Contribution to the Special Issue: 'Commemorating 100 years since Hjort's 1914 treatise on fluctuations in the great fisheries of northern Europe' Quo Vadimus Marine ecosystem acoustics (MEA): quantifying processes in the sea at the spatio-temporal scales on which they occur

Olav Rune Godo1*, Nils Olav Handegard1, Howard I. Browman1, Gavin J. Macaulay1, Stein Kaartvedt2, Jarl Giske3, Egil Ona1, Geir Huse1, and Espen Johnsen1 Institute of Marine Research, PO Box 1870 Nordnes, 5817 Bergen, Norway King Abdullah University of Science and Technology, Thuwal, Saudi Arabia University of Bergen, PO Box 7800, 5020 Bergen, Norway *Corresponding author: tel: +47 55238500; fax: +47 55236830; e-mail: olavrune@imr.no