Show simple item record

dc.contributor.authorOsterrieder, Sylvia
dc.contributor.authorParnum, Iain
dc.contributor.authorSalgado Kent, Chandra
dc.contributor.authorRobinson, R.
dc.identifier.citationOsterrieder, S. and Parnum, I. and Kent, C. and Robinson, R. 2017. Difficulties identifying Australian sea lions (Neophoca cinerea) in the wild using whisker spot patterns. Australian Mammalogy. 39 (1): pp. 56-71.

Individual identification is a beneficial tool in behavioural and ecological research. In mark-recapture studies, for example, it can improve abundance, residency and site fidelity estimates. Two non-invasive, photo-identification approaches, using whisker spot patterns, were tested to identify wild individual Australian sea lions (Neophoca cinerea). The Chamfer distance transform algorithm has shown promising results when applied to captive individuals. An alternative matching method using row/column locations of whisker spots, previously applied to lions (Panthera leo) was also tested. Resighting wild N. cinerea in this study proved unfeasible with both methods. Excessive variation between photographs of the same individual was found when applying the Chamfer distance transform, and similarity between photograph-pairs appeared to decrease with increasing time between photographs. Insufficient variation among N. cinerea row/column pattern was detected to successfully discriminate among individuals, averaging 39 mystacial spots (range 30-46, n=20) in seven rows and 9-10 columns. Additionally, different observers marking the same photographs introduced considerable variation. Colour difference (red, green and blue colour levels) between the whisker spots and surrounding fur affected marking spot locations significantly, increasing uncertainty when contrast decreased. While other pattern-matching algorithms may improve performance, accurate identification of spot locations was the current limitation. © 2017 Australian Mammal Society.

dc.publisherCSIRO Publishing
dc.titleDifficulties identifying Australian sea lions (Neophoca cinerea) in the wild using whisker spot patterns
dc.typeJournal Article
dcterms.source.titleAustralian Mammalogy
curtin.departmentCentre for Marine Science and Technology
curtin.accessStatusFulltext not available

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record