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Toxic responses of the green alga Dunaliella bioculata (Chlorophycea, Volvocales) to selected oxidised hydrocarbons

1984; Elsevier BV; Volume: 34; Issue: 2 Linguagem: Inglês

10.1016/0143-1471(84)90053-9

1878-0709

Mikal Heldal, S. Norland, T. Lien, Gjert Knutsen, Kjell Tjessem, A. Aarberg,

Catalytic Processes in Materials Science

Abstract Hydroperoxides, alcohols, acids, ketones, quinones and epoxides represent classes of compounds likely to be formed as a result of photodecomposition of crude oil. Selected representatives of these classes of compounds were tested for toxicity on the green alga Dunaliella bioculata . Hydroperoxides and quinones were found to be extremely toxic, with 50%-effect concentration values from 0·01 to 0·7 ppm. No clear correlation between chemical structure and toxic mode of action could be established. The alga showed two major responses, depending on the compound tested. One group of compounds had mainly an effect on the growth rate while the other caused an immediate mortality and a following disruption of the dead cells. This latter effect was seen as an initial reduction in biomass, whereas the growth rate was unaffected.