Photoacclimation in Antarctic bottom ice algae: an experimental approach |
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Authors: | Olga Mangoni Gian Carlo Carrada Monica Modigh Giulio Catalano Vincenzo Saggiomo |
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Institution: | (1) Dipartimento delle Scienze Biologiche, Università di Napoli Federico II, Via Mezzocannone, 8, 80134 Naples, Italy;(2) Stazione Zoologica Anton Dohrn, Villa Comunale I, 80121 Naples, Italy;(3) CNR, Istituto di Scienze Marine, Trieste, Italy |
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Abstract: | The aim of the study was to investigate the capacity of microalgae from the extremely low light habitat of bottom ice to acclimate
to different light conditions. During austral spring 1997 the bottom layer of land-fast ice in Terra Nova Bay displayed high
values of microalgal biomass up to 2,400 μg Chla L−1 concentrated in a few centimetres ice layer. The algal assemblage was dominated by benthic pennate diatoms. Photoacclimation
of the microalgae was addressed in terms of pigment spectra and photosynthetic parameters. Immediate and long term (minutes
to days) changes in the photoprotective pigments (DD-cycle) were analysed. Severe photodamage occurred in microalgal assemblages
exposed to high light. However, part of the bottom ice algal community showed a notable ability to acclimate to high irradiance
levels. Changes in photosynthetic parameters preceded the sudden abrupt changes in pigment synthesis and the rapid increase
in biomass and growth rates.
This article belongs to a special topic: Five articles on Sea-ice communities in Terra Nova Bay (Ross Sea), coordinated by
L. Guglielmo and V. Saggiomo, appear in this issue of Polar Biology. The studies were conducted in the frame of the National
Program of Research in Antarctica (PNRA) of Italy. |
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Keywords: | Ross Sea Terra Nova Bay Fast ice Bottom ice microalgae Photoacclimation HPLC pigments DD-cycle |
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