Ultraviolet radiation modulates the physiological responses of the calcified rhodophyte Corallina officinalis to elevated CO2
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Gamze Yildiz
,
Laurie C. Hofmann
Abstract
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.
©2013 by Walter de Gruyter Berlin Boston
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- Second addendum to the synoptic review of red algal genera
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- Vegetative and reproductive morphology of Polysiphonia tripinnata (Rhodomelaceae, Rhodophyta): a new record from the European Atlantic coast
- Ultraviolet radiation modulates the physiological responses of the calcified rhodophyte Corallina officinalis to elevated CO2
- Seasonal variation of trace metal (Mn, Zn, Cu, Pb, Co, Cd) concentrations in compartments of the seagrass Cymodocea nodosa
- Use of Posidonia oceanica seedlings from beach-cast fruits for seagrass planting
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Articles in the same Issue
- Masthead
- Masthead
- Review
- Second addendum to the synoptic review of red algal genera
- Research articles
- Callophyllis cornu-cervi (Perestenko) comb. nov. (Gigartinales, Rhodophyta): re-evaluation of the endemic monotypic genus Ionia from the Sea of Okhotsk based on morphology and molecular evidence
- The turf-forming alga Gelidium crinale (Florideophyceae, Rhodophyta) on Atlantic Patagonian coasts
- Recent introduction of Gracilaria parvispora (Gracilariales, Rhodophyta) in Baja California, Mexico
- Vegetative and reproductive morphology of Polysiphonia tripinnata (Rhodomelaceae, Rhodophyta): a new record from the European Atlantic coast
- Ultraviolet radiation modulates the physiological responses of the calcified rhodophyte Corallina officinalis to elevated CO2
- Seasonal variation of trace metal (Mn, Zn, Cu, Pb, Co, Cd) concentrations in compartments of the seagrass Cymodocea nodosa
- Use of Posidonia oceanica seedlings from beach-cast fruits for seagrass planting
- Morphology, ontogeny, and phylogenetic position of Gayralia brasiliensis sp. nov. (Ulotrichales, Chlorophyta) from the southern coast of Brazil
