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Behavioural ontogeny of bearded seals Erignathus barbatus through the first year of life

Citation

Hamilton, CD and Lydersen, C and Fedak, MA and Freitas, C and Hindell, MA and Kovacs, KM, Behavioural ontogeny of bearded seals Erignathus barbatus through the first year of life, Marine Ecology - Progress Series, 627 pp. 179-194. ISSN 0171-8630 (2019) [Refereed Article]


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Copyright 2019 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3354/meps13072

Abstract

Pinniped pups face special ontogenetic challenges as they are born and receive maternal care on solid substrates (land or ice) but must transition to feeding aquatically following weaning. In this study, satellite relay data loggers were used to study behavioural ontogeny of bearded seal Erignathus barbatus pups (n = 13) through their first year in Svalbard, Norway. Pups occupied shallow, coastal habitats and were found in areas with intermediate ice concentrations (in seasons with sea ice: late-autumn/winter). Most pups showed exploratory movement patterns that peaked in the weeks following weaning; maximum home range size occurred at 31 to 60 d of age. Thereafter, home range size decreased with pups settling into areas along the coast. Time spent diving, dive duration, dive depth and time at the bottom of dives increased during the first weeks of independence, stabilizing when pups were ~50 d old. Dive depth subsequently decreased to depths comparable to adult bearded seals (by the time pups were ~175 d old). Record maximum dive depth (368 m) and duration (16.5 min) were performed by pups that were 66 and 224 d old, respectively. Time spent hauled out decreased after weaning, with pups hauling out only sporadically after they were 75 d old. Bearded seal pups seem to be physiologically and behaviourally well developed by the time they are 2 mo old. Pups did not display the individually specialized diving behaviour seen in adults, which suggests that they continue to fine-tune their aquatic and other life-skills well past the end of the first year of life.

Item Details

Item Type:Refereed Article
Keywords:bearded seal, ecology, diving development, pinniped development, phocid seals, Svalbard
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological Oceanography
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
UTAS Author:Hindell, MA (Professor Mark Hindell)
ID Code:136826
Year Published:2019
Web of Science® Times Cited:1
Deposited By:Ecology and Biodiversity
Deposited On:2020-01-20
Last Modified:2020-05-25
Downloads:0

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