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Dispersal and dispersion of southern elephant seals in the Kerguelen province, Southern Ocean

Published online by Cambridge University Press:  20 July 2011

W. Chris Oosthuizen ,
Marthán N. Bester ,
Cheryl A. Tosh ,
Christophe Guinet ,
Dominique Besson  and
P.J. Nico de Bruyn
W. Chris Oosthuizen*
Affiliation:
Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria 00028, South Africa
Marthán N. Bester
Affiliation:
Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria 00028, South Africa
Cheryl A. Tosh
Affiliation:
Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria 00028, South Africa
Christophe Guinet
Affiliation:
Centre d'Etudes Biologiques de Chize, Centre National de la Recherche Scientifique, F-79360 Villiers en Bois, France
Dominique Besson
Affiliation:
Centre d'Etudes Biologiques de Chize, Centre National de la Recherche Scientifique, F-79360 Villiers en Bois, France
P.J. Nico de Bruyn
Affiliation:
Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria 00028, South Africa
*
[email protected]
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Abstract

Southern elephant seals Mirounga leonina within the Kerguelen province disperse between Marion Island (MI), Iles Crozet (IC) and Iles Kerguelen (IK) despite the high site fidelity characteristic of this species. From 1987–2002, 199 IC individuals, or 11.63% of the tagged population there, were resighted at MI. Resights of IC seals at MI peaked during the juvenile moult and seals aged 0–2 represent 66% of all resights made. Equal numbers of male and female seals (all age classes) were dispersing. Dispersing breeding females (n = 22, on 33 occasions) outnumbered dispersing breeding males (n = 6, on 16 occasions), after initially emigrating from IC to MI as juvenile seals (natal dispersal). Greater male-mediated gene flow was ultimately attained due to the polygynous mating system and some extremely successful males. Of 132 seals fitted with satellite-relay data loggers at MI, six hauled out at IC and three at IK. Two of the seals which migrated to IC were born at MI; all others were unmarked males likely to be native to IC or IK. Dispersal should ideally be considered when assessing vital rates for southern Indian Ocean elephant seal populations.

Keywords

gene flowIles CrozetIles Kerguelenmark-resightingmetapopulationmigrationMrounga leoninaMarion Island
Type
Biological Sciences
Information
Antarctic Science , Volume 23 , Issue 6 , 22 November 2011 , pp. 567 - 577
Copyright
Copyright © Antarctic Science Ltd 2011

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