Correction to: Scientific Reports https://doi.org/10.1038/s41598-019-48417-5, published online 21 August 2019

In the original version of this Article, Giacomo Giorli was incorrectly affiliated with ‘Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 7600 Sand Point Way N.E., Seattle, Washington, 98115-6349, USA’. The correct affiliation is listed below.

National Institute of Water and Atmospheric Research, Coasts and Oceans, 301 Evans Bay Parade, Greta Point, Wellington 6021, New Zealand

This error has now been corrected in the PDF and HTML versions of the Article.