Direct At-Sea Observations of Elephant Seals ( spp.) to Help Interpret Digital Bio-logging Data

van den Hoff, John; Thalmann, Sam

Direct At-Sea Observations of Elephant Seals (Mirounga spp.) to Help Interpret Digital Bio-logging Data

John van den Hoff^{1, *}, Sam Thalmann²

¹ Australian Antarctic Division, 203 Channel Highway, Kingston, 7050, Tasmania, Australia

² Department of Primary Industries, Parks, Water and Environment, GPO Box 44, Hobart, 7001, Tasmania, Australia

Article Information

Identifiers and Pagination:

Year: 2020
Volume: 8
First Page: 1
Last Page: 5
Publisher Id: TOBIOJ-8-1
DOI: 10.2174/1874196702008010001

Article History:

Received Date: 13/2/2020
Revision Received Date: 13/7/2020
Acceptance Date: 26/7/2020
Electronic publication date: 25/09/2020
Collection year: 2020

© 2020 John & Sam

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

^* Address correspondence to this author at: Australian Antarctic Division, 203 Channel Highway, Kingston, 7050, Tasmania, Australia; Email: john_van@aad.gov.au

Background:

A key short-fall with animal-borne bio-logging instruments, which collect digital time-series data regarding the foraging behaviours of cryptic marine mammal species, is validating those data against in situ behaviours.

Objective:

To collate direct observations of elephant seal feeding behaviour to help interpret foraging behaviours inferred from Time-Depth Recorder (TDR) data.

Methods:

Direct observations of elephant seal foraging behaviour were collated from the published literature using a search of the world-wide-web. Those observations were supplemented with an unpublished record.

Results:

Two deep-sea video recordings and six surface sightings of elephant seals ingesting prey were collated. Each observation either supported or suggested an alternative to behaviours derived from digital time-depth profiles. The tendency for elephant seals to surface following the capture of large prey suggests precipitous drops in stomach temperature at the sea-surface, which have been recorded and interpreted as drinking events, more likely represent the ingestion of large prey items.

Conclusion:

Direct observations of marine mammal foraging behaviours are rare, yet they provide a means to continuously evaluate and interpret outcomes of bio-logging instruments.

Keywords: Bio-logging, Foraging behaviour, Marine mammal, Stomach temperature, Time-depth recorder, Elephant seals (Mirounga spp.).

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Direct At-Sea Observations of Elephant Seals (Mirounga spp.) to Help Interpret Digital Bio-logging Data

Article Information

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Abstract

Background:

Objective:

Methods:

Results:

Conclusion:

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