Diel vertical migration of Antarctic krill (Euphausia superba) is flexible during advection across the Scotia Sea

Cresswell, Katherine A.; Tarling, Geraint A. ORCID: https://orcid.org/0000-0002-3753-5899; Thorpe, Sally E. ORCID: https://orcid.org/0000-0002-5193-6955; Burrows, Michael T.; Wiedenmann, John; Mangel, Marc. 2009 Diel vertical migration of Antarctic krill (Euphausia superba) is flexible during advection across the Scotia Sea. Journal of Plankton Research, 31 (10). 1265-1281. https://doi.org/10.1093/plankt/fbp062

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Abstract/Summary

We model a summer snapshot of the behavior of Antarctic krill (Euphausia superba) during advection across the Scotia Sea. Individual krill respond to a changing landscape of predation risk and food availability by migrating vertically in the column and choosing an average distance to their nearest neighbor (swarm density). We determine the optimal behavior of 30, 40 and 50 mm krill using a state-dependent life history model where individuals move along 30-day segments of hypothetical journey tracks in three different regions of the Scotia Sea, with the tracks extracted from a combination of circulation models and surface drifter data. Food availability is based on satellite data for surface Chl and with additional heterotrophic and detritus food components, and mortality is parameterized with respect to distance from shore, daylight and krill swarming-behavior. We predict that proximity to predator colonies has a distinct effect on behavior, particularly on depth choice when food-availability is low. Observations made during an acoustic survey of the region found swarms to be deeper at the Antarctic Peninsula compared with South Georgia, in line with model pedictions. Our pedictions are also consistent with observations that swarm density, changes little on a logarithmic scale across the region. We show that being able to change behavior on short time scales has distinct advantages to krill.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1093/plankt/fbp062
Programmes:	BAS Programmes > Global Science in the Antarctic Context (2005-2009) > DISCOVERY 2010 - Integrating Southern Ocean Ecosystems into the Earth System
ISSN:	0142-7873
NORA Subject Terms:	Marine Sciences Zoology Ecology and Environment
Date made live:	20 Oct 2010 11:21 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/10746

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