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   The diversity of naturally produced organohalogens   
   Chemosphere, 2003, Volume 52, Issue 2, pp. 289 - 297   
   DOI: 10.1016/S0045-6535(03)00207-8   
   Gordon W.Gribble,   
   Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover,   
   NH 03755-3564, USA   
      
   More than 3800 organohalogen compounds, mainly containing chlorine or   
   bromine but a few with iodine and fluorine, are produced by living organisms   
   or are formed during natural abiogenic processes, such as volcanoes, forest   
   fires, and other geothermal processes. The oceans are the single largest   
   source of biogenic organohalogens, which are biosynthesized by myriad   
   seaweeds, sponges, corals, tunicates, bacteria, and other marine life.   
   Terrestrial plants, fungi, lichen, bacteria, insects, some higher animals,   
   and even humans also account for a diverse collection of organohalogens.   
      
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