Low-frequency noise influences fin whale songs

Shipping noise can negatively affect baleen whales behaviour, including their reproductive singing. Currently limited research studies have focused on the fin whale ( Balaenoptera physalus ). The aim of this paper is to describe how shipping noise may affect fin whale songs. Background noise levels for 42 songs were measured and analysed in relation to parameters that describe song structure. Here we show that increasing noise levels were associated with significant changes in the Inter-pulse-interval – for all deployments investigated - as well as peak and center frequency of classic notes. Effects were not the same for all deployments, suggesting that responses to shipping noise might depend on seasons, locations and/or inter-individual variability. Such modifications may increase energetic costs and reduce communication efficacy, potentially lowering the reproductive success.