The production of volatile iodocarbons by biogenic marine aggregates

C Hughes, G Malin, CM Turley, BJ Keely, PD Nightingale, PS Liss

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Abstract

We present the first reported measurements of volatile iodocarbon production by biogenic marine aggregates. Iodomethane (CH3 I), iodoethane (C2H5I), 2-iodopropane (CH 3CHICH3), and 1-iodopropane (CH3CH 2CH2I) concentrations were determined in incubations of aggregates formed by concentrating the >53 µm fraction of the plankton during a field campaign in the Celtic Sea. All four iodocarbons increased significantly in concentration in the aggregate incubations relative to filtered seawater controls. Maximum production rates ranged from 0.01 pmol L -1 h-1 for CH3 CHICH3 to 0.31 pmol L-1 h-1 for C2H5I. Accompanying pheopigment and bacterial heterotrophic production suggest that the processes taking place on the aggregates studied were a good representation of those known to occur on natural marine particles. We also report iodocarbon production rates observed in natural marine aggregates, including a diatom mucilage collected in the Celtic Sea and phytodetritus sampled from Kongsfjord in the Arctic. Detrital particles could be hotspots of iodocarbon production in the marine environment.
Original languageEnglish
Pages (from-to)867-872
Number of pages6
JournalLimnology and Oceanography
Volume53
Issue number2
DOIs
Publication statusPublished - Mar 2008

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