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dc.contributor.authorSteinfurth, A
dc.contributor.authorBooth, JM
dc.contributor.authorWhite, J
dc.contributor.authorBond, AL
dc.contributor.authorMcQuaid, CD
dc.identifier.citationSteinfurth A, Booth JM, White J, Bond AL, McQuaid CD (2019) Sexual and geographic dimorphism in northern rockhopper penguins breeding in the South Atlantic Ocean. Endang Species Res 39:293-302.
dc.description.abstractThe Endangered northern rockhopper penguin Eudyptes moseleyi, like all penguins, is monomorphic, making sex determination of individuals in the field challenging. We examined the degree of sexual size dimorphism of adult birds across the species’ breeding range in the Atlantic Ocean and developed discriminant functions (DF) to predict individuals’ sex using morphometric measurements. We found significant site-specific differences in both bill length and bill depth, with males being the larger sex on each island. Across all islands, bill length contributed 78% to dissimilarity between sexes. Penguins on Gough Island had significantly longer bills, whilst those from Tristan da Cunha had the deepest. Island-specific DFs correctly classified 82-94% of individuals, and all functions performed significantly better than chance. The model for Nightingale Island correctly classified the greatest proportion of individuals (94-95%), while that for Tristan da Cunha performed the poorest (80-82%). A discriminant function derived from all sites accurately sexed 86-88% of northern rockhopper penguins achieving similar accuracy to island-specific functions. While molecular techniques conclusively determine an individual’s sex, morphometric measurements can provide a reliable estimate with close to 90% accuracy using a method that is less invasive and requires little technical expertise. Sexing is an important tool for meaningful interpretation of ecological data. Consideration of sex-specific differences in future studies will aid investigation of a potential sex-dependent vulnerability in this Endangered species.en_US
dc.publisherInter-Research Science Centeren_US
dc.titleSexual and geographic dimorphism in northern rockhopper penguins breeding in the South Atlantic Oceanen_US
dc.typeJournal Articleen_US
dc.identifier.journalEndangered Species Researchen_US
dc.identifier.startpage293 - 302en_US
pubs.organisational-group/Natural History Museum
pubs.organisational-group/Natural History Museum/Science Group
pubs.organisational-group/Natural History Museum/Science Group/Functional groups
pubs.organisational-group/Natural History Museum/Science Group/Functional groups/Collections
pubs.organisational-group/Natural History Museum/Science Group/Functional groups/Collections/LS Collections
pubs.organisational-group/Natural History Museum/Science Group/Life Sciences
pubs.organisational-group/Natural History Museum/Science Group/Life Sciences/Vertebrates
pubs.organisational-group/Natural History Museum/Science Group/Life Sciences/Vertebrates/Vertebrates – Collections
dc.embargoNot knownen_US
elements.import.authorSteinfurth, Aen_US
elements.import.authorBooth, JMen_US
elements.import.authorWhite, Jen_US
elements.import.authorBond, ALen_US
elements.import.authorMcQuaid, CDen_US
dc.description.nhm© The authors 2019. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are unrestricted. Authors and original publication must be credited. The attached file is the published pdf.en_US
dc.subject.nhmNorthern rockhopper penguinen_US
dc.subject.nhmEudyptes moseleyien_US
dc.subject.nhmSexual dimorphismen_US
dc.subject.nhmDiscriminant function analysisen_US
dc.subject.nhmMorphological sexingen_US

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