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Foraging patterns of Antarctic minke whales in McMurdo Sound, Ross Sea

Published online by Cambridge University Press:  01 June 2020

David G. Ainley*
Affiliation:
HT Harvey and Associates, 983 University Ave, Los Gatos, CA95032, USA
Trevor W. Joyce
Affiliation:
Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, 8901 La Jolla Shores Dr., La Jolla, CA92037, USA National Academies of Science, Engineering, and Medicine, 500 Fifth Street, Washington, DC, 20001, USA
Ben Saenz
Affiliation:
Resource Management Associates, 756 Picasso Ave G, Davis, CA95618, USA
Robert L. Pitman
Affiliation:
Antarctic Ecosystem Research Division, Southwest Fisheries Science Center, National Marine Fisheries Service, 8901 La Jolla Shores Dr., La Jolla, CA92037, USA Marine Mammal Institute, Oregon State University, 2030 SE Marine Science Drive, Newport, OR97365, USA
John W. Durban
Affiliation:
Southhall Environmental Associates, 9099 Soquel Drive, Aptos, CA, 95003, USA
Grant Ballard
Affiliation:
Point Blue Conservation Science, 3820 Cypress Drive, Suite #11, Petaluma, CA94954, USA
Kendra Daly
Affiliation:
University of South Florida, 140 7th Ave S, St Petersburg, FL33701, USA
Stacy Kim
Affiliation:
Moss Landing Marine Labs, 8272 Moss Landing Rd, Moss Landing, CA95039, USA

Abstract

Evidence indicates that Antarctic minke whales (AMWs) in the Ross Sea affect the foraging behaviour, especially diet, of sympatric Adélie penguins (ADPEs) by, we hypothesize, influencing the availability of prey they have in common, mainly crystal krill. To further investigate this interaction, we undertook a study in McMurdo Sound during 2012–2013 and 2014–2015 using telemetry and biologging of whales and penguins, shore-based observations and quantification of the preyscape. The 3D distribution and density of prey were assessed using a remotely operated vehicle deployed along and to the interior of the fast-ice edge where AMWs and ADPEs focused their foraging. Acoustic surveys of prey and foraging behaviour of predators indicate that prey remained abundant under the fast ice, becoming successively available to air-breathing predators only as the fast ice retreated. Over both seasons, the ADPE diet included less krill and more Antarctic silverfish once AMWs became abundant, but the penguins' foraging behaviour (i.e. time spent foraging, dive depth, distance from colony) did not change. In addition, over time, krill abundance decreased in the upper water column near the ice edge, consistent with the hypothesis (and previously gathered information) that AMW and ADPE foraging contributed to an alteration of prey availability.

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2020

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