Release and transformations of inorganic iodine by marine macroalgae |
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| Authors: | Rosie Chance Alex R Baker Frithjof C Küpper Claire Hughes Bernard Kloareg Gill Malin |
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| Institution: | 1. Laboratory for Global Marine and Atmospheric Chemistry, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK;2. Station Biologique, UMR 7139 Université Pierre et Marie et Curie-Paris 6, Végétaux Marins et Biomolécules – Centre National de la Recherche Scientifique (CNRS), BP 74, F-29682 Roscoff, Bretagne, France;3. Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, Argyll PA37 1QA, Scotland, UK |
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| Abstract: | A number of field and laboratory studies on the impact of marine macroalgae on dissolved inorganic iodine speciation are presented. Within tidally isolated rock pools, the brown macroalga Fucus serratus was found to both release stored iodide and to facilitate the reduction of iodate to iodide. In contrast, no discernible changes in iodine speciation were observed in rock pools containing green macroalgae of the genus Ulva. Incubation experiments confirmed that the macroalgae Laminaria digitata, F. serratus and Kallymenia antarctica release iodide, though the rate of release varied between species and between specimens of the same species. Application of oxidative stress by treatment with cell wall derived oligoguluronate elicitors increased the efflux of iodide by L. digitata approximately 20-fold. The release of iodide by macroalgae may impact upon the formation of volatile iodine species (molecular iodine and iodocarbons) that are of importance in the coastal atmosphere. |
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| Keywords: | iodine iodide seaweeds Laminaria sp Fucus sp biological stress |
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