ZoopSeis – Effects of seismic sound on zooplankton

Funding agency: The Research Council of Norway, MARINFORSK Program.
Project period: 2020-2023
Project leader: Lise Doksæter Sivle
Co-investigators: Karen de Jong, Nils Olav Handegard, Howard Browman, David Fields, Anne Berit Skiftesvik+++
Project summary
Anthropogenic noise from seismic surveys has been documented to affect fish and marine mammals both in terms of physical injury and changes in behaviour. However, data on lower taxa are scarce. Two recent studies show highly contradicting results. A study by McCauley et al. (2017) indicates that seismic blasts may kill various species of zooplankton in Australia at distances of up to 1200 m from an airgun, while another study (Fields et al. 2019) reports no mortality or sublethal effect at distances >10m from a seismic blast in Norway. These highly contradictory results suggest that effects may be variable and highly dependent on species and geographic area. To predict at what ranges a seismic survey can impact zooplankton populations, a thorough understanding of the mechanism behind such effects is crucial. In this project, we will use a combination of modelling and laboratory to address what forces can induce injury and mortality in zooplankton, and at what ranges from a seismic survey such forces could be strong enough to have a lasting impact. We will focus on direct mortality, reproductive output and predator avoidance to assess both immediate and delayed effects. In addition, we will use field studies to verify predicted effects on natural population and to assess the potential for avoidance. The results will be used to provide advice on how to minimize the negative impact of seismic surveys in areas with high zooplankton concentrations.