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| Titel |
The effect of desiccation on the emission of volatile bromocarbons from two common temperate macroalgae |
| VerfasserIn |
E. C. Leedham Elvidge, S.-M. Phang, W. T. Sturges, G. Malin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 2 ; Nr. 12, no. 2 (2015-01-21), S.387-398 |
| Datensatznummer |
250117779
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| Publikation (Nr.) |
 copernicus.org/bg-12-387-2015.pdf |
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| Zusammenfassung |
| Exposure of intertidal macroalgae during low tide has been linked to the
emission of a variety of atmospherically-important trace gases into the coastal
atmosphere. In recent years, several studies have investigated the role of
inorganic iodine and organoiodides as antioxidants and their emission during
exposure to combat oxidative stress, yet the role of organic bromine species
during desiccation is less well understood. In this study the emission of
dibromomethane (CH2Br2) and bromoform (CHBr3) during exposure
and desiccation of two common temperate macroalgae, Fucus vesiculosus and Ulva intestinalis, is reported.
Determination of the impact exposure may have on algal physiological
processes is difficult as intertidal species are adapted to desiccation and
may undergo varying degrees of desiccation before their physiology is
affected. For this reason we include comparisons between photosynthetic
capacity (Fv/Fm) and halocarbon emissions during a desiccation
time series. In addition, the role of rewetting with freshwater to simulate
exposure to rain was also investigated. Our results show that an immediate
flux of bromocarbons occurs upon exposure, followed by a decline in
bromocarbon emissions. We suggest that this immediate bromocarbon pulse may
be linked to volatilisation or emissions of existing bromocarbon stores from
the algal surface rather than the production of bromocarbons as an
antioxidant response. |
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