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. 2016 Jan 27;6:19873. doi: 10.1038/srep19873

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(A) Global map with the cruise track overlayed, showing measured daytime weighted mean depth of acoustic backscatter (WMD, m), as colour. (B) Global map with the cruise track overlayed, showing estimated migrating proportion (MP) as colour. Calculation of migration proportion was based on ratio between night and day acoustic backscatter at mesopelagic depths. (C) Global map with cruisetrack overlayed, showing estimated net vertical transport from the mesopelagic zone as colour. Net transport was estimated based on change in acoustic backscatter in paired day/night values.