Photoadaptation in Phaeocystis pouchetii advected beneath annual sea ice in McMurdo Sound, Antarctica

A bloom of the colonial microalga Phaeocystis pouchetii was advected from ice-free waters to beneath 1.5 m of annual fast ice in East McMurdo Sound, Antarctica in late December 1984. Strategies of photoadaptation to a reduction in growth irradiance involved a 3- to 4-fold increase in photosynthetic...

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Bibliographic Details
Published in:Journal of Plankton Research
Main Authors: Palmisano, Anna C., SooHoo, Janice Beeler, SooHoo, Spencer L., Kottmeier, Steven T., Craft, Lin L., Sullivan, Cornelius W.
Format: Text
Language:English
Published: Oxford University Press 1986
Subjects:
Articles
McMurdo Sound
East Sound
Antarc*
Antarctica
Sea ice
Online Access:http://plankt.oxfordjournals.org/cgi/content/short/8/5/891
https://doi.org/10.1093/plankt/8.5.891
Description
Summary:A bloom of the colonial microalga Phaeocystis pouchetii was advected from ice-free waters to beneath 1.5 m of annual fast ice in East McMurdo Sound, Antarctica in late December 1984. Strategies of photoadaptation to a reduction in growth irradiance involved a 3- to 4-fold increase in photosynthetic efficiency per chlorophyll a (αb) and a 2- to 3-fold increase in photosynthetic efficiency per cell (αc). The index of photoadaptation (I k ) decreased by 50% on both a chlorophyll a and cellular basis. In situ production by Phaeocystis under sea ice in the East Sound is estimated to contribute 16 g carbon m−2 annually, a value comparable with sea ice algal production.

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