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2018 ; 8
(1
): 4366
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Infanticide in a mammal-eating killer whale population
#MMPMID29559642
Towers JR
; Hallé MJ
; Symonds HK
; Sutton GJ
; Morton AB
; Spong P
; Borrowman JP
; Ford JKB
Sci Rep
2018[Mar]; 8
(1
): 4366
PMID29559642
show ga
Infanticide can be an extreme result of sexual conflict that drives selection in
species in which it occurs. It is a rarely observed behaviour but some evidence
for its occurrence in cetaceans exists in three species of dolphin. Here we
describe observations of an adult male killer whale (Orcinus orca) and his
post-reproductive mother killing a neonate belonging to an unrelated female from
the same population in the North Pacific. This is the first account of
infanticide reported in killer whales and the only case committed jointly by an
adult male and his mother outside of humans. Consistent with findings in other
social mammals, we suggest that infanticide is a sexually selected behaviour in
killer whales that could provide subsequent mating opportunities for the
infanticidal male and thereby provide inclusive fitness benefits for his mother.
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