Effects of linear alkylbenzene sulphonate (LAS) on two marine benthic organisms

Abstract

The effects of dissolved linear alkylbenzene sulphonate (LAS) on two marine benthic filter-feeders, the sea-squirts Botryllus schlosseri and Botrylloides leachi, were tested. The survival and growth rates of both species were significantly affected at LAS concentrations ranging from 0.25 to 0.50 ppm. Larvae were apparently more resistant than adults. However, treatments beginning at the pelagic stage strongly affected the negative response of the next benthic phase, although the pelagic stage only lasted 1.5% of the total duration of the treatment, indicating that the effects of LAS are exerted mainly on this phase of the life cycle.