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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Loss of buoyancy control in the copepod Calanus finmarchicus
Author(s): Cohen, Jonathan H
Last, Kim S
Waldie, Jack
Pond, David W
Keywords: salinity
lipid phase transition
depth regulation
Issue Date: 1-Sep-2019
Citation: Cohen JH, Last KS, Waldie J & Pond DW (2019) Loss of buoyancy control in the copepod Calanus finmarchicus. Journal of Plankton Research, 41 (5), pp. 787-790.
Abstract: A mechanism is demonstrated that could explain large-scale aggregations of lipid-rich copepods in the surface waters of marine environments. Laboratory experiments establish that changes in salinity and temperature induce lipid-mediated buoyancy instability that entrains copepods in surface waters. Reduced hydrostatic pressure associated with forced ascent of copepods at fjordic sills, shelf breaks and seamounts would also reduce the density of the lipid reserves, forcing copepods and particularly those in diapause to the surface. We propose that salinity, temperature and hydrodynamics of the physical environment, in conjunction with the biophysical properties of lipids, explain periodic high abundances of lipid-rich copepods in surface waters.
DOI Link: 10.1093/plankt/fbz036
Rights: © The Author(s) 2019. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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