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The production of volatile iodocarbons by biogenic marine aggregates
Author(s) -
Hughes C.,
Malin G.,
Turley C. M.,
Keely B. J.,
Nightingale P. D.
Publication year - 2008
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.2008.53.2.0867
Subject(s) - diatom , environmental chemistry , seawater , dimethylsulfoniopropionate , plankton , phytodetritus , chemistry , oceanography , phytoplankton , environmental science , nutrient , geology , organic chemistry
We present the first reported measurements of volatile iodocarbon production by biogenic marine aggregates. Iodomethane (CH 3 I), iodoethane (C 2 H 5 I), 2‐iodopropane (CH 3 CHICH 3 ), and 1‐iodopropane (CH 3 CH 2 CH 2 I) 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 CH 3 CHICH 3 to 0.31 pmol L −1 h −1 for C 2 H 5 I. 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.