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A freshwater zooplankton in the face to boat noise pollution

Ecotoxicological studies mainly focus on chemical pollution, however, since past decades, there has been a growing interest for the acoustic pollution. Previous studies on underwater acoustic pollution showed that noise affects vertebrates’ behaviour, like fish and marine mammals. However, little is known about other organisms. Consequently, we studied important lacking aspects, well known with chemical pollution: the effect on the fitness (survival and fecundity) of a key zooplankton species (used as bioindicator). We exposed isolated water fleas, Daphnia magna, to chronic boat noises or to a broadcasted silence as control, from birth to death. We measured effects on lifespan and clonal offspring production (e.g., clutch size, number of produced offspring along life). We did not observe any effect of the chronic boat noise exposition on Daphnia’s fitness. These results are consistent with results on some previous acute noise exposures, but also opposite to other ones found with some acute and chronic noises. Thus, we discuss how the noise structure and temporal pattern could affect its impacts on aquatic organisms. Our work highlights that noise pollution should be integrated in ecotoxicological studies, but also that some particular aspects of this pollutant should be considered differently than chemical pollutants.