Comparative toxicity of a brominated flame retardant (tetrabromobisphenol A) on microalgae with single and multi-species bioassays

► We studied the impact of species interactions on the responses of two microalgae to toxic exposure. ► Single- and multi-species bioassays were carried out. ► We assessed the cell growth and the cell viability with a flow cytometer. ► Sensitivity of Nitzschia Palea to a brominated flame retardant (TBBPA) significantly increased in multi-species bioassay. ► No significant differences were noticed between the two tests for Pseudokirchneriella subcapitata.