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Botanica Marina

Editor-in-Chief: Dring, Matthew J.

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Volume 56, Issue 2


Ultraviolet radiation modulates the physiological responses of the calcified rhodophyte Corallina officinalis to elevated CO2

Gamze Yildiz / Laurie C. Hofmann / Kai Bischof / Şükran Dere
Published Online: 2013-03-30 | DOI: https://doi.org/10.1515/bot-2012-0216


Ocean acidification reduces the concentration of carbonate ions and increases those of bicarbonate ions in seawater compared with the present oceanic conditions. This altered composition of inorganic carbon species may, by interacting with ultraviolet radiation (UVR), affect the physiology of macroalgal species. However, very little is known about how calcareous algae respond to UVR and ocean acidification. Therefore, we conducted an experiment to determine the effects of UVR and ocean acidification on the calcified rhodophyte Corallina officinalis using CO2-enriched cultures with and without UVR exposure. Low pH increased the relative electron transport rates (rETR) but decreased the CaCO3 content and had a miniscule effect on growth. However, UVA (4.25 W m-2) and a moderate level of UVB (0.5 W m-2) increased the rETR and growth rates in C. officinalis, and there was a significant interactive effect of pH and UVR on UVR-absorbing compound concentrations. Thus, at low irradiance, pH and UVR interact in a way that affects the multiple physiological responses of C. officinalis differently. In particular, changes in the skeletal content induced by low pH may affect how C. officinalis absorbs and uses light. Therefore, the light quality used in ocean acidification experiments will affect the predictions of how calcified macroalgae will respond to elevated CO2.

Keywords: calcification; chlorophyll fluorescence; ocean acidification; photosynthesis; ultraviolet radiation

About the article

Corresponding author: Gamze Yildiz, Science and Arts Faculty, Department of Biology, Uludag University, 16059 Bursa, Turkey

Received: 2012-10-24

Accepted: 2013-02-22

Published Online: 2013-03-30

Published in Print: 2013-04-01

Citation Information: Botanica Marina, Volume 56, Issue 2, Pages 161–168, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/bot-2012-0216.

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