Behavioral Ecology and Sociobiology

, Volume 70, Issue 1, pp 189–198 | Cite as

Sexual segregation when foraging in an extremely social killer whale population

  • Amber Beerman
  • Erin Ashe
  • Katharine Preedy
  • Rob Williams
Original Article

Abstract

Resident, fish-eating killer whales in the northeastern Pacific Ocean live in multi-generational matrilines containing both sexes. The degree of maternal fidelity and natal philopatry in this killer whale society is extreme even by the standards of lions, elephants or any highly social mammal. Benefits of group living include cooperative foraging and alloparental care, but few studies have explored how killer whales avoid within-group competition for prey. This study measured focal animal behaviour from one population in its legally designated critical habitat. Adult males and females overlapped spatially whilst resting, travelling and socialising, but during feeding bouts, females foraged nearshore in shallower waters, whilst adult males distributed foraging effort throughout the study area, with no statistically significant depth preference. We postulate that sex-biased dispersal in foraging ecology reflects physiological capacity for deeper diving in males than females, which may be either a driver or consequence of extreme sexual dimorphism in the species; alternative interpretations exist. Killer whales appear to be a cosmopolitan species complex including populations that range widely in body size and diet. Our physiological limitation theory could be tested with other ecotypes. For the northern resident killer whale population we studied, we postulate that our finding may indicate a mechanism to avoid or reduce competition for food within the family unit whilst ensuring group cohesion. Investigating sex differences in foraging habitat informs area-based management and conservation of this threatened population, but studies on other ecotypes are needed to improve our understanding of the evolution of sociality in this species.

Keywords

Foraging ecology Killer whale Marine mammal Niche partitioning Sexual segregation Intra-specific competition 

Supplementary material

265_2015_2038_MOESM1_ESM.docx (22 kb)
ESM 1Supplementary material. (DOCX 22 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Amber Beerman
    • 1
  • Erin Ashe
    • 1
  • Katharine Preedy
    • 2
  • Rob Williams
    • 1
  1. 1.Sea Mammal Research Unit, Scottish Oceans InstituteUniversity of St. AndrewsFifeUK
  2. 2.Biomathematics and Statistics Scotland, Dundee UnitDundeeUK

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