71E-7 s-1
to 2.65E-5 ± 2.97E-5 s-1 for weekly experiments. NPQ
recovery was greater and more consistent than Fv/Fm
recovery, ranging between 5.74E-7 ± 8.11E-7 s-1 to
7.50E-3 ± 7.1E-4 s-1. The concentration of chl-a and
monosaccharides remained relatively constant in both
experiments. These results suggest that there will probably
be little effect on Antarctic microalgae with increasing
water temperatures during the Antarctic winter.

Item Type: Article
Authors/Creators:Reeves, S and McMinn, A and Martin, A
Keywords: Winter, Dark survival, Phytoplankton, Sea ice
Journal or Publication Title: Polar Biology
DOI / ID Number: 10.1007/s00300-011-0961-x
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