Delayed onset of vocal recognition in Australian sea lion pups (Neophoca cinerea)

Benjamin J. Pitcher, Heidi Ahonen, Robert G. Harcourt, Isabelle Charrier

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

In pinnipeds, maternal care strategies and colony density may influence a species' individual recognition system. We examined the onset of vocal recognition of mothers by Australian sea lion pups (Neophoca cinerea). At 2 months of age, pups responded significantly more to the calls of their own mothers than alien female calls demonstrating a finely tuned recognition system. However, newborn pups did not respond differentially to the calls of their mother from alien female calls suggesting that vocal recognition had not yet developed or is not yet expressed. These findings are in stark contrast to other otariid species where pups learn their mother's voice before their first separation. Variance in colony density, pup movements, and natal site fidelity may have reduced selective pressures on call recognition in young sea lions, or alternatively, another sensory system may be used for recognition in the early stage of life.

Original languageEnglish
Pages (from-to)901-909
Number of pages9
JournalNaturwissenschaften
Volume96
Issue number8
DOIs
Publication statusPublished - Aug 2009

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