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Licensed Unlicensed Requires Authentication Published by De Gruyter November 8, 2012

Phototactic responses of Elachista antarctica (Phaeophyceae) spores of different ages across a broad irradiance range using new motion analysis software

Philip Bucolo, Charles D. Amsler, James B. McClintock and Bill J. Baker
From the journal Botanica Marina


Phototactic movements of Elachista antarctica spores were quantified across a wide range of irradiances from 10 to 800 μmol photons m-2 s-1 using the recently updated version of CellTrak 1.5 motion analysis software. Spores 0–12 h old exhibited phototactic attraction at 80 and 200 μmol photons m-2 s-1, which contributed to vertical movements up out of the boundary layer to be further dispersed hydrodynamically, but were repelled at 800 μmol photons m-2 s-1, causing spores to retreat from detrimental irradiances. No significant effects were observed among spores released 24–36 h before measuring phototaxis at 200 and 800 μmol photons m-2 s-1.

Corresponding author: Philip Bucolo, Department of Biology, University of Alabama at Birmingham, Birmingham, AL 35294-1170, USA

Received: 2012-4-12
Accepted: 2012-10-4
Published Online: 2012-11-08
Published in Print: 2012-12-01

©2012 by Walter de Gruyter Berlin Boston

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