University Of Tasmania

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Ontogenetic niche partitioning in southern elephant seals from Argentine Patagonia

journal contribution
posted on 2023-05-20, 19:59 authored by Campagna, J, Lewis, MN, Carman, VG, Campagna, C, Guinet, C, Johnson, M, Davis, RW, Rodriguez, DH, Mark HindellMark Hindell

Elephant seals, Mirounga spp., are highly dimorphic, having different energetic requirements according to age and sex, and foraging in various ecological and oceanographic contexts. Resource partitioning has been shown for the sub‐Antarctic populations of southern elephant seals, M. leonina, where colonies are surrounded by narrow shelves that deepen abruptly. In contrast, seals from Península Valdés (Argentina), in the northernmost extent of the breeding range, face an extended, shallow, temperate, and productive continental shelf. We integrated tracking data from 98 animals (juveniles and adults, males and females) gathered over more than two decades, and found that although all available habitats were used, individuals segregated by age and sex. Juvenile males favored shelf habitats, whereas subadult and adult males also used the shelf break. Juvenile females preferred the shelf and the more distant Argentine Basin used by postbreeding and postmolt adult females. Males showed the highest proportion of area‐restricted search locations, suggesting more spatially concentrated feeding activity, and likely reflecting a preference for foraging habitat and prey. Our results are consistent with those from other populations, implying that elephant seals show remarkable similarities in habitat use by age and sex classes, despite broad differences in the offshore habitats between sub‐Antarctic and temperate ecosystems.


European Commission


Publication title

Marine Mammal Science








Institute for Marine and Antarctic Studies


Soc Marine Mammalogy

Place of publication

1041 New Hampshire St, Lawrence, USA, Ks, 66044

Rights statement

© 2020 Society for Marine Mammalogy

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  • Restricted

Socio-economic Objectives

Assessment and management of coastal and estuarine ecosystems; Antarctic and Southern Ocean ice dynamics