Bromoform emission from Arctic ice algae

Article Abstract:

Arctic ice microalgae may be indirectly bringing about the breakdown of surface ozone that occurs in the Arctic atmosphere every spring. The algae do this by producing large amounts of the chemical bromoform, which is altered by photochemical action into the bromine compounds that are known to destroy ozone. In fact, laboratory and on-sight measurements suggest that polar ice algae may be adding ozone-destroying chemicals to the air at a rate in proportion to anthropogenic and macrophyte sources.

Causes of, Arctic regions, Ozone layer depletion, Bromine

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Grazing-activated chemical defence in a unicellular marine alga

Article Abstract:

Research shows that the marine alga Emiliania huxleyi releases dimethylsulphonopropionate (DMSP) as a chemical defence mechanism to protect it from being grazed by predator protozoons. It is shown that the DMSP is converted to concentrated acrylic acid, which has antimicrobial activity. It is suggested that some production of dimethyl sulphide, which plays a major part in the global sulphur cycle, may be a by-product of the alga's chemical defence.

Health aspects, Marine plankton

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Invasive alga reaches California

Article Abstract:

Issues surrounding the discovery of the Caulerpa taxifolia marine green alga on the coast of California are discussed. The DNA characteristics of this alga show it is the same as the invasive strain of alga which has spread throughout the Mediterranean Sea since 1984, damaging ecosystems.

California, Genetic aspects, Green algae, Marine algae

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